Current Conditions

Collinsville, Illinois

85°F29°C

Drizzle

Feels like92°F33°C

Wind

SE 5 mph8 km/h

Humidity

68%

Cloud Cover

94%

As of Wednesday, August 12, 2026 at 7:56 PM CDT

Today's Outlook

Night

Mostly cloudy, with a low around 77°F25°C. Breezy from the SE at 6 to 8 mph9 to 13 km/h. 13% chance of drizzle overnight.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Drizzle	High 93°F34°CFeels 102°F39°C	Low 77°F25°C	Precip 0.03 in0.7 mm13%	Cloud 87%	Wind SSE 5 mph8 km/h	Thursday: Overcast and hot, with a high of 93°F34°C and morning low of 77°F25°C — feels like 102°F39°C. Light wind from the S around 5 mph8 km/h. 11% chance of drizzle in the morning. Heat risk in the afternoon. Thursday Night: Mostly cloudy, with a low around 77°F25°C. Breezy from the SE at 6 to 8 mph9 to 13 km/h. 13% chance of drizzle overnight.
Drizzle	High 95°F35°CFeels 104°F40°C	Low 78°F26°C	Precip 0.01 in0.2 mm11%	Cloud 81%	Wind SSE 5 mph8 km/h	Friday: Overcast and hot, with a high of 95°F35°C and morning low of 78°F26°C — feels like 104°F40°C. Light wind from the SSE around 4 mph7 km/h. 11% chance of drizzle in the morning. Heat risk in the afternoon. Friday Night: Mostly cloudy, with a low around 80°F27°C. Breezy from the SSE at 6 to 8 mph10 to 12 km/h.
Drizzle	High 96°F36°CFeels 103°F40°C	Low 80°F27°C	Precip 0.02 in0.5 mm11%	Cloud 60%	Wind S 6 mph9 km/h	Saturday: Mostly cloudy and hot, with a high of 96°F36°C and morning low of 80°F27°C — feels like 104°F40°C. Breezy from the SW at 5 to 7 mph9 to 11 km/h. 11% chance of drizzle in the morning. Heat risk in the afternoon. Saturday Night: Partly cloudy, with a low around 81°F27°C. Light wind from the S around 6 mph9 km/h.
Drizzle	High 99°F37°CFeels 107°F41°C	Low 80°F27°C	Precip 0.01 in0.3 mm11%	Cloud 40%	Wind W 7 mph11 km/h	Sunday: Partly cloudy and hot, with a high of 99°F37°C and morning low of 80°F27°C — feels like 106°F41°C. Breezy from the W at 7 mph11 km/h. Heat risk in the afternoon. Sunday Night: Partly cloudy, with a low around 82°F28°C. Breezy from the W at 7 to 8 mph11 to 12 km/h. 11% chance of drizzle in the evening.
Showers	High 88°F31°CFeels 91°F33°C	Low 74°F24°C	Precip 0.05 in1.3 mm17%	Cloud 54%	Wind N 6 mph10 km/h	Monday: Mostly cloudy and hot, with a high of 88°F31°C and morning low of 74°F24°C. Light wind from the NNW around 6 mph10 km/h. Humid. Monday Night: Mostly cloudy, with a low around 76°F25°C. Light wind from the N around 6 mph10 km/h. 17% chance of showers overnight.
Clear	High 91°F33°CFeels 94°F34°C	Low 70°F21°C	Precip 0.05 in1.3 mm9%	Cloud 31%	Wind ESE 4 mph7 km/h	Tuesday: Partly cloudy and hot, with a high of 91°F33°C and morning low of 70°F21°C. Light wind from the SE around 3 mph6 km/h. Humid. Tuesday Night: Partly cloudy, with a low around 72°F22°C. Light wind from the E around 5 mph8 km/h.
Drizzle	High 97°F36°C	Low 76°F24°C	Precip 0.04 in1.1 mm12%	Cloud 55%	Wind SSW 7 mph11 km/h	Wednesday: Mostly cloudy and hot, with a high of 97°F36°C and morning low of 76°F24°C. Breezy from the SW at 7 to 8 mph12 to 13 km/h. 10% 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 7 mph11 km/h. 12% chance of drizzle throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdayAug 13	93°F34°C Feels 102°F39°C	77°F25°C	0.03 in0.7 mm· 13%	87%	Drizzle	SSE 5 mph8 km/h
DayOvercast and hot, with a high of 93°F34°C and morning low of 77°F25°C — feels like 102°F39°C. Light wind from the S around 5 mph8 km/h. 11% chance of drizzle in the morning. Heat risk in the afternoon. NightMostly cloudy, with a low around 77°F25°C. Breezy from the SE at 6 to 8 mph9 to 13 km/h. 13% chance of drizzle overnight.
	FridayAug 14	95°F35°C Feels 104°F40°C	78°F26°C	0.01 in0.2 mm· 11%	81%	Drizzle	SSE 5 mph8 km/h
DayOvercast and hot, with a high of 95°F35°C and morning low of 78°F26°C — feels like 104°F40°C. Light wind from the SSE around 4 mph7 km/h. 11% chance of drizzle in the morning. Heat risk in the afternoon. NightMostly cloudy, with a low around 80°F27°C. Breezy from the SSE at 6 to 8 mph10 to 12 km/h.
	SaturdayAug 15	96°F36°C Feels 103°F40°C	80°F27°C	0.02 in0.5 mm· 11%	60%	Drizzle	S 6 mph9 km/h
DayMostly cloudy and hot, with a high of 96°F36°C and morning low of 80°F27°C — feels like 104°F40°C. Breezy from the SW at 5 to 7 mph9 to 11 km/h. 11% chance of drizzle in the morning. Heat risk in the afternoon. NightPartly cloudy, with a low around 81°F27°C. Light wind from the S around 6 mph9 km/h.
	SundayAug 16	99°F37°C Feels 107°F41°C	80°F27°C	0.01 in0.3 mm· 11%	40%	Drizzle	W 7 mph11 km/h
DayPartly cloudy and hot, with a high of 99°F37°C and morning low of 80°F27°C — feels like 106°F41°C. Breezy from the W at 7 mph11 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 82°F28°C. Breezy from the W at 7 to 8 mph11 to 12 km/h. 11% chance of drizzle in the evening.
	MondayAug 17	88°F31°C Feels 91°F33°C	74°F24°C	0.05 in1.3 mm· 17%	54%	Showers	N 6 mph10 km/h
DayMostly cloudy and hot, with a high of 88°F31°C and morning low of 74°F24°C. Light wind from the NNW around 6 mph10 km/h. Humid. NightMostly cloudy, with a low around 76°F25°C. Light wind from the N around 6 mph10 km/h. 17% chance of showers overnight.
	TuesdayAug 18	91°F33°C Feels 94°F34°C	70°F21°C	0.05 in1.3 mm· 9%	31%	Clear	ESE 4 mph7 km/h
DayPartly cloudy and hot, with a high of 91°F33°C and morning low of 70°F21°C. Light wind from the SE around 3 mph6 km/h. Humid. NightPartly cloudy, with a low around 72°F22°C. Light wind from the E around 5 mph8 km/h.
	WednesdayAug 19	97°F36°C	76°F24°C	0.04 in1.1 mm· 12%	55%	Drizzle	SSW 7 mph11 km/h
DayMostly cloudy and hot, with a high of 97°F36°C and morning low of 76°F24°C. Breezy from the SW at 7 to 8 mph12 to 13 km/h. 10% chance of drizzle in the morning. Heat risk in the afternoon. NightMostly cloudy, with a low around 77°F25°C. Breezy from the SSE at 7 mph11 km/h. 12% chance of drizzle throughout the night.
	ThursdayAug 20	92°F33°C Feels 95°F35°C	75°F24°C	0.04 in1.1 mm· 14%	44%	Drizzle	NW 6 mph10 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 75°F24°C. Breezy from the WNW at 6 to 7 mph10 to 11 km/h. 14% chance of drizzle throughout the day. Humid. NightPartly cloudy, with a low around 78°F25°C. Breezy from the NNE at 6 to 7 mph10 to 11 km/h. 13% chance of drizzle throughout the night.
	FridayAug 21	90°F32°C	72°F22°C	0.05 in1.2 mm· 9%	40%	Clear	NE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 90°F32°C and morning low of 72°F22°C. Light wind from the NW around 6 mph10 km/h. Humid. NightPartly cloudy, with a low around 74°F23°C. Light wind from the ENE around 6 mph10 km/h.
	SaturdayAug 22	91°F33°C	70°F21°C	0.02 in0.6 mm· 9%	36%	Clear	E 6 mph9 km/h
DayPartly cloudy and hot, with a high of 91°F33°C and morning low of 70°F21°C. Light wind from the SW around 6 mph9 km/h. NightPartly cloudy, with a low around 72°F22°C. Light wind from the E around 6 mph9 km/h.
	SundayAug 23	91°F33°C	71°F21°C	0.02 in0.4 mm· 7%	34%	Clear	ENE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 91°F33°C and morning low of 71°F21°C. Light wind from the WNW around 6 mph9 km/h. NightPartly cloudy, with a low around 72°F22°C. Light wind from the ENE around 6 mph9 km/h.
	MondayAug 24	90°F32°C	70°F21°C	0.03 in0.8 mm· 8%	34%	Clear	NE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 90°F32°C and morning low of 70°F21°C. Light wind from the N around 6 mph9 km/h. NightPartly cloudy, with a low around 72°F22°C. Light wind from the NE around 6 mph9 km/h.
	TuesdayAug 25	90°F32°C	69°F21°C	0.05 in1.3 mm· 8%	35%	Clear	NE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 90°F32°C and morning low of 69°F21°C. Light wind from the N around 6 mph9 km/h. NightPartly cloudy, with a low around 71°F22°C. Light wind from the ENE around 6 mph9 km/h.
	WednesdayAug 26	90°F32°C	70°F21°C	0.04 in1 mm· 11%	34%	Drizzle	NE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 90°F32°C and morning low of 70°F21°C. Light wind from the N around 6 mph9 km/h. NightPartly cloudy, with a low around 72°F22°C. Light wind from the ENE around 6 mph9 km/h. 11% chance of drizzle throughout the night.
	ThursdayAug 27	88°F31°C	68°F20°C	0.04 in1 mm· 12%	37%	Drizzle	ENE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 88°F31°C and morning low of 68°F20°C. Light wind from the ENE around 6 mph9 km/h. NightPartly cloudy, with a low around 70°F21°C. Light wind from the ENE around 6 mph9 km/h. 12% chance of drizzle before dawn.

Nearby Cities

Fairview Heights6 mi9 km O'Fallon7 mi11 km Granite City9 mi15 km East Saint Louis10 mi15 km Edwardsville10 mi16 km Belleville10 mi17 km

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

Pattern	Example	Description
/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=11.5	Find 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: 38.6703°N, 89.9845°W·Elevation: 171m·Timezone: America/Chicago·Population: 24,754