New Braunfels weather in September

In September, New Braunfels sees average daytime highs of 89°F and overnight lows near 70°F, with 2.9 in of rain across 8.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 92°F in the first days to 86°F by the end. The sky is clear or mostly clear about 50% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is New Braunfels's 3rd-clearest and 12th-windiest month. For the whole year in context, see New Braunfels's year-round climate.

Daytime high
89°
4th warmest
Overnight low
70°
9th coldest
Rainfall
2.9 in
8.4 wet days
Daylight
12 h 12 min
6:22 AM – 6:32 PM
Cloud cover
46%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.16 kWh/m²
Travel score
4.4
out of 10

New Braunfels is city in Comal and Guadalupe counties in Texas, United States, that is the seat of Comal County.

Density
600/km²
people per km²
Founded
1845

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 92°F in the first days to 86°F by the end.

A typical September day in New Braunfels reaches about 89°F in the afternoon and slips back to 70°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 96°F. Set against its neighbours, September runs about 6°F cooler than August and about 8°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19273
29273
39273
49273
59173
69173
79172
89172
99072
109072
119071
129071
138971
148971
158970
168970
178970
188870
198869
208869
218869
228868
238768
248767
258767
268767
278767
288666
298666
308666

How September really feels in New Braunfels

Once humidity and wind are folded in, September averages 20 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
20
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

New Braunfels 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 daysDaylight (hours)Travel score
Jan62° / 43°2.57.310.35.7
Feb66° / 46°2.47.410.96.3
Mar72° / 53°3.09.211.86.9
Apr79° / 59°3.18.512.76.9
May85° / 67°4.311.213.55.1
Jun91° / 73°2.91013.93.7
Jul94° / 74°1.86.513.73.0
Aug95° / 75°2.26.113.12.8
Sep89° / 70°2.98.412.24.4
Oct81° / 61°3.27.811.36.9
Nov71° / 51°2.77.410.57.1
Dec63° / 44°2.77.910.16.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16535
26535
36535
46436
56436
66337
76337
86238
96238
106238
116139
126238
136238
146337
156337
166436
176436
186535
196634
206634
216733
226931
237030
247129
257327
267426
277525
287525
297426
307426

Chance of precipitation in September

Any precipitation

New Braunfels gets around 2.9 in of rain over 8.4 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 28% and peaks near 32% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
127
227
328
429
529
630
730
831
931
1032
1132
1232
1332
1432
1532
1631
1731
1830
1929
2028
2127
2226
2325
2424
2523
2623
2722
2821
2921
3021

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1251137451
2261136441
3361136441
4361136431
5361136431
6461136431
7461135431
8561135431
9561134431
10571134431
11671133431
12671132431
13681132430
14781131430
15781230420
16791230420
17891329410
189101328390
1910101427380
2011111526370
2113111526350
2214111625340
2316111724320
2417111724300
2519121823290
2620121823270
2721111923250
2823111923240
2924112023230
3025112023220

Wind in September

Winds average 6 mph in September, the calmest month.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over September. Sunrise moves from 6:13 AM to 6:29 AM, and sunset from 6:51 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:136:51
212.66:146:50
312.66:146:49
412.56:156:47
512.56:166:46
612.56:166:45
712.46:176:44
812.46:176:42
912.46:186:41
1012.46:186:40
1112.36:196:39
1212.36:196:37
1312.36:206:36
1412.26:206:35
1512.26:216:33
1612.26:226:32
1712.16:226:31
1812.16:236:30
1912.16:236:28
2012.16:246:27
2112.06:246:26
2212.06:256:24
2312.06:256:23
2411.96:266:22
2511.96:276:21
2611.96:276:19
2711.86:286:18
2811.86:286:17
2911.86:296:15
3011.76:296:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.16 kWh/m².

For context, solar energy here swings from a low near 2.68 kWh/m² to a high of 6.67 kWh/m² in July across the year — September's 5.16 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.5Bright
45.5Bright
55.4Bright
65.4Bright
75.3Bright
85.3Bright
95.3Bright
105.2Bright
115.2Bright
125.2Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
Planning a trip in September

Is September a good time to visit New Braunfels?

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

4.4
Sightseeing
9th-best month of the year
6.9
Beach & pool
2nd-best month of the year

September is a reasonable time to visit New Braunfels for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for New Braunfels in September

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

In September, New Braunfels sees daytime highs around 89°F and nights near 70°F. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in New Braunfels in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in New Braunfels peaks around August 10 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateAug 10UV 11Dec 20UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov5High
Dec4Moderate

Air quality in New Braunfels in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in New Braunfels is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (December, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1416 µg/m³Dec 136 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar8Good
Apr9Good
May14Moderate
Jun14Moderate
Jul17Moderate
Aug12Good
Sep10Good
Oct6Good
Nov6Good
Dec6Good
Location & terrain

Where is New Braunfels?

New Braunfels sits at 29.7°N, 98.1°W, 630 ft above sea level, in United States. The nearest listed city is Cibolo, 12 mi away.

Topography around New Braunfels

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

Within 2 miles, the terrain around New Braunfels has only modest variations in elevation — a maximum elevation change of 315 ft around an average of 669 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 781 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,831 ft.

The land around New Braunfels is covered by artificial surfaces (42%) and trees (40%) within 2 miles, trees (42%) and grassland (30%) within 10 miles, and trees (47%) and grassland (42%) within 50 miles.

2 miles
315 ft
10 miles
781 ft
50 miles
1,831 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Cibolo 12 mi · Seguin 13 mi · Schertz 14 mi · Canyon Lake 14 mi · Universal City 15 mi · Live Oak 16 mi · San Marcos 17 mi · Converse 17 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 New Braunfels (29.703°, -98.1244°, elevation 630 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).