Ontario, California Weather:
Friday, May 1, 2026
Cloudy Weather
Day 73°
Night 55°
Precipitation 3 %
Wind 6 mph
UV Index (0 - 11+) 10
Weather Forecast History
Last Year's Weather on This Day (May 1, 2025)
Sunny with a Chance of Thunderstorms

Day

70°

Night

54°

Wind

7 mph

UV Index

10

Precipitation

40 %