The official National Weather Service forecast for Somerville — 35.2437°N, 89.3501°W, 11.2 miles from I-40.
| Fayette County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 50 | 54 | 64 | 73 | 81 | 88 | 90 | 90 | 85 | 74 | 62 | 53 | 72 |
| Avg low °F | 31 | 34 | 42 | 49 | 59 | 67 | 70 | 69 | 62 | 50 | 40 | 34 | 51 |
| Precip in | 4.5 | 5.0 | 5.9 | 5.6 | 5.6 | 4.4 | 4.2 | 3.5 | 3.9 | 3.9 | 4.1 | 5.4 | 56.0 |
1996–2025 normals for Fayette County — the climate division Somerville sits in. All-time county record high 105.3°F (1952-07-28); record low -10.6°F (1951-02-02). Source: NOAA / National Weather Service.