The hottest month in Watamu Beach is March when the average maximum temperature is 31°, average temperature is 28° and average minimum temperature is 25°.
The coolest month in Watamu Beach is August when the average maximum temperature is 27°, average temperature is 25° and average minimum temperature is 23°.
The longest days in Watamu Beach are in January, with an average of 12.3 hours of daylight per day. June has the shortest days with an average of 11.9 hours of daylight per day.
The sunniest days in Watamu Beach are in September which has the most hours of sunshine per day with an average of 9.7 hours of sunshine per day, making it a sunny month with few clouds. January 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 February when it reaches 15.2 and lowest in June when it reaches 10.7.
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 Watamu Beach are found in April when they peak at 29° and lowest in August when they dip to 25°.
The sea is best for swimming between November and May when the temperature is above 27° which is very warm and ideal for relaxing and swimming for the whole day.
The most humid month in Watamu Beach is March 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 Watamu Beach is August with a dew point 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 most windy month in Watamu Beach is July when the average maximum windspeed is 30kmh and the average wind speed is 19kmh.
The least windy month in Watamu Beach is November when the average maximum windspeed is 23kmh and the average wind speed is 9kmh.