Annual average weather for Leinster Bay, St John Island, US Virgin Islands

Annual Temperature for Leinster Bay

The hottest month in Leinster Bay is July when the average maximum temperature is 32°, average temperature is 29° and average minimum temperature is 26°.

The coolest month in Leinster Bay is January when the average maximum temperature is 28°, average temperature is 26° and average minimum temperature is 23°.

Annual Sunshine for Leinster Bay

The longest days in Leinster Bay are in June, with an average of 13.2 hours of daylight per day. December has the shortest days with an average of 11 hours of daylight per day.

The sunniest days in Leinster Bay are in August which has the most hours of sunshine per day with an average of 10.3 hours of sunshine per day, making it a very sunny and pleasant month with long bright days. March has the least sunshine with an average of 4.9 hours of sunshine per day, making it a sunny month that is overcast at times.

The ultraviolet index is the highest in April when it reaches 13.5 and lowest in December when it reaches 7.5.

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.

Annual Sea Temperature for Leinster Bay

The warmest sea water temperatures in Leinster Bay are found in September when they peak at 28° and lowest in February when they dip to 26°.

The sea is excellent for swimming all year round as the water temperature is very warm and ideal for relaxing and swimming for the whole day.

Annual Rainfall for Leinster Bay

The wettest month in Leinster Bay is October with 19.7cm of rain and November has the most days of rain with 22.8 days with some rain, a very wet time to visit the beach.

The driest month in Leinster Bay is February with 4.5cm of rain and March has the fewest days of rain with 12.5 days with some rain, a slightly wet time to visit the beach.

Annual Humidity for Leinster Bay

The most humid month in Leinster Bay is September with a dew point (an indicator of humidity) of 25° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.

The least humid month in Leinster Bay is February with a dew point of 21° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.

Annual Wind Speed for Leinster Bay

The most windy month in Leinster Bay is July when the average maximum windspeed is 32kmh and the average wind speed is 18kmh.

The least windy month in Leinster Bay is September when the average maximum windspeed is 27kmh and the average wind speed is 14kmh.

Monthly Averages

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