The official National Weather Service forecast for Mammoth — 32.7226°N, 110.6406°W, 39.5 miles from I-10. Forecasts here are written by NWS PSR, this county’s forecast office.
| Pinal County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 65 | 68 | 75 | 83 | 92 | 101 | 102 | 100 | 96 | 86 | 74 | 64 | 84 |
| Avg low °F | 39 | 41 | 46 | 51 | 60 | 70 | 76 | 75 | 69 | 57 | 46 | 39 | 56 |
| Precip in | 1.1 | 1.1 | 0.8 | 0.3 | 0.1 | 0.2 | 1.7 | 1.7 | 1.1 | 0.6 | 0.6 | 1.1 | 10.4 |
1996–2025 normals for Pinal County — the climate division Mammoth sits in. All-time county record high 115.8°F (1995-07-29); record low 17.7°F (2011-02-04). Source: NOAA / National Weather Service.