The official National Weather Service forecast for Cambridge — 44.5727°N, 116.676°W, 33 miles from I-84. Forecasts here are written by NWS BOI, this county’s forecast office.
| Washington County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 39 | 49 | 57 | 67 | 77 | 89 | 87 | 76 | 60 | 44 | 35 | 60 |
| Avg low °F | 21 | 24 | 30 | 34 | 42 | 49 | 58 | 56 | 48 | 38 | 29 | 22 | 38 |
| Precip in | 2.8 | 2.1 | 2.3 | 1.7 | 2.0 | 1.3 | 0.3 | 0.4 | 0.7 | 1.4 | 2.1 | 3.4 | 20.5 |
1996–2025 normals for Washington County — the climate division Cambridge sits in. All-time county record high 105.4°F (2002-07-12); record low -21.4°F (1962-01-22). Source: NOAA / National Weather Service.