National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

74°F

23°C

Humidity 85%
Wind Speed W 8 mph
Barometer 29.68 in
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 1 Aug 2:35 am CDT
Extended Forecast for

Wilsonville IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 67. West wind around 10 mph.

    Low: 67 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 76. Southwest wind 6 to 11 mph becoming northwest in the afternoon. Chance of precipitation is 60%.

    High: 76 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 10pm, then a chance of showers. Mostly cloudy, with a low around 64. North wind 15 to 17 mph. Chance of precipitation is 70%.

    Low: 64 °F

    Showers
    Likely then
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers before 10am. Mostly cloudy, with a high near 79. North wind around 16 mph, with gusts as high as 24 mph.

    High: 79 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. North wind 6 to 11 mph becoming light.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 67. West wind around 10 mph.
Saturday
A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 76. Southwest wind 6 to 11 mph becoming northwest in the afternoon. Chance of precipitation is 60%.
Saturday Night
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers. Mostly cloudy, with a low around 64. North wind 15 to 17 mph. Chance of precipitation is 70%.
Sunday
A 20 percent chance of showers before 10am. Mostly cloudy, with a high near 79. North wind around 16 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 63. North wind 6 to 11 mph becoming light.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 62.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 86.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Wilsonville IL
 39.05°N 89.84°W (Elev. 600 ft)
Last Update:
1:26 am CDT Aug 1, 2026
Forecast Valid:
2am CDT Aug 1, 2026-6pm CDT Aug 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation