Weather in Ontario, CA
Updated 2026-09-26 09:45 local time · ZIP codes 91761, 91762, 91764
Partly Cloudy
No government weather alerts were returned for this location at the latest update.
Next hours
76°4% rain
84°1% rain86°1% rain88°1% rain89°1% rain89°2% rain89°1% rain
87°9% rain
84°7% rain
81°9% rain80°9% rain78°10% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Today vs yesterday in Ontario
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 10%).
It feels like 76°F with winds near 2 mph.
80°F, 1% rain chance and 1 mph wind.
Visibility is around 6 mi; gusts may reach 21 mph.
Current temperature is 76°F, wind 2 mph, rain chance up to 10%.
UV index is 2.
Local weather characteristics in Ontario
California weather varies from cool marine conditions along parts of the Pacific coast to hot inland valleys, deserts and snowy mountain climates. Short distances can produce large temperature differences.
Ontario is part of the West weather region. The forecast point is near 34.06°N latitude and 117.65°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
Partly Cloudy and 76°F in Ontario, CA. Today's high is 89°F with a 5% rain chance. Winds are around 2 mph with gusts near 3 mph. Relative humidity is 48%, pressure is 29.89 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Ontario
Sunrise is at 06:41 AM and sunset is at 06:42 PM. Tomorrow's forecast calls for Overcast with a high near 85°F and a low near 71°F. The maximum rain chance is 6%.