September weather forecastWest Palm Beach, FL
September
Weather in September
September in West Palm beach acts as a bridge connecting the hot summer with the milder seasons. The weather continues to be warm but begins to show signs of a shift in temperature trends. Notably, there is a drop in the amount of daylight hours which starts to impact outdoor activities. Expect the rainfall accumulation to begin normalizing, registering at 2.87" (73mm) throughout this month. The distinguishing feature of September remains the high temperature of 84.7°F (29.3°C), indicating a departure from the intense summer heat.Temperature
September's advent denotes a minor fluctuation in the average high-temperature to a moderately hot 84.7°F (29.3°C) from August's 86.5°F (30.3°C). West Palm Beach encounters a small divergence from daytime high temperatures, averaging a low-temperature of 80.4°F (26.9°C) during September nights.Heat index
September's mean heat index is estimated at a tropical 93.2°F (34°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.In terms of the heat index, values are set with light wind and shade conditions in mind. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', blends air temperature and moisture content to represent the felt temperature to humans. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Humidity
The average relative humidity in September in West Palm Beach is 75%.Rainfall
In West Palm Beach, during September, the rain falls for 25 days and regularly aggregates up to 2.87" (73mm) of precipitation. 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: Temperatures between 77°F (25°C) and 84.2°F (29°C) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.
Daylight
The average length of the day in September in West Palm Beach is 12h and 18min.On the first day of the month, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of September, in West Palm Beach, Florida, sunrise is at 7:12 am and sunset at 7:07 pm EDT.
Sunshine
In September, the average sunshine in West Palm Beach is 9h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 7 translates into these guidelines:
Fend off overexposure. Sun protection is vital. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take heed! Reflections of sand and water make the Sun's UV rays stronger.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
West Palm Beach, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).
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).
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%).
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").
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).
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).
Average daylight in September /
Average sunshine in September
West Palm Beach, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The months with the least sunshine are January and December (Average sunshine: 6h and 6min).
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).
Average UV index in September
West Palm Beach, 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 months with the lowest UV index are January and February (UV index 5).
Average cloud cover in September
West Palm Beach, FL
- Average cloud cover in September: 31
The months with the most cloud cover are January, November and December (Cloud cover 35).
The months with the least cloud cover are May, July and August (Cloud cover 28).
Average visibility in September
West Palm Beach, 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).
