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
September ushers in a minute temperature change, with average high-temperatures reducing from August's tropical 87.8°F (31°C) to a moderately hot 82°F (27.8°C). Durham observes an average low-temperature of 63.3°F (17.4°C) during September nights.Heat index
For most parts of September, the heat index is calculated to be a tropical 87.8°F (31°C). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.For clarity, heat index numbers account for light winds and areas under shade. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. 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 are extremely significant for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
In September, the average relative humidity is 75%.Rainfall
In September, the rain falls for 12.8 days. Throughout September, 2.17" (55mm) of precipitation is accumulated. In Durham, during the entire year, the rain falls for 150.7 days and collects up to 29.41" (747mm) of precipitation.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:10 am and sunset at 7:00 pm EDT.
Sunshine
The average sunshine in September is 8.8h.UV index
In Durham, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 5 during September translates into these guidelines:
Prioritize safety - Suggestions to prevent sun damage are offered. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September in Durham?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September in Durham?
When is the sunrise / sunset in September?
How many hours of sunshine does Durham have in September?
What is the UV index reading 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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