San Marcos, California Weather:
Tuesday, September 22, 2026
Cloudy Weather
Day 79°
Night 61°
Precipitation 1 %
Wind 6 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 22, 2025)
Cloudy Night

Day

82°

Night

63°

Wind

4 mph

Precipitation

2 %