Weather in Ontario, WI
Updated 2026-09-26 10:00 local time · ZIP codes 54651
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
56°15% rain59°13% rain62°12% rain63°12% rain64°11% rain65°11% rain64°12% rain63°13% rain62°16% rain
62°17% rain60°19% rain58°23% 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 23%).
It feels like 49°F with winds near 10 mph.
65°F, 11% rain chance and 10 mph wind.
Visibility is around 6 mi; gusts may reach 16 mph.
Current temperature is 56°F, wind 10 mph, rain chance up to 23%.
UV index is 2.
Local weather characteristics in Ontario
Wisconsin has warm summers, cold winters and strong Great Lakes influence near Lakes Michigan and Superior. Lake-effect snow can be important in favored areas.
Ontario is part of the Midwest weather region. The forecast point is near 43.73°N latitude and 90.59°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.
Ontario weather today
Overcast and 56°F in Ontario, WI. Today's high is 65°F with a 17% rain chance. Winds are around 10 mph with gusts near 16 mph. Relative humidity is 60%, pressure is 30.22 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Ontario
Sunrise is at 06:54 AM and sunset is at 06:53 PM. Tomorrow's forecast calls for Overcast with a high near 63°F and a low near 56°F. The maximum rain chance is 11%.