San Diego averages 4.2 days a year above 90°F, with February the wettest month at 2.2 in of normal rain. The hottest day on record was 107°F on Sep 4, 1988; the coldest, 33°F on Jan 5, 1971. The single biggest 24-hour rain event recorded was 2.73 in on Jan 22, 2024.
Climate and Average Weather Year Round in San Diego
Year-round temperature
In San Diego, the warmest months are July through October, with average daily highs between 75°F and 77°F. The coldest stretch runs December through February, with highs near 66°F and overnight lows reaching 50°F.
Rainfall through the year
Rainfall in San Diego averages 0.8 in per month over the long run. February is the wettest at 2.2 in, while August is the driest at 0.0 in.
Days at 90 °F or hotter
San Diego averages 4.2 days per year at 90 °F or hotter. The hottest year on record saw 13 such days (2014); the coolest just 1 (1992).
Precipitation this year
As of May 28, San Diego has received 5.3 in of precipitation this year — 18% below the long-term normal for this point in the year (6.5 in).