September weather forecast
Durham, NC

The amazing skyscape of Durham City in North Carolina
The amazing skyscape of Durham City in North Carolina

Weather in September

The first month of the autumn, September, is still a warm month in Durham, North Carolina, with an average temperature fluctuating between 63.3°F (17.4°C) and 82°F (27.8°C).

Temperature

In Durham, the average high-temperature in September slightly decreases from a tropical 87.8°F (31°C) in August to a moderately hot 82°F (27.8°C). The average low-temperature, in September, is 63.3°F (17.4°C).

Heat index

In September, the average heat index is estimated at a hot 87.8°F (31°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Durham, the average relative humidity in September is 75%.

Rainfall

In Durham, during 12.8 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, there are 150.7 rainfall days, and 29.41" (747mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Durham.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of September, sunrise is at 6:47 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 7:01 pm EDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Durham?

In Durham, North Carolina, in September, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 63.3°F (17.4°C). in September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is estimated at 87.8°F (31°C).

What is the average humidity in September in Durham?

In September, the average relative humidity in Durham, North Carolina, is 75%.

How much does it rain in Durham in September?

In September, the rain falls for 12.8 days. Throughout September, 2.17" (55mm) of precipitation is accumulated.

When it does not snow in Durham?

In Durham, snow does not fall in April through November.

What is the average length of the day in September in Durham?

In September, the average day length in Durham is 12h and 23min.

When is the sunrise / sunset in September in Durham?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:43 pm. On the last day of the month, in Durham, sunrise is at 7:09 am and sunset at 7:01 pm EDT.

How many hours of sunshine does Durham have in September?

In Durham, North Carolina, the average sunshine duration in September is 8.8h.

What is the UV index reading in September in Durham?

In Durham, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Durham, NC

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).

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Average pressure in September
Durham, NC

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).

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Average wind speed in September
Durham, NC

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).

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Average humidity in September
Durham, NC

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%).

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Average rainfall in September
Durham, NC

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").

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Average rainfall days in September
Durham, NC

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).

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Average snowfall in September
Durham, NC

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").

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Average snowfall days in September
Durham, NC

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).

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Average daylight in September /
Average sunshine in September
Durham, NC

Average daylight in September / Average sunshine in September - Durham, NC
  • Average daylight in September: 12h and 23min

The month with the longest days is June (Average daylight: 14h and 34min).
The month with the shortest days is December (Average daylight: 9h and 46min).

  • Average sunshine in September: 8h and 48min

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).

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Average sunshine days in September
Durham, NC

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).

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Average UV index in September
Durham, NC

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).

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Average cloud cover in September
Durham, NC

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).

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Average visibility in September
Durham, NC

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).

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