Weather in Sullivan, IL
Updated 2026-09-26 10:00 local time · ZIP codes 61951
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
64°13% rain67°11% rain
69°6% rain
72°3% rain73°2% rain
74°2% rain74°6% rain73°7% rain72°9% rain
67°11% rain65°12% rain63°11% 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 13%).
It feels like 59°F with winds near 8 mph.
72°F, 3% rain chance and 6 mph wind.
Visibility is around 6 mi; gusts may reach 17 mph.
Current temperature is 64°F, wind 8 mph, rain chance up to 13%.
UV index is 2.
Local weather characteristics in Sullivan
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Sullivan is part of the Midwest weather region. The forecast point is near 39.60°N latitude and 88.61°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.
Sullivan weather today
Overcast and 64°F in Sullivan, IL. Today's high is 74°F with a 8% rain chance. Winds are around 8 mph with gusts near 9 mph. Relative humidity is 53%, pressure is 30.17 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Sullivan
Sunrise is at 06:45 AM and sunset is at 06:45 PM. Tomorrow's forecast calls for Overcast with a high near 75°F and a low near 55°F. The maximum rain chance is 7%.