Valle Hermoso weather in September

In September, Valle Hermoso sees average daytime highs of 33°C and overnight lows near 24°C, with 106 mm of rain across 14.8 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 34°C in the first days to 32°C by the end. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Valle Hermoso's 8th-clearest and 12th-windiest month. For the whole year in context, see Valle Hermoso's year-round climate.

Daytime high
33°
4th warmest
Overnight low
24°
9th coldest
Rainfall
106 mm
14.8 wet days
Daylight
12 h 06 min
6:21 AM – 6:30 PM
Cloud cover
54%
8th clearest
Wind
12 km/h
12th windiest
Solar energy
5.2 kWh/m²
Travel score
3.4
out of 10

Valle Hermoso is municipal seat of Valle Hermoso, State of Tamaulipas, Mexico.

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 34°C in the first days to 32°C by the end.

A typical September day in Valle Hermoso reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13425
23425
33425
43425
53325
63325
73325
83325
93324
103324
113324
123324
133324
143324
153324
163224
173224
183224
193224
203223
213223
223223
233223
243223
253223
263223
273223
283223
293222
303122

How September really feels in Valle Hermoso

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
8 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
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.

Valle Hermoso 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 (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 12°285.310.67.3
Feb24° / 14°224.711.17.7
Mar27° / 17°34611.87.2
Apr29° / 20°425.812.65.9
May32° / 23°466.913.24.5
Jun34° / 25°599.713.63.3
Jul34° / 25°638.513.43.0
Aug35° / 25°5310.212.92.7
Sep33° / 24°10614.812.23.4
Oct30° / 20°648.811.45.4
Nov26° / 16°406.610.77.3
Dec23° / 13°315.610.47.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25644
35545
45545
55446
65446
75347
85347
95347
105347
115347
125446
135446
145545
155545
165644
175644
185743
195842
205842
215941
226040
236238
246337
256337
266436
276634
286634
296634
306634

Chance of precipitation in September

Any precipitation

Valle Hermoso gets around 106 mm of rain over 14.8 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 48% and peaks near 56% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
249
350
451
553
654
755
856
956
1056
1155
1255
1354
1453
1552
1651
1750
1849
1948
2046
2145
2243
2342
2441
2540
2639
2738
2838
2937
3037

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100145639
200145639
300145639
400145639
500145540
600245440
700255241
800255241
900255142
1000255142
1100354943
1200364843
1300464743
1400464743
1500474642
1601574641
1701584640
1801684539
1901794538
2002894437
21128104435
22129114334
231310124332
241311124330
251411134328
261412144326
271412154325
281513154323
292513164322
302513164320

Wind in September

Winds average 12 km/h in September, the calmest month.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 6:15 AM to 6:27 AM, and sunset from 6:47 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:156:47
212.56:156:46
312.56:166:45
412.56:166:44
512.46:176:42
612.46:176:41
712.46:186:40
812.46:186:39
912.36:186:38
1012.36:196:37
1112.36:196:36
1212.36:206:35
1312.26:206:33
1412.26:206:32
1512.26:216:31
1612.16:216:30
1712.16:226:29
1812.16:226:28
1912.16:226:27
2012.06:236:25
2112.06:236:24
2212.06:246:23
2312.06:246:22
2411.96:246:21
2511.96:256:20
2611.96:256:19
2711.96:266:18
2811.86:266:16
2911.86:276:15
3011.86:276:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.2 kWh/m².

For context, solar energy here swings from a low near 3.02 kWh/m² to a high of 6.72 kWh/m² in July across the year — September's 5.2 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Valle Hermoso

In seasonPeak

In September, Valle Hermoso sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Valle Hermoso sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Valle Hermoso?

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

3.4
Sightseeing
9th-best month of the year
5.8
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Valle Hermoso.

What to pack for Valle Hermoso in September

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

In September, Valle Hermoso sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Valle Hermoso in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 55 km away) is warmest in September at about 29°C and coldest in February near 19°C.

It's comfortable for a long swim from Mar 6 to Jan 9 — about 10.2 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan20Cool
Feb19Cool
Mar20Refreshing
Apr23Refreshing
May26Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct27Warm
Nov24Warm
Dec22Refreshing

UV index in Valle Hermoso in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Valle Hermoso peaks around June 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeExtremeVery highHighJun 21UV 12Dec 23UV 5
UV index (midday)Level
Jan5High
Feb7Very high
Mar8Very high
Apr11Extreme
May9Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Valle Hermoso 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 Valle Hermoso is worst in July — around 34 µg/m³ PM2.5 (moderate), about 4.7× the cleanest month (November, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1934 µg/m³Nov 117 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr14Moderate
May21Moderate
Jun28Moderate
Jul34Moderate
Aug31Moderate
Sep15Moderate
Oct8Good
Nov7Good
Dec9Good
Location & terrain

Where is Valle Hermoso?

Valle Hermoso sits at 25.7°N, 97.8°W, 16 m above sea level, in Mexico. The nearest listed city is Heroica Matamoros, 38 km away.

Topography around Valle Hermoso

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Valle Hermoso.

Within 3 km, the terrain around Valle Hermoso has only modest variations in elevation — a maximum elevation change of 6 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 19 m; within 80 km, significant variations in elevation — a maximum elevation change of 293 m.

The land around Valle Hermoso is covered by artificial surfaces (41%) and cropland (38%) within 3 km, cropland (90%) within 16 km, and cropland (42%) within 80 km.

3 km
6 m
16 km
19 m
80 km
293 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Heroica Matamoros 38 km · Brownsville 41 km · Ciudad Río Bravo 44 km · Mercedes 54 km · San Benito 54 km · Weslaco 57 km · Harlingen 59 km · Donna 60 km

Mexico travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 / 127 V · 60 Hz
Prices
≈ 54% of US
price level, 2025
GDP per capita
$13,889
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
12.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 440
Religion
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Valle Hermoso (25.6732°, -97.8127°, elevation 16 m), 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).