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 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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Raleigh?
What are the most humid months in Raleigh?
What is the average humidity in September in Raleigh?
How many days does it rain in September in Raleigh?
When it does not snow in Raleigh?
What is the average length of the day in September in Raleigh?
What time are sunrise and sunset in September in Raleigh?
How long on average sun shines in September in Raleigh?
What is the UV index intensity in September in Raleigh?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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