September weather forecast
Donaldson, AR

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Donaldson, Arkansas, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 85.5°F (29.7°C).

Temperature

With the commencement of September, Donaldson records a moderate temperature decline, with the average high easing from August's tropical 91.4°F (33°C) to a warm 85.5°F (29.7°C). During the nights in September, Donaldson experiences a consistent average temperature of 64.8°F (18.2°C).

Heat index

In September, the heat index is evaluated at a fiery hot 95°F (35°C). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

July, September and October, with an average relative humidity of 72%, are the least humid months in Donaldson.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.4 days and typically collects 2.24" (57mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:45 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:56 pm CDT.

Sunshine

In Donaldson, the average sunshine in September is 9.5h.

UV index

In Donaldson, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 6 in September, converts into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot during September?

The high-temperature, in September, in Donaldson, is 85.5°F (29.7°C), while the low-temperature averages to 64.8°F (18.2°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is evaluated at 95°F (35°C).

What are the least humid months in Donaldson?

July, September and October, with an average relative humidity of 72%, are the least humid months.

What is the average humidity in September?

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

What is the driest month?

September is the month with the least rainfall. Rain falls for 13.4 days and accumulates 2.24" (57mm) of precipitation.

How many days does it rain in September?

In Donaldson, in September, it is raining for 13.4 days, with typically 2.24" (57mm) of accumulated precipitation.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Donaldson have in September?

In September, the average day length is 12h and 22min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:45 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:56 pm CDT.

How many hours of sunshine does Donaldson have in September?

In September, the average sunshine duration is 9.5h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health threat 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
Donaldson, AR

Average temperature in September - Donaldson, AR
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is July (92.1°F).
The month with the lowest average high temperature is January (49.6°F).

  • Average low temperature in September: 64.8°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).

Average pressure in September
Donaldson, AR

Average pressure in September - Donaldson, 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
Donaldson, AR

Average wind speed in September - Donaldson, AR
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in September
Donaldson, AR

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

The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are July, September and October (72%).

Average rainfall in September
Donaldson, AR

Average rainfall in September - Donaldson, AR
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is April (4.53").
The driest month (with the least rainfall) is September (2.24").

Average rainfall days in September
Donaldson, AR

Average rainfall days in September - Donaldson, AR
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is August (18.3 days).
The month with the least rainy days is November (10.2 days).

Average snowfall in September
Donaldson, AR

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

The month with the highest snowfall is February (0.91").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Donaldson, AR

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

The month with the highest number of snowfall days is February (1.8 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
Donaldson, AR

Average daylight in September / Average sunshine in September - Donaldson, 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 3min

The months with the most sunshine are June, July and August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).

Average sunshine days in September
Donaldson, AR

Average sunshine days in September - Donaldson, AR
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is January (18.6 days).
The month with the least sunshine days is August (10 days).

Average UV index in September
Donaldson, AR

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

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
Donaldson, AR

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

The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June and September (Cloud cover 28).

Average visibility in September
Donaldson, AR

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

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

Donaldson, Arkansas, USA

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