Sun safety at different times of year and day
Your sun safety needs change at different times of year and different times of day. That’s because UV radiation varies during the year and across Australia depending on the season.
UV radiation levels are highest between about 9 am and 4 pm, depending on where you are in Australia and the time of year. You need sun protection when the UV radiation level is 3 or above.
You can check the UV levels for your area using the SunSmart app on this page or the Bureau of Meteorology UV and sun protection guide.
Source: http://raisingchildren.net.au/articles/articles/safety_in_the_sun.html