September weather forecast
Altheimer, AR

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Weather in September

September, the first month of the autumn in Altheimer, is still a warm month, with an average temperature ranging between min 66.2°F (19°C) and max 85.8°F (29.9°C).

Temperature

With the start of September, Altheimer measures an average high-temperature of a warm 85.8°F (29.9°C), not significantly differing from August's 90.7°F (32.6°C). Altheimer, in September, experiences an average temperature of 66.2°F (19°C) at night.

Heat index

For September, the heat index is estimated at a very hot 95°F (35°C). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
When referencing the heat index, its values are suitable for shady environments and light breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In September, the average relative humidity in Altheimer is 71%.

Rainfall

In September, the rain falls for 9.8 days. Throughout September, 1.22" (31mm) of precipitation is accumulated. Throughout the year, there are 130.3 rainfall days, and 18.54" (471mm) of precipitation is accumulated.

Snowfall

In Altheimer, Arkansas, snow does not fall in March through December.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of September, sunrise is at 6:41 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:52 pm CDT.

Sunshine

In Altheimer, the average sunshine in September is 9.7h.

UV index

In Altheimer, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Updated: Jul 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

The average high-temperature, in September, in Altheimer, is 85.8°F (29.9°C), while the average low-temperature is 66.2°F (19°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 95°F (35°C).

What is the average humidity in September?

The average relative humidity in September is 71%.

How much does it rain in September?

In Altheimer, in September, during 9.8 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

When it does not snow in Altheimer?

In Altheimer, Arkansas, snow does not fall in March through December.

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:41 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:52 pm CDT.

How many hours of sunshine does Altheimer have in September?

In Altheimer, the average sunshine duration in September is 9.7h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability 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
Altheimer, AR

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

The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is January (49.8°F).

  • Average low temperature in September: 66.2°F

The month with the highest average low temperature is July (72.7°F).
The coldest month (with the lowest average low temperature) is January (35.6°F).

Average pressure in September
Altheimer, AR

Average pressure in September - Altheimer, AR
  • Average pressure in September: 30"Hg

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

Average wind speed in September
Altheimer, AR

Average wind speed in September - Altheimer, AR
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September
Altheimer, AR

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

The months with the highest relative humidity are February, March and December (78%).
The month with the lowest relative humidity is October (68%).

Average rainfall in September
Altheimer, AR

Average rainfall in September - Altheimer, AR
  • Average rainfall in September: 1.22"

The wettest month (with the highest rainfall) is April (1.93").
The driest month (with the least rainfall) is November (0.91").

Average rainfall days in September
Altheimer, AR

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

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is November (6.8 days).

Average snowfall in September
Altheimer, AR

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

The month with the highest snowfall is February (0.47").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in September
Altheimer, AR

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

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

Average daylight in September / Average sunshine in September - Altheimer, AR
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in September
Altheimer, AR

Average sunshine days in September - Altheimer, AR
  • Average sunshine days in September: 18.2 days

The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is July (12.3 days).

Average UV index in September
Altheimer, AR

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

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in September
Altheimer, AR

Average cloud cover in September - Altheimer, AR
  • Average cloud cover in September: 27

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 25).

Average visibility in September
Altheimer, AR

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

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

Altheimer, Arkansas, USA

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