
| Month | Low | High | 
|---|---|---|
| Jan | 49.7°F | 65.8°F | 
| Feb | 51.5°F | 66.3°F | 
| Mar | 53.6°F | 66.3°F | 
| Apr | 56.4°F | 68.7°F | 
| May | 59.8°F | 69.3°F | 
| Jun | 62.6°F | 72.2°F | 
| Jul | 65.9°F | 75.8°F | 
| Aug | 67.4°F | 77.5°F | 
| Sept | 66.1°F | 77.0°F | 
| Oct | 61.2°F | 74.0°F | 
| Nov | 53.6°F | 69.9°F | 
| Dec | 48.9°F | 66.3°F | 
San Diego's coldest month is December when the average temperature overnight is 48.9°F. In August, the warmest month, the average day time temperature rises to 77.5°F.

| Month | Precipitation | 
|---|---|
| Jan | 2.28in. | 
| Feb | 2.04in. | 
| Mar | 2.26in. | 
| Apr | 0.75in. | 
| May | 0.20in. | 
| Jun | 0.09in. | 
| Jul | 0.03in. | 
| Aug | 0.09in. | 
| Sept | 0.21in. | 
| Oct | 0.44in. | 
| Nov | 1.07in. | 
| Dec | 1.31in. | 
The driest month in San Diego is July with 0.03 inches of precipitation, and with 2.28 inches January is the wettest month.