Hyannis weather by month & the best time to visit
🇺🇸 United States · seaside town · oceanic / maritime climate
The best time to visit Hyannis is July — its sunniest month (Sunshine Score 78/100), with August and September close behind. Hyannis averages about 2,197 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 72 mm of rain in July.
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- Sun hours / year
- 2,197
- Sunniest month
- July
- Peak score
- 78/100
- Rain / year
- 1,126 mm
- Snow / year
- ≈54 cm
- Midday UV at peak
- 7 (high)
- Sea at warmest
- 26°C / 79°F
- Population
- 14k
- Elevation
- 18 m
When is the best time to visit Hyannis?
For sunshine, the best time to visit Hyannis is July, then August and September. The dullest month is January (0/100, 91 mm of rain). The full month-by-month picture is in the table below.
How sunny is Hyannis?
Hyannis gets a moderate 2,197 hours of sunshine a year. 78 Sunshine Score points separate July (78) from January (0), so the month you pick matters. It ranks #320 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,126 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 4° / 39°F | 0° / 32°F | 91 mm | 1 | 4° / 39°F |
| February | 0 | 4° / 39°F | 0° / 32°F | 87 mm | 2 | 3° / 37°F |
| March | 0 | 5° / 41°F | 2° / 36°F | 106 mm | 3 | 5° / 41°F |
| April | 0 | 8° / 46°F | 5° / 41°F | 97 mm | 5 | 9° / 48°F |
| May | 25 | 12° / 54°F | 10° / 50°F | 86 mm | 6 | 15° / 59°F |
| June | 57 | 17° / 63°F | 15° / 59°F | 84 mm | 7 | 20° / 68°F |
| July | 78 | 21° / 70°F | 19° / 66°F | 72 mm | 7 | 25° / 77°F |
| August | 78 | 22° / 72°F | 20° / 68°F | 74 mm | 6 | 26° / 79°F |
| September | 68 | 19° / 66°F | 17° / 63°F | 95 mm | 5 | 22° / 72°F |
| October | 41 | 15° / 59°F | 13° / 55°F | 114 mm | 3 | 17° / 63°F |
| November | 18 | 11° / 52°F | 8° / 46°F | 106 mm | 2 | 11° / 52°F |
| December | 0 | 7° / 45°F | 3° / 37°F | 114 mm | 1 | 6° / 43°F |
Sea temperature in Hyannis by month
The sea off Hyannis is warmest in August at around 26°C / 79°F, and coolest in February at 3°C / 37°F. The water sits at a comfortable 21°C or warmer roughly 3 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Hyannis on the interactive sunshine globe →
Nearby places for sunshine
- Martha's Vineyard United States · 41 km · best in Jul · 2,196 h sun/yr
- Nantucket United States · 50 km · best in Jul · 2,196 h sun/yr
- Providence/Warwick United States · 95 km · best in Aug · 2,279 h sun/yr
- Boston United States · 98 km · best in Jul · 2,157 h sun/yr
- Manchester (New Hampshire) United States · 170 km · best in Sep · 2,158 h sun/yr
- Hartford United States · 202 km · best in May · 2,192 h sun/yr
Nearest destinations
- New Bedford United States · 56 km · 2,197 h sun/yr · best in Jul
- Newport United States · 85 km · 2,279 h sun/yr · best in Aug
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