Current Conditions

Decatur, Illinois

79°F26°C

Drizzle

Wind

S 8 mph12 km/h

Humidity

52%

Cloud Cover

23%

As of Tuesday, September 8, 2026 at 9:26 PM CDT

Today's Outlook

Night

Mostly cloudy, with a low around 76°F24°C. Breezy from the SSW at 6 to 9 mph10 to 14 km/h. 30% chance of drizzle in the evening.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Drizzle	High 88°F31°CFeels 92°F33°C	Low 75°F24°C	Precip 0.03 in0.8 mm30%	Cloud 48%	Wind SW 6 mph10 km/h	Wednesday: Partly cloudy and hot, with a high of 88°F31°C and morning low of 75°F24°C. Breezy from the WSW at 6 to 8 mph10 to 12 km/h. 15% chance of drizzle in the afternoon. Humid. Wednesday Night: Mostly cloudy, with a low around 76°F24°C. Breezy from the SSW at 6 to 9 mph10 to 14 km/h. 30% chance of drizzle in the evening.
Rain	High 76°F25°C	Low 69°F21°C	Precip 0.89 in22.5 mm93%	Cloud 95%	Wind WNW 4 mph6 km/h	Thursday: Overcast and warm, with a high of 76°F25°C and morning low of 71°F22°C. Light wind from the W around 4 mph7 km/h. 93% chance of rain throughout the day. Heavy, humid air. Thursday Night: Overcast, with a low around 69°F21°C. Light wind from the N around 4 mph6 km/h. 90% chance of rain throughout the night.
Drizzle	High 82°F28°C	Low 65°F18°C	Precip 0.04 in0.9 mm22%	Cloud 57%	Wind ESE 5 mph8 km/h	Friday: Mostly cloudy and warm, with a high of 82°F28°C and morning low of 65°F18°C. Light wind from the ESE around 5 mph9 km/h. 22% chance of drizzle throughout the day. Humid. Friday Night: Partly cloudy, with a low around 66°F19°C. Light wind from the E around 5 mph8 km/h.
Drizzle	High 87°F30°CFeels 90°F32°C	Low 67°F20°C	Precip 0.04 in0.9 mm10%	Cloud 45%	Wind SW 5 mph9 km/h	Saturday: Mostly cloudy and hot, with a high of 87°F30°C and morning low of 67°F20°C. Light wind from the SW around 6 mph10 km/h. 10% chance of drizzle around midday. Humid. Saturday Night: Partly cloudy, with a low around 68°F20°C. Light wind from the SSW around 5 mph8 km/h.
Clear	High 83°F29°C	Low 66°F19°C	Precip 0.02 in0.6 mm6%	Cloud 32%	Wind N 6 mph10 km/h	Sunday: Partly cloudy and warm, with a high of 83°F29°C and morning low of 66°F19°C. Light wind from the N around 6 mph10 km/h. Sunday Night: Mostly clear, with a low around 69°F20°C. Light wind from the NNE around 6 mph9 km/h.
Drizzle	High 88°F31°C	Low 65°F19°C	Precip 0.03 in0.8 mm10%	Cloud 33%	Wind SE 10 mph16 km/h	Monday: Partly cloudy and hot, with a high of 88°F31°C and morning low of 65°F19°C. Breezy from the SSE at 10 to 12 mph16 to 19 km/h. 10% chance of drizzle in the morning. Monday Night: Partly cloudy, with a low around 67°F19°C. Breezy from the SE at 9 to 12 mph15 to 20 km/h.
Drizzle	High 88°F31°C	Low 72°F22°C	Precip 0.06 in1.5 mm19%	Cloud 45%	Wind SW 9 mph15 km/h	Tuesday: Partly cloudy and hot, with a high of 88°F31°C and morning low of 72°F22°C. Breezy from the SW at 9 to 10 mph15 to 16 km/h. 13% chance of drizzle throughout the day. Humid. Tuesday Night: Partly cloudy, with a low around 74°F24°C. Breezy from the SSW at 9 to 12 mph14 to 19 km/h. 19% chance of drizzle throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 9	88°F31°C Feels 92°F33°C	75°F24°C	0.03 in0.8 mm· 30%	48%	Drizzle	SW 6 mph10 km/h
DayPartly cloudy and hot, with a high of 88°F31°C and morning low of 75°F24°C. Breezy from the WSW at 6 to 8 mph10 to 12 km/h. 15% chance of drizzle in the afternoon. Humid. NightMostly cloudy, with a low around 76°F24°C. Breezy from the SSW at 6 to 9 mph10 to 14 km/h. 30% chance of drizzle in the evening.
	ThursdaySep 10	76°F25°C	69°F21°C	0.89 in22.5 mm· 93%	95%	Rain	WNW 4 mph6 km/h
DayOvercast and warm, with a high of 76°F25°C and morning low of 71°F22°C. Light wind from the W around 4 mph7 km/h. 93% chance of rain throughout the day. Heavy, humid air. NightOvercast, with a low around 69°F21°C. Light wind from the N around 4 mph6 km/h. 90% chance of rain throughout the night.
	FridaySep 11	82°F28°C	65°F18°C	0.04 in0.9 mm· 22%	57%	Drizzle	ESE 5 mph8 km/h
DayMostly cloudy and warm, with a high of 82°F28°C and morning low of 65°F18°C. Light wind from the ESE around 5 mph9 km/h. 22% chance of drizzle throughout the day. Humid. NightPartly cloudy, with a low around 66°F19°C. Light wind from the E around 5 mph8 km/h.
	SaturdaySep 12	87°F30°C Feels 90°F32°C	67°F20°C	0.04 in0.9 mm· 10%	45%	Drizzle	SW 5 mph9 km/h
DayMostly cloudy and hot, with a high of 87°F30°C and morning low of 67°F20°C. Light wind from the SW around 6 mph10 km/h. 10% chance of drizzle around midday. Humid. NightPartly cloudy, with a low around 68°F20°C. Light wind from the SSW around 5 mph8 km/h.
	SundaySep 13	83°F29°C	66°F19°C	0.02 in0.6 mm· 6%	32%	Clear	N 6 mph10 km/h
DayPartly cloudy and warm, with a high of 83°F29°C and morning low of 66°F19°C. Light wind from the N around 6 mph10 km/h. NightMostly clear, with a low around 69°F20°C. Light wind from the NNE around 6 mph9 km/h.
	MondaySep 14	88°F31°C	65°F19°C	0.03 in0.8 mm· 10%	33%	Drizzle	SE 10 mph16 km/h
DayPartly cloudy and hot, with a high of 88°F31°C and morning low of 65°F19°C. Breezy from the SSE at 10 to 12 mph16 to 19 km/h. 10% chance of drizzle in the morning. NightPartly cloudy, with a low around 67°F19°C. Breezy from the SE at 9 to 12 mph15 to 20 km/h.
	TuesdaySep 15	88°F31°C	72°F22°C	0.06 in1.5 mm· 19%	45%	Drizzle	SW 9 mph15 km/h
DayPartly cloudy and hot, with a high of 88°F31°C and morning low of 72°F22°C. Breezy from the SW at 9 to 10 mph15 to 16 km/h. 13% chance of drizzle throughout the day. Humid. NightPartly cloudy, with a low around 74°F24°C. Breezy from the SSW at 9 to 12 mph14 to 19 km/h. 19% chance of drizzle throughout the night.
	WednesdaySep 16	85°F29°C	68°F20°C	0.19 in4.9 mm· 37%	58%	Showers	E 7 mph11 km/h
DayMostly cloudy and warm, with a high of 85°F29°C and morning low of 68°F20°C. Breezy from the ESE at 7 mph11 km/h. 37% chance of showers throughout the day. Humid. NightMostly cloudy, with a low around 70°F21°C. Breezy from the E at 7 to 8 mph11 to 13 km/h. 30% chance of showers throughout the night.
	ThursdaySep 17	84°F29°C	70°F21°C	0.15 in3.9 mm· 20%	49%	Showers	SSW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 84°F29°C and morning low of 70°F21°C. Breezy from the SSW at 9 to 10 mph15 to 16 km/h. 20% chance of showers throughout the day. Humid. NightPartly cloudy, with a low around 71°F22°C. Breezy from the SSE at 8 mph13 km/h. 19% chance of drizzle throughout the night.
	FridaySep 18	78°F26°C	65°F18°C	0.13 in3.4 mm· 15%	51%	Showers	WNW 8 mph14 km/h
DayMostly cloudy and warm, with a high of 78°F26°C and morning low of 65°F18°C. Breezy from the W at 9 mph14 km/h. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 66°F19°C. Breezy from the NW at 8 to 9 mph13 to 14 km/h. 15% chance of showers throughout the night.
	SaturdaySep 19	75°F24°C	59°F15°C	0.16 in4.1 mm· 17%	51%	Showers	NNW 8 mph12 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 59°F15°C. Breezy from the NNW at 8 to 9 mph13 to 14 km/h. 16% chance of showers throughout the day. NightMostly cloudy, with a low around 61°F16°C. Breezy from the N at 7 to 8 mph12 to 12 km/h. 17% chance of showers throughout the night.
	SundaySep 20	73°F23°C	56°F13°C	0.12 in3.1 mm· 18%	49%	Showers	N 8 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 56°F13°C. Breezy from the N at 8 to 9 mph13 to 15 km/h. 18% chance of drizzle throughout the day. NightPartly cloudy, with a low around 58°F14°C. Breezy from the NNE at 7 to 8 mph12 to 12 km/h. 13% chance of showers throughout the night.
	MondaySep 21	72°F22°C	53°F12°C	0.11 in2.8 mm· 13%	52%	Showers	ENE 8 mph12 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 53°F12°C. Breezy from the ENE at 8 to 9 mph13 to 14 km/h. 13% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 56°F13°C. Breezy from the ENE at 7 to 8 mph12 to 12 km/h. 13% chance of drizzle throughout the night.
	TuesdaySep 22	72°F22°C	54°F12°C	0.09 in2.4 mm· 13%	56%	Drizzle	ESE 8 mph13 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 54°F12°C. Breezy from the ESE at 9 mph14 km/h. 12% chance of drizzle throughout the day. Dry air. NightMostly cloudy, with a low around 56°F13°C. Breezy from the E at 7 to 8 mph12 to 12 km/h. 13% chance of drizzle throughout the night.
	WednesdaySep 23	73°F23°C	56°F13°C	0.11 in2.8 mm· 17%	56%	Showers	ESE 8 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 56°F13°C. Breezy from the SE at 8 to 9 mph13 to 14 km/h. 17% chance of showers throughout the day. NightMostly cloudy, with a low around 57°F14°C. Breezy from the ESE at 7 to 8 mph12 to 12 km/h. 16% chance of drizzle throughout the night.

Nearby Cities

Springfield37 mi59 km Mattoon40 mi64 km Champaign42 mi68 km Urbana44 mi70 km Bloomington45 mi72 km Normal47 mi75 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: 39.8403°N, 88.9548°W·Elevation: 205m·Timezone: America/Chicago·Population: 73,254