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.
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.
Nearest destinations
Hyannis: questions and answers
What kind of destination is Hyannis?
Hyannis is a seaside town in United States with a oceanic / maritime climate — the sea reaches 26°C at its warmest and is swimmable (21°C+) about 3 months a year.
How many hours of sunshine does Hyannis get a year?
Hyannis gets about 2,197 hours of sunshine a year, at its best around July.
When is the best time to visit Hyannis?
The sunniest time to visit Hyannis is July, when the Sunshine Score peaks at 78/100 (with August and September close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Hyannis?
January is the least sunny month in Hyannis, scoring 0/100 with about 91 mm of rain.
What is the sea temperature in Hyannis?
The sea in Hyannis ranges from about 3°C (February) to 26°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Hyannis?
The typical midday UV index in Hyannis peaks around 7 (high) in June, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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