San Manuel, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 11.8 °C (low) to 26.9 °C (high). Annual precipitation averages 327.9 Millimeters. San Manuel is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.8 °C | 16.8 °C | 27.94 mm |
| February | 4.2 °C | 18.4 °C | 27.43 mm |
| March | 6.9 °C | 22.1 °C | 19.3 mm |
| April | 9.8 °C | 26.2 °C | 9.14 mm |
| May | 14.3 °C | 31.2 °C | 8.13 mm |
| June | 19.7 °C | 36.6 °C | 8.13 mm |
| July | 21.9 °C | 36.6 °C | 61.98 mm |
| August | 21 °C | 35.3 °C | 72.39 mm |
| September | 18.5 °C | 33.2 °C | 33.27 mm |
| October | 12.8 °C | 28.2 °C | 15.24 mm |
| November | 6.8 °C | 21.8 °C | 16 mm |
| December | 2.6 °C | 16.2 °C | 28.96 mm |
| Annual | 11.8 °C | 26.9 °C | 327.91 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |