Block Island, Rhode Island: vitamin D, best months and travel guide
Quiet island reached by ferry or small plane, with bluffs and beaches. Best for: couples, cyclists, walkers.
The best months for vitamin D in Block Island are June to August, when a full dose takes about 7 minutes at midday. Too cool from September to May.
Block Island month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Too cold | 0.6 h | 2.1 | – | 4°C | 11/30 |
| February | Too cold | 3.5 h | 3.3 | 16 min | 5°C | 7/30 |
| March | Too cold | 5.1 h | 4.4 | 12 min | 9°C | 9/30 |
| April | Too cold | 6.0 h | 5.4 | 10 min | 12°C | 6/30 |
| May | Too cold | 7.3 h | 6.1 | 9 min | 17°C | 9/30 |
| June | Excellent | 9.0 h | 7.5 | 7 min | 23°C | 6/30 |
| July | Excellent | 8.3 h | 7.0 | 8 min | 26°C | 4/30 |
| August | Excellent | 8.2 h | 6.7 | 8 min | 25°C | 5/30 |
| September | Too cold | 5.9 h | 4.9 | 11 min | 21°C | 6/30 |
| October | Too cold | 4.9 h | 4.2 | 13 min | 18°C | 1/30 |
| November | Too cold | 2.7 h | 2.9 | 18 min | 13°C | 4/30 |
| December | Too cold | 0.1 h | 2.1 | – | 6°C | 12/30 |
Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.
What to expect in Block Island
Quiet island reached by ferry or small plane, with bluffs and beaches. A short beach season from late June to early September, a cool sea, and easy driving between towns. Sailing and seafood are the highlights.
In Block Island afternoon highs average from 4°C in January to 26°C in July. The wettest month is December (about 12 rainy days out of 30) and the driest is October (1). Midday UV peaks at 7.5 in June.
Island off southern coast of RI. This island packs great scenery and great beaches into a small, walkable and bikable area. (Wikivoyage, CC BY-SA 4.0)
More about Rhode Island · Rhode Island in June · Best places in June
Questions about Block Island
When is the best time to visit Block Island for vitamin D?
The best months for vitamin D in Block Island are June to August, when a full dose takes about 7 minutes at midday.
What is the weather like in Block Island?
Afternoon highs average from 4°C in January to 26°C in July. The wettest month is December, with about 12 rainy days out of 30.
Which months should I avoid in Block Island?
For a beach stay, avoid the months when it is too cool from September to May.