Current Conditions

Alton, Illinois

64°F18°C

Cloudy

Wind

NE 7 mph12 km/h

Humidity

78%

Cloud Cover

93%

As of Tuesday, September 22, 2026 at 9:09 AM CDT

Today's Outlook

Day

Overcast and warm, with a high of 69°F21°C and morning low of 63°F17°C. Breezy from the NE at 7 mph11 km/h.

Night

Mostly cloudy, with a low around 64°F18°C. Breezy from the NNE at 8 mph12 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Cloudy	High 69°F21°C	Low 63°F17°C	Precip 0.01 in0.2 mm8%	Cloud 85%	Wind NE 7 mph12 km/h	Tuesday: Overcast and warm, with a high of 69°F21°C and morning low of 63°F17°C. Breezy from the NE at 7 mph11 km/h. Tuesday Night: Mostly cloudy, with a low around 64°F18°C. Breezy from the NNE at 8 mph12 km/h.
Cloudy	High 68°F20°C	Low 59°F15°C	Precip 0.01 in0.2 mm7%	Cloud 81%	Wind NNE 7 mph11 km/h	Wednesday: Overcast and mild, with a high of 68°F20°C and morning low of 59°F15°C. Breezy from the NNE at 8 mph12 km/h. Wednesday Night: Mostly cloudy, with a low around 60°F16°C. Breezy from the NNE at 6 to 7 mph10 to 11 km/h.
Cloudy	High 71°F22°C	Low 59°F15°C	Precip 0 in0 mm—	Cloud 81%	Wind NE 5 mph8 km/h	Thursday: Overcast and warm, with a high of 71°F22°C and morning low of 59°F15°C. Light wind from the NNE around 5 mph8 km/h. Thursday Night: Mostly cloudy, with a low around 60°F16°C. Light wind from the NE around 5 mph7 km/h.
Cloudy	High 75°F24°C	Low 62°F17°C	Precip 0.01 in0.3 mm8%	Cloud 84%	Wind NE 4 mph7 km/h	Friday: Overcast and warm, with a high of 75°F24°C and morning low of 62°F17°C. Light wind from the NE around 4 mph7 km/h. Friday Night: Overcast, with a low around 62°F17°C. Light wind from the NE around 4 mph7 km/h.
Drizzle	High 73°F23°C	Low 58°F14°C	Precip 0.06 in1.4 mm21%	Cloud 83%	Wind E 4 mph7 km/h	Saturday: Overcast and warm, with a high of 73°F23°C and morning low of 58°F14°C. Light wind from the E around 4 mph7 km/h. 21% chance of drizzle throughout the day. Saturday Night: Mostly cloudy, with a low around 60°F16°C. Light wind from the E around 5 mph7 km/h. 18% chance of drizzle in the evening.
Drizzle	High 76°F24°C	Low 58°F15°C	Precip 0.05 in1.2 mm18%	Cloud 53%	Wind E 4 mph7 km/h	Sunday: Mostly cloudy and warm, with a high of 76°F24°C and morning low of 58°F15°C. Light wind from the E around 4 mph6 km/h. 18% chance of drizzle throughout the day. Dry air. Sunday Night: Mostly cloudy, with a low around 60°F16°C. Light wind from the ENE around 4 mph7 km/h. 17% chance of drizzle throughout the night.
Clear	High 80°F26°C	Low 56°F14°C	Precip 0.01 in0.2 mm3%	Cloud 29%	Wind E 4 mph7 km/h	Monday: Partly cloudy and warm, with a high of 80°F26°C and morning low of 56°F14°C. Light wind from the E around 4 mph6 km/h. Dry air. Monday Night: Partly cloudy, with a low around 59°F15°C. Light wind from the ENE around 5 mph7 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	TuesdaySep 22	69°F21°C	63°F17°C	0.01 in0.2 mm· 8%	85%	Cloudy	NE 7 mph12 km/h
DayOvercast and warm, with a high of 69°F21°C and morning low of 63°F17°C. Breezy from the NE at 7 mph11 km/h. NightMostly cloudy, with a low around 64°F18°C. Breezy from the NNE at 8 mph12 km/h.
	WednesdaySep 23	68°F20°C	59°F15°C	0.01 in0.2 mm· 7%	81%	Cloudy	NNE 7 mph11 km/h
DayOvercast and mild, with a high of 68°F20°C and morning low of 59°F15°C. Breezy from the NNE at 8 mph12 km/h. NightMostly cloudy, with a low around 60°F16°C. Breezy from the NNE at 6 to 7 mph10 to 11 km/h.
	ThursdaySep 24	71°F22°C	59°F15°C	0 in0 mm· —	81%	Cloudy	NE 5 mph8 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 59°F15°C. Light wind from the NNE around 5 mph8 km/h. NightMostly cloudy, with a low around 60°F16°C. Light wind from the NE around 5 mph7 km/h.
	FridaySep 25	75°F24°C	62°F17°C	0.01 in0.3 mm· 8%	84%	Cloudy	NE 4 mph7 km/h
DayOvercast and warm, with a high of 75°F24°C and morning low of 62°F17°C. Light wind from the NE around 4 mph7 km/h. NightOvercast, with a low around 62°F17°C. Light wind from the NE around 4 mph7 km/h.
	SaturdaySep 26	73°F23°C	58°F14°C	0.06 in1.4 mm· 21%	83%	Drizzle	E 4 mph7 km/h
DayOvercast and warm, with a high of 73°F23°C and morning low of 58°F14°C. Light wind from the E around 4 mph7 km/h. 21% chance of drizzle throughout the day. NightMostly cloudy, with a low around 60°F16°C. Light wind from the E around 5 mph7 km/h. 18% chance of drizzle in the evening.
	SundaySep 27	76°F24°C	58°F15°C	0.05 in1.2 mm· 18%	53%	Drizzle	E 4 mph7 km/h
DayMostly cloudy and warm, with a high of 76°F24°C and morning low of 58°F15°C. Light wind from the E around 4 mph6 km/h. 18% chance of drizzle throughout the day. Dry air. NightMostly cloudy, with a low around 60°F16°C. Light wind from the ENE around 4 mph7 km/h. 17% chance of drizzle throughout the night.
	MondaySep 28	80°F26°C	56°F14°C	0.01 in0.2 mm· 3%	29%	Clear	E 4 mph7 km/h
DayPartly cloudy and warm, with a high of 80°F26°C and morning low of 56°F14°C. Light wind from the E around 4 mph6 km/h. Dry air. NightPartly cloudy, with a low around 59°F15°C. Light wind from the ENE around 5 mph7 km/h.
	TuesdaySep 29	79°F26°C	58°F14°C	0.13 in3.2 mm· 27%	64%	Showers	SSE 6 mph10 km/h
DayMostly cloudy and warm, with a high of 79°F26°C and morning low of 58°F14°C. Breezy from the SSE at 6 to 7 mph10 to 11 km/h. 21% chance of drizzle throughout the day. NightMostly cloudy, with a low around 59°F15°C. Breezy from the SE at 6 to 7 mph10 to 12 km/h. 27% chance of showers in the evening.
	WednesdaySep 30	75°F24°C	62°F17°C	0.27 in6.9 mm· 31%	70%	Showers	SSW 7 mph12 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 62°F17°C. Breezy from the SW at 8 mph13 km/h. 31% chance of showers throughout the day. NightMostly cloudy, with a low around 64°F18°C. Breezy from the S at 7 mph11 km/h. 27% chance of light rain throughout the night.
	ThursdayOct 1	74°F23°C	59°F15°C	0.15 in3.9 mm· 19%	56%	Showers	W 7 mph11 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 59°F15°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 19% chance of showers throughout the day. NightMostly cloudy, with a low around 61°F16°C. Breezy from the WNW at 6 to 7 mph10 to 11 km/h. 19% chance of showers throughout the night.
	FridayOct 2	74°F23°C	58°F14°C	0.14 in3.5 mm· 18%	57%	Showers	ESE 7 mph11 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 58°F14°C. Breezy from the SSW at 7 to 8 mph11 to 12 km/h. 18% chance of showers throughout the day. NightMostly cloudy, with a low around 60°F15°C. Light wind from the E around 6 mph10 km/h. 17% chance of drizzle throughout the night.
	SaturdayOct 3	74°F23°C	59°F15°C	0.23 in5.8 mm· 21%	64%	Showers	SSE 7 mph11 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 59°F15°C. Breezy from the S at 7 to 8 mph12 to 13 km/h. 21% chance of showers throughout the day. NightMostly cloudy, with a low around 60°F16°C. Breezy from the SE at 7 mph11 km/h. 17% chance of showers throughout the night.
	SundayOct 4	74°F23°C	58°F14°C	0.07 in1.8 mm· 14%	50%	Drizzle	WNW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 58°F14°C. Breezy from the W at 7 to 8 mph11 to 13 km/h. 13% chance of drizzle throughout the day. NightPartly cloudy, with a low around 60°F16°C. Light wind from the WNW around 6 mph10 km/h. 14% chance of drizzle throughout the night.
	MondayOct 5	75°F24°C	57°F14°C	0.04 in1 mm· 10%	42%	Drizzle	SW 6 mph10 km/h
DayPartly cloudy and warm, with a high of 75°F24°C and morning low of 57°F14°C. Breezy from the WSW at 7 mph11 km/h. 10% chance of drizzle throughout the day. NightPartly cloudy, with a low around 58°F15°C. Light wind from the S around 6 mph10 km/h. 10% chance of drizzle in the evening.
	TuesdayOct 6	75°F24°C	57°F14°C	0.1 in2.6 mm· 14%	42%	Showers	SSW 7 mph11 km/h
DayPartly cloudy and warm, with a high of 75°F24°C and morning low of 57°F14°C. Breezy from the SW at 7 to 8 mph11 to 12 km/h. 14% chance of drizzle throughout the day. NightPartly cloudy, with a low around 59°F15°C. Breezy from the S at 6 to 7 mph10 to 11 km/h. 12% chance of showers throughout the night.

Nearby Cities

Upper Alton2 mi4 km Godfrey4 mi7 km Old Jamestown7 mi11 km Spanish Lake7 mi12 km Florissant10 mi16 km Ferguson12 mi19 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: 38.8906°N, 90.1843°W·Elevation: 150m·Timezone: America/Chicago·Population: 27,003