Ontario, California Weather:
Tuesday, March 31, 2026
Sunny Weather
Day 77°
Night 50°
Precipitation 20 %
Wind 4 mph
UV Index (0 - 11+) 8
Weather Forecast History
Last Year's Weather on This Day (March 31, 2025)
Cloudy Weather

Day

64°

Night

48°

Wind

9 mph

UV Index

2

Precipitation

25 %