September weather forecast and climate
Holmes Beach, FL

Weather in September

The first month of the autumn, September, is still a tropical month in Holmes Beach, Florida, with average temperature fluctuating between 77.9°F (25.5°C) and 86.2°F (30.1°C).

Temperature

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

Heat index

The average heat index is evaluated at a torrid 97.9°F (36.6°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like pregnancy, differences in body mass, height, and shape, wind, and activity influence one's weather impression. 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. 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 cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. 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

In September, the average relative humidity in Holmes Beach is 75%.

Rainfall

In September, the rain falls for 21.5 days. Throughout September, 3.43" (87mm) of precipitation is accumulated. Throughout the year, in Holmes Beach, there are 166.4 rainfall days, and 26.38" (670mm) of precipitation is accumulated.

Ocean temperature

In Holmes Beach, the average water 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

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

Sunshine

The average sunshine is 9.1h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in Holmes Beach?

In September, in Holmes Beach, 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. 'apparent temperature', 'real feel'), that factores the actual air temperature with the relative humidity, is estimated at 97.9°F (36.6°C).

What is the average humidity in September in Holmes Beach?

In September, the average relative humidity in Holmes Beach, Florida, is 75%.

How many days does it rain in September in Holmes Beach?

In Holmes Beach, Florida, in September, it is raining for 21.5 days, with typically 3.43" (87mm) of accumulated precipitation.

How warm is the water in September in Holmes Beach?

In Holmes Beach, Florida, the average seawater temperature in September 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 Holmes Beach?

In September, the average length of the day in Holmes Beach, Florida, is 12.3h.

How many hours of sunshine does Holmes Beach have in September?

The average sunshine in September in Holmes Beach is 9.1h.

When is the highest UV index in Holmes Beach?

Months with the highest UV index in Holmes Beach, Florida, are May through September, with an average maximum UV index of 7.

What is the UV index intensity in September in Holmes Beach?

The average daily maximum UV index in September in Holmes Beach, Florida, is 7. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Holmes Beach, FL

Average temperature in September - Holmes Beach, FL
  • Average high temperature in September: 86.2°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 (66.9°F).

  • Average low temperature in September: 77.9°F

The month with the highest average low temperature is August (80.4°F).
The coldest month (with the lowest average low temperature) is January (56.8°F).

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Average pressure in September
Holmes Beach, FL

Average pressure in September - Holmes Beach, FL
  • Average pressure in September: 29.96"

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

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Average wind speed in September
Holmes Beach, FL

Average wind speed in September - Holmes Beach, FL
  • Average wind speed in September: 8.2mph

The windiest month (with the highest average wind speed) is November (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Holmes Beach, FL

Average humidity in September - Holmes Beach, FL
  • Average humidity in September: 75%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in September
Holmes Beach, FL

Average rainfall in September - Holmes Beach, FL
  • Average rainfall in September: 3.43"

The wettest month (with the highest rainfall) is July (4.88").
The driest month (with the least rainfall) is November (0.71").

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Average rainfall days in September
Holmes Beach, FL

Average rainfall days in September - Holmes Beach, FL
  • Average rainfall days in September: 21.5 days

Months with the highest number of rainy days are July and August (24.6 days).
The month with the least rainy days is January (7.3 days).

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Average sea temperature in September
Holmes Beach, FL

Average sea temperature in September - Holmes Beach, FL
  • Average sea temperature in September: 84.8°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 (64.1°F).

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Average daylight in September /
Average sunshine in September
Holmes Beach, FL

Average daylight in September / Average sunshine in September - Holmes Beach, 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: 11.1h).
The month with the least sunshine is December (Average sunshine: 6.5h).

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Average sunshine days in September
Holmes Beach, FL

Average sunshine days in September - Holmes Beach, FL
  • Average sunshine days in September: 6 days

The month with the most sunshine days is January (22.6 days).
Months with the least sunshine days are July and August (4.8 days).

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Average UV index in September
Holmes Beach, FL

Average UV index in September - Holmes Beach, 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).

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Average cloud cover in September
Holmes Beach, FL

Average cloud cover in September - Holmes Beach, FL
  • Average cloud cover in September: 27

Months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 21).

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Average visibility in September
Holmes Beach, FL

Average visibility in September - Holmes Beach, 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).

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