Which months give vitamin D from the sun in Paris?

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

Vitamin D today

Is there vitamin D in Paris today?

In Paris 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 window: None today
In the sun, at the best moment: —
Sunrise: 08:04
Sunset: 19:10

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 Paris, 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 Paris vitamin D guide

Sun and vitamin D in Paris: common questions

What time should you get sun in Paris today?: No hour works. Today the UV index does not reach 3 in Paris 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 Paris today?: Today the sun rises at 08:04 and sets at 19:10 in Paris, with 11 h 06 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 Paris?: April to September. For the rest of the year the UV index in Paris stays below 3 on most days, even at noon.

Paris: we'll tell you the days you can make vitamin D.

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