Piedras Negras climate
Piedras Negras (Coahuila, Mexico) has a hot semi-arid climate (Köppen BSh). The average temperature over the year is 23 °C73 °F, and about 477 mm19 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Piedras Negras climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 1967 | 642 | 1254 | 160.6 | 2 |
| Feb | 2373 | 846 | 1560 | 100.4 | 1 |
| Mar | 2882 | 1254 | 2068 | 281.1 | 0 |
| Apr | 3290 | 1762 | 2476 | 351.4 | 0 |
| May | 3595 | 2169 | 2882 | 752.9 | 0 |
| Jun | 38100 | 2476 | 3188 | 441.8 | 0 |
| Jul | 3799 | 2577 | 3188 | 522.1 | 0 |
| Aug | 38100 | 2577 | 3289 | 421.7 | 0 |
| Sep | 3493 | 2272 | 2882 | 873.4 | 0 |
| Oct | 3086 | 1762 | 2374 | 451.8 | 0 |
| Nov | 2475 | 1152 | 1763 | 230.9 | 0 |
| Dec | 2068 | 643 | 1355 | 180.7 | 1 |
| Year | 38100 | 642 | 2373 | 47719 | 5 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 60% | 52% | 3.3 | 10:30 |
| Feb | 56% | 54% | 4.1 | 11:08 |
| Mar | 53% | 53% | 5.0 | 11:55 |
| Apr | 51% | 52% | 5.9 | 12:49 |
| May | 56% | 51% | 6.1 | 13:34 |
| Jun | 54% | 41% | 7.0 | 13:58 |
| Jul | 55% | 41% | 6.8 | 13:48 |
| Aug | 52% | 36% | 6.6 | 13:10 |
| Sep | 63% | 42% | 5.4 | 12:17 |
| Oct | 63% | 36% | 4.6 | 11:25 |
| Nov | 62% | 42% | 3.6 | 10:41 |
| Dec | 60% | 48% | 3.1 | 10:19 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Piedras Negras is like
The warmest month is August, with an average high of 38 °C100 °F and a low of 25 °C77 °F. The coldest is January, when highs average 19 °C67 °F and lows 6 °C42 °F. Seasons are strongly marked: the warmest month is on average 19.2 °C34.6 °F warmer than the coldest.
Annual precipitation is moderate at about 477 mm19 in. The wettest three-month stretch is July–September, which brings 38% of the annual total. Months with less than 20 mm0.8 in on average: December–February. The wettest month is September (87 mm3.4 in), the driest is February (10 mm0.4 in).
Relative humidity ranges from 51% in April to 63% in October. The clearest skies (lowest average cloud amount, 36%) are typical of August. Average wind speed near the ground ranges from 8 km/h (5 mph) in December to 12 km/h (7 mph) in June. Daylight lasts from about 10.3 hours in December to 14.0 hours in June.
Best time to visit Piedras Negras
Based on these averages, the most comfortable months for sightseeing and outdoor activities are October–March: average highs of 19 °C67 °F to 30 °C86 °F with 10 mm0.4 in to 45 mm1.8 in of precipitation per month.
The most challenging month is August, which is hot, with average highs of 38 °C100 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Piedras Negras
- Winter (December–February) — highs 1967 to 23 °C73 °F, lows 642 to 8 °C46 °F, about 15 mm0.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Spring (March–May) — highs 2882 to 35 °C95 °F, lows 1254 to 21 °C69 °F, about 46 mm1.8 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3799 to 38 °C100 °F, lows 2476 to 25 °C77 °F, about 46 mm1.8 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 2475 to 34 °C93 °F, lows 1152 to 22 °C72 °F, about 52 mm2.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
How Piedras Negras compares
Compared with Ciudad Acuña, about 81 km to the northwest, Piedras Negras is on average 0.3 °C0.6 °F warmer and receives 16% more precipitation (477 mm19 in vs 412 mm16 in). The difference is largest in February (0.7 °C1.3 °F warmer).
Of the 96 places in Mexico covered by World Climates, Piedras Negras is the 48th warmest by annual mean temperature and the 74th wettest by annual precipitation. See all of them on the Mexico climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Corpus Christi (United States, Cfa), Alice Springs (Australia, BWh) and San Antonio (United States, Cfa).
Nearby places
- Ciudad Acuña 81 km · 23 °C73 °F · 412 mm16 in
- Nuevo Laredo 168 km · 24 °C74 °F · 559 mm22 in
- San Antonio 213 km · 21 °C70 °F · 780 mm31 in
- Monclova 218 km · 23 °C73 °F · 398 mm16 in
- Austin 321 km · 20 °C69 °F · 840 mm33 in
- Corpus Christi 322 km · 23 °C73 °F · 718 mm28 in
- Ciudad General Escobedo 323 km · 24 °C75 °F · 504 mm20 in
- Ciudad Apodaca 326 km · 23 °C74 °F · 636 mm25 in
Frequently asked questions
What is the warmest month in Piedras Negras?
August is the warmest month in Piedras Negras, with an average high of 38 °C (100 °F) and an average low of 25 °C (77 °F).
What is the coldest month in Piedras Negras?
January is the coldest month, with an average high of 19 °C (67 °F) and an average low of 6 °C (42 °F).
When does it rain the most in Piedras Negras?
September is the wettest month with about 87 mm (3.4 in) of precipitation; February is the driest with about 10 mm (0.4 in).
What is the best time to visit Piedras Negras?
Judging by long-term averages, the most comfortable months are October–March.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 310 m, while Piedras Negras lies at about 223 m. Temperatures on this page were therefore adjusted by +0.6 °C1 °F using the standard lapse rate of 6.5 °C per 1,000 m.