Imperial Beach, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 55.7 °F (low) to 69.6 °F (high). Annual precipitation averages 9.1 Inches. Imperial Beach is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 47.7 °F | 66.3 °F | 1.68 in. |
| February | 48.6 °F | 65.7 °F | 2.16 in. |
| March | 51.0 °F | 66.0 °F | 1.49 in. |
| April | 53.7 °F | 66.5 °F | 0.7 in. |
| May | 57.8 °F | 68.9 °F | 0.18 in. |
| June | 60.7 °F | 70.4 °F | 0.04 in. |
| July | 64.0 °F | 73.0 °F | 0.07 in. |
| August | 64.9 °F | 74.7 °F | 0.02 in. |
| September | 63.3 °F | 74.9 °F | 0.09 in. |
| October | 57.9 °F | 72.6 °F | 0.37 in. |
| November | 52.0 °F | 70.8 °F | 0.72 in. |
| December | 46.6 °F | 65.6 °F | 1.56 in. |
| Annual | 55.7 °F | 69.6 °F | 9.08 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10b : 35°F to 30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |