San Diego weather by month › September
San Diego in September: weather and what to expect
It’s fine, but not the best. March to April and October are more pleasant.
September weather in San Diego
Daytime high81°F 27°C
Night low64°F 18°C
Rain0.1 in 3 mm
AirA little humid
SunSunny
In September, San Diego averages highs of 81°F (27°C) and lows of 64°F (18°C), with 0.1 in (3 mm) of rain. The air feels a little humid and the sun is sunny. 1991–2020 averages, not a forecast.
Pack: light clothes and sun protection.
Places with the same weather in September
Match out of 100 for September, one city per country.
Jan · Feb · Mar · Apr · May · Jun · Jul · Aug · Sep · Oct · Nov · Dec