September weather forecast
Treasure Island, FL

The perfect outline of the Treasure Island in Florida
The perfect outline of the Treasure Island in Florida

Weather in September

September, the first month of the autumn in Treasure Island, is still a hot month, with an average temperature fluctuating between 86.5°F (30.3°C) and 77.9°F (25.5°C).

Temperature

In Treasure Island, the average high-temperature in September is almost the same as in August - a still hot 86.5°F (30.3°C). The average low-temperature, is 77.9°F (25.5°C).

Heat index

The average heat index in September is appraised at a torrid 98.4°F (36.9°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in September in Treasure Island is 74%.

Rainfall

In Treasure Island, it is raining for 17.5 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, there are 122.3 rainfall days, and 9.45" (240mm) of precipitation is accumulated.

Ocean temperature

In Treasure Island, Florida, in September, the average water temperature is 84.7°F (29.3°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Treasure Island, the average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:09 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:18 pm EDT.

Sunshine

In September, the average sunshine in Treasure Island is 9.2h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Treasure Island, Florida. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Treasure Island?

In Treasure Island, in September, the average high-temperature is 86.5°F (30.3°C), and the average low-temperature is 77.9°F (25.5°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, in September is appraised at 98.4°F (36.9°C).

What is the average humidity in September in Treasure Island?

In September, the average relative humidity is 74%.

How many days does it rain in September in Treasure Island?

In Treasure Island, Florida, in September, it is raining for 17.5 days, with typically 1.02" (26mm) of accumulated precipitation.

What is the ocean temperature in September in Treasure Island?

In Treasure Island, Florida, in September, the average water temperature is 84.7°F (29.3°C). 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.

What is the average length of the day in September in Treasure Island?

In Treasure Island, the average day length in September is 12h and 19min.

When are sunrise and sunset in September in Treasure Island?

In September, on the first day of the month, sunrise is at 7:09 am and sunset at 7:52 pm. On the last day of the month, in Treasure Island, sunrise is at 7:23 am and sunset at 7:18 pm EDT.

How long on average sun shines in September in Treasure Island?

The average sunshine duration in September in Treasure Island, Florida, is 9.2h.

What is the month with the highest UV index in Treasure Island?

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

How high is the UV index in September in Treasure Island?

The average daily maximum UV index in September in Treasure Island is 7. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Treasure Island, FL

Average temperature in September - Treasure Island, FL
  • Average high temperature in September: 86.5°F

The warmest month (with the highest average high temperature) is August (87.8°F).
The month with the lowest average high temperature is January (66.7°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 (56.3°F).

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Average pressure in September
Treasure Island, FL

Average pressure in September - Treasure Island, FL
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).

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Average wind speed in September
Treasure Island, FL

Average wind speed in September - Treasure Island, FL
  • Average wind speed in September: 7.9mph

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 (7mph).

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Average humidity in September
Treasure Island, FL

Average humidity in September - Treasure Island, 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%).

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Average rainfall in September
Treasure Island, FL

Average rainfall in September - Treasure Island, FL
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is August (1.85").
The driest month (with the least rainfall) is March (0.12").

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Average rainfall days in September
Treasure Island, FL

Average rainfall days in September - Treasure Island, FL
  • Average rainfall days in September: 17.5 days

The month with the highest number of rainy days is August (18.5 days).
The months with the least rainy days are January, February and March (5.6 days).

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Average sea temperature in September
Treasure Island, FL

Average sea temperature in September - Treasure Island, 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).

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Average daylight in September /
Average sunshine in September
Treasure Island, FL

Average daylight in September / Average sunshine in September - Treasure Island, FL
  • Average daylight in September: 12h and 19min

The month with the longest days is June (Average daylight: 13h and 52min).
The month with the shortest days is December (Average daylight: 10h and 25min).

  • Average sunshine in September: 9.2h

The month with the most sunshine is May (Average sunshine: 11.3h).
The month with the least sunshine is December (Average sunshine: 6.6h).

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Average sunshine days in September
Treasure Island, FL

Average sunshine days in September - Treasure Island, FL
  • Average sunshine days in September: 8 days

The month with the most sunshine days is March (24.3 days).
The month with the least sunshine days is August (5.6 days).

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Average UV index in September
Treasure Island, FL

Average UV index in September - Treasure Island, 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).

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Average cloud cover in September
Treasure Island, FL

Average cloud cover in September - Treasure Island, FL
  • Average cloud cover in September: 26

The months with the most cloud cover are January and December (Cloud cover 29).
The month with the least cloud cover is May (Cloud cover 20).

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Average visibility in September
Treasure Island, FL

Average visibility in September - Treasure Island, 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).

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