September weather forecast
Swannanoa, NC

Weather in September

The first month of the autumn, September, is still a warm month in Swannanoa, North Carolina, with average temperature ranging between min 55.8°F (13.2°C) and max 77.4°F (25.2°C).

Temperature

In Swannanoa, the average high-temperature is essentially the same as in August - a still warm 77.4°F (25.2°C). In September, in Swannanoa, the average low-temperature is 55.8°F (13.2°C).

Humidity

May and September, with an average relative humidity of 78%, are most humid months in Swannanoa.

Rainfall

September is the month with the least rainfall. Rain falls for 13.3 days and accumulates 1.54" (39mm) of precipitation.

Snowfall

May through October are months without snowfall in Swannanoa.

Daylight

In Swannanoa, the average length of the day is 12.4h.

Sunshine

The average sunshine in Swannanoa is 8.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 most humid month in Swannanoa?

Months with the highest humidity in Swannanoa are May and September, with an average relative humidity of 78%.

What is the average humidity in September in Swannanoa?

The average relative humidity in September is 78%.

What is the driest month in Swannanoa?

September is the month with the least rainfall in Swannanoa. Rain falls for 13.3 days and accumulates 1.54" (39mm) of precipitation.

How much does it rain in Swannanoa in September?

In Swannanoa, in September, during 13.3 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

When it does not snow in Swannanoa?

In Swannanoa snow does not fall in May through October.

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

In September, the average length of the day in Swannanoa is 12.4h.

How long on average sun shines in September in Swannanoa?

In Swannanoa, the average sunshine in September is 8.4h.

How high is the UV index in September in Swannanoa?

The average daily maximum UV index in September in Swannanoa is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Swannanoa, NC

Average temperature in September - Swannanoa, NC
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (43.5°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

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Average pressure in September
Swannanoa, NC

Average pressure in September - Swannanoa, NC
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.16").
The month with the lowest atmospheric pressure is June (29.99").

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Average wind speed in September
Swannanoa, NC

Average wind speed in September - Swannanoa, NC
  • Average wind speed in September: 3.8mph

The windiest months (with the highest average wind speed) are January, February and April (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).

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Average humidity in September
Swannanoa, NC

Average humidity in September - Swannanoa, NC
  • Average humidity in September: 78%

Months with the highest relative humidity are May and September (78%).
Months with the lowest relative humidity are January and November (74%).

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Average rainfall in September
Swannanoa, NC

Average rainfall in September - Swannanoa, NC
  • Average rainfall in September: 1.54"

The wettest months (with the highest rainfall) are April and December (3.07").
The driest month (with the least rainfall) is September (1.54").

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Average rainfall days in September
Swannanoa, NC

Average rainfall days in September - Swannanoa, NC
  • Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.5 days).

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Average snowfall in September
Swannanoa, NC

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

The month with the highest snowfall is December (4.37").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Swannanoa, NC

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

The month with the highest number of snowfall days is February (4.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Swannanoa, NC

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

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 8.4h

The month with the most sunshine is June (Average sunshine: 10.8h).
The month with the least sunshine is December (Average sunshine: 5.6h).

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Average sunshine days in September
Swannanoa, NC

Average sunshine days in September - Swannanoa, NC
  • Average sunshine days in September: 14.8 days

The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (10.4 days).

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Average UV index in September
Swannanoa, NC

Average UV index in September - Swannanoa, NC
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February and December (UV index 2).

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Average cloud cover in September
Swannanoa, NC

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

Months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 30).

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Average visibility in September
Swannanoa, NC

Average visibility in September - Swannanoa, NC
  • Average visibility in September: 5mi

Months with the highest visibility are June, July, August and November (6mi).
Months with the lowest visibility are January, February, March, April, May, September, October and December (5mi).

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