The official National Weather Service forecast for Big Sandy — 36.2348°N, 88.0853°W, 25.4 miles from I-40.
| Benton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 48 | 53 | 62 | 72 | 79 | 86 | 89 | 89 | 83 | 73 | 61 | 52 | 71 |
| Avg low °F | 29 | 32 | 39 | 47 | 57 | 65 | 69 | 67 | 60 | 48 | 38 | 32 | 49 |
| Precip in | 4.5 | 4.7 | 5.2 | 5.2 | 5.3 | 4.4 | 4.2 | 3.6 | 3.7 | 3.5 | 4.0 | 4.8 | 53.1 |
1996–2025 normals for Benton County — the climate division Big Sandy sits in. All-time county record high 106.3°F (1952-07-28); record low -19.9°F (1963-01-24). Source: NOAA / National Weather Service.