September weather forecast
Altus, AR

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Weather in September

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

Temperature

As August transitions into September, Altus sees a gentle drop in the average high-temperature, transitioning from a hot 91.4°F (33°C) to a warm 84°F (28.9°C). In the face of high daytime temperatures, Altus witnesses a consistent average nighttime low of 62.4°F (16.9°C) during September.

Heat index

Throughout September, the heat index is evaluated at a tropical 91.4°F (33°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.

Humidity

The average relative humidity in September is 72%.

Rainfall

In Altus, during September, the rain falls for 9.8 days and regularly aggregates up to 2.36" (60mm) of precipitation. Throughout the year, there are 139.2 rainfall days, and 34.57" (878mm) of precipitation is accumulated.

Snowfall

In Altus, snow does not fall in April through November.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of September, sunrise is at 6:47 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:59 pm CDT.

Sunshine

In Altus, the average sunshine in September is 9.3h.

UV index

In Altus, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 5 in September translates into these instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.

Frequently asked questions

How hot is it in September?

September temperatures vary between a high-temperature of 84°F (28.9°C) and a low-temperature of 62.4°F (16.9°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 72%.

How much does it rain in September?

In September, the rain falls for 9.8 days. Throughout September, 2.36" (60mm) of precipitation is accumulated.

When it does not snow?

In Altus, snow does not fall in April through November.

What is the average length of the day in September?

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

What time are sunrise and sunset in September in Altus?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:59 pm CDT.

How many hours of sunshine does Altus have in September?

In Altus, the average sunshine duration in September is 9.3h.

What is the UV index intensity in September?

In Altus, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
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
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).

Average pressure in September
Altus, AR

Average pressure in September - Altus, AR
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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).

Average humidity in September
Altus, AR

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

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

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").

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).

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").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Altus, AR

Average daylight in September / Average sunshine in September - Altus, AR
  • 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).

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).

Average UV index in September
Altus, AR

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

The 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).

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).

Average visibility in September
Altus, AR

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

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

Altus, Arkansas, USA

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