Dallas weather in September
Long-run climate averages for Dallas, TX in September, plus what the forecast models say for the days ahead.
In September, Dallas averages 91°F by day and 72°F at night. The wettest month is usually May.
September in Dallas averages a daytime high of 91°F and an overnight low of 72°F, which reads as hot for this part of the world. Across the whole year Dallas sees roughly 54 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like - for that, see the live Dallas forecast with every model compared and how much they currently agree.
Dallas weather by month
what to expect in Dallas through the yearHere is Dallas's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Dallas by season.
Bottom line: over the last 30 days the European model has been the most accurate forecast for Dallas, scoring 95/100 on our CheckWeather Score, ahead of the American at 90. See the full US accuracy scoreboard for exactly how every model is tested.
Common questions
How warm is Dallas in September?
Is September a good time to visit Dallas?
Does it rain a lot in Dallas in September?
Climate averages from ERA5 reanalysis. Model accuracy re-scored over a rolling 30 days. Page updated .