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

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

95°F

35°C

Humidity	51%
Wind Speed	E 5 mph
Barometer	30.08 in (1018.1 mb)
Dewpoint	74°F (23°C)
Visibility	10.00 mi
Heat Index	106°F (41°C)
Last update	18 Sep 1:53 pm CDT

More Information:

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

Extended Forecast for

Swansea IL

Heat Advisory September 18, 02:24pm until September 19, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory September 18, 02:24pm until September 19, 08:00pm
NOW until 8:00pm Sat
Heat Advisory
This Afternoon
High: 98 °F
Chance
T-storms
Tonight
Low: 73 °F
Slight Chance
T-storms then
Mostly Clear
Saturday
High: 98 °F
Hot
Saturday Night
Low: 74 °F
Partly Cloudy
Sunday
High: 94 °F
Mostly Sunny
then Slight
Chance
T-storms
Sunday Night
Low: 68 °F
Chance
Showers
Monday
High: 82 °F
Showers
Likely
Monday Night
Low: 62 °F
Slight Chance
T-storms then
Chance
Showers

Detailed Forecast

This Afternoon

A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny and hot, with a high near 98. Heat index values as high as 107. Light southwest wind.

Tonight

A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 73. Light and variable wind becoming southeast around 5 mph.

Saturday

Increasing clouds and hot, with a high near 98. Heat index values as high as 101. Light and variable wind becoming west 5 to 8 mph in the morning.

Saturday Night

Partly cloudy, with a low around 74. South wind 3 to 5 mph.

Sunday

A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. West wind 3 to 7 mph. Chance of precipitation is 20%.

Sunday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

Monday

Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.

Monday Night

A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.

Tuesday

Mostly cloudy, with a high near 72.

Tuesday Night

Mostly cloudy, with a low around 55.

Wednesday

Mostly sunny, with a high near 75.

Wednesday Night

Partly cloudy, with a low around 56.

Thursday

Mostly sunny, with a high near 77.