Ontario, California Weather:
Monday, April 20, 2026
Cloudy Weather
Day 72°
Night 48°
Precipitation 20 %
Wind 2 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (April 20, 2025)
Sunny Weather

Day

79°

Night

54°

Wind

7 mph

UV Index

10

Precipitation

1 %