September weather forecast
Raleigh, NC

The George Washington statue overlooking the city buildings of Raleigh, North Carolina
The George Washington statue overlooking the city buildings of Raleigh, North Carolina

Weather in September

September, the first month of the autumn in Raleigh, is also a moderately hot month, with an average temperature varying between 81.7°F (27.6°C) and 64.4°F (18°C).

Temperature

In September, the average high-temperature slightly decreases from a hot 87.3°F (30.7°C) in August to a moderately hot 81.7°F (27.6°C). In Raleigh, the average low-temperature is 64.4°F (18°C).

Heat index

In September, the average heat index is estimated at a tropical 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. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, pregnancy, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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

The months with the highest humidity are May, September and December, with an average relative humidity of 76%.

Rainfall

In Raleigh, during September, the rain falls for 13.4 days and regularly aggregates up to 2.76" (70mm) of precipitation. In Raleigh, during the entire year, the rain falls for 163.2 days and collects up to 32.2" (818mm) of precipitation.

Snowfall

April through October are months without snowfall in Raleigh, North Carolina.

Daylight

The average length of the day in September is 12h and 23min.
On the first day of the month, sunrise is at 6:46 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:08 am and sunset at 7:00 pm EDT.

Sunshine

The average sunshine in September in Raleigh is 9.1h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Raleigh?

In September, in Raleigh, the average high-temperature is 81.7°F (27.6°C), and the average low-temperature is 64.4°F (18°C). in September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the most humid month in Raleigh?

The months with the highest humidity in Raleigh, North Carolina, are May, September and December, with an average relative humidity of 76%.

What is the average humidity in September in Raleigh?

The average relative humidity in September is 76%.

How many days does it rain in September in Raleigh?

In September, in Raleigh, the rain falls for 13.4 days. Throughout September, 2.76" (70mm) of precipitation is accumulated.

When it does not snow in Raleigh?

In Raleigh, snow does not fall in April through October.

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

In September, the average day length in Raleigh, North Carolina, is 12h and 23min.

When are sunrise and sunset in September in Raleigh?

In September, on the first day of the month, sunrise is at 6:46 am and sunset at 7:42 pm. On the last day of the month, in Raleigh, sunrise is at 7:08 am and sunset at 7:00 pm EDT.

How many hours of sunshine does Raleigh have in September?

In Raleigh, North Carolina, the average sunshine duration in September is 9.1h.

What is the UV index reading in September in Raleigh?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
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
Raleigh, NC

Average temperature in September - Raleigh, NC
  • Average high temperature in September: 81.7°F

The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (48°F).

  • Average low temperature in September: 64.4°F

The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (32.9°F).

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Average pressure in September
Raleigh, NC

Average pressure in September - Raleigh, 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
Raleigh, NC

Average wind speed in September - Raleigh, NC
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in September
Raleigh, NC

Average humidity in September - Raleigh, NC
  • Average humidity in September: 76%

The months with the highest relative humidity are May, September and December (76%).
The months with the lowest relative humidity are January, March, April, June, July and November (73%).

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Average rainfall in September
Raleigh, NC

Average rainfall in September - Raleigh, NC
  • Average rainfall in September: 2.76"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is October (2.13").

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Average rainfall days in September
Raleigh, NC

Average rainfall days in September - Raleigh, NC
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is November (9.1 days).

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Average snowfall in September
Raleigh, NC

Average snowfall in September - Raleigh, NC
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.46").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Raleigh, NC

Average snowfall days in September - Raleigh, NC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.1 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
Raleigh, NC

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

The month with the longest days is June (Average daylight: 14h and 33min).
The month with the shortest days is December (Average daylight: 9h and 47min).

  • Average sunshine in September: 9h and 6min

The months with the most sunshine are June and July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in September
Raleigh, NC

Average sunshine days in September - Raleigh, NC
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (10.5 days).

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Average UV index in September
Raleigh, NC

Average UV index in September - Raleigh, NC
  • Average UV index in September: 5

The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).

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Average cloud cover in September
Raleigh, NC

Average cloud cover in September - Raleigh, NC
  • Average cloud cover in September: 35

The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 30).

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Average visibility in September
Raleigh, NC

Average visibility in September - Raleigh, 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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