Del Rio weather in September

In September, Del Rio sees average daytime highs of 91°F and overnight lows near 72°F, with 2.6 in of rain across 7.5 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 94°F in the first days to 89°F by the end. The sky is clear or mostly clear about 56% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Del Rio's 3rd-clearest and 10th-windiest month. For the whole year in context, see Del Rio's year-round climate.

Daytime high
91°
4th warmest
Overnight low
72°
9th coldest
Rainfall
2.6 in
7.5 wet days
Daylight
12 h 12 min
6:33 AM – 6:43 PM
Cloud cover
41%
3rd clearest
Wind
8 mph
10th windiest
Solar energy
5.38 kWh/m²
Travel score
3.9
out of 10

Del Rio is city and the county seat of Val Verde County, Texas, United States.

Density
691/km²
people per km²

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 94°F in the first days to 89°F by the end.

A typical September day in Del Rio reaches about 91°F in the afternoon and slips back to 72°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 98°F. Set against its neighbours, September runs about 6°F cooler than August and about 8°F warmer than October.

60°70°80°90°100°151015202530
Avg high (°F)Avg low (°F)
19576
29476
39475
49475
59475
69375
79374
89374
99274
109274
119274
129273
139273
149173
159173
169172
179172
189172
199172
209171
219071
229071
239070
249070
259070
268969
278969
288969
298969
308968

How September really feels in Del Rio

Once humidity and wind are folded in, September averages 26 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
26
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.

Del Rio weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan65° / 44°0.93.510.37.1
Feb70° / 48°0.9410.97.6
Mar77° / 55°1.55.211.87.7
Apr85° / 62°1.75.112.76.2
May91° / 70°2.57.613.43.9
Jun96° / 76°1.5613.82.5
Jul97° / 78°1.65.513.72.1
Aug98° / 78°1.64.713.12.1
Sep91° / 72°2.67.512.23.9
Oct83° / 63°2.2611.36.6
Nov73° / 52°1.24.410.57.9
Dec65° / 44°0.93.810.27.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 26%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17624
27525
37525
47525
57426
67426
77426
87228
97228
107129
117129
127129
137129
147129
157129
167129
177129
187129
197228
207228
217327
227426
237525
247525
257624
267723
277723
287822
297822
307822

Chance of precipitation in September

Any precipitation

Del Rio gets around 2.6 in of rain over 7.5 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 25% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
125
226
326
427
527
628
728
829
929
1029
1128
1228
1328
1428
1527
1627
1726
1826
1925
2024
2123
2223
2322
2421
2520
2620
2719
2819
2919
3019

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 39% of days. Sticky, muggy-or-worse air turns up on roughly 61% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1362146231
2362046240
3462045250
4461945250
5461944260
6561844270
7561844270
8561843270
9661843280
10661743280
11661743280
12671743270
13771742270
14781742260
15781741260
16891841250
178101840240
189111839230
1910121838220
2011131837210
2112141836200
2213141835190
2315151834180
2416161833170
2517161832170
2618171831160
2720171930150
2821171929140
2922171929140
3023171928130

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
299light breeze
309light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over September. Sunrise moves from 6:25 AM to 6:40 AM, and sunset from 7:02 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:257:02
212.66:257:01
312.66:266:59
412.56:266:58
512.56:276:57
612.56:276:56
712.46:286:55
812.46:286:53
912.46:296:52
1012.46:306:51
1112.36:306:49
1212.36:316:48
1312.36:316:47
1412.26:326:46
1512.26:326:44
1612.26:336:43
1712.16:336:42
1812.16:346:41
1912.16:346:39
2012.16:356:38
2112.06:356:37
2212.06:366:35
2312.06:366:34
2411.96:376:33
2511.96:386:32
2611.96:386:30
2711.86:396:29
2811.86:396:28
2911.86:406:27
3011.86:406:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.38 kWh/m².

For context, solar energy here swings from a low near 3.13 kWh/m² to a high of 6.87 kWh/m² in July across the year — September's 5.38 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.1Bright
285.1Bright
295.1Bright
305.0Bright
Planning a trip in September

Is September a good time to visit Del Rio?

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

3.9
Sightseeing
8th-best month of the year
6.8
Beach & pool
4th-best month of the year

September is a weaker month for outdoor sightseeing in Del Rio. The water and warmth also suit a beach or pool day.

What to pack for Del Rio in September

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

In September, Del Rio sees daytime highs around 91°F and nights near 72°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Del Rio 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 Del Rio peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 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 highHighModerateJun 23UV 11Dec 18UV 4
UV index (midday)Level
Jan5Moderate
Feb6High
Mar8Very high
Apr10Very high
May10Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct7High
Nov5Moderate
Dec4Moderate

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

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Jan 166 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb6Good
Mar7Good
Apr8Good
May13Moderate
Jun14Moderate
Jul17Moderate
Aug12Moderate
Sep10Good
Oct7Good
Nov7Good
Dec6Good
Location & terrain

Where is Del Rio?

Del Rio sits at 29.4°N, 100.9°W, 968 ft above sea level, in United States. The nearest listed city is Ciudad Acuña, 4.3 mi away.

Topography around Del Rio

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

Within 2 miles, the terrain around Del Rio has only modest variations in elevation — a maximum elevation change of 200 ft around an average of 981 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 489 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,773 ft.

The land around Del Rio is covered by artificial surfaces (39%), trees (23%) and shrubs (23%) within 2 miles, shrubs (74%) within 10 miles, and shrubs (78%) within 50 miles.

2 miles
200 ft
10 miles
489 ft
50 miles
3,773 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ciudad Acuña 4.3 mi · Piedras Negras 51 mi · Eagle Pass 51 mi · Nava 66 mi · Uvalde 68 mi · Allende 71 mi · Nueva Rosita 101 mi · Sabinas 105 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 Del Rio (29.3627°, -100.8968°, elevation 968 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).