September weather forecast
West Palm Beach, FL

Tall, beautiful buildings reflected in the waterway in West Palm Beach, Florida
Tall, beautiful buildings reflected in the waterway in West Palm Beach, Florida

Weather in September

September, the first month of the autumn, in West Palm Beach, is also a moderately hot month, with average temperature fluctuating between 80.4°F (26.9°C) and 84.7°F (29.3°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a warm 84.7°F (29.3°C). The average low-temperature, in West Palm Beach, is 80.4°F (26.9°C).

Heat index

In September, the average heat index is evaluated at a tropical 93.9°F (34.4°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 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like metabolic differences, clothing, wind, and activity influence one's weather impression. 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 particularly important for children. 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.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In West Palm Beach, Florida,, during 25 rainfall days, 2.87" (73mm) of precipitation is typically accumulated. In West Palm Beach, during the entire year, the rain falls for 193.9 days and collects up to 22.56" (573mm) of precipitation.

Ocean temperature

In West 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

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

Sunshine

In West Palm Beach, Florida, the average sunshine is 9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in West Palm Beach, Florida. A UV Index reading of 6 to 7 represents a high health hazard from unprotected 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. 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 West Palm Beach?

In September, in West Palm Beach, the average high-temperature is 84.7°F (29.3°C), and the average low-temperature is 80.4°F (26.9°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in September is evaluated at 93.9°F (34.4°C).

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

The average relative humidity in September in West Palm Beach, Florida, is 75%.

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

In West Palm Beach, Florida, in September, it is raining for 25 days, with typically 2.87" (73mm) of accumulated precipitation.

How warm is the water in September in West Palm Beach?

In West Palm Beach, 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 West Palm Beach?

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

How many hours of sunshine does West Palm Beach have in September?

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

What is the month with the highest UV index in West Palm Beach?

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

How high is the UV index in September in West Palm Beach?

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

Average temperature in September
West Palm Beach, FL

Average temperature in September - West Palm Beach, FL
  • Average high temperature in September: 84.7°F

The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is January (72°F).

  • Average low temperature in September: 80.4°F

The month with the highest average low temperature is August (81.3°F).
The coldest month (with the lowest average low temperature) is January (64.2°F).

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Average pressure in September
West Palm Beach, FL

Average pressure in September - West 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
West Palm Beach, FL

Average wind speed in September - West Palm Beach, FL
  • Average wind speed in September: 8.8mph

The windiest month (with the highest average wind speed) is March (11.8mph).
The calmest month (with the lowest average wind speed) is July (8mph).

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Average humidity in September
West Palm Beach, FL

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

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

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Average rainfall in September
West Palm Beach, FL

Average rainfall in September - West Palm Beach, FL
  • Average rainfall in September: 2.87"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (0.51").

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Average rainfall days in September
West Palm Beach, FL

Average rainfall days in September - West Palm Beach, FL
  • Average rainfall days in September: 25 days

The month with the highest number of rainy days is September (25 days).
The month with the least rainy days is February (9.3 days).

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Average sea temperature in September
West Palm Beach, FL

Average sea temperature in September - West 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
West Palm Beach, FL

Average daylight in September / Average sunshine in September - West 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: 9h

The month with the most sunshine is July (Average sunshine: 11h).
Months with the least sunshine are January and December (Average sunshine: 6.1).

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Average sunshine days in September
West Palm Beach, FL

Average sunshine days in September - West Palm Beach, FL
  • Average sunshine days in September: 3.6 days

The month with the most sunshine days is January (18.2 days).
The month with the least sunshine days is August (3.5 days).

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Average UV index in September
West Palm Beach, FL

Average UV index in September - West 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).
Months with the lowest UV index are January and February (UV index 5).

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Average cloud cover in September
West Palm Beach, FL

Average cloud cover in September - West Palm Beach, FL
  • Average cloud cover in September: 31

Months with the most cloud cover are January, November and December (Cloud cover 35).
Months with the least cloud cover are May, July and August (Cloud cover 28).

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Average visibility in September
West Palm Beach, FL

Average visibility in September - West 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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