September weather forecast
Dallas, TX

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Dallas, Texas, modern city skyscrapers, just before sunset
Dallas, Texas, modern city skyscrapers, just before sunset

Weather in September

The shift into September replaces Dallas's hot summer with the early stages of autumn, characterized by cooler temperatures, increased rainfall, and shorter daylight hours. The transition from August manifests in a noticeable drop in temperature and a minimal decrease in wind speed. The slight increase in rainfall from August's 2.6" (66mm) indicates the onset of the region's wet season. A gradual rise in cloud cover commences, adding to the charm of the upcoming weather transition. This month is ideal for travelers preferring mild outdoor activities, with conditions being favourable for leisurely exploring the city's diverse offerings.

Temperature

September's onset in Dallas brings a negligible change in high-temperatures, falling from a very hot 96.1°F (35.6°C) in August to a hot 87.8°F (31°C). Dallas, during September nights, observes an average temperature of 70.5°F (21.4°C).

Heat index

Throughout September, the heat index is computed to be a fiery hot 95°F (35°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. 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. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In Dallas, the average relative humidity in September is 62%.

Rainfall

In Dallas, in September, during 14.1 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. In Dallas, during the entire year, the rain falls for 141.2 days and collects up to 30.12" (765mm) of precipitation.

Snowfall

March through October are months without snowfall in Dallas.

Daylight

In September, the average length of the day in Dallas is 12h and 22min.
On the first day of September, sunrise is at 7:02 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:12 pm CDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

In Dallas, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the UV index of 6 transforms into the following advice:
Shun overexposure. Protection from sun ravages is indispensable. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
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Frequently asked questions

How hot is it in Dallas in September?

In September, in Dallas, the average high-temperature is 87.8°F (31°C), and the average low-temperature is 70.5°F (21.4°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 95°F (35°C).

What is the average humidity in September in Dallas?

In September, the average relative humidity is 62%.

How much does it rain in Dallas in September?

In Dallas, in September, during 14.1 rainfall days, 2.32" (59mm) of precipitation is typically accumulated.

When it does not snow in Dallas?

In Dallas, Texas, snow does not fall in March through October.

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

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

When is the sunrise / sunset in September in Dallas?

In September, on the first day of the month, sunrise is at 7:02 am and sunset at 7:51 pm. On the last day of the month, in Dallas, sunrise is at 7:21 am and sunset at 7:12 pm CDT.

How many hours of sunshine does Dallas have in September?

In Dallas, the average sunshine duration in September is 8.6h.

How high is the UV index in September in Dallas?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk 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
Dallas, TX

Average temperature in September - Dallas, TX
  • Average high temperature in September: 87.8°F

The warmest month (with the highest average high temperature) is August (96.1°F).
The month with the lowest average high temperature is January (54.3°F).

  • Average low temperature in September: 70.5°F

The month with the highest average low temperature is August (77.2°F).
The coldest month (with the lowest average low temperature) is January (39.2°F).

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Average pressure in September
Dallas, TX

Average pressure in September - Dallas, TX
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Dallas, TX

Average wind speed in September - Dallas, TX
  • Average wind speed in September: 6.6mph

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is September (6.6mph).

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Average humidity in September
Dallas, TX

Average humidity in September - Dallas, TX
  • Average humidity in September: 62%

The month with the highest relative humidity is May (72%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Dallas, TX

Average rainfall in September - Dallas, TX
  • Average rainfall in September: 2.32"

The wettest month (with the highest rainfall) is May (4.13").
The driest month (with the least rainfall) is February (1.61").

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Average rainfall days in September
Dallas, TX

Average rainfall days in September - Dallas, TX
  • Average rainfall days in September: 14.1 days

The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (6.7 days).

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Average snowfall in September
Dallas, TX

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

The month with the highest snowfall is February (0.43").
The months with the least snowfall are March, April, May, June, July, August, September and October (0").

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Average snowfall days in September
Dallas, TX

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

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Dallas, TX
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days in September
Dallas, TX

Average sunshine days in September - Dallas, TX
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is May (12.2 days).

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Average UV index in September
Dallas, TX

Average UV index in September - Dallas, TX
  • Average UV index in September: 6

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

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Average cloud cover in September
Dallas, TX

Average cloud cover in September - Dallas, TX
  • Average cloud cover in September: 28

The months with the most cloud cover are February and March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).

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Average visibility in September
Dallas, TX

Average visibility in September - Dallas, TX
  • 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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Dallas, Texas, USA

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