September weather forecast and climate
Jensen Beach, FL

Weather in September

The first month of the autumn, September, is still a warm month in Jensen Beach, Florida, with temperature in the range of an average high of 85.3°F (29.6°C) and an average low of 78.3°F (25.7°C).

Temperature

In Jensen Beach, the average high-temperature in September is almost the same as in August - a moderately hot 85.3°F (29.6°C). In Jensen Beach, the average low-temperature is 78.3°F (25.7°C).

Heat index

In September, the average heat index is calculated to a very hot 96.3°F (35.7°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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 surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Jensen Beach, during September, the rain falls for 22.6 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Jensen Beach, during the entire year, the rain falls for 168.1 days and collects up to 14.09" (358mm) of precipitation.

Ocean temperature

In Jensen Beach, the average water temperature is 84.4°F (29.1°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 September, the average length of the day in Jensen Beach is 12.3h.

Sunshine

The average sunshine in Jensen Beach 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 the UV radiation for the average person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
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. 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 Jensen Beach?

The average high-temperature, in September, is 85.3°F (29.6°C), while the average low-temperature is 78.3°F (25.7°C). The average heat index (a.k.a. 'real feel', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in September is calculated to 96.3°F (35.7°C).

What is the average humidity in September in Jensen Beach?

In Jensen Beach, the average relative humidity in September is 77%.

How much does it rain in Jensen Beach in September?

In Jensen Beach, during September, the rain falls for 22.6 days and regularly aggregates up to 1.5" (38mm) of precipitation.

How warm is the water in September in Jensen Beach?

In Jensen Beach, in September, the average water temperature is 84.4°F (29.1°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 Jensen Beach?

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

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

In Jensen Beach, Florida, the average sunshine in September is 9h.

When is the highest UV index in Jensen Beach?

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

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

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

Average temperature in September
Jensen Beach, FL

Average temperature in September - Jensen Beach, FL
  • Average high temperature in September: 85.3°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is January (71.4°F).

  • Average low temperature in September: 78.3°F

The month with the highest average low temperature is August (79.3°F).
The coldest month (with the lowest average low temperature) is January (61.2°F).

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Average pressure in September
Jensen Beach, FL

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

The month with the highest atmospheric pressure is January (30.12").
The month with the lowest atmospheric pressure is September (29.96").

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Average wind speed in September
Jensen Beach, FL

Average wind speed in September - Jensen Beach, FL
  • Average wind speed in September: 7.9mph

The windiest months (with the highest average wind speed) are January, March and November (10.3mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Jensen Beach, FL

Average humidity in September - Jensen Beach, FL
  • Average humidity in September: 77%

Months with the highest relative humidity are June and August (78%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in September
Jensen Beach, FL

Average rainfall in September - Jensen Beach, FL
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is August (2.56").
The driest month (with the least rainfall) is January (0.39").

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Average rainfall days in September
Jensen Beach, FL

Average rainfall days in September - Jensen Beach, FL
  • Average rainfall days in September: 22.6 days

The month with the highest number of rainy days is August (23.1 days).
The month with the least rainy days is February (7.7 days).

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Average sea temperature in September
Jensen Beach, FL

Average sea temperature in September - Jensen Beach, FL
  • Average sea temperature in September: 84.4°F

The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (73.3°F).

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

Average daylight in September / Average sunshine in September - Jensen Beach, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.8h).
The month with the shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 9h

Months with the most sunshine are July and August (Average sunshine: 10.9h).
Months with the least sunshine are January and December (Average sunshine: 6.1).

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Average sunshine days in September
Jensen Beach, FL

Average sunshine days in September - Jensen Beach, FL
  • Average sunshine days in September: 4.7 days

The month with the most sunshine days is January (19.5 days).
The month with the least sunshine days is August (3.4 days).

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Average UV index in September
Jensen Beach, FL

Average UV index in September - Jensen Beach, FL
  • Average UV index in September: 7

Months with the highest UV index are May, June, July, August and September (UV index 7).
Months with the lowest UV index are January and December (UV index 5).

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Average cloud cover in September
Jensen Beach, FL

Average cloud cover in September - Jensen Beach, FL
  • Average cloud cover in September: 29

Months with the most cloud cover are January, November and December (Cloud cover 34).
Months with the least cloud cover are May and July (Cloud cover 26).

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Average visibility in September
Jensen Beach, FL

Average visibility in September - Jensen 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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