Rancho Cucamonga, California Weather:
Sunday, May 17, 2026
Cloudy Weather
Day 73°
Night 54°
Precipitation 5 %
Wind 10 mph
UV Index (0 - 11+) 10
Weather Forecast History
Last Year's Weather on This Day (May 17, 2025)
Rainy Weather

Day

64°

Night

55°

Wind

11 mph

UV Index

3

Precipitation

55 %