Weather in Key Biscayne, United States in September

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Visiting Key Biscayne, United States in September

The weather in September is marginally cooler than the previous month and temperatures continue to drop slightly into October. September has average maximum temperatures of 32°C (89°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 61% making it sunny but overcast at times. The hours of sunshine per day are 7.5hrs making the days quite long and bright. It is not an optimal time for sunbathing but it is possible on clearer days in Key Biscayne.

September has total rainfall of 31.5cm (12.4inches) making it rainy with a chance of occasional heavy tropical showers. There are 23 days with some rainfall so there are few clear days to enjoy the beach.

Sea temperatures are a very warm 29°C (84°F). September is an excellent month for swimming in Key Biscayne with very comfortable temperatures for bathing all day.

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.

Can you sunbathe in Key Biscayne in September?

Yes, September is not an optimal time for sunbathing but it is possible on clearer days in Key Biscayne.

September has average maximum temperatures of 32°C (89°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 61% making it sunny but overcast at times. The hours of sunshine per day are 7.5hrs making the days quite long and bright. September has total rainfall of 31.5cm (12.4inches) making it rainy with a chance of occasional heavy tropical showers. There are 23 days with some rainfall so there are few clear days to enjoy the beach.

More about September temperature and sunshine.

Can you swim in Key Biscayne in September?

Yes, September is an excellent month for swimming in Key Biscayne with very warm sea temperatures 29°C (84°F).

More about September sea temperatures.

Is September a good time to holiday in Key Biscayne?

Yes, September is a good time for a holiday in Key Biscayne.

September has average maximum temperatures of 32°C (89°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 61% making it sunny but overcast at times. The hours of sunshine per day are 7.5hrs making the days quite long and bright. September has total rainfall of 31.5cm (12.4inches) making it rainy with a chance of occasional heavy tropical showers. There are 23 days with some rainfall so there are few clear days to enjoy the beach. It is not an optimal time for sunbathing but it is possible on clearer days in Key Biscayne. Sea temperatures are a very warm 29°C (84°F). September is an excellent month for swimming in Key Biscayne with very comfortable temperatures for bathing all day.

More about the September temperatures and sunshine.

Is Key Biscayne warm in September?

Yes, Key Biscayne is very hot and perfect for sunbathing on clear days in September.

The average maximum temperature in Key Biscayne in September is 32°C (89°F). The average maximum temperature is 33°C (91°) in the previous month and 30°C (86°F) in the next month.

The average temperature in Key Biscayne in September is 28°C (83°F). The average temperature is 29°C (85°F) in the previous month and 27°C (80°F) in the next month.

More info about the September temperatures and sunshine.

How sunny is Key Biscayne in September?

The average day light hours per day in Key Biscayne in September are 12.3. The sunshine percentage is 61% making it sunny but overcast at times. The hours of sunshine per day are 7.5hrs making the days quite long and bright.

More about September sunshine.

Temperature in Key Biscayne in September

The weather in September is marginally cooler than the previous month and temperatures continue to drop slightly into October. The average maximum temperature in Key Biscayne in September is 32°C (89°F). The average maximum temperature is 33°C (91°F) in the previous month and 30°C (86°F) in the next month.

The average temperature in Key Biscayne in September is 28°C (83°F). The average temperature is 29°C (85°F) in the previous month and 27°C (80°F) in the next month.

The average minimum temperature in Key Biscayne in September is 25°C (77°F). The minimum temperature is 26°C (78°F) in the previous month and 23°C (74°F) in the next month.

Sunshine in Key Biscayne in September

The days in September are slightly shorter than the previous month and days continue to get slightly shorter into October. September has fewer hours of sunshine than the previous month and hours of sunshine continue to drop slightly into October. During September the average day light hours are 12.3 per day in Key Biscayne. The sunshine percentage is 61% making it sunny but overcast at times. The hours of sunshine per day are 7.5hrs making the days quite long and bright.

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.

Sea Temperature in Key Biscayne in September

The average sea water temperature in Key Biscayne in September is 29°C (84.2°F) which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Key Biscayne in September

September weather is slightly wetter than the previous month. September has a few more days of rain than the previous month. The average total rainfall in Key Biscayne in September is 31.5cm (12.4inches) and on average there are 23 rainy days in September making it a very wet time to visit the beach.

Humidity in Key Biscayne in September

The maximum dew point (an indicator of humidity) in Key Biscayne in September is 24°C (76°F) 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°C (77°F) in the previous month and 22°C (22°F) 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.

Wind Speed in Key Biscayne in September

The average maximum wind speed in Key Biscayne in September is typically 28KM/H (18MPH). The average maximum wind speed is 29KM/H (18MPH) in the previous month and 27KM/H (17MPH) in the next month.

The average wind speed in Key Biscayne in September is typically 11KM/H (7MPH). The average wind speed is 10KM/H (6MPH) in the previous month and 12KM/H (8MPH) in the next month.

The average wind direction in Key Biscayne in September is from the East.

Monthly Averages

Suggested Beaches in September

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Need Inspiration?

Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.