Ontario, California Weather:
Saturday, August 15, 2026
Sunny Weather
Day 90°
Night 64°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 10
Weather Forecast History
Last Year's Weather on This Day (August 15, 2025)
Cloudy Night

Day

84°

Night

61°

Wind

6 mph

Precipitation

0 %