The hottest month in Lanai Island is August when the average maximum temperature is 28°, average temperature is 23° and average minimum temperature is 19°.
The coolest month in Lanai Island is February when the average maximum temperature is 24°, average temperature is 20° and average minimum temperature is 16°.
The longest days in Lanai Island are in June, with an average of 13.4 hours of daylight per day. December has the shortest days with an average of 10.9 hours of daylight per day.
The sunniest days in Lanai Island are in June which has the most hours of sunshine per day with an average of 7.3 hours of sunshine per day, making it a quite sunny month with some cloud cover. December has the least sunshine with an average of 5 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in July when it reaches 13.1 and lowest in December when it reaches 6.6.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. 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 warmest sea water temperatures in Lanai Island are found in August when they peak at 27° and lowest in March when they dip to 25°.
The sea is best for swimming between June and December when the temperature is above 26° which is very warm and ideal for relaxing and swimming for the whole day.
The wettest month in Lanai Island is December with 4.3cm of rain and July has the most days of rain with 14.6 days with some rain, a slightly wet time to visit the beach.
The driest month in Lanai Island is June with 0.4cm of rain and December has the fewest days of rain with 9.6 days with some rain, a dry time to visit the beach.
The most humid month in Lanai Island is August with a dew point (an indicator of humidity) of 20° which is somewhat uncomfortable for most people in cities but fine on a beach.
The least humid month in Lanai Island is February with a dew point of 18° which is OK for most but slightly uncomfortable for some.
The most windy month in Lanai Island is August when the average maximum windspeed is 33kmh and the average wind speed is 15kmh.
The least windy month in Lanai Island is October when the average maximum windspeed is 27kmh and the average wind speed is 11kmh.