September weather forecast and climate
South Palm Beach, FL

Weather in September

The first month of the autumn, September, is also a moderately hot month in South Palm Beach, Florida, with temperature in the range of an average low of 80.1°F (26.7°C) and an average high of 85.1°F (29.5°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a moderately hot 85.1°F (29.5°C). In South Palm Beach, in September, the average low-temperature is 80.1°F (26.7°C).

Heat index

The average heat index is estimated at a tropical 95°F (35°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 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', 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 (wind, differences in body mass, height, and shape, pregnancy), 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 particularly important for children. 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.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In South Palm Beach, it is raining for 26.8 days, with typically 7.48" (190mm) of accumulated precipitation. In South Palm Beach, during the entire year, the rain falls for 238.3 days and collects up to 54.53" (1385mm) of precipitation.

Ocean temperature

In South Palm Beach, 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

The average length of the day in September is 12.3h.

Sunshine

In September, the average sunshine is 8.9h.

UV index

Months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in South Palm Beach?

The average high-temperature, in September, in South Palm Beach, Florida, is 85.1°F (29.5°C), while the average low-temperature is 80.1°F (26.7°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 95°F (35°C).

What is the average humidity in September in South Palm Beach?

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

How much does it rain in South Palm Beach in September?

In September, in South Palm Beach, Florida, the rain falls for 26.8 days. Throughout September, 7.48" (190mm) of precipitation is accumulated.

What is the water temperature in September in South Palm Beach?

In South Palm Beach, Florida, the average seawater temperature in September is 84.7°F (29.3°C). 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.

What is the average length of the day in September in South Palm Beach?

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

How long on average sun shines in September in South Palm Beach?

In September, the average sunshine is 8.9h.

When is the highest UV index in South Palm Beach?

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

What is the UV index reading in September in South Palm Beach?

In September, the average daily maximum UV index in South Palm Beach, Florida, is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
South Palm Beach, FL

Average temperature in September - South Palm Beach, FL
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is August (86.7°F).
The month with the lowest average high temperature is January (72.5°F).

  • Average low temperature in September: 80.1°F

The month with the highest average low temperature is August (81.5°F).
The coldest month (with the lowest average low temperature) is January (64°F).

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Average pressure in September
South Palm Beach, FL

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

The month with the highest atmospheric pressure is January (30.11").
Months with the lowest atmospheric pressure are September and October (29.96").

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Average wind speed in September
South Palm Beach, FL

Average wind speed in September - South Palm Beach, FL
  • Average wind speed in September: 8.5mph

The windiest month (with the highest average wind speed) is March (11.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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Average humidity in September
South Palm Beach, FL

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

Months with the highest relative humidity are June and December (76%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in September
South Palm Beach, FL

Average rainfall in September - South Palm Beach, FL
  • Average rainfall in September: 7.48"

The wettest month (with the highest rainfall) is August (9.06").
The driest month (with the least rainfall) is January (1.3").

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Average rainfall days in September
South Palm Beach, FL

Average rainfall days in September - South Palm Beach, FL
  • Average rainfall days in September: 26.8 days

The month with the highest number of rainy days is August (27.3 days).
The month with the least rainy days is February (13.3 days).

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Average sea temperature in September
South Palm Beach, FL

Average sea temperature in September - South Palm Beach, FL
  • Average sea temperature in September: 84.8°F

The best month for swimming (with the highest average sea temperature) is August (85.7°F).
The coldest month (with the lowest average sea temperature) is January (74.1°F).

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Average daylight in September /
Average sunshine in September
South Palm Beach, FL

Average daylight in September / Average sunshine in September - South Palm 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: 10.5h).

  • Average sunshine in September: 8.9h

Months with the most sunshine are July and August (Average sunshine: 10.7h).
Months with the least sunshine are January and December (Average sunshine: 6).

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Average sunshine days in September
South Palm Beach, FL

Average sunshine days in September - South Palm Beach, FL
  • Average sunshine days in September: 2.8 days

The month with the most sunshine days is March (12.7 days).
The month with the least sunshine days is July (2.3 days).

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Average UV index in September
South Palm Beach, FL

Average UV index in September - South Palm 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 5).

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Average cloud cover in September
South Palm Beach, FL

Average cloud cover in September - South Palm Beach, FL
  • Average cloud cover in September: 32

Months with the most cloud cover are January, October, November and December (Cloud cover 36).
Months with the least cloud cover are April and July (Cloud cover 29).

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Average visibility in September
South Palm Beach, FL

Average visibility in September - South Palm 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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