Dallas
Texas, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Dallas, TX

Dallas, Texas, modern city skyscrapers viewed from above, just before sunset
Dallas, Texas, modern city skyscrapers viewed from above, just before sunset
September remains hot throughout but experiences a slight drop in the temperature to the range of 69.1°F (20.6°C) and 88.7°F (31.5°C). The summer scorch is still on and outdoors remains uncomfortable, but Dallas evenings are cool and lovely, and more crowds are experienced more during the evenings.
Rainfall in September usually comes in the afternoons, for approximately five days and collects 2.8" (71.1mm) in precipitation. A light dressing is advised, as is using the shades since the UV index is still high.

What is the temperature in September in Dallas?

In Dallas, Texas, in September, the average high-temperature is 88.7°F (31.5°C), and the average low-temperature is 69.1°F (20.6°C).

What is the average humidity in September in Dallas?

In Dallas, the average relative humidity in September is 66.5%.

How many days does it rain in September in Dallas?

In Dallas, Texas, during September, the rain falls for 5.3 days and regularly aggregates up to 2.8" (72.1mm) of precipitation.

How many hours of daylight does Dallas have in September?

In September, the average length of the day in Dallas is 12.4h.

How many hours of sunshine does Dallas have in September?

In September, the average sunshine in Dallas is 8.2h.

How high is the UV index in September in Dallas?

The average daily maximum UV index in September in Dallas is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Dallas, TX
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is August (96.4°F).
The month with the lowest average high temperature is January (56.8°F).

  • Average low temperature in September: 69°F

The month with the highest average low temperature is August (76.8°F).
The coldest month (with the lowest average low temperature) is January (37.3°F).

Average humidity in September - Dallas, TX
  • Average humidity in September: 66.5%

The month with the highest relative humidity is May (69.7%).
The month with the lowest relative humidity is August (59.5%).

Average rainfall in September - Dallas, TX
  • Average rainfall in September: 2.8"

The wettest month (with the highest rainfall) is May (4.9").
The driest month (with the lowest rainfall) is August (1.9").

Average rainfall days in September - Dallas, TX
  • Average rainfall days in September: 5.3 days

The month with the highest number of rainy days is May (9.7 days).
The month with the lowest number of rainy days is August (4.6 days).

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

The month with the highest snowfall is February (0.6").
Months with the lowest snowfall are April, May, June, July, August, September, October and November (0").

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

The month with the highest number of snowfall days is January (0.5 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Dallas, TX
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 8.2h

The month with most sunshine is July (Average sunshine: 10.7h).
The month with least sunshine is December (Average sunshine: 5.6h).

Average UV index in September - Dallas, TX
  • Average UV index in September: 8

Months with the highest UV index are May, June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).