Weather in Ottawa, IL
Updated 2026-09-26 11:45 local time · ZIP codes 61350
Cloudy
No government weather alerts were returned for this location at the latest update.
Next hours
61°10% rain
67°9% rain69°10% rain69°10% rain69°10% rain68°11% rain66°13% rain
63°14% rain61°14% rain60°15% rain58°15% rain57°15% 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 15%).
It feels like 56°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 61°F, wind 8 mph, rain chance up to 15%.
UV index is 4. Sunscreen and sunglasses are sensible for longer outdoor time.
Local weather characteristics in Ottawa
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Ottawa is part of the Midwest weather region. The forecast point is near 41.35°N latitude and 88.84°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.
Ottawa weather today
Cloudy and 61°F in Ottawa, IL. Today's high is 69°F with a 10% rain chance. Winds are around 8 mph with gusts near 10 mph. Relative humidity is 57%, pressure is 30.20 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Ottawa
Sunrise is at 06:47 AM and sunset is at 06:46 PM. Tomorrow's forecast calls for Cloudy with a high near 71°F and a low near 52°F. The maximum rain chance is 10%.