Amesti, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.9 °F (low) to 67.7 °F (high). Annual precipitation averages 26.5 Inches. Amesti is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.2 °F | 60.5 °F | 5.37 in. |
| February | 42.3 °F | 61.3 °F | 5.38 in. |
| March | 43.4 °F | 63.5 °F | 3.6 in. |
| April | 44.7 °F | 66.4 °F | 1.87 in. |
| May | 48.0 °F | 69.2 °F | 0.71 in. |
| June | 50.5 °F | 71.7 °F | 0.17 in. |
| July | 53.3 °F | 72.4 °F | 0.03 in. |
| August | 53.8 °F | 73.4 °F | 0.07 in. |
| September | 52.4 °F | 74.8 °F | 0.1 in. |
| October | 48.8 °F | 73.5 °F | 1.22 in. |
| November | 44.1 °F | 65.8 °F | 2.66 in. |
| December | 40.4 °F | 60.2 °F | 5.34 in. |
| Annual | 46.9 °F | 67.7 °F | 26.52 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |