San Luis, Arizona has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 58.4 °F (low) to 87.7 °F (high). Annual precipitation averages 3 Inches. San Luis is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.5 °F | 69.7 °F | 0.39 in. |
| February | 44.9 °F | 73.1 °F | 0.45 in. |
| March | 49.7 °F | 79.4 °F | 0.33 in. |
| April | 54.3 °F | 85.2 °F | 0.12 in. |
| May | 60.7 °F | 93.1 °F | 0.05 in. |
| June | 68.6 °F | 101.9 °F | 0.02 in. |
| July | 77.5 °F | 105.8 °F | 0.23 in. |
| August | 78.8 °F | 105.8 °F | 0.32 in. |
| September | 72.6 °F | 101.3 °F | 0.37 in. |
| October | 60.2 °F | 90.7 °F | 0.13 in. |
| November | 48.9 °F | 78.1 °F | 0.21 in. |
| December | 41.6 °F | 67.9 °F | 0.4 in. |
| Annual | 58.4 °F | 87.7 °F | 3.02 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 | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |