Vitamin D in Maryland in October: sun, UV and what to expect

Too cold Too cold here in October: afternoon highs average only 21.7°C, which is too chilly for sunbathing in light clothing. Try another month or a warmer destination.

5.7 hsun window (UV 2.5+)

4.6peak UV Index

12 minto a full dose

22°Cafternoon high

1/30rainy days

30/30sunny days

Open Maryland for October on the map Find stays in Maryland

How long in the sun in October?

If you travel anyway, plan your sun session around midday (roughly 11:00 to 15:00), when the UV Index peaks at about 4.6. With about a quarter of your skin bare, a full dose takes around 12 minutes for skin type III at age 30, and about 22 minutes at age 65.
Stop well before your skin turns pink. At this UV level skin type III can start to burn after about 43 minutes of midday sun, so cover up, find shade and use SPF 30+ on skin that stays out.
Water, sand and light surfaces reflect UV, so at the beach you get a little more sun than the number suggests, for the good and the bad.

Skin type	Full dose, age 30	Full dose, age 65	Time to burn
Type I	8 min	14 min	29 min
Type II	10 min	18 min	36 min
Type III	12 min	22 min	43 min
Type IV	17 min	33 min	65 min
Type V	23 min	43 min	87 min
Type VI	39 min	72 min	2.4 h

Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Annapolis, the median coastal place. Time to burn is the time to reach one minimal erythemal dose and does not depend on age. A rough planning guide, not medical advice.

Places in Maryland in October

Place	Rating	Sun window	Full dose	Afternoon high	Rainy days
St. Michaels	Too cold	5.7 h	11 min	21°C	1/30
Assateague Island	Too cold	5.6 h	11 min	21°C	1/30
Annapolis	Too cold	5.7 h	12 min	22°C	1/30
Ocean City	Too cold	5.6 h	12 min	19°C	1/30
Baltimore	Too cold	5.5 h	12 min	22°C	1/30

Other months in Maryland

Best months: May to September. Full Maryland guide

Other sunny places in October

All best places for vitamin D in October