San Pablo, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 50.1 °F (low) to 66.6 °F (high). Annual precipitation averages 23.6 Inches. San Pablo is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.8 °F | 56.4 °F | 4.71 in. |
| February | 45.3 °F | 60.1 °F | 4.85 in. |
| March | 46.9 °F | 63.2 °F | 3.38 in. |
| April | 48.6 °F | 65.7 °F | 1.43 in. |
| May | 51.2 °F | 68.8 °F | 0.74 in. |
| June | 53.9 °F | 72.1 °F | 0.18 in. |
| July | 55.4 °F | 72.4 °F | 0.0 in. |
| August | 56.1 °F | 73.2 °F | 0.04 in. |
| September | 55.6 °F | 74.7 °F | 0.08 in. |
| October | 52.7 °F | 72.4 °F | 0.96 in. |
| November | 48.0 °F | 63.8 °F | 2.37 in. |
| December | 43.8 °F | 56.8 °F | 4.9 in. |
| Annual | 50.1 °F | 66.6 °F | 23.64 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |