September weather forecastKeysville, FL
September
Weather in September
The first month of the autumn, September, is still a hot month in Keysville, Florida, with an average temperature ranging between max 88.2°F (31.2°C) and min 73.6°F (23.1°C).Temperature
Keysville marks the onset of September with an average high-temperature of a still hot 88.2°F (31.2°C), subtly divergent from August's 90°F (32.2°C). The temperature in Keysville dips to an average of 73.6°F (23.1°C) during September nights.Heat index
The average heat index in September is estimated at an extremely hot 105.8°F (41°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.Given the heat index, its values are aligned with shaded sites and gentle winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.
Humidity
August and September, with an average relative humidity of 79%, are the most humid months in Keysville.Rainfall
In Keysville, in September, during 20.6 rainfall days, 3.98" (101mm) of precipitation is typically accumulated. Throughout the year, there are 189 rainfall days, and 36.54" (928mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 19min.On the first day of September, sunrise is at 7:07 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:15 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. 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. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Keysville, FL
- Average high temperature in September: 88.2°F
The warmest month (with the highest average high temperature) is August (90°F).
The month with the lowest average high temperature is January (68.9°F).
- Average low temperature in September: 73.6°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (51.1°F).
Average pressure in September
Keysville, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in September
Keysville, FL
- Average wind speed in September: 5.2mph
The windiest months (with the highest average wind speed) are March and April (6.8mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in September
Keysville, FL
- Average humidity in September: 79%
The months with the highest relative humidity are August and September (79%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Keysville, FL
- Average rainfall in September: 3.98"
The wettest month (with the highest rainfall) is August (6.89").
The driest months (with the least rainfall) are January and November (1.18").
Average rainfall days in September
Keysville, FL
- Average rainfall days in September: 20.6 days
The month with the highest number of rainy days is July (26.8 days).
The month with the least rainy days is January (9.1 days).
Average daylight in September /
Average sunshine in September
Keysville, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is May (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days in September
Keysville, FL
- Average sunshine days in September: 7.8 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (2.9 days).
Average UV index in September
Keysville, 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 month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Keysville, FL
- Average cloud cover in September: 35
The months with the most cloud cover are February and December (Cloud cover 37).
The month with the least cloud cover is May (Cloud cover 29).
Average visibility in September
Keysville, 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).
