September weather forecastBelleair Bluffs, FL
September
Weather in September
The first month of the autumn, September, is also a hot month in Belleair Bluffs, Florida, with an average temperature ranging between min 77.9°F (25.5°C) and max 86.2°F (30.1°C).Temperature
On the advent of September, Belleair Bluffs's average high-temperature exhibits a minor adjustment to a still hot 86.2°F (30.1°C) from August's 87.6°F (30.9°C). The September average low temperature, marginally lower than the daytime high, records at a moderately hot 77.9°F (25.5°C).Heat index
The heat index value during September is appraised at a torrid 96.8°F (36°C). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.Bear in mind that the heat index values are determined for shaded areas and light breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.
Humidity
The average relative humidity in September is 74%.Rainfall
In Belleair Bluffs, in September, it is raining for 20.7 days, with typically 2.17" (55mm) of accumulated precipitation. Throughout the year, there are 149.9 rainfall days, and 16.18" (411mm) of precipitation is accumulated.Ocean temperature
In Belleair Bluffs, the average seawater temperature in September is 84.7°F (29.3°C).Note: Between the temperatures of 77°F (25°C) and 84.2°F (29°C), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.
Daylight
In Belleair Bluffs, the average length of the day in September is 12h and 19min.On the first day of September, sunrise is at 7:10 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:18 pm EDT.
Sunshine
In Belleair Bluffs, the average sunshine in September is 9.1h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Attention! UV strength is notably upped by the reflection of sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Belleair Bluffs, FL
- Average high temperature in September: 86.2°F
The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (65.8°F).
- Average low temperature in September: 77.9°F
The month with the highest average low temperature is August (80.6°F).
The coldest month (with the lowest average low temperature) is January (55.9°F).
Average pressure in September
Belleair Bluffs, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in September
Belleair Bluffs, FL
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are January and March (9.8mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in September
Belleair Bluffs, FL
- Average humidity in September: 74%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Belleair Bluffs, FL
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is August (3.07").
The driest month (with the least rainfall) is March (0.39").
Average rainfall days in September
Belleair Bluffs, FL
- Average rainfall days in September: 20.7 days
The month with the highest number of rainy days is August (22.7 days).
The month with the least rainy days is February (6.7 days).
Average sea temperature in September
Belleair Bluffs, FL
- Average sea temperature in September: 84.7°F
The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64°F).
Average daylight in September /
Average sunshine in September
Belleair Bluffs, 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 6min
The month with the most sunshine is May (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in September
Belleair Bluffs, FL
- Average sunshine days in September: 5.5 days
The month with the most sunshine days is January (22.8 days).
The month with the least sunshine days is August (5 days).
Average UV index in September
Belleair Bluffs, 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 month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Belleair Bluffs, FL
- Average cloud cover in September: 26
The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 20).
Average visibility in September
Belleair Bluffs, 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).





