Ontario, California Weather:
Saturday, May 9, 2026
Sunny Weather
Day 77°
Night 54°
Precipitation 5 %
Wind 1 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (May 9, 2025)
Sunny Weather

Day

97°

Night

66°

Wind

6 mph

UV Index

11

Precipitation

0 %