Austin weather in September

In September, Austin sees average daytime highs of 71°F and overnight lows near 52°F, with 3.5 in of rain across 8.9 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 76°F in the first days to 66°F by the end. The sky is clear or mostly clear about 42% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Austin's 1st-clearest and 9th-windiest month. For the whole year in context, see Austin's year-round climate.

Daytime high
71°
4th warmest
Overnight low
52°
9th coldest
Rainfall
3.5 in
8.9 wet days
Daylight
12 h 18 min
5:57 AM – 6:15 PM
Cloud cover
49%
1st clearest
Wind
10 mph
9th windiest
Solar energy
4.34 kWh/m²
Travel score
6.9
out of 10

Austin is city in, and the county seat of, Mower County, Minnesota, United States.

Density
797/km²
people per km²
Founded
1853

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 76°F in the first days to 66°F by the end.

A typical September day in Austin reaches about 71°F in the afternoon and slips back to 52°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 60°F and 82°F. Set against its neighbours, September runs about 6°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17657
27657
37656
47556
57556
67555
77455
87455
97454
107354
117354
127353
137253
147253
157152
167152
177151
187051
197051
206950
216950
226949
236849
246848
256748
266747
276747
286647
296646
306546

How September really feels in Austin

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Austin weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan23° / 1.16.46.29.10.0
Feb27° / 12°1.25.65.310.20.0
Mar40° / 24°2.38.44.311.60.5
Apr56° / 37°3.811.62.213.23.5
May68° / 49°4.813.30.114.55.7
Jun77° / 59°5.312.2015.26.4
Jul80° / 62°4.29.8014.96.7
Aug78° / 60°3.910.1013.86.9
Sep71° / 52°3.58.9012.36.9
Oct58° / 39°2.78.80.610.84.4
Nov42° / 27°1.96.73.39.50.7
Dec28° / 15°1.47.26.48.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16436
26535
36535
46436
56436
66436
76337
86238
96139
106040
115941
125842
135743
145644
155545
165446
175347
185347
195347
205248
215347
225347
235347
245347
255347
265347
275446
285446
295446
305545

Chance of precipitation in September

Any precipitation

Austin gets around 3.5 in of rain over 8.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
529
629
729
829
930
1030
1130
1231
1331
1431
1531
1632
1732
1832
1931
2031
2131
2231
2331
2431
2531
2631
2731
2830
2930
3030

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 62% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1352320183
2372320163
3402319153
4422219143
5442218132
6462118122
7482117112
8502017112
9522017101
10541916101
1155191691
1256191591
1359181481
1460181480
1562181370
1662181370
1765171260
1865171260
1967161160
2069161050
2170151050
227314940
237414840
247713730
257713730
267912630
278111620
288211520
298310520
30859420

Wind in September

Winds average 10 mph in September.

Across September, daily wind ranges from about 9 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over September. Sunrise moves from 5:40 AM to 6:14 AM, and sunset from 6:43 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:406:43
213.05:416:41
313.05:426:40
412.95:436:38
512.95:456:36
612.85:466:34
712.85:476:32
812.75:486:30
912.75:496:28
1012.65:506:26
1112.65:526:25
1212.55:536:23
1312.45:546:21
1412.45:556:19
1512.35:566:17
1612.35:576:15
1712.25:596:13
1812.26:006:11
1912.16:016:09
2012.16:026:07
2112.06:036:06
2212.06:046:04
2311.96:066:02
2411.96:076:00
2511.86:085:58
2611.86:095:56
2711.76:105:54
2811.76:115:52
2911.66:135:50
3011.66:145:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.34 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 6.36 kWh/m² in July across the year — September's 4.34 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.6Bright
114.5Bright
124.5Bright
134.4Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.1Bright
194.1Bright
204.0Bright
214.0Bright
224.0Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Austin

In seasonPeak

In September, Austin sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Austin's rainy season runs April–October, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Austin?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.9
Sightseeing
1st-best month of the year
4.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Austin for sightseeing.

What to pack for Austin in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Austin sees daytime highs around 71°F and nights near 52°F. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Austin in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Austin peaks around June 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highVery highHighModerateLowJun 15UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May7Very high
Jun9Very high
Jul7High
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Austin?

Austin sits at 43.7°N, 93.0°W, 1,204 ft above sea level, in United States. The nearest listed city is Albert Lea, 20 mi away.

Topography around Austin

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Austin.

Within 2 miles, the terrain around Austin has only modest variations in elevation — a maximum elevation change of 105 ft around an average of 1,211 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 262 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 653 ft.

The land around Austin is covered by trees (35%), artificial surfaces (25%) and grassland (20%) within 2 miles, cropland (81%) within 10 miles, and cropland (82%) within 50 miles.

2 miles
105 ft
10 miles
262 ft
50 miles
653 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Albert Lea 20 mi · Owatonna 32 mi · Rochester 35 mi · Mason City 37 mi · Faribault 46 mi · Northfield 55 mi · Mankato 62 mi · Red Wing 66 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Austin (43.6666°, -92.9746°, elevation 1,204 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).