September weather forecast
Greenbrier, AR

Weather in September

The first month of the autumn, September, is still a warm month in Greenbrier, Arkansas, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 83.5°F (28.6°C).

Temperature

In Greenbrier, the average high-temperature marginally drops, from a tropical 90.1°F (32.3°C) in August, to a moderately hot 83.5°F (28.6°C). In September, in Greenbrier, the average low-temperature is 63.1°F (17.3°C).

Heat index

The average heat index is computed to be a tropical 90.3°F (32.4°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, pregnancy, wind). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Greenbrier, the average relative humidity is 73%.

Rainfall

September is the month with the least rainfall. Rain falls for 9.7 days and accumulates 0.94" (24mm) of precipitation.

Snowfall

In Greenbrier snow does not fall in April through October.

Daylight

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

Sunshine

In Greenbrier, the average sunshine in September is 9.5h.

UV index

In September, the average daily maximum UV index in Greenbrier, Arkansas, is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 5 transform into the following instructions:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Greenbrier?

The average high-temperature, in September, is 83.5°F (28.6°C), while the average low-temperature is 63.1°F (17.3°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is computed to be 90.3°F (32.4°C).

What is the average humidity in September in Greenbrier?

In Greenbrier, Arkansas, the average relative humidity in September is 73%.

What is the driest month in Greenbrier?

The month with the least rainfall in Greenbrier is September when the rain falls for 9.7 days and typically collects 0.94" (24mm) of precipitation.

How much does it rain in Greenbrier in September?

In Greenbrier, Arkansas, in September, during 9.7 rainfall days, 0.94" (24mm) of precipitation is typically accumulated.

When it does not snow in Greenbrier?

In Greenbrier snow does not fall in April through October.

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

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

How long on average sun shines in September in Greenbrier?

In September, the average sunshine in Greenbrier is 9.5h.

How high is the UV index in September in Greenbrier?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Greenbrier, AR

Average temperature in September - Greenbrier, AR
  • Average high temperature in September: 83.5°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (46.9°F).

  • Average low temperature in September: 63.1°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (32.2°F).

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Average pressure in September
Greenbrier, AR

Average pressure in September - Greenbrier, AR
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in September
Greenbrier, AR

Average wind speed in September - Greenbrier, AR
  • Average wind speed in September: 5.2mph

The windiest months (with the highest average wind speed) are March and April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in September
Greenbrier, AR

Average humidity in September - Greenbrier, AR
  • Average humidity in September: 73%

The month with the highest relative humidity is March (79%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Greenbrier, AR

Average rainfall in September - Greenbrier, AR
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is September (0.94").

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Average rainfall days in September
Greenbrier, AR

Average rainfall days in September - Greenbrier, AR
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is October (7.2 days).

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Average snowfall in September
Greenbrier, AR

Average snowfall in September - Greenbrier, AR
  • Average snowfall in September: 0"

The month with the highest snowfall is March (0.24").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Greenbrier, AR

Average snowfall days in September - Greenbrier, AR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.5 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
Greenbrier, AR

Average daylight in September / Average sunshine in September - Greenbrier, AR
  • 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: 9.5h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 5.2h).

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Average sunshine days in September
Greenbrier, AR

Average sunshine days in September - Greenbrier, AR
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is October (21.6 days).
The month with the least sunshine days is July (14 days).

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Average UV index in September
Greenbrier, AR

Average UV index in September - Greenbrier, AR
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Greenbrier, AR

Average cloud cover in September - Greenbrier, AR
  • Average cloud cover in September: 28

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is June (Cloud cover 26).

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Average visibility in September
Greenbrier, AR

Average visibility in September - Greenbrier, AR
  • Average visibility in September: 6mi

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

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