how hot does it need to be outside to tan?

It can be overcast and cold and you can still tan. UV rays.

it can be 20 degrees below zero. it just has to be sunny out. i have friends that work outside during the winter when the suns out and the next day theyre completely tan. 70 is hot enough to tan between 11-2 oclock is probably when the suns best for tanning

It does not matter if it is hot or cold out. The sun just needs to be out. The reason that people normally don't get tan in the winter is because that is when the sun is further away from the earth but it is possible.

If there isn't any clouds blocking the sun that should be enough sun to tan. My husband got tan when it was 65 outside just working in the yard.

The temperature has nothing to do with tanning. Tanning happens because of exposure to UV light. As long as it's light out, you can tan. You may be limited because it's too cold to expose much skin without getting cold, but the skin that is in the light will tan.

the temperature has nothing to do with it.

it's the suns rays, not the heat that comes off of them.

you can get some rays even when it's cloudy, only those are the rays that make you eventually wrinkle.

if it's 70 outside it's either sunny, or cloudy and really humid. there's no point in laying out if it's cloudy though cause you won't be getting the types of rays that make you tan. so let's just say if there's clear sunshine, go tan!

Either way, tanning is not good for your skin, eyes, lips, etc.

Tanning beds are not safe either,

So your best bet would be the spray on tan.

UVA and UVB rays can cause serious damage to you and your skin, and your chances of getting skin cancer, or worse, melonoma, increases.

But if you want an answer, it doesn't matter how hot it is, it just has to be relitively sunny...

Temperature has nothing to do with your tan, it has everything to do with the radiation that permeates your skin. The UV index will give you a better idea.

I used to roof houses in the summer for college and one day it was really cold and the wind had picked up but the sun was out. Since it was cool I didn't notice until I got inside that I had a wicked sun burn on my back.

Temperature has nothing to do with it at all. It's the sun that matters. You can get a tan at the top of a mountain if you want...as long as the sun's out.

You can tan in the middle of winter if you want to freeze your butt off. It has nothing to do with the temp. It is about the sun. If the sun is shining you can get the rays on your skin. You can also get a sunburn if it is cloudy out too.

You can get a really dark tan with SPF 50 that deals with both UVA and UVB rays at 60. It is the sun's rays not temp that matters.