September weather forecast
Cary, NC

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Weather in September

In September, the soothing signs of autumn start to manifest in Cary, with a decrease in temperature and daylight hours. September, much like the preceding month, records an average of 2.36" (60mm) of rainfall spread over 12.5 days. Despite shorter days, the nice weather is good for enjoying outdoor activities such as fishing or hiking. The lower humidity combined with somewhat cooler nights makes the weather pretty comfortable. The vibrant array of autumnal colors commences to stand out as leaves start to change.

Temperature

September brings a slight decrease in temperature, down from a tropical 87.4°F (30.8°C) in August to a warm 81.9°F (27.7°C). Cary registers a consistent average low-temperature of 63.9°F (17.7°C) during September.

Heat index

The heat index in September is calculated to be a tropical 87.8°F (31°C). If exposure and activity are sustained, they might cause a feeling of weariness, resulting in heat cramps.
Heat index's context suggests values are appropriate for shady areas and slight breezes. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.

Humidity

In Cary, the average relative humidity in September is 75%.

Rainfall

In Cary, during September, the rain falls for 12.5 days and regularly aggregates up to 2.36" (60mm) of precipitation. In Cary, during the entire year, the rain falls for 161.9 days and collects up to 31.18" (792mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Cary, North Carolina, 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 7:42 pm. On the last day of September, in Cary, sunrise is at 7:09 am and sunset at 6:59 pm EDT.

Sunshine

The average sunshine in September in Cary is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
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Frequently asked questions

What are September temperatures in Cary?

In Cary, 81.9°F (27.7°C) is the average high-temperature and 63.9°F (17.7°C) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in September is calculated to be 87.8°F (31°C).

What is the average humidity in September in Cary?

In Cary, North Carolina, the average relative humidity in September is 75%.

How many days does it rain in September in Cary?

In September, the rain falls for 12.5 days. Throughout September, 2.36" (60mm) of precipitation is accumulated.

When it does not snow in Cary?

In Cary, North Carolina, snow does not fall in April through October.

How many hours of daylight does Cary have in September?

In Cary, the average day length in September is 12h and 23min.

When is the sunrise / sunset in September in Cary?

On the first day of September in Cary, sunrise is at 6:47 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:59 pm EDT.

How many hours of sunshine does Cary have in September?

In Cary, the average sunshine duration in September is 9.2h.

How high is the UV index in September in Cary?

The average daily maximum UV index in September in Cary is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from 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
Cary, NC

Average temperature in September - Cary, NC
  • Average high temperature in September: 81.9°F

The warmest month (with the highest average high temperature) is July (89.8°F).
The month with the lowest average high temperature is January (48°F).

  • Average low temperature in September: 63.9°F

The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).

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Average pressure in September
Cary, NC

Average pressure in September - Cary, 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).

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Average wind speed in September
Cary, NC

Average wind speed in September - Cary, NC
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in September
Cary, NC

Average humidity in September - Cary, NC
  • Average humidity in September: 75%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in September
Cary, NC

Average rainfall in September - Cary, NC
  • Average rainfall in September: 2.36"

The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is October (2.17").

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Average rainfall days in September
Cary, NC

Average rainfall days in September - Cary, NC
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is November (9.1 days).

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Average snowfall in September
Cary, NC

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

The month with the highest snowfall is January (1.61").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Cary, NC

Average snowfall days in September - Cary, 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).

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

Average daylight in September / Average sunshine in September - Cary, 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 month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in September
Cary, NC

Average sunshine days in September - Cary, NC
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.3 days).

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Average UV index in September
Cary, NC

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

The month with the highest UV index is 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
Cary, NC

Average cloud cover in September - Cary, 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).

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Average visibility in September
Cary, NC

Average visibility in September - Cary, 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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Cary, North Carolina, USA

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