If you have a choice, stay indoors between 10 am and 2 pm. It is during this four-hour window period that the sun's rays are at their most intense. Outdoor activities during this period could lead to a bad sunburn in just 30 minutes.
If you are going to be outdoors for long periods, spare a thought for broadspectrum sunscreen lotions that protect you from both UVA and UVB rays. Lotions with titanium dioxide or zinc oxide are a good choice.
Clouds don't help
Cloudy skies doesn't mean you are safe from sunburn - not by a long shot! While clouds do block some of the sun's rays, the most dangerous ones manage to get through. So, keep that sunscreen handy!
Wear clothing that shields you from sunrays. While longsleeve shirts may not seem very comfortable in the sweaty outdoors, your skin will thank you for the extra protection. Clothes help a lot in preventing sunburn.
The right glass
If you thought tinted car windows will help prevent sunburn, think again. Glass - tinted or not - is not effective in blocking UVA rays, at least unless it is specially treated for the purpose. The same goes for sunglasses.
Wear a wide-brimmed hat on extremely sunny days, even if it makes you look like a John Wayne wannabe. Trendier baseball caps may help protect your face, but they leave the back of your neck and the ears exposed.