Current Conditions

Upper Alton, Illinois

75°F24°C
Drizzle

Wind

SSE 5 mph8 km/h

Humidity

91%

Cloud Cover

83%

As of Thursday, August 13, 2026 at 7:55 AM CDT

Today's Outlook

Day

Overcast and hot, with a high of 94°F34°C and morning low of 75°F24°C — feels like 106°F41°C. Light wind from the SSE around 4 mph7 km/h. 11% chance of drizzle. Heat risk in the afternoon.

Night

Mostly cloudy, with a low around 85°F30°C. Breezy from the SE at 8 to 9 mph12 to 14 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
DrizzleHigh 94°F34°CFeels 106°F41°CLow 75°F24°CPrecip 0.01 in0.3 mm11%Cloud 81%Wind SSE 5 mph9 km/hThursday: Overcast and hot, with a high of 94°F34°C and morning low of 75°F24°C — feels like 106°F41°C. Light wind from the SSE around 4 mph7 km/h. 11% chance of drizzle. Heat risk in the afternoon. Thursday Night: Mostly cloudy, with a low around 85°F30°C. Breezy from the SE at 8 to 9 mph12 to 14 km/h.
HotHigh 94°F35°CFeels 103°F40°CLow 78°F26°CPrecip 0.02 in0.4 mm5%Cloud 70%Wind SSE 6 mph9 km/hFriday: Overcast and hot, with a high of 94°F35°C and morning low of 78°F26°C — feels like 104°F40°C. Light wind from the SSE around 5 mph8 km/h. Heat risk in the afternoon. Friday Night: Mostly cloudy, with a low around 81°F27°C. Breezy from the SSE at 6 to 8 mph10 to 13 km/h.
DrizzleHigh 93°F34°CFeels 101°F38°CLow 79°F26°CPrecip 0.05 in1.3 mm19%Cloud 73%Wind S 5 mph9 km/hSaturday: Overcast and hot, with a high of 93°F34°C and morning low of 79°F26°C — feels like 100°F38°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. 19% chance of drizzle throughout the day. Heat risk in the afternoon. Saturday Night: Mostly cloudy, with a low around 81°F27°C. Breezy from the SSE at 6 to 7 mph9 to 11 km/h. 13% chance of drizzle overnight.
ShowersHigh 96°F36°CFeels 106°F41°CLow 80°F26°CPrecip 0.05 in1.2 mm24%Cloud 52%Wind W 7 mph11 km/hSunday: Mostly cloudy and hot, with a high of 96°F36°C and morning low of 80°F26°C — feels like 106°F41°C. Breezy from the W at 6 to 7 mph10 to 11 km/h. Heat risk in the afternoon. Sunday Night: Mostly cloudy, with a low around 81°F27°C. Breezy from the WNW at 7 mph11 km/h. 24% chance of showers in the evening.
ShowersHigh 86°F30°CLow 73°F23°CPrecip 0.04 in1.1 mm15%Cloud 54%Wind NNW 6 mph10 km/hMonday: Mostly cloudy and hot, with a high of 86°F30°C and morning low of 73°F23°C. Breezy from the NNW at 7 mph11 km/h. Humid. Monday Night: Mostly cloudy, with a low around 75°F24°C. Light wind from the N around 6 mph9 km/h. 15% chance of showers overnight.
ClearHigh 90°F32°CLow 69°F21°CPrecip 0.02 in0.6 mm7%Cloud 24%Wind SE 4 mph6 km/hTuesday: Mostly clear and hot, with a high of 90°F32°C and morning low of 69°F21°C. Light wind from the SSE around 3 mph6 km/h. Humid. Tuesday Night: Partly cloudy, with a low around 71°F21°C. Breezy from the ESE at 5 to 7 mph7 to 11 km/h.
DrizzleHigh 94°F34°CFeels 99°F37°CLow 75°F24°CPrecip 0.06 in1.4 mm15%Cloud 56%Wind S 8 mph12 km/hWednesday: Mostly cloudy and hot, with a high of 94°F34°C and morning low of 75°F24°C. Breezy from the SSW at 8 mph13 km/h. 14% chance of drizzle in the morning. Heat risk in the afternoon. Wednesday Night: Mostly cloudy, with a low around 77°F25°C. Breezy from the SSE at 8 mph12 km/h. 15% chance of drizzle throughout the night.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
ThursdayAug 1394°F34°C
Feels 106°F41°C
75°F24°C0.01 in0.3 mm· 11%81%DrizzleSSE 5 mph9 km/h
FridayAug 1494°F35°C
Feels 103°F40°C
78°F26°C0.02 in0.4 mm· 5%70%HotSSE 6 mph9 km/h
SaturdayAug 1593°F34°C
Feels 101°F38°C
79°F26°C0.05 in1.3 mm· 19%73%DrizzleS 5 mph9 km/h
SundayAug 1696°F36°C
Feels 106°F41°C
80°F26°C0.05 in1.2 mm· 24%52%ShowersW 7 mph11 km/h
MondayAug 1786°F30°C73°F23°C0.04 in1.1 mm· 15%54%ShowersNNW 6 mph10 km/h
TuesdayAug 1890°F32°C69°F21°C0.02 in0.6 mm· 7%24%ClearSE 4 mph6 km/h
WednesdayAug 1994°F34°C
Feels 99°F37°C
75°F24°C0.06 in1.4 mm· 15%56%DrizzleS 8 mph12 km/h
ThursdayAug 2087°F30°C73°F23°C0.09 in2.2 mm· 16%46%DrizzleN 7 mph11 km/h
FridayAug 2187°F31°C68°F20°C0.04 in1.1 mm· 10%40%DrizzleENE 6 mph9 km/h
SaturdayAug 2289°F32°C69°F21°C0.04 in1.1 mm· 12%35%DrizzleESE 6 mph9 km/h
SundayAug 2391°F33°C70°F21°C0.02 in0.5 mm· 6%33%ClearESE 6 mph10 km/h
MondayAug 2493°F34°C71°F22°C0.01 in0.3 mm· 4%32%ClearSE 6 mph10 km/h
TuesdayAug 2594°F34°C72°F22°C0.02 in0.4 mm· 5%38%ClearSSE 6 mph10 km/h
WednesdayAug 2693°F34°C73°F23°C0.03 in0.8 mm· 9%41%Partly CloudyENE 6 mph10 km/h
ThursdayAug 2791°F33°C71°F22°C0.04 in0.9 mm· 9%45%Partly CloudyENE 6 mph10 km/h

Nearby Cities

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

PatternExampleDescription
/weather/{country}/{city}//weather/united-states/san-francisco/City forecast (canonical URL)
/weather/{city}//weather/tokyo/Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}//weather/united-states/california/san-francisco/With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}/weather/nearby?lat=48.1&lon=11.5Find nearest city by coordinates
/weather/{country}//weather/germany/Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 38.9114°N, 90.1507°W·Elevation: 166m·Timezone: America/Chicago·Population: 29,251