Piedras Negras climate

Name: Piedras Negras
Address: MX

Piedras Negras is warmest in August, with average highs of 37 °C, and coldest in January, when nights average 8.0 °C. September is the wettest month (79 mm) and January the driest (25 mm). Figures are 1991–2020 climate normals.

Across a full year Piedras Negras averages 563 mm of rain, 259 days above 25 °C and 1 days below freezing.

Mexico · population 150,178 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 37 °C
Coldest month January 8.0 °C
Driest month January 25 mm
Wettest month September 79 mm
Least cloud October 37 % cloud
Hottest on record June 44 °C
Coldest on record February -6.7 °C

What to expectPiedras Negras through the year

Piedras Negras has a clear annual cycle: average daily highs run from 20 °C in January to 37 °C in August, a swing of 18 °C in mean temperature across the year.

Counted across a normal year, 259 days a year reach 25 °C, 182 of them reach 30 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 44 °C, in June.

Rain is strongly seasonal. September averages 79 mm against 25 mm in January — 3.2 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	19.8 °C	25 mm	49 %
February	23.0 °C	27 mm	49 %
March	26.7 °C	43 mm	49 %
April	30.8 °C	48 mm	47 %
May	33.4 °C	74 mm	48 %
June	36.1 °C	47 mm	39 %
July	36.7 °C	51 mm	41 %
August	37.0 °C	47 mm	39 %
September	33.1 °C	79 mm	42 %
October	29.2 °C	59 mm	37 %
November	23.5 °C	36 mm	44 %
December	19.7 °C	27 mm	48 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	19.8 °C	8.0 °C	12.9 °C	33.0 °C	-4.6 °C	5	0	1
February	23.0 °C	10.3 °C	15.5 °C	38.8 °C	-6.7 °C	11	2	0
March	26.7 °C	14.0 °C	19.4 °C	37.9 °C	-0.2 °C	21	8	0
April	30.8 °C	17.9 °C	23.5 °C	41.6 °C	4.5 °C	27	18	0
May	33.4 °C	21.8 °C	27.0 °C	42.9 °C	9.0 °C	31	24	0
June	36.1 °C	25.0 °C	30.2 °C	43.5 °C	17.6 °C	30	29	0
July	36.7 °C	25.8 °C	31.0 °C	43.1 °C	20.9 °C	31	30	0
August	37.0 °C	26.3 °C	31.4 °C	41.8 °C	21.3 °C	31	30	0
September	33.1 °C	23.2 °C	27.8 °C	43.0 °C	12.6 °C	30	25	0
October	29.2 °C	18.6 °C	23.4 °C	38.7 °C	2.8 °C	27	15	0
November	23.5 °C	13.1 °C	17.5 °C	33.5 °C	-0.5 °C	13	1	0
December	19.7 °C	8.7 °C	13.3 °C	31.9 °C	-3.7 °C	4	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	25 mm	4	11 h/day	49 %	61 %	19 km/h
February	27 mm	4	11 h/day	49 %	58 %	20 km/h
March	43 mm	5	12 h/day	49 %	57 %	22 km/h
April	48 mm	6	13 h/day	47 %	54 %	24 km/h
May	74 mm	8	14 h/day	48 %	59 %	23 km/h
June	47 mm	6	14 h/day	39 %	56 %	23 km/h
July	51 mm	6	14 h/day	41 %	53 %	23 km/h
August	47 mm	4	13 h/day	39 %	51 %	21 km/h
September	79 mm	8	12 h/day	42 %	60 %	18 km/h
October	59 mm	6	12 h/day	37 %	61 %	19 km/h
November	36 mm	5	11 h/day	44 %	62 %	19 km/h
December	27 mm	4	10 h/day	48 %	63 %	19 km/h

How Piedras Negras compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Piedras Negras	37 °C	8.0 °C	563 mm	259
Ciudad Acuña · Mexico	36 °C	7.3 °C	481 mm	248
Nuevo Laredo · Mexico	37 °C	10 °C	497 mm	281
San Antonio · United States	35 °C	7.2 °C	861 mm	227
Monclova · Mexico	35 °C	8.4 °C	399 mm	268
Corpus Christi · United States	32 °C	12 °C	781 mm	215
Austin · United States	35 °C	6.3 °C	924 mm	216

Where Piedras Negras ranks

Ranking	Position	Value
The warmest places in North America in August	10th of 50	37 °C
Places with the best weather in North America in November	11th of 50	96/100
The warmest places in North America in June	12th of 50	36 °C
The warmest places in North America in July	13th of 50	37 °C
The warmest places in North America in September	15th of 50	33 °C
Places with the best weather in North America in February	16th of 50	94/100

Planning a trip? See the best time to visit Piedras Negras.

QuestionsCommon questions about Piedras Negras’s climate

When is the best time to visit Piedras Negras?

That depends on what you want, so the honest answer is a comparison rather than a single month. March, October, November sit closest to 20 °C on average, August is the warmest month and January the driest. The month-by-month table above has the full picture.

How hot does Piedras Negras get?

In August, the warmest month, daily highs average 37 °C. About 182 days a year pass 30 °C. The highest value in the 1991–2020 record is 44 °C.

How cold does it get in winter?

Nights average 8.0 °C in January, the coldest month. A normal year has 1 nights below freezing.

Which month is wettest in Piedras Negras?

September, averaging 79 mm over 8 days with rain. The driest month is January with 25 mm. The year as a whole averages 563 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Piedras Negras rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 28.700°, -100.524° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.