September weather forecast
Dallas, SD

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Weather in September

September, the first month of the autumn in Dallas, is also a moderately hot month, with an average temperature ranging between min 56.3°F (13.5°C) and max 76.6°F (24.8°C).

Temperature

The average high-temperature drops in September, from August's 85.8°F (29.9°C) to a still moderately hot 76.6°F (24.8°C). An average low-temperature of 56.3°F (13.5°C) is recorded during the nights in September.

Humidity

August and September, with an average relative humidity of 57%, are the least humid months in Dallas.

Rainfall

In September, in Dallas, South Dakota, the rain falls for 9.5 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. Throughout the year, there are 103.9 rainfall days, and 16.85" (428mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Dallas.

Daylight

In Dallas, the average length of the day in September is 12h and 29min.
On the first day of September in Dallas, sunrise is at 7:03 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:20 pm CDT.

Sunshine

In September, the average sunshine is 9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Updated: Feb 14, 2024 | Published by: Weather U.S. | About Us

Frequently asked questions

What are the temperatures in Dallas in September?

An average high-temperature, in September, in Dallas, is 76.6°F (24.8°C) and the average low-temperature is 56.3°F (13.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 89.6°F (32°C).

What is the least humid month in Dallas?

August and September, with an average relative humidity of 57%, are the least humid months in Dallas, South Dakota.

What is the average humidity in September in Dallas?

The average relative humidity in September in Dallas is 57%.

How much does it rain in Dallas in September?

In Dallas, South Dakota, in September, it is raining for 9.5 days, with typically 1.34" (34mm) of accumulated precipitation.

When it does not snow in Dallas?

June through September are months without snowfall in Dallas.

Does it snow in Dallas in September?

In Dallas, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Dallas have in September?

In September, the average day length in Dallas is 12h and 29min.

When is the sunrise / sunset in September in Dallas?

On the first day of September in Dallas, sunrise is at 7:03 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:20 pm CDT.

How many hours of sunshine does Dallas have in September?

In Dallas, South Dakota, the average sunshine duration in September is 9h.

What is the UV index intensity in September in Dallas?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's 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
Dallas, SD

Average temperature in September - Dallas, SD
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

Average pressure in September
Dallas, SD

Average pressure in September - Dallas, SD
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed in September
Dallas, SD

Average wind speed in September - Dallas, SD
  • Average wind speed in September: 10.7mph

The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9.8mph).

Average humidity in September
Dallas, SD

Average humidity in September - Dallas, SD
  • Average humidity in September: 57%

The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are August and September (57%).

Average rainfall in September
Dallas, SD

Average rainfall in September - Dallas, SD
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in September
Dallas, SD

Average rainfall days in September - Dallas, SD
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is June (15.3 days).
The months with the least rainy days are January and February (2.7 days).

Average snowfall in September
Dallas, SD

Average snowfall in September - Dallas, SD
  • Average snowfall in September: 0"

The month with the highest snowfall is December (3.19").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Dallas, SD

Average snowfall days in September - Dallas, SD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Dallas, SD

Average daylight in September / Average sunshine in September - Dallas, SD
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in September
Dallas, SD

Average sunshine days in September - Dallas, SD
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in September
Dallas, SD

Average UV index in September - Dallas, SD
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Dallas, SD

Average cloud cover in September - Dallas, SD
  • Average cloud cover in September: 22

The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 20).

Average visibility in September
Dallas, SD

Average visibility in September - Dallas, SD
  • 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).

Dallas, South Dakota, USA

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