The official National Weather Service forecast for Nantucket — 41.2835°N, 70.0995°W, population 12,011, 46.1 miles from I-195.
| Nantucket County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 41 | 45 | 53 | 61 | 69 | 76 | 76 | 71 | 62 | 53 | 45 | 58 |
| Avg low °F | 27 | 27 | 32 | 39 | 48 | 56 | 63 | 63 | 58 | 49 | 39 | 32 | 44 |
| Precip in | 3.9 | 3.3 | 3.9 | 3.9 | 3.4 | 3.1 | 2.4 | 3.1 | 4.0 | 4.5 | 3.6 | 4.0 | 43.1 |
1996–2025 normals for Nantucket County — the climate division Nantucket sits in. All-time county record high 93.8°F (1991-07-22); record low -7.6°F (2023-02-05). Source: NOAA / National Weather Service.