SeasonMapHyannis (Cape Cod) weather by month
United States
The best time to visit Hyannis (Cape Cod) is June to August — 91/100 in July, 27°C and 7 rainy days. The best season is summer, June to August (87/100 on average).
The worst month is January at 35/100 — cold, rainy, clean air. See January →
Updated September 2026 · climate normals from ERA5 reanalysis
Planning the wider trip? Best time to visit United States →
Hyannis, month by month
Comfort score out of 100 for the kind of trip Hyannis 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 | 35 | F | 5°C | 10 d | 6 h | Busy | 1 |
| FebFebruary | 43 | F | 6°C | 9 d | 7 h | Quiet | 1 |
| MarMarch | 50 | D | 8°C | 9 d | 8 h | Busy | 1 |
| AprApril | 61 | C | 13°C | 11 d | 9 h | Shoulder | 1 |
| MayMay | 72 | B | 18°C | 10 d | 10 h | Peak | 2 |
| JunJune | 81 | A | 23°C | 7 d | 11 h | Peak | 2 |
| JulJuly | 91 | S | 27°C | 7 d | 11 h | Peak | 3 |
| AugAugust | 88 | A | 27°C | 7 d | 11 h | Peak | 4 |
| SepSeptember | 78 | B | 23°C | 8 d | 9 h | Peak | 3 |
| OctOctober | 62 | C | 18°C | 11 d | 7 h | Busy | 3 |
| NovNovember | 54 | D | 12°C | 9 d | 7 h | Busy | 1 |
| DecDecember | 38 | F | 7°C | 11 d | 5 h | Busy | 1 |
What's on in Hyannis through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
Crowds in Hyannis in July
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 crowdsIsland ferry high season, Peak summer season, Summer break in United States(estimated)
Peak crowdsBusyShoulder seasonQuiet