Which months give vitamin D from the sun in London?

April to September. For the rest of the year the UV index in London stays below 3 on most days, even at noon.

Vitamin D today

Is there vitamin D in London today?

In London the skin makes vitamin D while the UV index reaches 3: today that runs from 11:00 to 16:00. At the best moment about 11 minutes with an average skin type and a quarter of the body uncovered is enough for roughly 1000 IU.

Vitamin D window11:00–16:00

In the sun, at the best moment11 minutes

Sunrise06:02

Sunset20:03

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 London, 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 London vitamin D guide

Sun and vitamin D in London: common questions

What time should you get sun in London today?: Between 11:00 and 16:00: that is the stretch where the UV index reaches 3 in London, the minimum at which skin makes vitamin D. At the best moment about 11 minutes with an average skin type and a quarter of the body uncovered is enough for roughly 1000 IU.
What time are sunrise and sunset in London today?: Today the sun rises at 06:02 and sets at 20:03 in London, with 14 h 01 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 London?: April to September. For the rest of the year the UV index in London stays below 3 on most days, even at noon.