Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The advent of September brings an average high-temperature of a warm 85.8°F (29.9°C), exhibiting minor difference from the previous month. In the month of September, Jacksonville Beach's average low-temperature falls to a still moderately hot 75.4°F (24.1°C).Heat index
September's mean heat index is estimated at a very hot 96.8°F (36°C). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.Be aware that heat index ratings are designed for shaded locations and minor breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', blends air temperature and moisture content to represent the felt temperature to humans. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Jacksonville Beach, in September, during 20 rainfall days, 4.09" (104mm) of precipitation is typically accumulated. In Jacksonville Beach, Florida, during the entire year, the rain falls for 185.5 days and collects up to 31.54" (801mm) of precipitation.Snowfall
February through November are months without snowfall in Jacksonville Beach.Ocean temperature
In Jacksonville Beach, the average seawater temperature in September is 82.8°F (28.2°C).Note: For swimming, diving, or other water activities, temperatures from 77°F (25°C) to 84.2°F (29°C) provide the most enjoyable experience for extended periods without discomfort.
Daylight
The average length of the day in September in Jacksonville Beach is 12h and 20min.On the first day of the month, sunrise is at 7:02 am and sunset at 7:47 pm. On the last day of September, in Jacksonville Beach, Florida, sunrise is at 7:18 am and sunset at 7:11 pm EDT.
Sunshine
The average sunshine in September in Jacksonville Beach is 8.7h.UV index
The months with the highest UV index in Jacksonville Beach, Florida, are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 7 in September translates into the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Attention! The reflection of both water and sand can increase the intensity of UV rays.
Frequently asked questions
Is it hot in Jacksonville Beach during September?
What is the average humidity in September in Jacksonville Beach?
How much does it rain in Jacksonville Beach in September?
When it does not snow in Jacksonville Beach?
How warm is the water in September in Jacksonville Beach?
How many hours of daylight does Jacksonville Beach have in September?
When is the sunrise / sunset in September in Jacksonville Beach?
How many hours of sunshine does Jacksonville Beach have in September?
What is the month with the highest UV index in Jacksonville Beach?
What is the UV index intensity in September in Jacksonville Beach?
Average temperature in September
Jacksonville Beach, FL
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (63.3°F).
- Average low temperature in September: 75.4°F
The months with the highest average low temperature are July and August (77.5°F).
The coldest month (with the lowest average low temperature) is January (50.4°F).
Average pressure in September
Jacksonville Beach, FL
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are August and September (29.98"Hg).
Average wind speed in September
Jacksonville Beach, FL
- Average wind speed in September: 7.2mph
The windiest months (with the highest average wind speed) are January, March, April, October and November (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Jacksonville Beach, FL
- Average humidity in September: 75%
The months with the highest relative humidity are August and December (76%).
The month with the lowest relative humidity is March (70%).
Average rainfall in September
Jacksonville Beach, FL
- Average rainfall in September: 4.09"
The wettest month (with the highest rainfall) is August (4.8").
The driest month (with the least rainfall) is January (1.3").
Average rainfall days in September
Jacksonville Beach, FL
- Average rainfall days in September: 20 days
The month with the highest number of rainy days is August (25.3 days).
The month with the least rainy days is February (9.8 days).
Average snowfall days in September
Jacksonville Beach, FL
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Jacksonville Beach, FL
- Average sea temperature in September: 82.8°F
The best month for swimming (with the highest average sea temperature) is August (83.2°F).
The coldest months (with the lowest average sea temperature) are January and February (60.7°F).
Average daylight in September /
Average sunshine in September
Jacksonville Beach, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 8h and 4min
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: 5h and 54min).
Average sunshine days in September
Jacksonville Beach, FL
- Average sunshine days in September: 7.2 days
The month with the most sunshine days is January (18.8 days).
The month with the least sunshine days is August (4.2 days).
Average UV index in September
Jacksonville 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 December (UV index 4).
Average cloud cover in September
Jacksonville Beach, FL
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 38).
The month with the least cloud cover is May (Cloud cover 26).
Average visibility in September
Jacksonville 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).
Jacksonville Beach, Florida, USA
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