Current Conditions

Upper Alton, Illinois

87°F30°C

Hot

Feels like91°F33°C

Wind

S 8 mph12 km/h

Humidity

54%

Cloud Cover

10%

As of Wednesday, September 2, 2026 at 10:02 PM CDT

Today's Outlook

Night

Mostly clear, with a low around 80°F27°C. Breezy from the S at 6 to 8 mph10 to 13 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Hot	High 100°F38°C	Low 78°F25°C	Precip 0 in0 mm—	Cloud 8%	Wind SSW 6 mph10 km/h	Thursday: Mostly clear and hot, with a high of 100°F38°C and morning low of 78°F25°C. Breezy from the SSW at 6 to 7 mph10 to 11 km/h. Heat risk in the afternoon. Thursday Night: Mostly clear, with a low around 80°F27°C. Breezy from the S at 6 to 8 mph10 to 13 km/h.
Hot	High 100°F38°C	Low 77°F25°C	Precip 0 in0 mm—	Cloud 7%	Wind SSW 5 mph7 km/h	Friday: Mostly clear and hot, with a high of 100°F38°C and morning low of 77°F25°C. Light wind from the SW around 4 mph7 km/h. Heat risk in the afternoon. Friday Night: Mostly clear, with a low around 80°F27°C. Breezy from the S at 5 to 7 mph8 to 11 km/h.
Drizzle	High 99°F37°C	Low 78°F26°C	Precip 0.03 in0.7 mm30%	Cloud 29%	Wind NE 4 mph7 km/h	Saturday: Partly cloudy and hot, with a high of 99°F37°C and morning low of 78°F26°C. Light wind from the NW around 4 mph6 km/h. 30% chance of drizzle in the afternoon. Heat risk in the afternoon. Saturday Night: Partly cloudy, with a low around 80°F27°C. Light wind from the ESE around 5 mph8 km/h. 26% chance of drizzle in the evening.
Drizzle	High 93°F34°CFeels 97°F36°C	Low 75°F24°C	Precip 0.02 in0.5 mm12%	Cloud 41%	Wind ENE 6 mph10 km/h	Sunday: Partly cloudy and hot, with a high of 93°F34°C and morning low of 75°F24°C. Light wind from the ENE around 6 mph9 km/h. 12% chance of drizzle in the afternoon. Heat risk in the afternoon. Sunday Night: Partly cloudy, with a low around 78°F25°C. Breezy from the ENE at 6 to 8 mph10 to 12 km/h.
Clear	High 92°F33°C	Low 71°F22°C	Precip 0.01 in0.3 mm4%	Cloud 33%	Wind ESE 6 mph9 km/h	Monday: Partly cloudy and hot, with a high of 92°F33°C and morning low of 71°F22°C. Light wind from the ESE around 5 mph9 km/h. Monday Night: Partly cloudy, with a low around 74°F23°C. Breezy from the E at 6 to 7 mph10 to 11 km/h.
Hot	High 98°F37°C	Low 72°F22°C	Precip 0 in0 mm—	Cloud 22%	Wind SSE 7 mph11 km/h	Tuesday: Partly cloudy and hot, with a high of 98°F37°C and morning low of 72°F22°C. Breezy from the S at 6 to 7 mph10 to 12 km/h. Heat risk in the afternoon. Tuesday Night: Mostly clear, with a low around 74°F23°C. Breezy from the SSE at 7 to 9 mph12 to 15 km/h.
Hot	High 97°F36°CFeels 101°F38°C	Low 78°F25°C	Precip 0 in0.1 mm3%	Cloud 23%	Wind SSW 9 mph14 km/h	Wednesday: Partly cloudy and hot, with a high of 97°F36°C and morning low of 78°F25°C. Breezy from the SSW at 9 mph14 km/h. Heat risk in the afternoon. Wednesday Night: Mostly clear, with a low around 79°F26°C. Breezy from the S at 9 to 10 mph14 to 16 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdaySep 3	100°F38°C	78°F25°C	0 in0 mm· —	8%	Hot	SSW 6 mph10 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 78°F25°C. Breezy from the SSW at 6 to 7 mph10 to 11 km/h. Heat risk in the afternoon. NightMostly clear, with a low around 80°F27°C. Breezy from the S at 6 to 8 mph10 to 13 km/h.
	FridaySep 4	100°F38°C	77°F25°C	0 in0 mm· —	7%	Hot	SSW 5 mph7 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 77°F25°C. Light wind from the SW around 4 mph7 km/h. Heat risk in the afternoon. NightMostly clear, with a low around 80°F27°C. Breezy from the S at 5 to 7 mph8 to 11 km/h.
	SaturdaySep 5	99°F37°C	78°F26°C	0.03 in0.7 mm· 30%	29%	Drizzle	NE 4 mph7 km/h
DayPartly cloudy and hot, with a high of 99°F37°C and morning low of 78°F26°C. Light wind from the NW around 4 mph6 km/h. 30% chance of drizzle in the afternoon. Heat risk in the afternoon. NightPartly cloudy, with a low around 80°F27°C. Light wind from the ESE around 5 mph8 km/h. 26% chance of drizzle in the evening.
	SundaySep 6	93°F34°C Feels 97°F36°C	75°F24°C	0.02 in0.5 mm· 12%	41%	Drizzle	ENE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 93°F34°C and morning low of 75°F24°C. Light wind from the ENE around 6 mph9 km/h. 12% chance of drizzle in the afternoon. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the ENE at 6 to 8 mph10 to 12 km/h.
	MondaySep 7	92°F33°C	71°F22°C	0.01 in0.3 mm· 4%	33%	Clear	ESE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 71°F22°C. Light wind from the ESE around 5 mph9 km/h. NightPartly cloudy, with a low around 74°F23°C. Breezy from the E at 6 to 7 mph10 to 11 km/h.
	TuesdaySep 8	98°F37°C	72°F22°C	0 in0 mm· —	22%	Hot	SSE 7 mph11 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 72°F22°C. Breezy from the S at 6 to 7 mph10 to 12 km/h. Heat risk in the afternoon. NightMostly clear, with a low around 74°F23°C. Breezy from the SSE at 7 to 9 mph12 to 15 km/h.
	WednesdaySep 9	97°F36°C Feels 101°F38°C	78°F25°C	0 in0.1 mm· 3%	23%	Hot	SSW 9 mph14 km/h
DayPartly cloudy and hot, with a high of 97°F36°C and morning low of 78°F25°C. Breezy from the SSW at 9 mph14 km/h. Heat risk in the afternoon. NightMostly clear, with a low around 79°F26°C. Breezy from the S at 9 to 10 mph14 to 16 km/h.
	ThursdaySep 10	93°F34°C Feels 97°F36°C	78°F25°C	0.07 in1.7 mm· 15%	41%	Drizzle	SSW 8 mph13 km/h
DayPartly cloudy and hot, with a high of 93°F34°C and morning low of 78°F25°C. Breezy from the SW at 8 to 9 mph13 to 14 km/h. 12% chance of drizzle throughout the day. Heat risk in the afternoon. NightPartly cloudy, with a low around 80°F27°C. Breezy from the SSW at 8 to 10 mph13 to 16 km/h. 15% chance of drizzle throughout the night.
	FridaySep 11	89°F32°C	73°F23°C	0.13 in3.4 mm· 21%	49%	Showers	SSW 7 mph11 km/h
DayMostly cloudy and hot, with a high of 89°F32°C and morning low of 73°F23°C. Breezy from the SW at 7 to 8 mph11 to 12 km/h. 21% chance of drizzle throughout the day. Humid. NightPartly cloudy, with a low around 76°F24°C. Breezy from the S at 7 to 8 mph11 to 12 km/h. 20% chance of showers throughout the night.
	SaturdaySep 12	88°F31°C	71°F21°C	0.11 in2.7 mm· 18%	50%	Showers	S 7 mph11 km/h
DayMostly cloudy and hot, with a high of 88°F31°C and morning low of 71°F21°C. Breezy from the SSW at 7 to 8 mph11 to 12 km/h. 15% chance of drizzle throughout the day. NightPartly cloudy, with a low around 73°F23°C. Breezy from the S at 7 mph11 km/h. 18% chance of showers throughout the night.
	SundaySep 13	88°F31°C	70°F21°C	0.1 in2.5 mm· 15%	49%	Drizzle	S 7 mph12 km/h
DayMostly cloudy and hot, with a high of 88°F31°C and morning low of 70°F21°C. Breezy from the S at 8 mph12 km/h. 15% chance of drizzle throughout the day. NightPartly cloudy, with a low around 72°F22°C. Breezy from the S at 7 to 8 mph11 to 12 km/h. 15% chance of drizzle throughout the night.
	MondaySep 14	88°F31°C	70°F21°C	0.13 in3.3 mm· 20%	47%	Showers	S 7 mph11 km/h
DayPartly cloudy and hot, with a high of 88°F31°C and morning low of 70°F21°C. Breezy from the SSW at 7 mph11 km/h. 16% chance of showers throughout the day. NightPartly cloudy, with a low around 72°F22°C. Breezy from the SSE at 7 mph11 km/h. 20% chance of showers throughout the night.
	TuesdaySep 15	85°F30°C	69°F20°C	0.11 in2.7 mm· 19%	47%	Drizzle	S 7 mph11 km/h
DayPartly cloudy and warm, with a high of 85°F30°C and morning low of 69°F20°C. Breezy from the SW at 7 mph11 km/h. 19% chance of drizzle throughout the day. NightPartly cloudy, with a low around 71°F22°C. Breezy from the SSE at 6 to 7 mph10 to 11 km/h. 17% chance of drizzle throughout the night.
	WednesdaySep 16	85°F29°C	66°F19°C	0.07 in1.7 mm· 11%	39%	Drizzle	ENE 6 mph10 km/h
DayPartly cloudy and warm, with a high of 85°F29°C and morning low of 66°F19°C. Breezy from the NW at 7 mph11 km/h. 11% chance of drizzle throughout the day. NightPartly cloudy, with a low around 68°F20°C. Breezy from the E at 6 to 7 mph10 to 11 km/h. 10% chance of drizzle throughout the night.
	ThursdaySep 17	83°F28°C	64°F18°C	0.08 in2 mm· 10%	37%	Drizzle	ENE 6 mph10 km/h
DayPartly cloudy and warm, with a high of 83°F28°C and morning low of 64°F18°C. Breezy from the ENE at 6 to 7 mph10 to 11 km/h. 10% chance of drizzle throughout the day. NightPartly cloudy, with a low around 67°F19°C. Light wind from the E around 6 mph9 km/h. 10% chance of drizzle throughout the night.

Nearby Cities

Alton2 mi4 km Godfrey4 mi6 km Old Jamestown9 mi14 km Spanish Lake9 mi15 km Florissant13 mi20 km Edwardsville13 mi20 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.

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