September is a hot and very rainy time for sunbathing in Key Biscayne. September is an excellent month for swimming in Key Biscayne with very warm sea temperatures. Consider visiting Key Biscayne in the months of January, March, November, December, for the best beach weather. Also consider one of our other suggestions for September.
The average maximum temperature in Key Biscayne in September is 32°. The average maximum temperature is 33° in the previous month and 30° in the next month.
The average temperature in Key Biscayne in September is 28°. The average temperature ranges is 29° in the previous month and 27° in the next month.
The average minimum temperature in Key Biscayne in September is 25°. The minimum temperature is 26° in the previous month and 23° in the next month.
The average day light hours per day in Key Biscayne in September are 12.3 and there are 7.5 hours of sunshine per day on average during September making it a quite sunny month with some cloud cover.
The ultraviolet index in Key Biscayne in September is typically 10.8 during September. An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. 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 average sea water temperature in Key Biscayne in September is 29° which is very warm and ideal for relaxing and swimming for the whole day.
The average total rainfall in Key Biscayne in September is 314.8cm and on average there are 23 rainy days in September making it a very wet time to visit the beach.
The maximum dew point (an indicator of humidity) in Key Biscayne in September is 24° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning. The dew point is 25° in the previous month and 22° in the next month.
The average maximum relative humidity in Key Biscayne in September is typically 89.3%. The maximum relative humidity is 88% in the previous month and 85.3% in the next month.
The average relative humidity in Key Biscayne in September is typically 74.6%. The average relative humidity is 73.2% in the previous month and 71.1% in the next month.
The average maximum wind speed in Key Biscayne in September is typically 28kmh. The average maximum wind speed is 29kmh in the previous month and 27kmh in the next month.
The average wind speed in Key Biscayne in September is typically 11kmh. The average wind speed is 10kmh in the previous month and 12kmh in the next month.
The average wind direction in Key Biscayne in September is from the East.
