The average day light hours per day in Lord Howe Island in May are 10.5 and there are 2.5 hours of sunshine per day on average during May making it not a particularly sunny month.
The ultraviolet index in Lord Howe Island in May is typically 4.1 during May. An ultraviolet index reading of 3 to 5 indicates there is a moderate risk of harm from unprotected sun exposure. Keep out of the sun during the strongest hours around midday when unprotected skin risks burning in less than 30 minutes. For the sensitive wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days, and after swimming or sweating. Tanning for hours is possible with the right application of sun cream. Watch out for relections from water that may increase ultraviolet exposure.
The average sea water temperature in Lord Howe Island in May is 21° which is comfortable for swimming though some may prefer warmer water.