New Haven weather by month & the best time to visit
United States · coastal city break · humid subtropical climate
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The best time to visit New Haven is May — its sunniest month (Sunshine Score 74/100), with July and August close behind. New Haven averages about 2,191 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 95 mm of rain in May.
When is the best time to visit New Haven?
For sunshine, the best time to visit New Haven is May, then July and August. The dullest month is January (0/100, 76 mm of rain). The full month-by-month picture is in the table below.
How sunny is New Haven?
New Haven gets a moderate 2,191 hours of sunshine a year. 74 Sunshine Score points separate May (74) from January (0), so the month you pick matters. It ranks #325 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,209 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 | 2° / 36°F | -7° / 19°F | 76 mm | 1 | 5° / 41°F |
| February | 0 | 3° / 37°F | -6° / 21°F | 81 mm | 2 | 4° / 39°F |
| March | 0 | 8° / 46°F | -2° / 28°F | 97 mm | 3 | 6° / 43°F |
| April | 42 | 15° / 59°F | 3° / 37°F | 105 mm | 5 | 9° / 48°F |
| May | 74 | 21° / 70°F | 10° / 50°F | 95 mm | 6 | 15° / 59°F |
| June | 70 | 26° / 79°F | 15° / 59°F | 118 mm | 7 | 20° / 68°F |
| July | 73 | 30° / 86°F | 19° / 66°F | 101 mm | 7 | 24° / 75°F |
| August | 72 | 29° / 84°F | 18° / 64°F | 109 mm | 6 | 24° / 75°F |
| September | 72 | 25° / 77°F | 14° / 57°F | 106 mm | 5 | 22° / 72°F |
| October | 58 | 18° / 64°F | 8° / 46°F | 121 mm | 3 | 18° / 64°F |
| November | 19 | 11° / 52°F | 2° / 36°F | 89 mm | 2 | 13° / 55°F |
| December | 0 | 5° / 41°F | -3° / 27°F | 111 mm | 1 | 7° / 45°F |
Sea temperature in New Haven by month
The sea off New Haven is warmest in July at around 24°C / 75°F, and coolest in February at 4°C / 39°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
Head-to-head
How New Haven compares month by month: New Haven vs Hartford · New Haven vs Albany · New Haven vs White Plains · New Haven vs Islip · all comparisons
New Haven: questions and answers
What kind of destination is New Haven?
New Haven is a coastal city break in United States with a humid subtropical climate — the sea reaches 24°C at its warmest and is swimmable (21°C+) about 3 months a year.
How many hours of sunshine does New Haven get a year?
New Haven gets about 2,191 hours of sunshine a year, at its best around May.
When is the best time to visit New Haven?
The sunniest time to visit New Haven is May, when the Sunshine Score peaks at 74/100 (with July and August close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in New Haven?
January is the least sunny month in New Haven, scoring 0/100 with about 76 mm of rain.
What is the sea temperature in New Haven?
The sea in New Haven ranges from about 4°C (February) to 24°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in New Haven?
The typical midday UV index in New Haven 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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