Ontario, California Weather:
Thursday, June 18, 2026
Cloudy Weather
Day 88°
Night 57°
Precipitation 25 %
Wind 2 mph
UV Index (0 - 11+) 3
Weather Forecast History
Last Year's Weather on This Day (June 18, 2025)
Sunny Weather

Day

93°

Night

63°

Wind

7 mph

UV Index

12

Precipitation

0 %