Which months give vitamin D from the sun in Reykjavik?

May to August. For the rest of the year the UV index in Reykjavik stays below 3 on most days, even at noon.

Vitamin D today

Is there vitamin D in Reykjavik today?

In Reykjavik the UV index does not reach 3 at any point today, and below that minimum the skin makes no vitamin D however long the exposure lasts. What decides it is not how high the sun gets but how much UVB reaches the ground: with the sun this oblique, the ozone layer absorbs nearly all of it.

Vitamin D windowNone today

In the sun, at the best moment—

Sunrise05:50

Sunset21:10

Clear-sky figures: cloud lowers the UV index and lengthens the time needed.

Why tomorrow is not the same

The window moves with the height of the sun, which changes every day, and with the ozone column over Reykjavik, which varies with the season. It is not one fixed fact about the city: it runs much longer in some months than in others, and at high enough latitudes there are months when it never opens.

See the Reykjavik vitamin D guide

Sun and vitamin D in Reykjavik: common questions

What time should you get sun in Reykjavik today?: No hour works. Today the UV index does not reach 3 in Reykjavik at any point of the day, and below that minimum the skin makes no vitamin D however long the exposure lasts.
What time are sunrise and sunset in Reykjavik today?: Today the sun rises at 05:50 and sets at 21:10 in Reykjavik, with 15 h 20 min of daylight. Most of that light does nothing for vitamin D: only the stretch where the UV index reaches 3 counts.
Which months give vitamin D from the sun in Reykjavik?: May to August. For the rest of the year the UV index in Reykjavik stays below 3 on most days, even at noon.