September weather forecastKnightdale, NC
September
Weather in September
The first month of the autumn, September, is still a warm month in Knightdale, North Carolina, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 81.5°F (27.5°C).Temperature
As September takes its course, Knightdale's average high-temperature registers at a warm 81.5°F (27.5°C), closely aligning with the preceding month. In the month of September, Knightdale's average low-temperature falls to an enjoyable 64°F (17.8°C).Heat index
In September, the heat index is estimated at a tropical 87.8°F (31°C). Continuing activity during long-lasting exposure might induce tiredness and result in heat cramps.The heat index's values are generally associated with conditions in shade and light breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is achieved by amalgamating air temperature with the relative humidity readings. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humidity
The months with the highest humidity are May, September and December, with an average relative humidity of 77%.Rainfall
In Knightdale, during September, the rain falls for 14.2 days and regularly aggregates up to 2.83" (72mm) of precipitation. Throughout the year, there are 168.7 rainfall days, and 33.19" (843mm) of precipitation is accumulated.Snowfall
In Knightdale, snow does not fall in April through October.Daylight
In Knightdale, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:46 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:58 pm EDT.
Sunshine
In Knightdale, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Knightdale, NC
- Average high temperature in September: 81.5°F
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (48°F).
- Average low temperature in September: 64°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (32.7°F).
Average pressure in September
Knightdale, 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
Knightdale, NC
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in September
Knightdale, NC
- Average humidity in September: 77%
The months with the highest relative humidity are May, September and December (77%).
The months with the lowest relative humidity are January and November (73%).
Average rainfall in September
Knightdale, NC
- Average rainfall in September: 2.83"
The wettest month (with the highest rainfall) is August (3.7").
The driest month (with the least rainfall) is October (2.2").
Average rainfall days in September
Knightdale, NC
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.5 days).
Average snowfall in September
Knightdale, NC
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Knightdale, 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
Knightdale, NC
- Average daylight in September: 12h and 24min
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 6min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Knightdale, NC
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in September
Knightdale, 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
Knightdale, NC
- Average cloud cover in September: 36
The months with the most cloud cover are February and March (Cloud cover 42).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in September
Knightdale, 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).
