The hottest month in Miami Dade County is August when the average maximum temperature is 32°, average temperature is 29° and average minimum temperature is 25°.
The coolest month in Miami Dade County is January when the average maximum temperature is 22°, average temperature is 18° and average minimum temperature is 13°.
The longest days in Miami Dade County are in June, with an average of 13.8 hours of daylight per day. December has the shortest days with an average of 10.4 hours of daylight per day.
The sunniest days in Miami Dade County are in April which has the most hours of sunshine per day with an average of 9.4 hours of sunshine per day, making it a sunny month with few clouds. December has the least sunshine with an average of 7.1 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 12.2 and lowest in December when it reaches 4.8.
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 Miami Dade County are found in July when they peak at 29° and lowest in March when they dip to 22°.
The sea is best for swimming between May and December when the temperature is above 26° which is warm and pleasant for relaxing and swimming for long periods.
The wettest month in Miami Dade County is August with 297.3cm of rain and the most days of rain with 19.9 days with some rain, a very wet time to visit the beach.
The driest month in Miami Dade County is January with 41.3cm of rain and April has the fewest days of rain with 7.9 days with some rain, a slightly wet time to visit the beach.
The most humid month in Miami Dade County is August 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 Miami Dade County is January with a dew point of 15° which is comfortable for everyone.
The most windy month in Miami Dade County is March when the average maximum windspeed is 29kmh and the average wind speed is 15kmh.
The least windy month in Miami Dade County is December when the average maximum windspeed is 26kmh and the average wind speed is 13kmh.