September weather forecast
Castalia, NC

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Weather in September

September, the first month of the autumn in Castalia, is also a moderately hot month, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 81.3°F (27.4°C).

Temperature

The transition into September reveals an average high-temperature of a warm 81.3°F (27.4°C), mirroring a close resemblance to August. An average low-temperature of 64°F (17.8°C) is noted during the nights in September in Castalia, North Carolina.

Heat index

The heat index in September is estimated at a hot 86°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
The metrics for the heat index are tailored for both shady environments and light winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.

Humidity

With an average relative humidity of 78%, September is the most humid month in Castalia.

Rainfall

In Castalia, North Carolina, during September, the rain falls for 13.8 days and regularly aggregates up to 2.95" (75mm) of precipitation. In Castalia, North Carolina, during the entire year, the rain falls for 160.1 days and collects up to 33.11" (841mm) of precipitation.

Snowfall

April through November are months without snowfall in Castalia.

Daylight

The average length of the day in September is 12h and 24min.
On the first day of September in Castalia, sunrise is at 6:44 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:56 pm EDT.

Sunshine

In Castalia, the average sunshine in September is 8.8h.

UV index

In Castalia, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Enhance your sun protection with tightly woven, yet airy clothing.
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Frequently asked questions

What are September temperatures in Castalia?

The average high-temperature, in September, in Castalia, is 81.3°F (27.4°C), while the average low-temperature is 64°F (17.8°C). The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 86°F (30°C).

What is the most humid month in Castalia?

September is the most humid month in Castalia, with an average relative humidity of 78%.

What is the average humidity in September in Castalia?

The average relative humidity in September is 78%.

How many days does it rain in September in Castalia?

In September, in Castalia, the rain falls for 13.8 days. Throughout September, 2.95" (75mm) of precipitation is accumulated.

When it does not snow in Castalia?

April through November are months without snowfall in Castalia, North Carolina.

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

In Castalia, North Carolina, the average day length in September is 12h and 24min.

What time are sunrise and sunset in September in Castalia?

In September, on the first day of the month, sunrise is at 6:44 am and sunset at 7:39 pm. On the last day of the month, in Castalia, sunrise is at 7:07 am and sunset at 6:56 pm EDT.

How long on average sun shines in September in Castalia?

In Castalia, North Carolina, the average sunshine duration in September is 8.8h.

What is the UV index reading in September in Castalia?

In Castalia, North Carolina, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health risk 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
Castalia, NC

Average temperature in September - Castalia, NC
  • Average high temperature in September: 81.3°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (47.7°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 (32.5°F).

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Average pressure in September
Castalia, NC

Average pressure in September - Castalia, NC
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).

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Average wind speed in September
Castalia, NC

Average wind speed in September - Castalia, NC
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
Castalia, NC

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

The month with the highest relative humidity is September (78%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in September
Castalia, NC

Average rainfall in September - Castalia, NC
  • Average rainfall in September: 2.95"

The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is October (2.13").

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Average rainfall days in September
Castalia, NC

Average rainfall days in September - Castalia, NC
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is November (8.6 days).

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Average snowfall in September
Castalia, NC

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

The month with the highest snowfall is January (1.54").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Castalia, NC

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

The month with the highest number of snowfall days is February (2 days).
The 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
Castalia, NC

Average daylight in September / Average sunshine in September - Castalia, NC
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Castalia, NC

Average sunshine days in September - Castalia, NC
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is October (20 days).
The month with the least sunshine days is July (9.8 days).

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Average UV index in September
Castalia, NC

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

The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 2).

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Average cloud cover in September
Castalia, NC

Average cloud cover in September - Castalia, NC
  • Average cloud cover in September: 38

The months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 32).

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Average visibility in September
Castalia, NC

Average visibility in September - Castalia, 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).

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Castalia, North Carolina, USA

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