Monthly climate guide
Dallas weather in September
With highs near 33°C (91°F) and lows around 21°C (70°F), September feels very hot in Dallas. Rainfall averages about 66 mm (some rain) and the sky is a mix of sun and cloud. Daytime highs are 4°C cooler than August and 7°C warmer than October.
What stands out in September
- In Dallas, September is early autumn.
- Skies are at their clearest this time of year.
- It cools down fast from here: October is about 7°C cooler.
- Just 310 km apart, but Dallas runs about 3°C warmer than Oklahoma City this month.
Avg high
33°C
91°F
Avg low
21°C
70°F
Rainfall
66 mm
some rain
Humidity
61%
relative
Sky
38%
cloud · a mix of sun and cloud
Dallas weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 13°C / 55°F | 1°C / 34°F | 59 mm | 73% | 49% |
| February | 15°C / 60°F | 3°C / 38°F | 66 mm | 75% | 58% |
| March | 21°C / 69°F | 8°C / 47°F | 75 mm | 73% | 55% |
| April | 25°C / 76°F | 12°C / 54°F | 91 mm | 72% | 53% |
| May | 29°C / 83°F | 17°C / 63°F | 139 mm | 72% | 54% |
| June | 33°C / 92°F | 22°C / 72°F | 96 mm | 69% | 42% |
| July | 36°C / 97°F | 24°C / 76°F | 47 mm | 60% | 41% |
| August | 37°C / 98°F | 25°C / 76°F | 63 mm | 57% | 38% |
| September | 33°C / 91°F | 21°C / 70°F | 66 mm | 61% | 38% |
| October | 26°C / 80°F | 14°C / 57°F | 107 mm | 66% | 38% |
| November | 19°C / 67°F | 7°C / 45°F | 62 mm | 71% | 46% |
| December | 14°C / 57°F | 3°C / 37°F | 70 mm | 74% | 57% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
- Sunglasses
Is September a good time to visit Dallas?
Compare the months in the chart above to find your ideal window.
Best time to visit Dallas →Other United States cities in September
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Dallas weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/dallas/september
<a href="https://weathercompare.eu/weather/usa/dallas/september">Dallas weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/dallas" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Dallas weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/dallas/september">Dallas weather in September</a> – WeatherCompare</p>
Dallas in September: quick answers
Is September a good time to visit Dallas?
It can be, if you like heat: September highs in Dallas are around 33°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is Dallas in September?
Average highs are about 33°C (91°F) and average lows about 21°C (70°F), based on 10 years of daily data.
Does it rain a lot in Dallas in September?
Dallas typically gets around 66 mm of rain in September — some rain.
Figures are long-term averages for the area around Dallas (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.