The official National Weather Service forecast for Bellfountain — 44.3637°N, 123.3554°W, 18.4 miles from I-5. Forecasts here are written by NWS PQR, this county’s forecast office.
| Benton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 47 | 50 | 54 | 60 | 67 | 73 | 82 | 83 | 76 | 63 | 52 | 46 | 63 |
| Avg low °F | 35 | 35 | 37 | 39 | 44 | 48 | 52 | 53 | 49 | 43 | 39 | 35 | 42 |
| Precip in | 9.4 | 7.2 | 7.4 | 4.5 | 2.8 | 1.5 | 0.3 | 0.4 | 1.7 | 4.7 | 8.9 | 11.1 | 59.9 |
1996–2025 normals for Benton County — the climate division Bellfountain sits in. All-time county record high 108.4°F (2021-06-28); record low 1.4°F (1972-12-09). Source: NOAA / National Weather Service.