September weather forecast and climate
Guernsey, AR

Weather in September

September, the first month of the autumn, in Guernsey, is still a hot month, with average temperature fluctuating between 86.9°F (30.5°C) and 65.7°F (18.7°C).

Temperature

In Guernsey, the average high-temperature slightly decreases, from a tropical 93°F (33.9°C) in August, to a still hot 86.9°F (30.5°C). The average low-temperature, in Guernsey, is 65.7°F (18.7°C).

Heat index

The average heat index in September is evaluated at a sweltering 97.3°F (36.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air 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, metabolic differences, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

August and September, with an average relative humidity of 70%, are the least humid months in Guernsey.

Rainfall

In Guernsey, during September, the rain falls for 11.3 days and regularly aggregates up to 1.54" (39mm) of precipitation. In Guernsey, Arkansas, during the entire year, the rain falls for 142 days and collects up to 27.17" (690mm) of precipitation.

Snowfall

In Guernsey, Arkansas, snow does not fall in April through December.

Daylight

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

Sunshine

In Guernsey, Arkansas, the average sunshine is 9.6h.

UV index

In Guernsey, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Guernsey?

The average high-temperature, in September, is 86.9°F (30.5°C), while the average low-temperature is 65.7°F (18.7°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that calculates temperature value influenced by the moisture in the air, in September is appraised at 97.3°F (36.3°C).

What are the least humid months in Guernsey?

August and September, with an average relative humidity of 70%, are the least humid months.

What is the average humidity in September in Guernsey?

The average relative humidity in September in Guernsey is 70%.

How many days does it rain in September in Guernsey?

In Guernsey, Arkansas, during September, the rain falls for 11.3 days and regularly aggregates up to 1.54" (39mm) of precipitation.

When it does not snow in Guernsey?

April through December are months without snowfall.

How many hours of daylight does Guernsey have in September?

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

How long on average sun shines in September in Guernsey?

The average sunshine in September in Guernsey is 9.6h.

How high is the UV index in September in Guernsey?

In September, the average daily maximum UV index in Guernsey is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Guernsey, AR

Average temperature in September - Guernsey, AR
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is July (93.4°F).
The month with the lowest average high temperature is January (51.4°F).

  • Average low temperature in September: 65.7°F

The month with the highest average low temperature is July (72.5°F).
The coldest month (with the lowest average low temperature) is January (35.4°F).

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Average pressure in September
Guernsey, AR

Average pressure in September - Guernsey, AR
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Guernsey, AR

Average wind speed in September - Guernsey, AR
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in September
Guernsey, AR

Average humidity in September - Guernsey, AR
  • Average humidity in September: 70%

Months with the highest relative humidity are February, March and December (80%).
Months with the lowest relative humidity are August and September (70%).

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Average rainfall in September
Guernsey, AR

Average rainfall in September - Guernsey, AR
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is April (3.07").
The driest month (with the least rainfall) is November (1.5").

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Average rainfall days in September
Guernsey, AR

Average rainfall days in September - Guernsey, AR
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is November (8.8 days).

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Average snowfall in September
Guernsey, AR

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

The month with the highest snowfall is February (0.55").
Months with the least snowfall are April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Guernsey, AR

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

The month with the highest number of snowfall days is February (1.7 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
Guernsey, AR

Average daylight in September / Average sunshine in September - Guernsey, 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: 10h).

  • Average sunshine in September: 9.6h

Months with the most sunshine are July and August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 5h).

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Average sunshine days in September
Guernsey, AR

Average sunshine days in September - Guernsey, AR
  • Average sunshine days in September: 16.7 days

Months with the most sunshine days are January and October (20 days).
The month with the least sunshine days is July (13.6 days).

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Average UV index in September
Guernsey, AR

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

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

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Average cloud cover in September
Guernsey, AR

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

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Guernsey, AR

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

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

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