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Ontario, California Weather:
Monday, January 19, 2026
Sunny Weather
Day 70°
Night 46°
Precipitation 20 %
Wind 6 mph
UV Index (0 - 11+) 3
Weather Forecast History
Last Year's Weather on This Day (January 19, 2025)
Partly Sunny with Showers

Day

57°

Night

43°

Wind

4 mph

UV Index

3

Precipitation

55 %