Imperial Beach, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 13.2 °C (low) to 20.9 °C (high). Annual precipitation averages 230.6 Millimeters. Imperial Beach is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.7 °C | 19.1 °C | 42.67 mm |
| February | 9.2 °C | 18.7 °C | 54.86 mm |
| March | 10.6 °C | 18.9 °C | 37.85 mm |
| April | 12.1 °C | 19.2 °C | 17.78 mm |
| May | 14.3 °C | 20.5 °C | 4.57 mm |
| June | 15.9 °C | 21.3 °C | 1.02 mm |
| July | 17.8 °C | 22.8 °C | 1.78 mm |
| August | 18.3 °C | 23.7 °C | 0.51 mm |
| September | 17.4 °C | 23.8 °C | 2.29 mm |
| October | 14.4 °C | 22.6 °C | 9.4 mm |
| November | 11.1 °C | 21.6 °C | 18.29 mm |
| December | 8.1 °C | 18.7 °C | 39.62 mm |
| Annual | 13.2 °C | 20.9 °C | 230.64 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |