The average day light hours per day in Lord Howe Island in September are 11.9 and there are 4.4 hours of sunshine per day on average during September making it a sunny month that is overcast at times.
The ultraviolet index in Lord Howe Island in September is typically 7.3 during September. An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and 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. Watch out for relections from water that may increase ultraviolet exposure.
The average sea water temperature in Lord Howe Island in September is 20° which is comfortable for swimming though some may prefer warmer water.