Can you tan in the sun if its sunny but its only 17degrees?

Yes, you can tan in the sun even if the temperature is only 17 degrees Celsius. UV rays from the sun can still penetrate the atmosphere and affect your skin, leading to tanning or sunburn regardless of the air temperature. However, the intensity of UV radiation can vary, so it's important to use sunscreen to protect your skin, especially if you're spending extended time outdoors.