Piedras Negras weather in August
In August, Piedras Negras sees average daytime highs of 37°C and overnight lows near 26°C, with 46 mm of rain across 4.6 wet days and about 13 hours of daylight. It is the 1st-warmest and 6th-wettest month of the year here.
Highs ease over the month, from about 38°C in the first days to 36°C by the end. The sky is clear or mostly clear about 57% of the time in August, and the air most often feels muggy.
Daylight stretches from about 13 h 24 min at the start of August to 12 h 36 min by month's end. Set against the rest of the year, August is Piedras Negras's 2nd-clearest and 5th-windiest month. For the whole year in context, see Piedras Negras's year-round climate.
- Daytime high
- 37°
- 1st warmest
- Overnight low
- 26°
- 12th coldest
- Rainfall
- 46 mm
- 4.6 wet days
- Daylight
- 13 hours
- 6:15 AM – 7:17 PM
- Cloud cover
- 41%
- 2nd clearest
- Wind
- 14 km/h
- 5th windiest
- Solar energy
- 6.59 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 August
Highs ease over the month, from about 38°C in the first days to 36°C by the end.
A typical August 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, August runs on par with July and about 4°C warmer than September.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 36 |
| Avg low (°C) | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 38 | 26 |
| 2 | 38 | 26 |
| 3 | 38 | 26 |
| 4 | 38 | 26 |
| 5 | 38 | 26 |
| 6 | 38 | 26 |
| 7 | 38 | 26 |
| 8 | 38 | 26 |
| 9 | 38 | 26 |
| 10 | 38 | 26 |
| 11 | 38 | 26 |
| 12 | 38 | 26 |
| 13 | 38 | 26 |
| 14 | 38 | 26 |
| 15 | 38 | 26 |
| 16 | 38 | 26 |
| 17 | 37 | 26 |
| 18 | 37 | 26 |
| 19 | 37 | 26 |
| 20 | 37 | 26 |
| 21 | 37 | 26 |
| 22 | 37 | 26 |
| 23 | 37 | 26 |
| 24 | 37 | 26 |
| 25 | 37 | 26 |
| 26 | 37 | 26 |
| 27 | 36 | 25 |
| 28 | 36 | 25 |
| 29 | 36 | 25 |
| 30 | 36 | 25 |
| 31 | 36 | 25 |
How August really feels in Piedras Negras
Once humidity and wind are folded in, August 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.
The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Piedras Negras weather by month
How August compares with the rest of the year at a glance. August is the 1st-warmest and 6th-wettest month here — the current month is highlighted below.
| 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 August
The sky is clear or mostly clear about 57% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 24%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 76 | 76 | 76 | 77 | 77 | 77 | 77 | 78 | 78 | 78 | 79 | 79 | 78 | 78 | 78 | 77 | 77 | 77 | 77 | 76 | 76 | 76 | 76 | 76 | 75 | 75 | 75 | 73 | 73 | 73 | 72 |
| Cloudier (%) | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 21 | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 27 | 27 | 27 | 28 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 76 | 24 |
| 2 | 76 | 24 |
| 3 | 76 | 24 |
| 4 | 77 | 23 |
| 5 | 77 | 23 |
| 6 | 77 | 23 |
| 7 | 77 | 23 |
| 8 | 78 | 22 |
| 9 | 78 | 22 |
| 10 | 78 | 22 |
| 11 | 79 | 21 |
| 12 | 79 | 21 |
| 13 | 78 | 22 |
| 14 | 78 | 22 |
| 15 | 78 | 22 |
| 16 | 77 | 23 |
| 17 | 77 | 23 |
| 18 | 77 | 23 |
| 19 | 77 | 23 |
| 20 | 76 | 24 |
| 21 | 76 | 24 |
| 22 | 76 | 24 |
| 23 | 76 | 24 |
| 24 | 76 | 24 |
| 25 | 75 | 25 |
| 26 | 75 | 25 |
| 27 | 75 | 25 |
| 28 | 73 | 27 |
| 29 | 73 | 27 |
| 30 | 73 | 27 |
| 31 | 72 | 28 |
Chance of precipitation in August
Piedras Negras gets around 46 mm of rain over 4.6 wet days in August. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 16% and peaks near 25% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 12 | 12 | 12 | 13 | 13 | 14 | 14 | 15 | 15 | 16 | 16 | 17 | 18 | 18 | 19 | 20 | 21 | 22 | 23 | 23 | 24 | 25 |
| Rain chance (%) | |
|---|---|
| 1 | 13 |
| 2 | 13 |
| 3 | 13 |
| 4 | 12 |
| 5 | 12 |
| 6 | 12 |
| 7 | 11 |
| 8 | 11 |
| 9 | 11 |
| 10 | 12 |
| 11 | 12 |
| 12 | 12 |
| 13 | 13 |
| 14 | 13 |
| 15 | 14 |
| 16 | 14 |
| 17 | 15 |
| 18 | 15 |
| 19 | 16 |
| 20 | 16 |
| 21 | 17 |
| 22 | 18 |
| 23 | 18 |
| 24 | 19 |
| 25 | 20 |
| 26 | 21 |
| 27 | 22 |
| 28 | 23 |
| 29 | 23 |
| 30 | 24 |
| 31 | 25 |
Humidity in August
Most of August feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the muggy band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 79% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 2 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 |
| Humid (%) | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 17 |
| Muggy (%) | 62 | 62 | 63 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 63 | 62 | 61 | 61 | 59 | 59 | 58 | 57 | 57 | 56 | 56 | 55 | 54 | 53 | 50 | 50 | 48 | 47 | 46 | 44 |
| Oppressive (%) | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 23 | 24 | 26 | 27 | 29 | 30 | 32 | 33 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 1 | 20 | 62 | 17 | 0 |
| 2 | 0 | 1 | 20 | 62 | 17 | 0 |
| 3 | 0 | 1 | 20 | 63 | 16 | 0 |
| 4 | 0 | 1 | 19 | 64 | 16 | 0 |
| 5 | 0 | 1 | 19 | 64 | 16 | 0 |
| 6 | 0 | 1 | 19 | 64 | 16 | 0 |
| 7 | 0 | 1 | 19 | 64 | 16 | 0 |
| 8 | 0 | 1 | 19 | 64 | 16 | 0 |
| 9 | 0 | 1 | 18 | 64 | 17 | 0 |
| 10 | 0 | 1 | 18 | 64 | 17 | 0 |
| 11 | 0 | 1 | 18 | 64 | 17 | 0 |
| 12 | 0 | 2 | 18 | 63 | 17 | 0 |
| 13 | 0 | 2 | 18 | 62 | 18 | 0 |
| 14 | 0 | 2 | 19 | 61 | 18 | 0 |
| 15 | 0 | 2 | 19 | 61 | 18 | 0 |
| 16 | 0 | 2 | 19 | 59 | 19 | 1 |
| 17 | 0 | 2 | 19 | 59 | 19 | 1 |
| 18 | 0 | 2 | 20 | 58 | 19 | 1 |
| 19 | 0 | 2 | 20 | 57 | 20 | 1 |
| 20 | 0 | 2 | 20 | 57 | 20 | 1 |
| 21 | 0 | 2 | 20 | 56 | 21 | 1 |
| 22 | 0 | 3 | 19 | 56 | 21 | 1 |
| 23 | 0 | 3 | 19 | 55 | 22 | 1 |
| 24 | 0 | 3 | 19 | 54 | 23 | 1 |
| 25 | 0 | 3 | 19 | 53 | 24 | 1 |
| 26 | 1 | 3 | 19 | 50 | 26 | 1 |
| 27 | 1 | 3 | 18 | 50 | 27 | 1 |
| 28 | 1 | 3 | 18 | 48 | 29 | 1 |
| 29 | 1 | 3 | 18 | 47 | 30 | 1 |
| 30 | 1 | 3 | 17 | 46 | 32 | 1 |
| 31 | 2 | 4 | 17 | 44 | 33 | 1 |
Wind in August
Winds average 14 km/h in August.
Across August, daily wind ranges from about 13 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 15 | light breeze |
| 2 | 15 | light breeze |
| 3 | 15 | light breeze |
| 4 | 15 | light breeze |
| 5 | 15 | light breeze |
| 6 | 15 | light breeze |
| 7 | 15 | light breeze |
| 8 | 15 | light breeze |
| 9 | 15 | light breeze |
| 10 | 15 | light breeze |
| 11 | 15 | light breeze |
| 12 | 15 | light breeze |
| 13 | 15 | light breeze |
| 14 | 15 | light breeze |
| 15 | 15 | light breeze |
| 16 | 15 | light breeze |
| 17 | 15 | light breeze |
| 18 | 15 | light breeze |
| 19 | 15 | light breeze |
| 20 | 15 | light breeze |
| 21 | 14 | light breeze |
| 22 | 14 | light breeze |
| 23 | 14 | light breeze |
| 24 | 14 | light breeze |
| 25 | 14 | light breeze |
| 26 | 14 | light breeze |
| 27 | 14 | light breeze |
| 28 | 14 | light breeze |
| 29 | 13 | light breeze |
| 30 | 13 | light breeze |
| 31 | 13 | light breeze |
Sunrise & sunset in August
Daylight runs from about 13 h 24 min at the start of August to 12 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 48 minutes over August. Sunrise moves from 6:07 AM to 6:23 AM, and sunset from 7:30 PM to 7:01 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.4 | 13.4 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.2 | 13.2 | 13.1 | 13.1 | 13.1 | 13.1 | 13.0 | 13.0 | 13.0 | 13.0 | 12.9 | 12.9 | 12.9 | 12.9 | 12.8 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.7 | 12.6 |
| Sunrise (AM) | 6:07 | 6:07 | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:23 | 6:23 |
| Sunset (PM) | 7:30 | 7:29 | 7:28 | 7:28 | 7:27 | 7:26 | 7:25 | 7:24 | 7:24 | 7:23 | 7:22 | 7:21 | 7:20 | 7:19 | 7:18 | 7:17 | 7:16 | 7:15 | 7:14 | 7:13 | 7:12 | 7:11 | 7:10 | 7:09 | 7:08 | 7:07 | 7:06 | 7:05 | 7:03 | 7:02 | 7:01 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.4 | 6:07 | 7:30 |
| 2 | 13.4 | 6:07 | 7:29 |
| 3 | 13.3 | 6:08 | 7:28 |
| 4 | 13.3 | 6:08 | 7:28 |
| 5 | 13.3 | 6:09 | 7:27 |
| 6 | 13.3 | 6:09 | 7:26 |
| 7 | 13.3 | 6:10 | 7:25 |
| 8 | 13.2 | 6:11 | 7:24 |
| 9 | 13.2 | 6:11 | 7:24 |
| 10 | 13.2 | 6:12 | 7:23 |
| 11 | 13.2 | 6:12 | 7:22 |
| 12 | 13.1 | 6:13 | 7:21 |
| 13 | 13.1 | 6:13 | 7:20 |
| 14 | 13.1 | 6:14 | 7:19 |
| 15 | 13.1 | 6:15 | 7:18 |
| 16 | 13.0 | 6:15 | 7:17 |
| 17 | 13.0 | 6:16 | 7:16 |
| 18 | 13.0 | 6:16 | 7:15 |
| 19 | 13.0 | 6:17 | 7:14 |
| 20 | 12.9 | 6:17 | 7:13 |
| 21 | 12.9 | 6:18 | 7:12 |
| 22 | 12.9 | 6:18 | 7:11 |
| 23 | 12.9 | 6:19 | 7:10 |
| 24 | 12.8 | 6:20 | 7:09 |
| 25 | 12.8 | 6:20 | 7:08 |
| 26 | 12.8 | 6:21 | 7:07 |
| 27 | 12.7 | 6:21 | 7:06 |
| 28 | 12.7 | 6:22 | 7:05 |
| 29 | 12.7 | 6:22 | 7:03 |
| 30 | 12.7 | 6:23 | 7:02 |
| 31 | 12.6 | 6:23 | 7:01 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 6.59 kWh/m².
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 — August's 6.59 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.7 | 6.7 | 6.7 | 6.6 | 6.6 | 6.6 | 6.5 | 6.5 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 | 6.2 | 6.2 | 6.1 | 6.1 | 6.0 | 6.0 | 5.9 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.9 | Intense |
| 2 | 6.9 | Intense |
| 3 | 6.9 | Intense |
| 4 | 6.9 | Intense |
| 5 | 6.9 | Intense |
| 6 | 6.9 | Intense |
| 7 | 6.8 | Intense |
| 8 | 6.8 | Intense |
| 9 | 6.8 | Intense |
| 10 | 6.8 | Intense |
| 11 | 6.8 | Intense |
| 12 | 6.7 | Intense |
| 13 | 6.7 | Intense |
| 14 | 6.7 | Intense |
| 15 | 6.6 | Intense |
| 16 | 6.6 | Intense |
| 17 | 6.6 | Intense |
| 18 | 6.5 | Intense |
| 19 | 6.5 | Intense |
| 20 | 6.4 | Intense |
| 21 | 6.4 | Intense |
| 22 | 6.4 | Intense |
| 23 | 6.3 | Intense |
| 24 | 6.3 | Intense |
| 25 | 6.2 | Intense |
| 26 | 6.2 | Intense |
| 27 | 6.1 | Intense |
| 28 | 6.1 | Intense |
| 29 | 6.0 | Intense |
| 30 | 6.0 | Bright |
| 31 | 5.9 | Bright |
Is August a good time to visit Piedras Negras?
Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
August is a weaker month for outdoor sightseeing in Piedras Negras.
What to pack for Piedras Negras in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Piedras Negras sees daytime highs around 37°C and nights near 26°C. Pack light clothes and sun protection. About 5 days see rain.
UV index in Piedras Negras in August
Clear-sky midday UV in August 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.
| 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 August
Average fine-particle pollution (PM2.5) through the year — so you can see where August 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. 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).