Which months give vitamin D from the sun in Tokyo?

February to November. For the rest of the year the UV index in Tokyo stays below 3 on most days, even at noon.

Vitamin D today

Is there vitamin D in Tokyo today?

In Tokyo the skin makes vitamin D while the UV index reaches 3: today that runs from 09:00 to 16:00. At the best moment about 6 minutes with an average skin type and a quarter of the body uncovered is enough for roughly 1000 IU.

Vitamin D window09:00–16:00

In the sun, at the best moment6 minutes

Sunrise05:08

Sunset18:19

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 Tokyo, 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 Tokyo vitamin D guide

Sun and vitamin D in Tokyo: common questions

What time should you get sun in Tokyo today?: Between 09:00 and 16:00: that is the stretch where the UV index reaches 3 in Tokyo, the minimum at which skin makes vitamin D. At the best moment about 6 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 Tokyo today?: Today the sun rises at 05:08 and sets at 18:19 in Tokyo, with 13 h 11 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 Tokyo?: February to November. For the rest of the year the UV index in Tokyo stays below 3 on most days, even at noon.