Ontario, California Weather:
Tuesday, September 1, 2026
Cloudy Weather
Day 95°
Night 68°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 9
Weather Forecast History
Last Year's Weather on This Day (September 1, 2025)
Rainy Night

Day

93°

Night

72°

Wind

5 mph

Precipitation

55 %