Block Island weather by month & the best time to visit
🇺🇸 United States · seaside town · humid subtropical climate
The best time to visit Block Island is July — its sunniest month (Sunshine Score 75/100), with August and September close behind. Block Island averages about 2,278 hours of sunshine a year. Daytime highs around 23°C / 73°F and roughly 91 mm of rain in July.
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- Sun hours / year
- 2,278
- Sunniest month
- July
- Peak score
- 75/100
- Rain / year
- 1,255 mm
- Snow / year
- ≈55 cm
- Midday UV at peak
- 7 (high)
- Sea at warmest
- 22°C / 72°F
- Population
- 1k
- Elevation
- 39 m
When is the best time to visit Block Island?
For sunshine, the best time to visit Block Island is July, then August and September. The dullest month is January (0/100, 98 mm of rain). The full month-by-month picture is in the table below.
How sunny is Block Island?
Block Island gets a moderate 2,278 hours of sunshine a year. 75 Sunshine Score points separate July (75) from January (0), so the month you pick matters. It ranks #291 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,255 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 | 98 mm | 1 | 7° / 45°F |
| February | 0 | 4° / 39°F | -1° / 30°F | 95 mm | 2 | 5° / 41°F |
| March | 0 | 6° / 43°F | 2° / 36°F | 117 mm | 3 | 6° / 43°F |
| April | 6 | 9° / 48°F | 6° / 43°F | 110 mm | 5 | 8° / 46°F |
| May | 38 | 14° / 57°F | 10° / 50°F | 90 mm | 6 | 13° / 55°F |
| June | 67 | 19° / 66°F | 16° / 61°F | 101 mm | 7 | 18° / 64°F |
| July | 75 | 23° / 73°F | 20° / 68°F | 91 mm | 7 | 21° / 70°F |
| August | 75 | 24° / 75°F | 21° / 70°F | 91 mm | 6 | 22° / 72°F |
| September | 74 | 21° / 70°F | 18° / 64°F | 99 mm | 5 | 20° / 68°F |
| October | 52 | 17° / 63°F | 13° / 55°F | 127 mm | 3 | 17° / 63°F |
| November | 24 | 12° / 54°F | 8° / 46°F | 104 mm | 2 | 15° / 59°F |
| December | 0 | 7° / 45°F | 3° / 37°F | 132 mm | 1 | 9° / 48°F |
Sea temperature in Block Island by month
The sea off Block Island is warmest in August at around 22°C / 72°F, and coolest in February at 5°C / 41°F. The water sits at a comfortable 21°C or warmer roughly 2 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Block Island on the interactive sunshine globe →
Nearby places for sunshine
- Providence/Warwick United States · 63 km · best in Aug · 2,279 h sun/yr
- Martha's Vineyard United States · 84 km · best in Jul · 2,196 h sun/yr
- New Haven United States · 110 km · best in May · 2,191 h sun/yr
- Hartford United States · 126 km · best in May · 2,192 h sun/yr
- Nantucket United States · 127 km · best in Jul · 2,196 h sun/yr
- Islip United States · 134 km · best in Jul · 2,252 h sun/yr
Nearest destinations
- Westerly United States · 28 km · 2,279 h sun/yr · best in Jul
- Montauk United States · 30 km · 2,278 h sun/yr · best in Jul
- Newport United States · 47 km · 2,279 h sun/yr · best in Aug
- New Bedford United States · 77 km · 2,197 h sun/yr · best in Jul
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