SeasonMapNantucket weather by month
United States
The best time to visit Nantucket is June to August — 87/100 in August, 25°C and 6 rainy days. The best season is summer, June to August (84/100 on average).
The worst month is January at 36/100 — freezing, rainy, clean air. See January →
Updated September 2026 · climate normals from ERA5 reanalysis
Planning the wider trip? Best time to visit United States →
Nantucket, month by month
Comfort score out of 100 for the kind of trip Nantucket is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.
| Month | Score | Tier | High | Rain | Sun | Crowds | On |
|---|---|---|---|---|---|---|---|
| JanJanuary | 36 | F | 5°C | 8 d | 6 h | Busy | 2 |
| FebFebruary | 42 | F | 6°C | 8 d | 6 h | Quiet | 2 |
| MarMarch | 49 | F | 8°C | 7 d | 8 h | Busy | 2 |
| AprApril | 62 | C | 12°C | 9 d | 9 h | Busy | 3 |
| MayMay | 72 | B | 16°C | 9 d | 10 h | Peak | 4 |
| JunJune | 79 | B | 21°C | 6 d | 11 h | Peak | 3 |
| JulJuly | 85 | A | 25°C | 4 d | 12 h | Peak | 5 |
| AugAugust | 87 | A | 25°C | 6 d | 11 h | Peak | 3 |
| SepSeptember | 76 | B | 22°C | 6 d | 9 h | Busy | 3 |
| OctOctober | 63 | C | 18°C | 8 d | 8 h | Shoulder | 2 |
| NovNovember | 55 | D | 13°C | 8 d | 7 h | Peak | 1 |
| DecDecember | 39 | F | 8°C | 7 d | 5 h | Peak | 2 |
What's on in Nantucket through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
- January
- Off-season shutdown5 Jan – 10 Apr (usually)Closure
- April
- Daffodil Festival20 Apr – 2 May (usually)Festival
- Tick season1 Apr – 31 Oct (usually)Hazard
- May
- Figawi race weekend20–30 May (usually)Festival
- Fog season1 May – 31 Jul (usually)Season
- June
- Nantucket Film Festival20 Jun – 1 Jul (usually)Festival
- July
- High summer1 Jul – 31 AugSeason
- Sea warm enough to swim15 Jul – 20 Sep (usually)Season
- September
- The quiet weeks8 Sep – 20 Oct (usually)Season
- November
- Christmas Stroll27 Nov – 8 Dec (usually)Festival
- December
- Nor'easter season1 Dec – 31 Mar (usually)Hazard
Crowds in Nantucket in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsHigh summer, Summer break in United States, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet