September weather forecastSouth Beach, FL
September
Weather in September
September, the first month of the autumn in South Beach, is also a moderately hot month, with an average temperature ranging between min 77.4°F (25.2°C) and max 85.5°F (29.7°C).Temperature
The introduction of September notes a subtle temperature variation to a moderately hot 85.5°F (29.7°C) from August's 87.4°F (30.8°C). In South Beach, the nightly September temperatures experience a slight descent from daily highs to an average low of 77.4°F (25.2°C).Heat index
For most parts of September, the heat index is estimated at a fiery hot 96.8°F (36°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.Remember that heat index calculations are made for conditions in the shade with light wind. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.
Humidity
In September, the average relative humidity is 78%.Rainfall
In September, the rain falls for 19.6 days. Throughout September, 1.26" (32mm) of precipitation is accumulated. Throughout the year, there are 153.2 rainfall days, and 13.15" (334mm) of precipitation is accumulated.Ocean temperature
In September, the average ocean temperature is 84°F (28.9°C).Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.
Daylight
The average length of the day in September in South Beach is 12h and 19min.On the first day of September, sunrise is at 7:00 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:08 pm EDT.
Sunshine
In South Beach, the average sunshine in September is 9h.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 7 translates into these guidelines:
Resist extreme sun exposure. Guarding against solar damage is essential. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Warning! Sand and water reflections boost the intensity of UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
South Beach, FL
- Average high temperature in September: 85.5°F
The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is January (70.2°F).
- Average low temperature in September: 77.4°F
The month with the highest average low temperature is August (78.6°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).
Average pressure in September
South Beach, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in September
South Beach, FL
- Average wind speed in September: 7.8mph
The windiest months (with the highest average wind speed) are January and November (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in September
South Beach, FL
- Average humidity in September: 78%
The months with the highest relative humidity are June, July and August (79%).
The month with the lowest relative humidity is March (72%).
Average rainfall in September
South Beach, FL
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is August (2.48").
The driest month (with the least rainfall) is February (0.39").
Average rainfall days in September
South Beach, FL
- Average rainfall days in September: 19.6 days
The month with the highest number of rainy days is August (20.2 days).
The month with the least rainy days is February (7.7 days).
Average sea temperature in September
South Beach, FL
- Average sea temperature in September: 84.1°F
The best month for swimming (with the highest average sea temperature) is August (84.8°F).
The coldest months (with the lowest average sea temperature) are January and February (72.3°F).
Average daylight in September /
Average sunshine in September
South Beach, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 0min).
Average sunshine days in September
South Beach, FL
- Average sunshine days in September: 6.3 days
The month with the most sunshine days is March (19.5 days).
The month with the least sunshine days is August (5.1 days).
Average UV index in September
South Beach, FL
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in September
South Beach, FL
- Average cloud cover in September: 30
The month with the most cloud cover is November (Cloud cover 36).
The months with the least cloud cover are May and August (Cloud cover 27).
Average visibility in September
South Beach, FL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
