September weather forecast
Raleigh, NC

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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 signals the gradual transition into autumn with temperatures moderating to a comfortable range. Fall enthusiasts can rejoice as the temperature averages lower from the scorching summer haze to a bearable 81.7°F (27.6°C). Rainfall frequency lessens, adding to the charm of the season. Despite the shortened daylight hours, the visibility remains unaffected, providing an unobstructed view of the fall foliage. Sunscreen continues to be a staple considering the persistent UV index.

Temperature

The transition into September involves a small decrease in the average high-temperature, dipping slightly from a tropical 87.3°F (30.7°C) in August to a warm 81.7°F (27.6°C). The mean low-temperature during September nights in Raleigh is a comfortable 64.4°F (18°C).

Heat index

The heat index for September is calculated to be a hot 87.8°F (31°C). If activity and exposure persist, they could induce fatigue, leading to possible heat cramps.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.

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

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

Daylight

In Raleigh, the average length of the day in September is 12h and 23min.
On the first day of the month, sunrise is at 6:47 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:59 pm EDT.

Sunshine

The average sunshine in September in Raleigh, North Carolina, is 9.1h.

UV index

In Raleigh, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature in Raleigh?

In Raleigh, 81.7°F (27.6°C) is the average high-temperature and 64.4°F (18°C) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in September is calculated to be 87.8°F (31°C).

What are the most humid months in Raleigh?

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

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 Raleigh, North Carolina, in September, it is raining for 13.4 days, with typically 2.76" (70mm) of accumulated precipitation.

When it does not snow in Raleigh?

April through October are months without snowfall in Raleigh.

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

The average day length in September is 12h and 23min.

What time are sunrise and sunset in September in Raleigh?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:59 pm EDT.

How long on average sun shines in September in Raleigh?

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

What is the UV index intensity in September in Raleigh?

In Raleigh, North Carolina, the average daily maximum UV index in September is 5. A UV Index 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 daylight
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).

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).

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).

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%).

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").

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).

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").

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).

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 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 9h and 1min

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).

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).

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).

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).

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).

Raleigh, North Carolina, USA

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