Sunnyvale, California Weather:
Thursday, September 17, 2026
Cloudy Weather
Day 77°
Night 55°
Precipitation 2 %
Wind 5 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (September 17, 2025)
Cloudy Night

Day

88°

Night

64°

Wind

5 mph

Precipitation

1 %