Ontario, California Weather:
Wednesday, May 27, 2026
Sunny 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 27, 2025)
Cloudy Weather

Day

81°

Night

57°

Wind

7 mph

UV Index

12

Precipitation

0 %