National City, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 55.8 °F (low) to 70.5 °F (high). Annual precipitation averages 9.6 Inches. National City is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 47.8 °F | 66.3 °F | 1.76 in. |
| February | 48.8 °F | 65.9 °F | 2.34 in. |
| March | 51.2 °F | 66.3 °F | 1.54 in. |
| April | 53.7 °F | 68.1 °F | 0.71 in. |
| May | 57.8 °F | 69.4 °F | 0.23 in. |
| June | 60.7 °F | 71.0 °F | 0.05 in. |
| July | 64.0 °F | 74.3 °F | 0.06 in. |
| August | 65.1 °F | 76.5 °F | 0.02 in. |
| September | 63.6 °F | 76.6 °F | 0.1 in. |
| October | 58.3 °F | 74.3 °F | 0.38 in. |
| November | 52.2 °F | 71.0 °F | 0.75 in. |
| December | 46.9 °F | 65.8 °F | 1.68 in. |
| Annual | 55.8 °F | 70.5 °F | 9.62 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 |