San Diego Climate by Month
San Diego, California, United States
Mild all year, with little rain, mostly from December to March.
The climate in San Diego is mild all year, with little rain, mostly from December to March. Afternoon highs range from 68°F (20°C) in February to 81°F (27°C) in September, and December nights average 47°F (9°C). It gets only 10 in (254 mm) of rain a year. May to September are almost completely dry.
- Warmest month
- 81°F(27°C)
- Average high, September
- Coldest nights
- 47°F(9°C)
- Average low, December
- Rain per year
- 10 in(254 mm)
- Wettest: February
- Humidity
- 60%
- Sunniest: June
Best and worst months in San Diego
Best for weatherMay and June are the best time for weather in San Diego: highs near 74°F (23°C) and almost no rain.
Least pleasantJanuary and February are the least pleasant; February is the coldest, with highs of only 68°F (20°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Diego weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 69°F(20°C) | 48°F(9°C) | 1.8 in(46 mm) | 54% | 3.0 |
| FebFebruary | 68°F(20°C) | 49°F(9°C) | 2.2 in(56 mm) | 60% | 3.5 |
| MarMarch | 69°F(21°C) | 51°F(11°C) | 1.6 in(41 mm) | 62% | 4.9 |
| AprApril | 72°F(22°C) | 53°F(12°C) | 0.8 in(21 mm) | 62% | 6.0 |
| MayMayBest | 73°F(23°C) | 58°F(14°C) | 0.2 in(6 mm) | 61% | 6.2 |
| JunJuneBest | 75°F(24°C) | 61°F(16°C) | 0.1 in(2 mm) | 65% | 6.7 |
| JulJuly | 78°F(26°C) | 64°F(18°C) | 0.1 in(2 mm) | 65% | 6.6 |
| AugAugust | 80°F(27°C) | 65°F(19°C) | 0.0 in(1 mm) | 65% | 6.5 |
| SepSeptember | 81°F(27°C) | 64°F(18°C) | 0.1 in(3 mm) | 63% | 5.5 |
| OctOctober | 78°F(26°C) | 59°F(15°C) | 0.4 in(11 mm) | 55% | 4.2 |
| NovNovember | 74°F(23°C) | 52°F(11°C) | 0.9 in(24 mm) | 51% | 3.4 |
| DecDecember | 69°F(20°C) | 47°F(9°C) | 1.6 in(41 mm) | 55% | 2.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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