Climate averages 1991–2020
Piedras Negras weather
in July.
A very hot, moderately wet month: the 2nd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a very hot month in Piedras Negras: daytime highs average 36.6°C and nights cool to about 25.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 50 mm of rain on roughly 6 days, which makes July a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 47 min on an average July day.
The nearest other city in this atlas is Ciudad Acuña (81 km away). In July its highs average 35.8°C, 0.8°C cooler than Piedras Negras, with 41 mm of rain.
Among the 153 cities listed in Mexico, Piedras Negras ranks 7th of 153 for the warmest July highs and joint 20th of 153 for the driest July (rainfall, lowest first). The mean July high of those 153 cities is 28.0°C; Piedras Negras is 8.6°C warmer than that mean.
From July to August, average highs rise by 0.3°C to 36.8°C, and monthly rainfall falls from 50 mm to 46 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Piedras Negras climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.0°C7.9°C | 7.9°C | 25 | 4.3 | 10.511 h |
| February | 21.9°C10.2°C | 10.2°C | 27 | 4.5 | 11.211 h |
| March | 25.7°C13.9°C | 13.9°C | 43 | 5.6 | 12.012 h |
| April | 29.9°C17.8°C | 17.8°C | 48 | 6.1 | 12.813 h |
| May | 32.9°C21.8°C | 21.8°C | 74 | 8.3 | 13.614 h |
| June | 35.9°C25.0°C | 25.0°C | 46 | 6.1 | 13.914 h |
| July, selected | 36.6°C25.8°C | 25.8°C | 50 | 5.9 | 13.814 h |
| August | 36.8°C26.4°C | 26.4°C | 46 | 4.6 | 13.213 h |
| September | 32.8°C23.2°C | 23.2°C | 79 | 8.3 | 12.412 h |
| October | 28.7°C18.5°C | 18.5°C | 60 | 6.5 | 11.511 h |
| November | 22.9°C12.9°C | 12.9°C | 36 | 4.8 | 10.711 h |
| December | 19.1°C8.5°C | 8.5°C | 27 | 4.5 | 10.410 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Ciudad Acuña in JulyMexico · 81 kmHigh 35.8°C · Low 25.6°C · 41 mm rain
- Nuevo Laredo in JulyMexico · 168 kmHigh 37.2°C · Low 25.6°C · 45 mm rain
- San Antonio in JulyUnited States · 213 kmHigh 34.5°C · Low 24.1°C · 50 mm rain
- Monclova in JulyMexico · 218 kmHigh 33.9°C · Low 23.8°C · 59 mm rain
- New Braunfels in JulyUnited States · 258 kmHigh 34.3°C · Low 24.0°C · 45 mm rain
- San Angelo in JulyUnited States · 307 kmHigh 34.7°C · Low 23.8°C · 33 mm rain
- Austin in JulyUnited States · 321 kmHigh 34.6°C · Low 24.4°C · 42 mm rain
- Corpus Christi in JulyUnited States · 322 kmHigh 32.4°C · Low 25.7°C · 58 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Piedras Negras) is explained once on the Piedras Negras year overview and on the Sources, method and limits page.