September weather forecast and climate
Knightdale, NC

Weather in September

The first month of the autumn, September, is also a moderately hot month in Knightdale, North Carolina, with average temperature varying between 81.5°F (27.5°C) and 64°F (17.8°C).

Temperature

In Knightdale, North Carolina, the average high-temperature is essentially the same as in August - a moderately hot 81.5°F (27.5°C). In Knightdale, the average low-temperature is 64°F (17.8°C).

Heat index

The average heat index is estimated at a tropical 86.9°F (30.5°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 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', 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 (wind, clothing, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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

May, September and December, with an average relative humidity of 77%, are most humid months.

Rainfall

In September, the rain falls for 14.2 days. Throughout September, 2.83" (72mm) of precipitation is accumulated. In Knightdale, during the entire year, the rain falls for 168.7 days and collects up to 33.19" (843mm) of precipitation.

Snowfall

In Knightdale snow does not fall in April through October.

Daylight

The average length of the day in September is 12.4h.

Sunshine

The average sunshine in September is 9.1h.

UV index

The average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Knightdale?

In Knightdale, North Carolina, in September, the average high-temperature is 81.5°F (27.5°C), and the average low-temperature is 64°F (17.8°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, is estimated at 86.9°F (30.5°C).

What are the most humid months in Knightdale?

May, September and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in September in Knightdale?

In Knightdale, North Carolina, the average relative humidity in September is 77%.

How many days does it rain in September in Knightdale?

In Knightdale, in September, it is raining for 14.2 days, with typically 2.83" (72mm) of accumulated precipitation.

When it does not snow in Knightdale?

April through October are months without snowfall.

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

In September, the average length of the day in Knightdale, North Carolina, is 12.4h.

How many hours of sunshine does Knightdale have in September?

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

What is the UV index reading in September in Knightdale?

In September, the average daily maximum UV index in Knightdale, North Carolina, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Knightdale, NC

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).

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Average pressure in September
Knightdale, NC

Average pressure in September - Knightdale, NC
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is November (30.15").
The month with the lowest atmospheric pressure is June (29.96").

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Average wind speed in September
Knightdale, NC

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).

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Average humidity in September
Knightdale, NC

Average humidity in September - Knightdale, NC
  • Average humidity in September: 77%

Months with the highest relative humidity are May, September and December (77%).
Months with the lowest relative humidity are January and November (73%).

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Average rainfall in September
Knightdale, NC

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").

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Average rainfall days in September
Knightdale, NC

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).

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Average snowfall in September
Knightdale, NC

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

The month with the highest snowfall is January (1.42").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Knightdale, NC

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).
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
Knightdale, NC

Average daylight in September / Average sunshine in September - Knightdale, NC
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 9.1h

The month with the most sunshine is June (Average sunshine: 10.8h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in September
Knightdale, NC

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).

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Average UV index in September
Knightdale, NC

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

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
Knightdale, NC

Average cloud cover in September - Knightdale, NC
  • Average cloud cover in September: 36

Months with the most cloud cover are February and March (Cloud cover 42).
Months with the least cloud cover are June and July (Cloud cover 31).

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Average visibility in September
Knightdale, NC

Average visibility in September - Knightdale, NC
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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