Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Heat Advisory until September 19, 08:00 PM CDT

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

82°F

28°C

Humidity	69%
Wind Speed	E 9 mph
Barometer	30.01 in (1014.7 mb)
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Heat Index	86°F (30°C)
Last update	18 Sep 11:51 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

2 Miles SSW Saint Louis MO

Heat Advisory September 19, 12:47am until September 19, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory September 19, 12:47am until September 19, 08:00pm
NOW until 8:00pm Sat
Heat Advisory
Overnight
Low: 75 °F
Partly Cloudy
Saturday
High: 98 °F
Hot
Saturday Night
Low: 75 °F
Decreasing
Clouds
Sunday
High: 94 °F
Slight Chance
Showers then
Slight Chance
T-storms
Sunday Night
Low: 69 °F
Showers
Likely
Monday
High: 81 °F
Showers
Likely
Monday Night
Low: 62 °F
Slight Chance
T-storms
Tuesday
High: 72 °F
Mostly Cloudy

Detailed Forecast

Overnight

Partly cloudy, with a low around 75. South wind 3 to 6 mph.

Saturday

Increasing clouds and hot, with a high near 98. Southwest wind 3 to 7 mph.

Saturday Night

Mostly cloudy, then gradually becoming mostly clear, with a low around 75. South wind 3 to 5 mph.

Sunday

A slight chance of showers, with thunderstorms also possible after 4pm. Mostly sunny, with a high near 94. West wind 3 to 6 mph. Chance of precipitation is 20%.

Sunday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. North wind 5 to 7 mph. Chance of precipitation is 60%.

Monday

Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.

Monday Night

A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 20%.

Tuesday

Mostly cloudy, with a high near 72.

Tuesday Night

Mostly cloudy, with a low around 57.

Wednesday

Mostly sunny, with a high near 75.

Wednesday Night

Partly cloudy, with a low around 57.