Ontario, California Weather:
Sunday, August 30, 2026
Sunny Weather
Day 99°
Night 70°
Precipitation 2 %
Wind 7 mph
UV Index (0 - 11+) 9
Weather Forecast History
Last Year's Weather on This Day (August 30, 2025)
Night

Day

93°

Night

68°

Wind

5 mph

Precipitation

0 %