Piedras Negras in Fall
In fall (September, October and November), Piedras Negras sees average daytime highs around 29°C and overnight lows near 18°C, with 175 mm of rain over about 20 wet days across the season. It is the 3rd-warmest season and the wettest season of the year.
Over the season highs ease from about 35°C in early September to 21°C by late November. The sky is clear or mostly clear about 54% of the time across fall, and the air most often feels dry.
Fall is Piedras Negras's 2nd-best season to visit on our travel score. For the whole year in context, see Piedras Negras's year-round climate.
- Avg daytime high
- 29°C
- 3rd-warmest season
- Avg overnight low
- 18°C
- Rainfall
- 175 mm
- 20 wet days
- Avg wind
- 12 km/h
- Travel score
- 5.8
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Piedras Negras in Fall
Over the season highs ease from about 35°C in early September to 21°C by late November.
A typical fall day in Piedras Negras reaches about 29°C and drops to 18°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Piedras Negras
Once humidity and wind are folded in, fall brings about 31 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Piedras Negras weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 19° / 7° | 25 | 4.4 | 10.4 | 7.1 |
| Feb | 22° / 10° | 27 | 4.5 | 11 | 7.6 |
| Mar | 26° / 14° | 43 | 5.6 | 11.8 | 7.5 |
| Apr | 30° / 18° | 48 | 6.1 | 12.7 | 5.5 |
| May | 33° / 22° | 74 | 8.3 | 13.4 | 3.5 |
| Jun | 36° / 25° | 46 | 6.1 | 13.8 | 2.1 |
| Jul | 37° / 26° | 50 | 5.9 | 13.6 | 1.6 |
| Aug | 37° / 26° | 46 | 4.6 | 13 | 1.6 |
| Sep | 34° / 23° | 79 | 8.3 | 12.2 | 3.5 |
| Oct | 29° / 18° | 60 | 6.5 | 11.3 | 6.2 |
| Nov | 23° / 12° | 36 | 4.8 | 10.6 | 7.8 |
| Dec | 19° / 8° | 27 | 4.5 | 10.2 | 7.1 |
Cloud cover in Fall
The sky is clear or mostly clear about 54% of the time across fall.
Chance of precipitation in Fall
Piedras Negras gets around 175 mm of rain over 20 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 12 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 36 min in early September to 10 h 18 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.3 kWh/m².
Is fall a good time to visit Piedras Negras?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Piedras Negras for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Piedras Negras in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Piedras Negras sees daytime highs around 29°C and nights near 18°C. Pack light clothes. Worth having: rain gear and sun protection. About 20 days see rain.
UV index in Piedras Negras in Fall
Clear-sky midday UV across fall averages around 7 — enough to warrant sun protection. 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 6 | 7 | 10 | 10 | 11 | 11 | 11 | 9 | 7 | 5 | 4 |
| Level | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 6 | High |
| Mar | 7 | Very high |
| Apr | 10 | Very high |
| May | 10 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 7 | High |
| Nov | 5 | Moderate |
| Dec | 4 | Moderate |
Air quality in Piedras Negras in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 8 | 9 | 10 | 16 | 16 | 18 | 13 | 12 | 9 | 10 | 11 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 8 | Good |
| Mar | 9 | Good |
| Apr | 10 | Good |
| May | 16 | Moderate |
| Jun | 16 | Moderate |
| Jul | 18 | Moderate |
| Aug | 13 | Moderate |
| Sep | 12 | Good |
| Oct | 9 | Good |
| Nov | 10 | Good |
| Dec | 11 | Good |
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.
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
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.