Vitamin DGlobal Solar Explorer

Vitamin D from the sun in Johannesburg

In Johannesburg you can synthesize vitamin D all year round.

Year-round profile in Johannesburg

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Daily hours with enough sun to synthesize vitamin D across the year.

Seasonal windows

  • March: between 09:00 and 17:00, about 4 min for 1000 IU.
  • June: between 10:00 and 15:00, about 9 min for 1000 IU.
  • September: between 09:00 and 16:00, about 5 min for 1000 IU.
  • December: between 08:00 and 17:00, about 4 min for 1000 IU.

Estimated for Fitzpatrick type III skin, arms and face exposed, clear sky.

Calculate my window in Johannesburg

Frequently asked questions about vitamin D in Johannesburg

Can I get vitamin D from the sun in winter in Johannesburg?
In Johannesburg you can synthesize vitamin D all year round.
How many minutes of sun do I need in Johannesburg?
In summer, about 4 minutes with arms and face exposed is enough for 1000 IU (Fitzpatrick type III skin, clear sky).
Built by Javier Aguilar