Weather in Flat Rock, IL
Updated 2026-09-26 10:45 local time · ZIP codes 62427
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
69°10% rain72°10% rain
74°7% rain
76°1% rain
77°3% rain77°1% rain75°1% rain71°9% rain
67°10% rain65°10% rain64°10% rain62°12% 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 12%).
It feels like 64°F with winds near 6 mph.
75°F, 1% rain chance and 9 mph wind.
Visibility is around 6 mi; gusts may reach 20 mph.
Current temperature is 69°F, wind 6 mph, rain chance up to 12%.
UV index is 5. Sunscreen and sunglasses are sensible for longer outdoor time.
Local weather characteristics in Flat Rock
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Flat Rock is part of the Midwest weather region. The forecast point is near 38.90°N latitude and 87.67°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.
Flat Rock weather today
Overcast and 69°F in Flat Rock, IL. Today's high is 77°F with a 8% rain chance. Winds are around 6 mph with gusts near 7 mph. Relative humidity is 39%, pressure is 30.16 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Flat Rock
Sunrise is at 06:42 AM and sunset is at 06:41 PM. Tomorrow's forecast calls for Overcast with a high near 76°F and a low near 54°F. The maximum rain chance is 10%.