The hottest month in Bay of Islands is February when the average maximum temperature is 22°, average temperature is 18° and average minimum temperature is 15°.
The coolest month in Bay of Islands is July when the average maximum temperature is 13°, average temperature is 10° and average minimum temperature is 7°.
The longest days in Bay of Islands are in December, with an average of 14.6 hours of daylight per day. June has the shortest days with an average of 9.7 hours of daylight per day.
The sunniest days in Bay of Islands are in December which has the most hours of sunshine per day with an average of 7.2 hours of sunshine per day, making it a quite sunny month with some cloud cover. May has the least sunshine with an average of 4 hours of sunshine per day, making it not a particularly sunny month.
The ultraviolet index is the highest in January when it reaches 13.2 and lowest in June when it reaches 2.2.
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 Bay of Islands are found in February when they peak at 20° and lowest in August when they dip to 14°.
The sea is best for swimming between December and May when the temperature is above 17° which is cool for swimming, shorty wetsuit may help you extend your time in the water.
The wettest month in Bay of Islands is April with 3.4cm of rain and August has the most days of rain with 16.1 days with some rain, a wet time to visit the beach.
The driest month in Bay of Islands is January with 0.5cm of rain and the least days of rain with 7.9 days with some rain, a dry time to visit the beach.
The most humid month in Bay of Islands is February with a dew point (an indicator of humidity) of 16° which is comfortable for everyone.
The least humid month in Bay of Islands is July with a dew point of 9° which is a bit dry for some.
The most windy month in Bay of Islands is October when the average maximum windspeed is 29kmh and the average wind speed is 17kmh.
The least windy month in Bay of Islands is May when the average maximum windspeed is 22kmh and the average wind speed is 12kmh.