September weather forecast and climate
Belleair Bluffs, FL

September, the first month of the autumn, in Belleair Bluffs, is still a hot month, with temperature in the range of an average low of 77.9°F (25.5°C) and an average high of 86.2°F (30.1°C).

Temperature

In Belleair Bluffs, the average high-temperature in September is almost the same as in August - a still hot 86.2°F (30.1°C). The average low-temperature, in September, is 77.9°F (25.5°C).

Heat index

The average heat index is evaluated at a very hot 97.3°F (36.3°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, differences in body mass, height, and shape, metabolic differences, and pregnancy affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in September is 74%.

Rainfall

In Belleair Bluffs, during September, the rain falls for 20.7 days and regularly aggregates up to 2.17" (55mm) of precipitation. In Belleair Bluffs, during the entire year, the rain falls for 149.9 days and collects up to 16.18" (411mm) of precipitation.

Ocean temperature

In Belleair Bluffs, the average seawater temperature is 84.7°F (29.3°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in Belleair Bluffs is 12.3h.

Sunshine

In Belleair Bluffs, the average sunshine is 9.1h.

UV index

Months with the highest UV index in Belleair Bluffs are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Belleair Bluffs?

In September, the average high-temperature is 86.2°F (30.1°C), and the average low-temperature is 77.9°F (25.5°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that combines air temperature and relative humidity, is calculated to 97.3°F (36.3°C).

What is the average humidity in September in Belleair Bluffs?

In Belleair Bluffs, Florida, the average relative humidity in September is 74%.

How much does it rain in Belleair Bluffs in September?

In Belleair Bluffs, Florida, in September, it is raining for 20.7 days, with typically 2.17" (55mm) of accumulated precipitation.

What is the ocean temperature in September in Belleair Bluffs?

In September, the average ocean temperature is 84.7°F (29.3°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Belleair Bluffs have in September?

In Belleair Bluffs, the average length of the day in September is 12.3h.

How many hours of sunshine does Belleair Bluffs have in September?

In September, the average sunshine in Belleair Bluffs is 9.1h.

When is the highest UV index in Belleair Bluffs?

May through September, with an average maximum UV index of 7, are months with the highest UV index.

How high is the UV index in September in Belleair Bluffs?

In Belleair Bluffs, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays.
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"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is September (29.96").

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: 12.3h

The month with the longest days is June (Average daylight: 13.9h).
The month with the shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 9.1h

The month with the most sunshine is May (Average sunshine: 11.3h).
The month with the least sunshine is December (Average sunshine: 6.5h).

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

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

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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).