Ontario, California Weather:
Monday, July 20, 2026
Cloudy Weather
Day 90°
Night 66°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Cloudy Night

Day

82°

Night

61°

Wind

7 mph

Precipitation

1 %