September weather forecastSaint Augustine Beach, FL
September
Weather in September
September, the first month of the autumn in Saint Augustine Beach, is still a hot month, with an average temperature fluctuating between 86°F (30°C) and 75.9°F (24.4°C).Temperature
The start of September marks an average high-temperature of a still hot 86°F (30°C), hardly distinguishable from the conditions in August. In Saint Augustine Beach, an average temperature of 75.9°F (24.4°C) is noted during September nights.Heat index
September's mean heat index is calculated to be a fiery hot 98.6°F (37°C). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.When referencing the heat index, its values are suitable for shady environments and light breezes. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.
Humidity
In Saint Augustine Beach, the average relative humidity in September is 76%.Rainfall
In September, the rain falls for 19.8 days. Throughout September, 4.09" (104mm) of precipitation is accumulated. Throughout the year, there are 186.8 rainfall days, and 30.2" (767mm) of precipitation is accumulated.Snowfall
February through November are months without snowfall.Daylight
The average length of the day in September 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, sunrise is at 7:18 am and sunset at 7:11 pm EDT.
Sunshine
The average sunshine in September in Saint Augustine Beach is 8.6h.UV index
In September, the average daily maximum UV index in Saint Augustine Beach is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 6 suggests this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. 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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Augustine Beach, FL
- Average high temperature in September: 86°F
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (64°F).
- Average low temperature in September: 75.9°F
The month with the highest average low temperature is August (77.5°F).
The coldest month (with the lowest average low temperature) is January (51.4°F).
Average pressure in September
Saint Augustine Beach, FL
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.98"Hg).
Average wind speed in September
Saint Augustine Beach, FL
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Saint Augustine Beach, FL
- Average humidity in September: 76%
The months with the highest relative humidity are July, August and December (77%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Saint Augustine Beach, FL
- Average rainfall in September: 4.09"
The wettest month (with the highest rainfall) is August (4.33").
The driest month (with the least rainfall) is March (1.18").
Average rainfall days in September
Saint Augustine Beach, FL
- Average rainfall days in September: 19.8 days
The month with the highest number of rainy days is August (24.8 days).
The month with the least rainy days is February (10.3 days).
Average snowfall days in September
Saint Augustine 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 daylight in September /
Average sunshine in September
Saint Augustine Beach, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Saint Augustine Beach, FL
- Average sunshine days in September: 6.8 days
The month with the most sunshine days is March (17.9 days).
The month with the least sunshine days is August (4.4 days).
Average UV index in September
Saint Augustine Beach, FL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Saint Augustine Beach, FL
- Average cloud cover in September: 32
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
Saint Augustine 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).
