September weather forecast
Donaldsonville, AR

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Donaldsonville, Arkansas, with an average temperature fluctuating between 66.2°F (19°C) and 85.8°F (29.9°C).

Temperature

September notes an average high-temperature of a warm 85.8°F (29.9°C), subtly differing from August's 90.7°F (32.6°C). During September, the nighttime temperature in Donaldsonville averages of 66.2°F (19°C).

Heat index

For September, the heat index is calculated to be a fiery hot 95°F (35°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The average relative humidity in September is 71%.

Rainfall

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

Snowfall

March through December are months without snowfall.

Daylight

In Donaldsonville, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:42 am and sunset at 7:34 pm. On the last day of September, in Donaldsonville, sunrise is at 7:02 am and sunset at 6:53 pm CDT.

Sunshine

The average sunshine in September in Donaldsonville is 9.7h.

UV index

In Donaldsonville, Arkansas, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index, 6 during September, leads to the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.
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Frequently asked questions

How hot is it in Donaldsonville in September?

In Donaldsonville, 85.8°F (29.9°C) is the average high-temperature and 66.2°F (19°C) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is calculated to be 95°F (35°C).

What is the average humidity in September in Donaldsonville?

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

How much does it rain in Donaldsonville in September?

In Donaldsonville, during September, the rain falls for 9.8 days and regularly aggregates up to 1.22" (31mm) of precipitation.

When it does not snow in Donaldsonville?

In Donaldsonville, snow does not fall in March through December.

What is the average length of the day in September in Donaldsonville?

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

When is the sunrise / sunset in September in Donaldsonville?

In September, on the first day of the month, sunrise is at 6:42 am and sunset at 7:34 pm. On the last day of the month, in Donaldsonville, sunrise is at 7:02 am and sunset at 6:53 pm CDT.

How long on average sun shines in September in Donaldsonville?

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

How high is the UV index in September in Donaldsonville?

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
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
Donaldsonville, AR

Average temperature in September - Donaldsonville, 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).

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Average pressure in September
Donaldsonville, AR

Average pressure in September - Donaldsonville, 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).

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Average wind speed in September
Donaldsonville, AR

Average wind speed in September - Donaldsonville, 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).

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Average humidity in September
Donaldsonville, AR

Average humidity in September - Donaldsonville, 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%).

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Average rainfall in September
Donaldsonville, AR

Average rainfall in September - Donaldsonville, 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").

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Average rainfall days in September
Donaldsonville, AR

Average rainfall days in September - Donaldsonville, 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).

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Average snowfall in September
Donaldsonville, AR

Average snowfall in September - Donaldsonville, 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").

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Average snowfall days in September
Donaldsonville, AR

Average snowfall days in September - Donaldsonville, 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).

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

Average daylight in September / Average sunshine in September - Donaldsonville, 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).

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Average sunshine days in September
Donaldsonville, AR

Average sunshine days in September - Donaldsonville, 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).

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Average UV index in September
Donaldsonville, AR

Average UV index in September - Donaldsonville, 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).

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Average cloud cover in September
Donaldsonville, AR

Average cloud cover in September - Donaldsonville, 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).

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Average visibility in September
Donaldsonville, AR

Average visibility in September - Donaldsonville, 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).

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Donaldsonville, Arkansas, USA

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