Weather in Rancho Cucamonga, CA
Updated 2026-08-11 10:45 local time · ZIP codes 91701, 91730, 91737, 91739
Partly cloudy
No government weather alerts were returned for this location at the latest update.
Next hours
80°1% rain
97°0% rain95°0% rain101°0% rain99°0% rain98°1% rain94°1% rain89°1% rain84°1% rain
78°3% rain74°5% rain75°2% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 5%).
It feels like 79°F with winds near 4 mph.
78°F, 3% rain chance and 7 mph wind.
Visibility is around 10 mi; gusts may reach 13 mph.
Current temperature is 80°F, wind 4 mph, rain chance up to 5%.
UV index is 5. Sunscreen and sunglasses are sensible for longer outdoor time.
Rancho Cucamonga weather today
Partly cloudy and 80°F in Rancho Cucamonga, CA. Today's high is 101°F with a 1% rain chance. Winds are around 4 mph with gusts near 4 mph. Relative humidity is 51%, pressure is 30.02 inHg, and visibility is about 10 miles.
Tonight and tomorrow in Rancho Cucamonga
Sunrise is at 06:08 AM and sunset is at 07:42 PM. Tomorrow's forecast calls for Sunny with a high near 85°F and a low near 68°F. The maximum rain chance is 2%.