Ontario, California Weather:
Thursday, September 3, 2026
Sunny Weather
Day 95°
Night 66°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 8
Weather Forecast History
Last Year's Weather on This Day (September 3, 2025)
Night

Day

97°

Night

70°

Wind

5 mph

Precipitation

1 %