September weather forecastRoyal Palm Beach, FL
September
Weather in September
September, the first month of the autumn in Royal Palm Beach, is still a hot month, with an average temperature fluctuating between 86°F (30°C) and 78.4°F (25.8°C).Temperature
September brings an average high-temperature of a still tropical 86°F (30°C), nearly identical to the preceding month. During the nights of September, the average low-temperature holds at a warm 78.4°F (25.8°C).Heat index
September's mean heat index is estimated at a very hot 98.6°F (37°C). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.In the scope of the heat index, its values resonate with shade and light wind conditions. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.
Humidity
With an average relative humidity of 77%, September is the most humid month in Royal Palm Beach.Rainfall
In Royal Palm Beach, during September, the rain falls for 26.2 days and regularly aggregates up to 4.61" (117mm) of precipitation. In Royal Palm Beach, during the entire year, the rain falls for 218.6 days and collects up to 34.33" (872mm) of precipitation.Daylight
The average length of the day in September is 12h and 18min.On the first day of September in Royal Palm Beach, sunrise is at 7:00 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:08 pm EDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
The months with the highest UV index in Royal Palm Beach are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: During September, 7 as the daily maximum UV index converts into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Royal Palm Beach, FL
- Average high temperature in September: 86°F
The warmest month (with the highest average high temperature) is August (88.2°F).
The month with the lowest average high temperature is January (72.1°F).
- Average low temperature in September: 78.4°F
The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (61.3°F).
Average pressure in September
Royal 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
Royal Palm Beach, FL
- Average wind speed in September: 7.1mph
The windiest months (with the highest average wind speed) are January and March (9.6mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Royal Palm Beach, FL
- Average humidity in September: 77%
The month with the highest relative humidity is September (77%).
The month with the lowest relative humidity is March (69%).
Average rainfall in September
Royal Palm Beach, FL
- Average rainfall in September: 4.61"
The wettest month (with the highest rainfall) is August (5.94").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days in September
Royal Palm Beach, FL
- Average rainfall days in September: 26.2 days
The month with the highest number of rainy days is August (26.6 days).
The month with the least rainy days is January (11.3 days).
Average daylight in September /
Average sunshine in September
Royal 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 6min
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 12min).
Average sunshine days in September
Royal Palm Beach, FL
- Average sunshine days in September: 2.6 days
The month with the most sunshine days is January (14.7 days).
The month with the least sunshine days is August (2.1 days).
Average UV index in September
Royal 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
Royal Palm Beach, FL
- Average cloud cover in September: 29
The months with the most cloud cover are January, November and December (Cloud cover 34).
The months with the least cloud cover are April, May and July (Cloud cover 27).
Average visibility in September
Royal 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).
