Dallas weather in September: Dallas, Texas: normal highs, lows, rain and records for September
Dallas in September has a normal high of 89°F and a normal low of 69°F, a daily mean of 79°F, falling from 93°F on the 1st to 84°F by the 30th. Measurable precipitation falls on 5 days in a normal September, 2.72 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 20°C, 69 mm of precipitation in September.
- NOAA stationDallas Fort Worth Airport
- Station IDUSW00003927
- Location32.90°N 97.02°W
- Elevation560 ft (171 m)
- From the center16 miles
- Population1,326,087
- Jan 57° 36°
- Feb 61° 40°
- Mar 69° 48°
- Apr 76° 55°
- May 84° 65°
- Jun 92° 72°
- Jul 96° 76°
- Aug 96° 76°
- Sep 89° 69°
- Oct 78° 57°
- Nov 67° 46°
- Dec 58° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Dallas in September?
The normal high is 89°F and the normal low 69°F, for a daily mean of 78.5°F. September is 7.2°F cooler than August and 10.8°F warmer than October. September is the 4th warmest month of the year in Dallas and the 8th wettest. Across the month the normal high falls 9°F, from 93°F on September 1 to 84°F on September 30. From one year to the next September's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 76°F and 82°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 19%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 93°F | 73°F | 19% | 13% |
| September 8 | 91°F | 71°F | 18% | 13% |
| September 15 | 89°F | 69°F | 18% | 12% |
| September 22 | 87°F | 66°F | 17% | 12% |
| September 30 | 84°F | 63°F | 18% | 13% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 93°F | 73°F | 19% | 13% | 12 h 50 min |
| September 2 | 92°F | 73°F | 19% | 13% | 12 h 50 min |
| September 3 | 92°F | 73°F | 19% | 13% | 12 h 50 min |
| September 4 | 92°F | 72°F | 19% | 13% | 12 h 50 min |
| September 5 | 92°F | 72°F | 18% | 13% | 12 h 50 min |
| September 6 | 91°F | 72°F | 18% | 13% | 12 h 40 min |
| September 7 | 91°F | 71°F | 18% | 13% | 12 h 40 min |
| September 8 | 91°F | 71°F | 18% | 13% | 12 h 40 min |
| September 9 | 91°F | 71°F | 18% | 13% | 12 h 40 min |
| September 10 | 90°F | 71°F | 18% | 12% | 12 h 40 min |
| September 11 | 90°F | 70°F | 18% | 12% | 12 h 30 min |
| September 12 | 90°F | 70°F | 18% | 12% | 12 h 30 min |
| September 13 | 89°F | 70°F | 18% | 12% | 12 h 30 min |
| September 14 | 89°F | 69°F | 18% | 12% | 12 h 30 min |
| September 15 | 89°F | 69°F | 18% | 12% | 12 h 30 min |
| September 16 | 89°F | 69°F | 18% | 12% | 12 h 20 min |
| September 17 | 88°F | 68°F | 18% | 12% | 12 h 20 min |
| September 18 | 88°F | 68°F | 18% | 12% | 12 h 20 min |
| September 19 | 88°F | 67°F | 17% | 12% | 12 h 20 min |
| September 20 | 87°F | 67°F | 17% | 12% | 12 h 20 min |
| September 21 | 87°F | 67°F | 17% | 12% | 12 h 10 min |
| September 22 | 87°F | 66°F | 17% | 12% | 12 h 10 min |
| September 23 | 87°F | 66°F | 17% | 12% | 12 h 10 min |
| September 24 | 86°F | 66°F | 17% | 12% | 12 h 10 min |
| September 25 | 86°F | 65°F | 17% | 12% | 12 h 10 min |
| September 26 | 86°F | 65°F | 17% | 12% | 12 h |
| September 27 | 85°F | 65°F | 17% | 13% | 12 h |
| September 28 | 85°F | 64°F | 18% | 13% | 12 h |
| September 29 | 85°F | 64°F | 18% | 13% | 12 h |
| September 30 | 84°F | 63°F | 18% | 13% | 12 h |
- Normal high
- 89°FSeptember average
- Normal low
- 69°FSeptember average
- Precipitation
- 2.72 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 16
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 27
- Sunshine
- 84%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003927; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Dallas in September?
On a given September day the chance of 0.01 inch or more is 18% on average, highest around September 1 (19%). In all, 2.72 in falls on 5 days of a normal September, 1 of them with an inch or more.
In a normal September in Dallas, 16 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003927.
How humid and windy is Dallas in September?
At 3 p.m. the normal temperature is 84°F with 39% relative humidity and a dew point of 56°F; at 6 a.m. it is 66°F with 79% humidity. The wind averages 8.9 mph, most often from the southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 66°F | 59°F | 79% | 7.1 mph | 55% |
| 9 a.m. | 73°F | 60°F | 64% | 9.5 mph | 45% |
| noon | 81°F | 58°F | 47% | 10.4 mph | 44% |
| 3 p.m. | 84°F | 56°F | 39% | 10.8 mph | 44% |
| 6 p.m. | 80°F | 56°F | 44% | 9.6 mph | 58% |
| 9 p.m. | 73°F | 57°F | 57% | 8.5 mph | 63% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00003927. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Dallas?
The warmest September temperature on Dallas's official record (since 1913) is 110°F, on September 4, 2000; the coldest is 36°F, on September 27, 1942. The wettest September brought 12.40 in (2018).
The September mean against the 1991-2020 normal of 78.5°F: 2021 80.5°F (+2.0), 2022 80.5°F (+2.0), 2023 84.6°F (+6.1), 2024 79.3°F (+0.8), 2025 80.8°F (+2.3), 2026 87.9°F (+9.4). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 80.5°F | +2.0°F | 0.25 in |
| 2022 | 80.5°F | +2.0°F | 0.33 in |
| 2023 | 84.6°F | +6.1°F | 0.83 in |
| 2024 | 79.3°F | +0.8°F | 2.24 in |
| 2025 | 80.8°F | +2.3°F | 1.11 in |
| 2026 | 87.9°F | +9.4°F | 0.17 in |
Source: records: ACIS, NWS threaded record DALthr; recent months: ACIS, station USW00003927. Records and recent months use complete months only.
How does September in Dallas compare across Texas?
Across the 321 places PlainClimate covers in Texas, September normal highs run from 81°F in Hart to 95°F in Presidio; Dallas's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.