The hottest month in Indonesia is October when the average maximum temperature is 29°, average temperature is 26° and average minimum temperature is 23°.
The coolest month in Indonesia is September when the average maximum temperature is 28°, average temperature is 25° and average minimum temperature is 22°.
The longest days in Indonesia are in January, with an average of 12.6 hours of daylight per day. June has the shortest days with an average of 11.6 hours of daylight per day.
The sunniest days in Indonesia are in October which has the most hours of sunshine per day with an average of 9.9 hours of sunshine per day, making it a sunny month with few clouds. January has the least sunshine with an average of 7.5 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in February when it reaches 15.9 and lowest in June when it reaches 10.
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 Indonesia are found in November when they peak at 29° and lowest in August when they dip to 27°.
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.
The wettest month in Indonesia is January with 18.7cm of rain and the most days of rain with 18.8 days with some rain, a wet time to visit the beach.
The driest month in Indonesia is August with 0.8cm of rain and the least days of rain with 2.6 days with some rain, a very dry time to visit the beach.
The most humid month in Indonesia is April with a dew point (an indicator of humidity) of 24° 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 Indonesia is August 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.
The most windy month in Indonesia is January when the average maximum windspeed is 25kmh and the average wind speed is 12kmh.
The least windy month in Indonesia is April when the average maximum windspeed is 19kmh and the average wind speed is 7kmh.