Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

88°F

31°C

Humidity	50%
Wind Speed	NA
Barometer	30.02 in (1016.1 mb)
Dewpoint	67°F (19°C)
Visibility	10.00 mi
Heat Index	91°F (33°C)
Last update	4 Aug 1:53 pm CDT

More Information:

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

Extended Forecast for

Mascoutah IL

This Afternoon
High: 87 °F
Sunny
Tonight
Low: 67 °F
Mostly Clear
Wednesday
High: 90 °F
Sunny
Wednesday Night
Low: 71 °F
Chance
T-storms
Thursday
High: 85 °F
T-storms
Thursday Night
Low: 71 °F
Chance
T-storms
Friday
High: 86 °F
Chance
Showers then
Chance
T-storms
Friday Night
Low: 70 °F
Chance
T-storms
Saturday
High: 89 °F
Mostly Sunny

Detailed Forecast

This Afternoon

Sunny, with a high near 87. Light southeast wind.

Tonight

Mostly clear, with a low around 67. Light southeast wind.

Wednesday

Sunny, with a high near 90. Calm wind becoming south 5 to 8 mph in the morning.

Wednesday Night

A 40 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 71. Southeast wind around 6 mph becoming calm after midnight.

Thursday

Showers and thunderstorms, mainly before 1pm. High near 85. Light and variable wind becoming south around 5 mph. Chance of precipitation is 80%.

Thursday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.

Friday

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86.

Friday Night

A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.

Saturday

Mostly sunny, with a high near 89.

Saturday Night

Mostly clear, with a low around 72.