Piedras Negras weather in July

In July, Piedras Negras sees average daytime highs of 37°C and overnight lows near 26°C, with 50 mm of rain across 5.9 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 37°C through the month. The sky is clear or mostly clear about 54% of the time in July, and the air most often feels muggy.

Daylight stretches from about 13 h 48 min at the start of July to 13 h 24 min by month's end. Set against the rest of the year, July is Piedras Negras's 4th-clearest and 2nd-windiest month. For the whole year in context, see Piedras Negras's year-round climate.

Daytime high
37°
2nd warmest
Overnight low
26°
11th coldest
Rainfall
50 mm
5.9 wet days
Daylight
13 h 42 min
5:58 AM – 7:38 PM
Cloud cover
43%
4th clearest
Wind
16 km/h
2nd windiest
Solar energy
6.86 kWh/m²
Travel score
1.6
out of 10

Piedras Negras is municipal seat of Piedras Negras, State of Coahuila, Mexico.

Founded
1850

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 37°C through the month.

A typical July day in Piedras Negras reaches about 37°C in the afternoon and slips back to 26°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 33°C and 40°C. Set against its neighbours, July runs about 1°C warmer than June and on par with August.

20°25°30°35°40°45°151015202531
Avg high (°C)Avg low (°C)
13725
23725
33725
43725
53726
63726
73726
83726
93726
103726
113726
123726
133726
143726
153726
163726
173726
183726
193726
203726
213726
223726
233726
243726
253726
263826
273826
283826
293826
303826
313826

How July really feels in Piedras Negras

Once humidity and wind are folded in, July averages 31 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
31
31 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

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

Piedras Negras weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 254.410.47.1
Feb22° / 10°274.5117.6
Mar26° / 14°435.611.87.5
Apr30° / 18°486.112.75.5
May33° / 22°748.313.43.5
Jun36° / 25°466.113.82.1
Jul37° / 26°505.913.61.6
Aug37° / 26°464.6131.6
Sep34° / 23°798.312.23.5
Oct29° / 18°606.511.36.2
Nov23° / 12°364.810.67.8
Dec19° / 274.510.27.1

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 18% of July, with mostly cloudy or overcast conditions the remaining 27%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16931
26832
36832
46832
56832
66832
76832
86931
97030
107129
117228
127327
137327
147426
157426
167525
177525
187624
197525
207525
217525
227525
237525
247426
257426
267426
277426
287525
297525
307525
317624

Chance of precipitation in July

Any precipitation

Piedras Negras gets around 50 mm of rain over 5.9 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 18% and peaks near 24% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
124
224
324
423
523
622
721
821
920
1019
1119
1218
1318
1417
1517
1617
1717
1817
1917
2017
2117
2217
2317
2417
2517
2616
2716
2815
2915
3014
3114

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the muggy band about 52% of days. Sticky, muggy-or-worse air turns up on roughly 78% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
121647331
221647331
321648321
421748321
521749311
611751301
711851291
811851291
911852281
1011952271
1111952271
1212052261
1312052261
1422051261
1522152250
1622152250
1722153240
1822153240
1922153240
2022153240
2122153240
2222154230
2322154230
2422253230
2522254220
2622255210
2722256200
2822257190
2922158190
3012160180
3112161170

Wind in July

Winds average 16 km/h in July.

Across July, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 13 h 48 min at the start of July to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over July. Sunrise moves from 5:51 AM to 6:06 AM, and sunset from 7:40 PM to 7:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:517:40
213.85:527:40
313.85:527:40
413.85:527:40
513.85:537:40
613.85:537:40
713.85:547:39
813.85:547:39
913.75:547:39
1013.75:557:39
1113.75:557:39
1213.75:567:39
1313.75:567:38
1413.75:577:38
1513.75:577:38
1613.75:587:38
1713.75:587:37
1813.65:597:37
1913.65:597:37
2013.66:007:36
2113.66:007:36
2213.66:017:35
2313.66:027:35
2413.56:027:34
2513.56:037:34
2613.56:037:33
2713.56:047:33
2813.56:047:32
2913.46:057:32
3013.46:057:31
3113.46:067:30

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.86 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.04 kWh/m² to a high of 6.86 kWh/m² in July across the year — July's 6.86 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.8Intense
126.9Intense
136.9Intense
146.9Intense
156.9Intense
166.9Intense
176.9Intense
186.9Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
247.0Intense
257.0Intense
267.0Intense
276.9Intense
286.9Intense
296.9Intense
306.9Intense
316.9Intense
Planning a trip in July

Is July a good time to visit Piedras Negras?

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

1.6
Sightseeing
11th-best month of the year
4.7
Beach & pool
10th-best month of the year

July is a weaker month for outdoor sightseeing in Piedras Negras.

What to pack for Piedras Negras in July

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

In July, Piedras Negras sees daytime highs around 37°C and nights near 26°C. Pack light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in Piedras Negras in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Piedras Negras peaks around July 14 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighModerateJul 14UV 11Dec 18UV 4
UV index (midday)Level
Jan5Moderate
Feb6High
Mar7Very high
Apr10Very high
May10Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct7High
Nov5Moderate
Dec4Moderate

Air quality in Piedras Negras in July

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Piedras Negras is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (February, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Feb 178 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb8Good
Mar9Good
Apr10Good
May16Moderate
Jun16Moderate
Jul18Moderate
Aug13Moderate
Sep12Good
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is Piedras Negras?

Piedras Negras sits at 28.7°N, 100.5°W, 223 m above sea level, in Mexico. The nearest listed city is Eagle Pass, 3.0 km away.

Topography around Piedras Negras

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

Within 3 km, the terrain around Piedras Negras has only modest variations in elevation — a maximum elevation change of 52 m around an average of 227 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 110 m; within 80 km, significant variations in elevation — a maximum elevation change of 586 m.

The land around Piedras Negras is covered by artificial surfaces (60%) within 3 km, shrubs (70%) within 16 km, and shrubs (89%) within 80 km.

3 km
52 m
16 km
110 m
80 km
586 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Eagle Pass 3.0 km · Nava 39 km · Allende 51 km · Ciudad Acuña 81 km · Del Rio 82 km · Uvalde 91 km · Nueva Rosita 109 km · Sabinas 110 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 Piedras Negras (28.7001°, -100.5235°, elevation 223 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. 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).