The official National Weather Service forecast for Westerly — 41.3776°N, 71.8273°W, population 30,955, 4.5 miles from I-95.
| Washington County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 41 | 48 | 58 | 67 | 76 | 82 | 81 | 74 | 64 | 53 | 44 | 61 |
| Avg low °F | 22 | 24 | 30 | 38 | 48 | 57 | 64 | 62 | 56 | 45 | 35 | 28 | 42 |
| Precip in | 3.9 | 3.4 | 4.7 | 4.4 | 4.0 | 3.8 | 3.3 | 3.6 | 4.0 | 4.8 | 3.6 | 4.7 | 48.2 |
1996–2025 normals for Washington County — the climate division Westerly sits in. All-time county record high 97.4°F (2025-06-25); record low -8.3°F (1980-12-26). Source: NOAA / National Weather Service.