Ontario, California Weather:
Sunday, August 16, 2026
Sunny Weather
Day 90°
Night 64°
Precipitation 1 %
Wind 5 mph
UV Index (0 - 11+) 10
Weather Forecast History
Last Year's Weather on This Day (August 16, 2025)
Cloudy Weather

Day

82°

Night

61°

Wind

8 mph

UV Index

100

Precipitation

25 %