Rehoboth Beach best: Excellent
Boardwalk resort town with restaurants and shops.
Its beach is known for being gay friendly.
Vitamin D in Delaware: best months for sun and a travel guide
The best months for vitamin D in Delaware are June to September. In June, a full dose of about 1,000 IU takes around 7 minutes at midday for skin type III at age 30, with 9.3 usable sun hours a day. For a beach stay it is too cool from October to May.
Delaware month by month
Delaware is rated at its median coastal place, for skin type III at age 30. Click a month for the details.
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Full dose, age 65 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|---|
| January | Too cold | 1.7 h | 2.4 | – | – | 8°C | 8/30 |
| February | Too cold | 3.7 h | 3.6 | 15 min | 28 min | 9°C | 6/30 |
| March | Too cold | 5.1 h | 4.5 | 12 min | 22 min | 13°C | 7/30 |
| April | Too cold | 6.5 h | 5.9 | 9 min | 17 min | 18°C | 4/30 |
| May | Too cold | 7.6 h | 6.9 | 8 min | 14 min | 21°C | 6/30 |
| June | Excellent | 9.3 h | 7.6 | 7 min | 13 min | 29°C | 4/30 |
| July | Excellent | 8.6 h | 7.3 | 7 min | 14 min | 31°C | 6/30 |
| August | Excellent | 8.1 h | 6.9 | 8 min | 14 min | 29°C | 6/30 |
| September | Good | 6.3 h | 5.5 | 10 min | 18 min | 24°C | 2/30 |
| October | Too cold | 5.6 h | 4.6 | 12 min | 22 min | 22°C | 1/30 |
| November | Too cold | 3.0 h | 3.2 | 17 min | 31 min | 15°C | 5/30 |
| December | Too cold | 1.6 h | 2.5 | 21 min | 40 min | 9°C | 4/30 |
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.
Travel guide: why go to Delaware
Why go
Delaware's beaches are quiet, clean and tax-free for shopping, with a more relaxed feel than neighbouring resorts.
Best for
Families and couples.
What to expect
A beach season from June to September, with a cool sea at the start. Weekends are busy, and outlet shops are a draw.
Places in Delaware
Each place has its own climate, so its best months can differ from the country as a whole.
Dewey Beach best: Excellent
Lively and young, with beach bars.
Popular beach with college students.
Bethany Beach best: Excellent
Quiet family town with a small boardwalk.
Popular with families. Bethany Beach is part of what is referred to as "The Quiet Resorts".
Lewes best: Excellent
Historic first-state town on the bay.
Known for its historic district
Fenwick Island best: Excellent
Quiet beach town on the Maryland line.
Some short descriptions come from Wikivoyage (CC BY-SA 4.0).
Questions about vitamin D in Delaware
When is the best time to visit Delaware for vitamin D?
The best months for vitamin D in Delaware are June to September. In June, a full dose of about 1,000 IU takes around 7 minutes at midday for skin type III at age 30, with 9.3 usable sun hours a day.
Can you get vitamin D from the sun in Delaware in December?
Yes, but slowly. In December a full dose takes about 21 minutes at midday for skin type III at age 30, with 1.6 usable hours a day.
How long do I need in the sun in Delaware?
In June, the best month, about 7 minutes at midday with a quarter of the body bare, for skin type III at age 30; about 13 minutes at age 65. Darker skin needs longer and fair skin burns sooner, so keep sessions short. This is an estimate for planning, not medical advice.
Which months should I avoid in Delaware?
For a beach stay, avoid the months when it is too cool from October to May.
What is the best place in Delaware for vitamin D?
In June the strongest sun of the places we rate is around Fenwick Island. Each place has its own rating, so open the place list to compare them.
Plan by month
- Jan Too cold
- Feb Too cold
- Mar Too cold
- Apr Too cold
- May Too cold
- Jun Excellent
- Jul Excellent
- Aug Excellent
- Sep Good
- Oct Too cold
- Nov Too cold
- Dec Too cold