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 in September
- Average snowfall days 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
Jamestown's weather in September, with an average high-temperature of a warm 84.2°F (29°C), subtly shifts from August's 88.7°F (31.5°C). The temperature in Jamestown lowers to an average of 69.8°F (21°C) during September nights.Heat index
In September, the heat index is evaluated at a hot 93.2°F (34°C). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.Heat index specifics point out values are for conditions of shade and a slight breeze. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Humidity
In September, the average relative humidity is 77%.Rainfall
In Jamestown, in September, during 17.5 rainfall days, 4.13" (105mm) of precipitation is typically accumulated. Throughout the year, there are 179.5 rainfall days, and 40.79" (1036mm) of precipitation is accumulated.Snowfall
March through November are months without snowfall.Daylight
In Jamestown, the average length of the day in September is 12h and 22min.On the first day of September in Jamestown, South Carolina, sunrise is at 6:53 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:04 pm EDT.
Sunshine
In Jamestown, South Carolina, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September in Jamestown is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 6 transforms into these recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
How hot is September in Jamestown?
What is the average humidity in September in Jamestown?
How much does it rain in Jamestown in September?
When it does not snow in Jamestown?
What is the average length of the day in September in Jamestown?
When are sunrise and sunset in September in Jamestown?
How long on average sun shines in September in Jamestown?
How high is the UV index in September in Jamestown?
Average temperature in September
Jamestown, SC
- Average high temperature in September: 84.2°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (55.8°F).
- Average low temperature in September: 69.8°F
The month with the highest average low temperature is July (74.8°F).
The coldest month (with the lowest average low temperature) is January (40.8°F).
Average pressure in September
Jamestown, SC
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Jamestown, SC
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Jamestown, SC
- Average humidity in September: 77%
The months with the highest relative humidity are August and December (78%).
The months with the lowest relative humidity are January and March (74%).
Average rainfall in September
Jamestown, SC
- Average rainfall in September: 4.13"
The wettest month (with the highest rainfall) is August (6.46").
The driest month (with the least rainfall) is January (1.46").
Average rainfall days in September
Jamestown, SC
- Average rainfall days in September: 17.5 days
The months with the highest number of rainy days are July and August (23.2 days).
The month with the least rainy days is November (8.9 days).
Average snowfall in September
Jamestown, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.24").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Jamestown, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Jamestown, SC
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Jamestown, SC
- Average sunshine days in September: 10 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (5.5 days).
Average UV index in September
Jamestown, SC
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Jamestown, SC
- Average cloud cover in September: 29
The months with the most cloud cover are February and December (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Jamestown, SC
- 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).
Jamestown, South Carolina, USA
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