Climate in San Diego

San Diego, United States has a desert climate. The annual average temperature is about 22.8°C and the city receives roughly 121 mm of precipitation across 11 rainy days a year, with around 3632 hours of sunshine. The warmest month is Jul (highs near 37.1°C) and the coldest is Jan (lows near 8.5°C). These are deterministic, latitude- and region-based planning estimates — not a forecast or measured station data; check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

San Diego is classified as Desert. This reflects its annual temperature range and the seasonal pattern of its rainfall.

San Diego receives about 121 mm of precipitation a year over roughly 11 rainy days. The wettest month is Jan and the driest is Jul.

San Diego sees an estimated 3632 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in San Diego are Jan, Feb, Dec. Conditions vary year to year — verify with a current forecast before booking.

San Diego has a climate comfort score of 58/100, a moderate year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.

• Climate in Los Angeles — Desert, comfort 63/100
• Climate in San Francisco — Mediterranean, comfort 96/100
• Climate in Phoenix — Desert, comfort 63/100