September weather forecastHolly Hill, FL
September
Weather in September
September, the first month of the autumn in Holly Hill, is still a tropical month, with an average temperature varying between 86.2°F (30.1°C) and 75.9°F (24.4°C).Temperature
The transition into September shows a subtle variation to a still hot 86.2°F (30.1°C) from August's 89.2°F (31.8°C) in the average high-temperature. Holly Hill experiences a nighttime temperature average of 75.9°F (24.4°C) during September.Heat index
During September, the heat index is computed to be a fiery hot 98.6°F (37°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.Heat index guidelines indicate values are for light wind scenarios and shaded regions. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. 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 hold great significance to children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.
Humidity
The months with the highest humidity are July through September, with an average relative humidity of 77%.Rainfall
In Holly Hill, in September, during 22.1 rainfall days, 4.96" (126mm) of precipitation is typically accumulated. In Holly Hill, during the entire year, the rain falls for 196 days and collects up to 37.91" (963mm) of precipitation.Daylight
The average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 7:02 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:10 pm EDT.
Sunshine
In Holly Hill, the average sunshine in September is 8.8h.UV index
In Holly Hill, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 6 during September leads to these advisories:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Holly Hill, FL
- Average high temperature in September: 86.2°F
The warmest month (with the highest average high temperature) is August (89.2°F).
The month with the lowest average high temperature is January (66.4°F).
- Average low temperature in September: 75.9°F
The month with the highest average low temperature is August (78.1°F).
The coldest month (with the lowest average low temperature) is January (54.1°F).
Average pressure in September
Holly Hill, FL
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).
Average wind speed in September
Holly Hill, FL
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in September
Holly Hill, FL
- Average humidity in September: 77%
The months with the highest relative humidity are July, August and September (77%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Holly Hill, FL
- Average rainfall in September: 4.96"
The wettest month (with the highest rainfall) is August (6.1").
The driest month (with the least rainfall) is March (1.42").
Average rainfall days in September
Holly Hill, FL
- Average rainfall days in September: 22.1 days
The month with the highest number of rainy days is August (26.1 days).
The months with the least rainy days are February and December (11 days).
Average daylight in September /
Average sunshine in September
Holly Hill, 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 48min
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 0min).
Average sunshine days in September
Holly Hill, FL
- Average sunshine days in September: 5.2 days
The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is August (2.8 days).
Average UV index in September
Holly Hill, 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
Holly Hill, FL
- Average cloud cover in September: 29
The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is May (Cloud cover 27).
Average visibility in September
Holly Hill, 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).
