September weather forecast and climate
Winchester, AR

Weather in September

The first month of the autumn, September, is still a warm month in W"ter, Arkansas, with average temperature fluctuating between 85.8°F (29.9°C) and 66.7°F (19.3°C).

Temperature

In September, the average high-temperature is practically the same as in August - a moderately hot 85.8°F (29.9°C). In September, in W"ter, the average low-temperature is 66.7°F (19.3°C).

Heat index

In September, the average heat index is calculated to be a torrid 95°F (35°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, wind, clothing). 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 especially crucial for babies and toddlers. 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In W"ter, the average relative humidity is 71%.

Rainfall

September is the month with the least rainfall in W"ter. Rain falls for 12 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

In W"ter snow does not fall in April through October.

Daylight

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

Sunshine

The average sunshine in W"ter is 9.9h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 W"ter?

In W"ter, in September, the average high-temperature is 85.8°F (29.9°C), and the average low-temperature is 66.7°F (19.3°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in September is calculated to be 95°F (35°C).

What is the average humidity in September in W"ter?

In W"ter, the average relative humidity in September is 71%.

What is the driest month in W"ter?

September is the month with the least rainfall in W"ter, Arkansas. Rain falls for 12 days and accumulates 1.89" (48mm) of precipitation.

How many days does it rain in September in W"ter?

In September, in W"ter, the rain falls for 12 days. Throughout September, 1.89" (48mm) of precipitation is accumulated.

When it does not snow in W"ter?

April through October are months without snowfall in W"ter.

How many hours of daylight does W"ter have in September?

The average length of the day in September in W"ter, Arkansas, is 12.4h.

How long on average sun shines in September in W"ter?

The average sunshine in September is 9.9h.

What is the UV index intensity in September in W"ter?

The average daily maximum UV index in September in W"ter is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Winchester, AR

Average temperature in September - Winchester, AR
  • Average high temperature in September: 85.8°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (50.5°F).

  • Average low temperature in September: 66.7°F

The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (37°F).

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Average pressure in September
Winchester, AR

Average pressure in September - Winchester, AR
  • Average pressure in September: 30"

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
Winchester, AR

Average wind speed in September - Winchester, AR
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is February (9.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
Winchester, AR

Average humidity in September - Winchester, AR
  • Average humidity in September: 71%

The month with the highest relative humidity is March (79%).
The month with the lowest relative humidity is October (67%).

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Average rainfall in September
Winchester, AR

Average rainfall in September - Winchester, AR
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is April (4.37").
The driest month (with the least rainfall) is September (1.89").

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Average rainfall days in September
Winchester, AR

Average rainfall days in September - Winchester, AR
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is October (8.6 days).

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Average snowfall in September
Winchester, AR

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

The month with the highest snowfall is February (0.71").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Winchester, AR

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

The month with the highest number of snowfall days is February (1.3 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
Winchester, AR

Average daylight in September / Average sunshine in September - Winchester, AR
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days in September
Winchester, AR

Average sunshine days in September - Winchester, AR
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is October (21.1 days).
The month with the least sunshine days is July (11.9 days).

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Average UV index in September
Winchester, AR

Average UV index in September - Winchester, AR
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, February and December (UV index 3).

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Average cloud cover in September
Winchester, AR

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

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is June (Cloud cover 26).

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Average visibility in September
Winchester, AR

Average visibility in September - Winchester, AR
  • 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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