The hottest month in The Blue Lagoon is July when the average maximum temperature is 31°, average temperature is 27° and average minimum temperature is 22°.
The coolest month in The Blue Lagoon is February when the average maximum temperature is 15°, average temperature is 12° and average minimum temperature is 9°.
The longest days in The Blue Lagoon are in June, with an average of 14.6 hours of daylight per day. December has the shortest days with an average of 9.7 hours of daylight per day.
The sunniest days in The Blue Lagoon are in July which has the most hours of sunshine per day with an average of 12.6 hours of sunshine per day, making it a extremely sunny and pleasant month with exceptionally long bright days. December has the least sunshine with an average of 6.1 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in July when it reaches 10.7 and lowest in December when it reaches 2.3.
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 warmest sea water temperatures in The Blue Lagoon are found in August when they peak at 27° and lowest in February when they dip to 16°.
The sea is best for swimming between June and December when the temperature is above 20° which is comfortable for swimming though some may prefer warmer water.
The wettest month in The Blue Lagoon is November with 19.7cm of rain and December has the most days of rain with 17.2 days with some rain, a wet time to visit the beach.
The driest month in The Blue Lagoon is July with 0cm of rain and the least days of rain with 1 days with some rain, an extremely dry time to visit the beach.
The most humid month in The Blue Lagoon is August with a dew point (an indicator of humidity) of 22° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.
The least humid month in The Blue Lagoon is February with a dew point of 10° which is a bit dry for some.
The most windy month in The Blue Lagoon is February when the average maximum windspeed is 28kmh and the average wind speed is 16kmh.
The least windy month in The Blue Lagoon is August when the average maximum windspeed is 20kmh and the average wind speed is 10kmh.