Weather in Decatur, IL
Updated 2026-09-26 08:00 local time · ZIP codes 62521, 62522, 62523, 62526
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
57°18% rain60°14% rain63°12% rain
66°8% rain69°10% rain70°9% rain71°9% rain72°9% rain71°9% rain71°9% rain70°10% rain
68°10% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 18%).
It feels like 53°F with winds near 6 mph.
70°F, 9% rain chance and 3 mph wind.
Visibility is around 6 mi; gusts may reach 15 mph.
Current temperature is 57°F, wind 6 mph, rain chance up to 18%.
UV index is 0.
Local weather characteristics in Decatur
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Decatur is part of the Midwest weather region. The forecast point is near 39.84°N latitude and 88.95°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Decatur weather today
Overcast and 57°F in Decatur, IL. Today's high is 72°F with a 11% rain chance. Winds are around 6 mph with gusts near 14 mph. Relative humidity is 70%, pressure is 30.17 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Decatur
Sunrise is at 06:47 AM and sunset is at 06:46 PM. Tomorrow's forecast calls for Overcast with a high near 74°F and a low near 57°F. The maximum rain chance is 8%.