Weather in Potomac, IL
Updated 2026-09-26 10:00 local time · ZIP codes 61865
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
60°14% rain63°12% rain65°11% rain67°10% rain68°10% rain69°10% rain69°10% rain68°12% rain67°14% rain
63°15% rain62°15% rain61°16% 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 16%).
It feels like 54°F with winds near 8 mph.
69°F, 10% rain chance and 4 mph wind.
Visibility is around 6 mi; gusts may reach 11 mph.
Current temperature is 60°F, wind 8 mph, rain chance up to 16%.
UV index is 3.
Local weather characteristics in Potomac
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Potomac is part of the Midwest weather region. The forecast point is near 40.30°N latitude and 87.80°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.
Potomac weather today
Overcast and 60°F in Potomac, IL. Today's high is 69°F with a 11% rain chance. Winds are around 8 mph with gusts near 11 mph. Relative humidity is 57%, pressure is 30.19 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Potomac
Sunrise is at 06:42 AM and sunset is at 06:42 PM. Tomorrow's forecast calls for Overcast with a high near 70°F and a low near 53°F. The maximum rain chance is 10%.