570
FPUS53 KLSX 051723
ZFPLSX

Zone Forecasts
National Weather Service Saint Louis MO
1223 PM CDT Sat Sep 5 2026

ILZ100-101-MOZ061-063-064-060100-
Madison IL-Saint Clair IL-Saint Charles MO-Saint Louis MO-
Saint Louis City MO-
Including the cities of Alton, Edwardsville, Belleville, Cahokia,
Saint Charles, and Saint Louis
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the
upper 90s. Northwest winds 5 to 10 mph. Heat index values up to
109.
.TONIGHT...Partly cloudy. Humid with lows in the lower 70s.
Northeast winds around 5 mph. Heat index values up to 106 early
in the evening.
.SUNDAY...Mostly sunny. Highs in the lower 90s. Northeast winds
5 to 10 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the mid 60s. East winds
5 to 10 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the mid
60s. Highs in the mid 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the mid
70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT...Mostly clear in the evening, then becoming
partly cloudy. A slight chance of thunderstorms. A slight chance
of showers in the evening, then a chance of showers after
midnight. Lows in the lower 70s. Chance of rain 50 percent. Heat
index values up to 100 early in the evening.
.THURSDAY...Mostly sunny with a slight chance of thunderstorms. A
chance of showers, mainly in the morning. Highs around 90. Chance
of rain 50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Mostly sunny with a slight chance of showers. A slight
chance of thunderstorms in the afternoon. Highs in the upper 80s.
Chance of rain 20 percent.

$$

MOZ042-049-050-060100-
Audrain MO-Osage MO-Callaway MO-
Including the cities of Mexico and Fulton
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot with highs in the upper 90s.
Northwest winds around 5 mph. Heat index values up to 105.
.TONIGHT...Partly cloudy in the evening, then clearing. Lows in
the lower 70s. Northeast winds around 5 mph. Heat index values up
to 102 early in the evening.
.SUNDAY...Mostly sunny. Highs in the lower 90s. East winds 5 to
10 mph.
.SUNDAY NIGHT...Partly cloudy in the evening, then clearing. Lows
in the mid 60s. East winds 5 to 10 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. Southeast winds 5 to
10 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the mid
60s. Highs in the mid 90s. Heat index values up to 100.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the mid
70s. Highs in the mid 90s. Heat index values up to 105.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. A chance of
showers with a slight chance of thunderstorms. Lows in the upper
60s. Highs in the upper 80s. Chance of rain 50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Mostly sunny. A slight chance of showers and
thunderstorms in the morning. Highs in the upper 80s. Chance of
rain 20 percent.

$$

MOZ041-047-048-060100-
Boone MO-Moniteau MO-Cole MO-
Including the cities of Columbia and Jefferson City
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot with highs in the upper 90s.
Northwest winds around 5 mph. Heat index values up to 107.
.TONIGHT...Partly cloudy in the evening, then clearing. Lows in
the lower 70s. Northeast winds around 5 mph. Heat index values up
to 105 early in the evening.
.SUNDAY...Sunny, hot with highs in the mid 90s. East winds 5 to
10 mph. Heat index values up to 104.
.SUNDAY NIGHT...Partly cloudy in the evening, then clearing. Lows
in the upper 60s. East winds 5 to 10 mph.
.LABOR DAY...Sunny. Highs in the lower 90s. Southeast winds
around 5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the upper
60s. Highs around 99. Heat index values up to 105.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the mid
70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. A chance of
showers with a slight chance of thunderstorms. Lows around 70.
Highs around 90. Chance of rain 50 percent. Heat index values up
to 100.
.THURSDAY NIGHT...Mostly clear. A chance of showers with a slight
chance of thunderstorms after midnight. Lows in the mid 60s.
Chance of rain 30 percent.
.FRIDAY...Mostly sunny. A slight chance of showers and
thunderstorms in the morning. Highs in the upper 80s. Chance of
rain 20 percent.

$$

ILZ095>097-MOZ018-019-026-027-034>036-060100-
Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO-
Monroe MO-Ralls MO-Pike MO-
Including the cities of Quincy, Mount Sterling, Pittsfield,
Hannibal, and Bowling Green
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the mid
90s. North winds around 5 mph. Heat index values up to 106.
.TONIGHT...Mostly clear in the evening, then becoming partly
cloudy. Humid with lows in the upper 60s. Northeast winds around
5 mph. Heat index values up to 103 early in the evening.
.SUNDAY...Mostly sunny. Highs around 90. East winds 5 to 10 mph.
.SUNDAY NIGHT...Partly cloudy in the evening, then becoming
mostly clear. Lows in the mid 60s. East winds 5 to 10 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. Southeast winds 5 to
10 mph.
.MONDAY NIGHT...Mostly clear. Lows in the upper 60s.
.TUESDAY...Mostly sunny. Hot with highs in the mid 90s.
.TUESDAY NIGHT...Mostly clear. Lows in the mid 70s.
.WEDNESDAY...Mostly sunny with a slight chance of showers and
thunderstorms. Hot with highs in the mid 90s. Chance of rain
20 percent.
.WEDNESDAY NIGHT...Partly cloudy with a chance of showers with a
slight chance of thunderstorms. Lows in the upper 60s. Chance of
rain 50 percent.
.THURSDAY...Mostly sunny. A chance of showers in the morning.
Highs in the mid 80s. Chance of rain 50 percent.
.THURSDAY NIGHT...Mostly clear. A slight chance of showers and
thunderstorms after midnight. Lows in the mid 60s. Chance of rain
20 percent.
.FRIDAY...Mostly sunny. A chance of showers in the morning. Highs
in the upper 80s. Chance of rain 30 percent.

$$

ILZ069-070-074-060100-
Clinton IL-Marion IL-Washington IL-
Including the cities of Centralia and Salem
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the
upper 90s. Northwest winds 5 to 10 mph. Heat index values up to
109.
.TONIGHT...Partly cloudy in the evening, then becoming mostly
clear. Humid with lows around 70. Northeast winds around 5 mph.
Heat index values up to 105 early in the evening.
.SUNDAY...Sunny. Highs around 90. Northeast winds 5 to 10 mph.
.SUNDAY NIGHT...Mostly clear in the evening, then becoming partly
cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the mid
60s. Highs in the mid 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs around 100. Heat index values up to 105.
.WEDNESDAY NIGHT...Mostly clear with a slight chance of
thunderstorms. A slight chance of showers in the evening, then a
chance of showers after midnight. Lows around 70. Chance of rain
40 percent. Heat index values up to 100 early in the evening.
.THURSDAY...Mostly sunny. A chance of showers in the morning,
then a slight chance of showers and thunderstorms in the
afternoon. Not as warm with highs around 90. Chance of rain
50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then becoming
mostly clear. Lows in the mid 60s.
.FRIDAY...Sunny with a 20 percent chance of showers. Highs in the
upper 80s.

$$

MOZ074-084-085-099-060100-
Saint Francois MO-Iron MO-Madison MO-Reynolds MO-
Including the city of Farmington
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny with isolated showers and thunderstorms.
Hot. Near steady temperature in the mid 90s. Northwest winds
around 5 mph. Chance of rain 20 percent. Heat index values up to
105.
.TONIGHT...Partly cloudy with isolated showers and thunderstorms
in the evening, then mostly clear after midnight. Lows in the
lower 70s. Light and variable winds, becoming north around 5 mph
after midnight. Chance of rain 20 percent. Heat index values up
to 101 early in the evening.
.SUNDAY...Sunny. Highs in the lower 90s. Northeast winds 5 to
10 mph.
.SUNDAY NIGHT...Partly cloudy in the evening, then becoming
mostly clear. Lows in the lower 60s. Northeast winds around
5 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the lower 60s.
Highs in the lower 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows around 70.
Highs in the mid 90s. Heat index values up to 105.
.WEDNESDAY NIGHT...Mostly clear in the evening, then partly
cloudy with a slight chance of showers after midnight. Lows in
the upper 60s. Chance of rain 20 percent.
.THURSDAY...Mostly sunny with a chance of showers. A slight
chance of thunderstorms in the afternoon. Highs around 90. Chance
of rain 50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Sunny with a slight chance of showers and
thunderstorms. Highs in the upper 80s. Chance of rain 20 percent.

$$

MOZ051-052-060-060100-
Montgomery MO-Lincoln MO-Warren MO-
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the
upper 90s. Northwest winds around 5 mph. Heat index values up to
107.
.TONIGHT...Partly cloudy in the evening, then becoming mostly
clear. Humid with lows around 70. Northeast winds around 5 mph.
Heat index values up to 104 early in the evening.
.SUNDAY...Mostly sunny. Highs around 90. East winds around 5 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the mid 60s. East winds
around 5 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. Southeast winds
around 5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the mid
60s. Highs in the mid 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. A chance of
showers with a slight chance of thunderstorms. Lows in the upper
60s. Highs in the upper 80s. Chance of rain 50 percent. Heat
index values up to 100.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Mostly sunny. A slight chance of showers in the
morning. Highs in the upper 80s. Chance of rain 20 percent.

$$

ILZ058-059-098-099-060100-
Greene IL-Macoupin IL-Calhoun IL-Jersey IL-
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the
upper 90s. North winds around 5 mph. Heat index values up to 106.
.TONIGHT...Mostly clear in the evening, then becoming partly
cloudy. Lows in the upper 60s. Northeast winds around 5 mph. Heat
index values up to 104 early in the evening.
.SUNDAY...Mostly sunny. Not as warm with highs in the upper 80s.
Northeast winds 5 to 10 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the lower 60s. East winds
5 to 10 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the lower
60s. Highs in the mid 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. A chance of
showers with a slight chance of thunderstorms. Lows in the upper
60s. Highs in the upper 80s. Chance of rain 50 percent.
.THURSDAY NIGHT...Mostly clear. A slight chance of showers and
thunderstorms after midnight. Lows in the lower 60s. Chance of
rain 20 percent.
.FRIDAY...Mostly sunny with a slight chance of showers. A slight
chance of thunderstorms in the afternoon. Highs in the upper 80s.
Chance of rain 20 percent.

$$

ILZ060-064-065-060100-
Montgomery IL-Bond IL-Fayette IL-
Including the cities of Litchfield and Vandalia
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the mid
90s. Northwest winds around 5 mph. Heat index values up to 106.
.TONIGHT...Mostly clear in the evening, then becoming partly
cloudy. Lows in the upper 60s. Northeast winds around 5 mph. Heat
index values up to 102 early in the evening.
.SUNDAY...Sunny. Not as warm with highs in the upper 80s.
Northeast winds 5 to 10 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the lower 60s. Northeast
winds 5 to 10 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the lower
60s. Highs in the mid 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT...Mostly clear in the evening, then becoming
partly cloudy. A chance of showers with a slight chance of
thunderstorms. Lows in the upper 60s. Chance of rain 40 percent.
.THURSDAY...Mostly sunny. A chance of showers with a slight
chance of thunderstorms in the morning, then a slight chance of
showers in the afternoon. Not as warm with highs in the upper
80s. Chance of rain 50 percent.
.THURSDAY NIGHT...Mostly clear. Lows in the lower 60s.
.FRIDAY...Sunny with a 20 percent chance of showers. Highs in the
upper 80s.

$$

ILZ079-MOZ075-060100-
Randolph IL-Sainte Genevieve MO-
Including the cities of Chester and Sparta
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny with isolated showers and thunderstorms.
Hot. Near steady temperature in the upper 90s. North winds around
5 mph. Chance of rain 20 percent. Heat index values up to 106.
.TONIGHT...Partly cloudy. Isolated showers and thunderstorms in
the evening. Humid with lows in the lower 70s. North winds around
5 mph. Chance of rain 20 percent. Heat index values up to
104 early in the evening.
.SUNDAY...Sunny. Highs around 90. Northeast winds 5 to 10 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the lower 60s. Northeast
winds around 5 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s.
Highs in the mid 90s. Heat index values up to 100.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT...Mostly clear in the evening, then partly
cloudy with a chance of showers after midnight. Lows around 70.
Chance of rain 40 percent. Heat index values up to 100 early in
the evening.
.THURSDAY...Mostly sunny with a chance of showers. A slight
chance of thunderstorms in the afternoon. Highs around 90. Chance
of rain 50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Sunny. A slight chance of showers in the morning. Highs
in the upper 80s. Chance of rain 20 percent.

$$

MOZ059-062-072-073-060100-
Gasconade MO-Franklin MO-Crawford MO-Washington MO-
Including the cities of Washington, Union, and Sullivan
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the
upper 90s. Northwest winds around 5 mph. Heat index values up to
106.
.TONIGHT...Partly cloudy in the evening, then clearing. Lows in
the lower 70s. Northeast winds around 5 mph. Heat index values up
to 103 early in the evening.
.SUNDAY...Sunny. Highs in the lower 90s. Northeast winds around
5 mph.
.SUNDAY NIGHT...Partly cloudy in the evening, then becoming
mostly clear. Lows in the lower 60s. East winds around 5 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the mid
60s. Highs in the mid 90s.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs in the upper 90s. Heat index values up to 105.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. A chance of
showers with a slight chance of thunderstorms. Lows in the upper
60s. Highs in the upper 80s. Chance of rain 50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Mostly sunny. A slight chance of showers in the
morning. Highs in the upper 80s. Chance of rain 20 percent.

$$

ILZ102-MOZ065-060100-
Monroe IL-Jefferson MO-
1223 PM CDT Sat Sep 5 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.THIS AFTERNOON...Sunny, hot. Near steady temperature in the
upper 90s. Northwest winds around 5 mph. Heat index values up to
108.
.TONIGHT...Partly cloudy in the evening, then clearing. Humid
with lows in the lower 70s. Northeast winds around 5 mph. Heat
index values up to 104 early in the evening.
.SUNDAY...Mostly sunny. Highs in the lower 90s. Northeast winds
around 5 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the lower 60s. East winds
around 5 mph.
.LABOR DAY...Sunny. Highs in the upper 80s. East winds around
5 mph.
.MONDAY NIGHT AND TUESDAY...Mostly clear. Hot. Lows in the lower
60s. Highs in the mid 90s. Heat index values up to 100.
.TUESDAY NIGHT AND WEDNESDAY...Mostly clear. Hot. Lows in the
lower 70s. Highs in the upper 90s. Heat index values up to 110.
.WEDNESDAY NIGHT...Mostly clear in the evening, then partly
cloudy with a chance of showers with a slight chance of
thunderstorms after midnight. Lows around 70. Chance of rain
40 percent. Heat index values up to 100 early in the evening.
.THURSDAY...Mostly sunny. A chance of showers in the morning,
then a slight chance of showers and thunderstorms in the
afternoon. Highs around 90. Chance of rain 50 percent.
.THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear
with a slight chance of showers and thunderstorms after midnight.
Lows in the mid 60s. Chance of rain 20 percent.
.FRIDAY...Mostly sunny. A slight chance of showers in the
morning. Highs in the upper 80s. Chance of rain 20 percent.

$$