September weather forecast and climate
Altus, AR

Weather in September

September, the first month of the autumn, in Altus, is still a warm month, with average temperature ranging between max 84°F (28.9°C) and min 62.4°F (16.9°C).

Temperature

In Altus, the average high-temperature in September slightly decreases, from a hot 91.4°F (33°C) in August, to a warm 84°F (28.9°C). The average low-temperature, in Altus, is 62.4°F (16.9°C).

Heat index

The average heat index is appraised at a tropical 91.2°F (32.9°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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', 'felt air temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, metabolic differences, pregnancy, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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.

Humidity

In September, the average relative humidity in Altus is 72%.

Rainfall

In Altus, Arkansas, during September, the rain falls for 9.8 days and regularly aggregates up to 2.36" (60mm) of precipitation. In Altus, during the entire year, the rain falls for 139.2 days and collects up to 34.57" (878mm) of precipitation.

Snowfall

April through November are months without snowfall in Altus.

Daylight

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

Sunshine

In September, the average sunshine is 9.3h.

UV index

In Altus, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
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 Altus?

In September, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 62.4°F (16.9°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that calculates temperature value influenced by the moisture in the air, is appraised at 91.2°F (32.9°C).

What is the average humidity in September in Altus?

The average relative humidity in September in Altus is 72%.

How many days does it rain in September in Altus?

In Altus, Arkansas, during September, the rain falls for 9.8 days and regularly aggregates up to 2.36" (60mm) of precipitation.

When it does not snow in Altus?

In Altus snow does not fall in April through November.

How many hours of daylight does Altus have in September?

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

How many hours of sunshine does Altus have in September?

In September, the average sunshine is 9.3h.

What is the UV index reading in September in Altus?

In September, the average daily maximum UV index in Altus is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Altus, AR

Average temperature in September - Altus, AR
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is July (92.7°F).
The month with the lowest average high temperature is January (46.9°F).

  • Average low temperature in September: 62.4°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).

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Average pressure in September
Altus, AR

Average pressure in September - Altus, 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 (29.93").

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Average wind speed in September
Altus, AR

Average wind speed in September - Altus, AR
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest month (with the lowest average wind speed) is July (4.4mph).

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Average humidity in September
Altus, AR

Average humidity in September - Altus, AR
  • Average humidity in September: 72%

Months with the highest relative humidity are March and May (78%).
Months with the lowest relative humidity are July and August (71%).

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Average rainfall in September
Altus, AR

Average rainfall in September - Altus, AR
  • Average rainfall in September: 2.36"

The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is July (2.17").

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Average rainfall days in September
Altus, AR

Average rainfall days in September - Altus, AR
  • Average rainfall days in September: 9.8 days

The month with the highest number of rainy days is March (15.2 days).
The month with the least rainy days is January (8.8 days).

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Average snowfall in September
Altus, AR

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

The month with the highest snowfall is January (0.71").
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
Altus, AR

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

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

Average daylight in September / Average sunshine in September - Altus, 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: 9.3h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 5.5h).

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Average sunshine days in September
Altus, AR

Average sunshine days in September - Altus, AR
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is December (20.1 days).
The month with the least sunshine days is April (13.8 days).

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Average UV index in September
Altus, AR

Average UV index in September - Altus, 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
Altus, AR

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

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in September
Altus, AR

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

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

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