Ontario, California Weather:
Thursday, May 28, 2026
Cloudy Weather
Day 79°
Night 55°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (May 28, 2025)
Cloudy Weather

Day

75°

Night

55°

Wind

8 mph

UV Index

12

Precipitation

25 %