Current Conditions

Upper Alton, Illinois

62°F17°C

Cloudy

Wind

NE 7 mph11 km/h

Humidity

74%

Cloud Cover

58%

As of Wednesday, September 23, 2026 at 1:43 AM CDT

Today's Outlook

Day

Overcast and warm, with a high of 69°F21°C and morning low of 59°F15°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h.

Night

Mostly cloudy, with a low around 61°F16°C. Breezy from the NE at 6 to 7 mph10 to 11 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Cloudy	High 69°F21°C	Low 59°F15°C	Precip 0 in0.1 mm1%	Cloud 80%	Wind NNE 7 mph11 km/h	Wednesday: Overcast and warm, with a high of 69°F21°C and morning low of 59°F15°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h. Wednesday Night: Mostly cloudy, with a low around 61°F16°C. Breezy from the NE at 6 to 7 mph10 to 11 km/h.
Cloudy	High 71°F22°C	Low 60°F15°C	Precip 0 in0 mm—	Cloud 83%	Wind NE 5 mph8 km/h	Thursday: Overcast and warm, with a high of 71°F22°C and morning low of 60°F15°C. Light wind from the NE around 5 mph8 km/h. Thursday Night: Mostly cloudy, with a low around 61°F16°C. Light wind from the NE around 5 mph7 km/h.
Cloudy	High 76°F24°C	Low 62°F17°C	Precip 0.01 in0.2 mm4%	Cloud 88%	Wind ENE 4 mph7 km/h	Friday: Overcast and warm, with a high of 76°F24°C and morning low of 62°F17°C. Light wind from the ENE around 5 mph7 km/h. Friday Night: Overcast, with a low around 63°F17°C. Light wind from the ENE around 4 mph7 km/h.
Drizzle	High 71°F22°C	Low 62°F17°C	Precip 0.07 in1.9 mm35%	Cloud 89%	Wind E 5 mph8 km/h	Saturday: Overcast and warm, with a high of 71°F22°C and morning low of 62°F17°C. Light wind from the E around 4 mph7 km/h. 35% chance of drizzle throughout the day. Saturday Night: Overcast, with a low around 64°F18°C. Light wind from the E around 5 mph8 km/h. 32% chance of drizzle in the evening.
Drizzle	High 75°F24°C	Low 61°F16°C	Precip 0.05 in1.3 mm20%	Cloud 62%	Wind ENE 4 mph7 km/h	Sunday: Mostly cloudy and warm, with a high of 75°F24°C and morning low of 61°F16°C. Light wind from the E around 4 mph6 km/h. 20% chance of drizzle throughout the day. Sunday Night: Mostly cloudy, with a low around 62°F17°C. Light wind from the ENE around 4 mph7 km/h. 20% chance of drizzle overnight.
Clear	High 79°F26°C	Low 57°F14°C	Precip 0 in0.1 mm5%	Cloud 30%	Wind ENE 4 mph7 km/h	Monday: Mostly clear and warm, with a high of 79°F26°C and morning low of 57°F14°C. Light wind from the ENE around 4 mph6 km/h. Dry air. Monday Night: Partly cloudy, with a low around 60°F15°C. Light wind from the ENE around 5 mph7 km/h.
Light Rain	High 79°F26°C	Low 58°F15°C	Precip 0.15 in3.9 mm39%	Cloud 72%	Wind SSE 7 mph11 km/h	Tuesday: Mostly cloudy and warm, with a high of 79°F26°C and morning low of 58°F15°C. Breezy from the SSE at 7 to 9 mph12 to 14 km/h. 25% chance of light rain throughout the day. Tuesday Night: Mostly cloudy, with a low around 60°F16°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. 39% chance of light rain in the evening.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 23	69°F21°C	59°F15°C	0 in0.1 mm· 1%	80%	Cloudy	NNE 7 mph11 km/h
DayOvercast and warm, with a high of 69°F21°C and morning low of 59°F15°C. Breezy from the NNE at 7 to 8 mph12 to 13 km/h. NightMostly cloudy, with a low around 61°F16°C. Breezy from the NE at 6 to 7 mph10 to 11 km/h.
	ThursdaySep 24	71°F22°C	60°F15°C	0 in0 mm· —	83%	Cloudy	NE 5 mph8 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 60°F15°C. Light wind from the NE around 5 mph8 km/h. NightMostly cloudy, with a low around 61°F16°C. Light wind from the NE around 5 mph7 km/h.
	FridaySep 25	76°F24°C	62°F17°C	0.01 in0.2 mm· 4%	88%	Cloudy	ENE 4 mph7 km/h
DayOvercast and warm, with a high of 76°F24°C and morning low of 62°F17°C. Light wind from the ENE around 5 mph7 km/h. NightOvercast, with a low around 63°F17°C. Light wind from the ENE around 4 mph7 km/h.
	SaturdaySep 26	71°F22°C	62°F17°C	0.07 in1.9 mm· 35%	89%	Drizzle	E 5 mph8 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 62°F17°C. Light wind from the E around 4 mph7 km/h. 35% chance of drizzle throughout the day. NightOvercast, with a low around 64°F18°C. Light wind from the E around 5 mph8 km/h. 32% chance of drizzle in the evening.
	SundaySep 27	75°F24°C	61°F16°C	0.05 in1.3 mm· 20%	62%	Drizzle	ENE 4 mph7 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 61°F16°C. Light wind from the E around 4 mph6 km/h. 20% chance of drizzle throughout the day. NightMostly cloudy, with a low around 62°F17°C. Light wind from the ENE around 4 mph7 km/h. 20% chance of drizzle overnight.
	MondaySep 28	79°F26°C	57°F14°C	0 in0.1 mm· 5%	30%	Clear	ENE 4 mph7 km/h
DayMostly clear and warm, with a high of 79°F26°C and morning low of 57°F14°C. Light wind from the ENE around 4 mph6 km/h. Dry air. NightPartly cloudy, with a low around 60°F15°C. Light wind from the ENE around 5 mph7 km/h.
	TuesdaySep 29	79°F26°C	58°F15°C	0.15 in3.9 mm· 39%	72%	Light Rain	SSE 7 mph11 km/h
DayMostly cloudy and warm, with a high of 79°F26°C and morning low of 58°F15°C. Breezy from the SSE at 7 to 9 mph12 to 14 km/h. 25% chance of light rain throughout the day. NightMostly cloudy, with a low around 60°F16°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. 39% chance of light rain in the evening.
	WednesdaySep 30	73°F23°C	65°F18°C	0.44 in11.1 mm· 48%	79%	Light Rain	SW 8 mph13 km/h
DayOvercast and warm, with a high of 73°F23°C and morning low of 65°F18°C. Breezy from the WSW at 9 mph14 km/h. 48% chance of light rain throughout the day. NightMostly cloudy, with a low around 65°F18°C. Breezy from the SSW at 8 mph12 km/h. 45% chance of light rain throughout the night.
	ThursdayOct 1	73°F23°C	59°F15°C	0.2 in5.1 mm· 27%	53%	Showers	WNW 8 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 59°F15°C. Breezy from the WNW at 8 to 9 mph13 to 14 km/h. 23% chance of showers throughout the day. NightMostly cloudy, with a low around 61°F16°C. Breezy from the WNW at 7 mph11 km/h. 27% chance of showers throughout the night.
	FridayOct 2	74°F24°C	57°F14°C	0.16 in4 mm· 20%	48%	Showers	SSW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 74°F24°C and morning low of 57°F14°C. Breezy from the SW at 7 to 8 mph12 to 13 km/h. 19% chance of showers throughout the day. NightPartly cloudy, with a low around 59°F15°C. Light wind from the S around 6 mph10 km/h. 20% chance of showers throughout the night.
	SaturdayOct 3	76°F24°C	59°F15°C	0.12 in3 mm· 15%	55%	Showers	SSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 76°F24°C and morning low of 59°F15°C. Breezy from the SSW at 7 to 8 mph12 to 13 km/h. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 60°F16°C. Breezy from the S at 7 to 8 mph11 to 13 km/h. 13% chance of showers throughout the night.
	SundayOct 4	72°F22°C	58°F14°C	0.17 in4.2 mm· 21%	51%	Showers	WNW 8 mph13 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 58°F14°C. Breezy from the WNW at 8 to 9 mph13 to 15 km/h. 21% chance of showers throughout the day. NightMostly cloudy, with a low around 60°F15°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 19% chance of showers throughout the night.
	MondayOct 5	71°F22°C	54°F12°C	0.11 in2.8 mm· 14%	49%	Showers	WNW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 71°F22°C and morning low of 54°F12°C. Breezy from the W at 7 to 8 mph12 to 12 km/h. 14% chance of drizzle throughout the day. Dry air. NightPartly cloudy, with a low around 56°F13°C. Breezy from the WNW at 7 mph11 km/h. 13% chance of showers throughout the night.
	TuesdayOct 6	71°F22°C	54°F12°C	0.09 in2.2 mm· 15%	43%	Drizzle	W 7 mph11 km/h
DayPartly cloudy and warm, with a high of 71°F22°C and morning low of 54°F12°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 14% chance of drizzle throughout the day. Dry air. NightPartly cloudy, with a low around 55°F13°C. Light wind from the W around 6 mph10 km/h. 15% chance of drizzle throughout the night.
	WednesdayOct 7	71°F22°C	53°F12°C	0.08 in2 mm· 13%	41%	Drizzle	WNW 7 mph12 km/h
DayPartly cloudy and warm, with a high of 71°F22°C and morning low of 53°F12°C. Breezy from the WNW at 8 to 9 mph12 to 14 km/h. 13% chance of drizzle throughout the day. Dry air. NightPartly cloudy, with a low around 55°F13°C. Breezy from the WNW at 7 mph11 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