Austin weather in September: Austin, Texas: normal highs, lows, rain and records for September
Austin in September has a normal high of 91°F and a normal low of 70°F, a daily mean of 81°F, falling from 95°F on the 1st to 88°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 3.45 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 21°C, 88 mm of precipitation in September.
- NOAA stationAustin-Camp Mabry
- Station IDUSW00013958
- Location30.32°N 97.76°W
- Elevation670 ft (204 m)
- From the center2 miles
- Population993,588
- Jan 63° 42°
- Feb 67° 46°
- Mar 73° 52°
- Apr 80° 59°
- May 87° 67°
- Jun 93° 73°
- Jul 97° 75°
- Aug 98° 75°
- Sep 91° 70°
- Oct 83° 61°
- Nov 72° 51°
- Dec 64° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Austin in September?
The normal high is 91°F and the normal low 70°F, for a daily mean of 80.8°F. September is 5.7°F cooler than August and 9.2°F warmer than October. September is the 4th warmest month of the year in Austin and the 4th wettest. Across the month the normal high falls 7°F, from 95°F on September 1 to 88°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 78°F and 83°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 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 95°F | 73°F | 22% | 14% |
| September 8 | 93°F | 72°F | 23% | 14% |
| September 15 | 92°F | 70°F | 23% | 14% |
| September 22 | 90°F | 69°F | 22% | 14% |
| September 30 | 88°F | 66°F | 21% | 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 | 95°F | 73°F | 22% | 14% | 12 h 50 min |
| September 2 | 95°F | 73°F | 22% | 14% | 12 h 50 min |
| September 3 | 95°F | 73°F | 23% | 14% | 12 h 40 min |
| September 4 | 94°F | 73°F | 23% | 14% | 12 h 40 min |
| September 5 | 94°F | 73°F | 23% | 14% | 12 h 40 min |
| September 6 | 94°F | 73°F | 23% | 14% | 12 h 40 min |
| September 7 | 94°F | 72°F | 23% | 14% | 12 h 40 min |
| September 8 | 93°F | 72°F | 23% | 14% | 12 h 40 min |
| September 9 | 93°F | 72°F | 23% | 14% | 12 h 30 min |
| September 10 | 93°F | 72°F | 23% | 14% | 12 h 30 min |
| September 11 | 93°F | 71°F | 23% | 14% | 12 h 30 min |
| September 12 | 92°F | 71°F | 23% | 14% | 12 h 30 min |
| September 13 | 92°F | 71°F | 23% | 14% | 12 h 30 min |
| September 14 | 92°F | 71°F | 23% | 14% | 12 h 30 min |
| September 15 | 92°F | 70°F | 23% | 14% | 12 h 20 min |
| September 16 | 91°F | 70°F | 23% | 14% | 12 h 20 min |
| September 17 | 91°F | 70°F | 23% | 14% | 12 h 20 min |
| September 18 | 91°F | 70°F | 23% | 14% | 12 h 20 min |
| September 19 | 91°F | 69°F | 23% | 14% | 12 h 20 min |
| September 20 | 90°F | 69°F | 23% | 14% | 12 h 10 min |
| September 21 | 90°F | 69°F | 22% | 14% | 12 h 10 min |
| September 22 | 90°F | 69°F | 22% | 14% | 12 h 10 min |
| September 23 | 90°F | 68°F | 22% | 14% | 12 h 10 min |
| September 24 | 89°F | 68°F | 22% | 14% | 12 h 10 min |
| September 25 | 89°F | 68°F | 22% | 14% | 12 h 10 min |
| September 26 | 89°F | 67°F | 22% | 13% | 12 h |
| September 27 | 89°F | 67°F | 22% | 13% | 12 h |
| September 28 | 88°F | 67°F | 21% | 13% | 12 h |
| September 29 | 88°F | 67°F | 21% | 13% | 12 h |
| September 30 | 88°F | 66°F | 21% | 13% | 12 h |
- Normal high
- 91°FSeptember average
- Normal low
- 70°FSeptember average
- Precipitation
- 3.45 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 20
- 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
- 28
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013958; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Austin in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 10 (23%). In all, 3.45 in falls on 7 days of a normal September, 1 of them with an inch or more.
In a normal September in Austin, 20 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013958.
What are the records for September in Austin?
The warmest September temperature on Austin's official record (since 1897) is 112°F, on September 5, 2000; the coldest is 41°F, on September 27, 1942. The wettest September brought 20.78 in (1921).
The September mean against the 1991-2020 normal of 80.8°F: 2021 82.9°F (+2.1), 2022 82.7°F (+1.9), 2023 85.9°F (+5.1), 2024 83.1°F (+2.3), 2025 82.7°F (+1.9), 2026 88.2°F (+7.4). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 82.9°F | +2.1°F | 1.79 in |
| 2022 | 82.7°F | +1.9°F | 0.47 in |
| 2023 | 85.9°F | +5.1°F | 1.58 in |
| 2024 | 83.1°F | +2.3°F | 0.37 in |
| 2025 | 82.7°F | +1.9°F | 0.08 in |
| 2026 | 88.2°F | +7.4°F | 0.47 in |
Source: records: ACIS, NWS threaded record ATTthr; recent months: ACIS, station USW00013958. Records and recent months use complete months only.
How does September in Austin 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; Austin's is 91°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.