Dermatologist Shereene Idriss explains when sunscreen actually matters. Skip it on low UV days, but wear it when the index hits 3 or higher. Same time of day means different UV exposure depending where you are: 9am in New York and 9am in Sydney in November are not the same.
Anytime the UV index is above 3.
I'm a board certified dermatologist and you do not need to wear sunscreen every single day. Now I know you may be thinking, what the hell is she talking about? She's been pushing us to wear sunscreen every day. Yes, I'm a simple human and I think people understand simplicity. Wearing sunscreen every day will create a habit that is harder to break in the long run. So in the off chance that it's a super sunny day outside and the UV index is high, something is better than nothing. But hear what I just said. There is something known as a UV index which measures how powerful the rays of the UV is. And that is an important aspect to take into consideration when you're asking yourself questions like if I'm going out for a run in the morning, do I need to use sunscreen or do I need to reapply sunscreen? Because 9am in New York City in November where the UV index is one is very different than 9am in Sydney in November. And as a rule of thumb, anytime the UV index is above 3, you have to have sunscreen on.
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