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
The advent of September in Durham brings a subtle shift in temperature, with the average high moving from a tropical 87.8°F (31°C) in August to a warm 82°F (27.8°C). Durham throughout September, records an average low-temperature of 63.3°F (17.4°C).Heat index
The heat index for September is evaluated at a hot 87.8°F (31°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.Heat index determinations are made taking into account the shade and light air movements. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Humidity
The average relative humidity in September in Durham, North Carolina, is 75%.Rainfall
In Durham, during September, the rain falls for 12.8 days and regularly aggregates up to 2.17" (55mm) of precipitation. Throughout the year, in Durham, there are 150.7 rainfall days, and 29.41" (747mm) of precipitation is accumulated.Snowfall
April through November are months without snowfall.Daylight
In Durham, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:47 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 7:00 pm EDT.
Sunshine
The average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September in Durham is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Guard yourself - An obligation to protect skin and eyes from harm exists. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
What is the average September temperature in Durham?
What is the average humidity in September in Durham?
How many days does it rain in September in Durham?
When it does not snow in Durham?
What is the average length of the day in September in Durham?
When is the sunrise / sunset in September in Durham?
How long on average sun shines in September in Durham?
How high is the UV index in September in Durham?
Average temperature in September
Durham, NC
- Average high temperature in September: 82°F
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (47.7°F).
- Average low temperature in September: 63.3°F
The month with the highest average low temperature is July (70.2°F).
The coldest month (with the lowest average low temperature) is January (32.2°F).
Average pressure in September
Durham, NC
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Durham, NC
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Durham, NC
- Average humidity in September: 75%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (71%).
Average rainfall in September
Durham, NC
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is August (3.19").
The driest month (with the least rainfall) is October (1.89").
Average rainfall days in September
Durham, NC
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (7.7 days).
Average snowfall in September
Durham, NC
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.93").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Durham, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Durham, NC
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Durham, NC
- Average sunshine days in September: 16 days
The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is July (11.9 days).
Average UV index in September
Durham, NC
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Durham, NC
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in September
Durham, NC
- 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).
Durham, North Carolina, USA
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