Coacalco climate

Name: Coacalco
Address: MX

Coacalco is warmest in April, with average highs of 25 °C, and coldest in January, when nights average 5.7 °C. September is the wettest month (109 mm) and December the driest (4.6 mm). Figures are 1991–2020 climate normals.

Across a full year Coacalco averages 538 mm of rain, 58 days above 25 °C and 1 days below freezing.

Mexico · population 277,959 · 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 April 25 °C
Coldest month January 5.7 °C
Driest month December 5 mm
Wettest month September 109 mm
Least cloud March 31 % cloud
Hottest on record May 32 °C
Coldest on record January -2.0 °C

What to expectCoacalco through the year

Coacalco has a clear annual cycle: average daily highs run from 20 °C in January to 25 °C in April, a swing of 5.6 °C in mean temperature across the year.

Counted across a normal year, 58 days a year reach 25 °C, 1 of them reach 30 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 32 °C, in May.

Rain is strongly seasonal. September averages 109 mm against 5 mm in December — 24 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	20.0 °C	9 mm	38 %
February	22.1 °C	7 mm	32 %
March	24.0 °C	8 mm	31 %
April	25.2 °C	19 mm	38 %
May	25.0 °C	29 mm	45 %
June	23.1 °C	90 mm	66 %
July	21.4 °C	100 mm	72 %
August	21.5 °C	103 mm	73 %
September	20.6 °C	109 mm	78 %
October	20.3 °C	47 mm	65 %
November	20.2 °C	12 mm	47 %
December	20.2 °C	5 mm	39 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	20.0 °C	5.7 °C	12.3 °C	25.3 °C	-2.0 °C	0	0
February	22.1 °C	6.7 °C	14.0 °C	29.2 °C	-0.6 °C	3	0
March	24.0 °C	8.0 °C	15.8 °C	31.5 °C	0.0 °C	11	0
April	25.2 °C	10.0 °C	17.5 °C	30.8 °C	2.9 °C	17	0
May	25.0 °C	11.2 °C	17.9 °C	32.3 °C	5.3 °C	16	1
June	23.1 °C	12.2 °C	17.1 °C	30.7 °C	6.3 °C	8	0
July	21.4 °C	11.6 °C	15.9 °C	27.0 °C	5.6 °C	1	0
August	21.5 °C	11.9 °C	16.0 °C	25.7 °C	7.4 °C	0	0
September	20.6 °C	11.7 °C	15.4 °C	25.9 °C	5.1 °C	0	0
October	20.3 °C	9.9 °C	14.4 °C	27.2 °C	-0.3 °C	1	0
November	20.2 °C	7.9 °C	13.5 °C	26.9 °C	-0.5 °C	1	0
December	20.2 °C	6.5 °C	12.9 °C	25.7 °C	-1.0 °C	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	9 mm	2	11 h/day	38 %	58 %	16 km/h
February	7 mm	2	11 h/day	32 %	53 %	17 km/h
March	8 mm	3	12 h/day	31 %	48 %	19 km/h
April	19 mm	5	13 h/day	38 %	47 %	19 km/h
May	29 mm	7	13 h/day	45 %	55 %	18 km/h
June	90 mm	14	13 h/day	66 %	67 %	18 km/h
July	100 mm	18	13 h/day	72 %	74 %	16 km/h
August	103 mm	17	13 h/day	73 %	74 %	17 km/h
September	109 mm	16	12 h/day	78 %	78 %	16 km/h
October	47 mm	9	12 h/day	65 %	74 %	16 km/h
November	12 mm	2	11 h/day	47 %	67 %	15 km/h
December	5 mm	1	11 h/day	39 %	60 %	14 km/h

How Coacalco 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
Coacalco	25 °C	5.7 °C	538 mm	58
Ecatepec de Morelos · Mexico	25 °C	5.4 °C	745 mm	53
Cuautitlán · Mexico	25 °C	5.7 °C	713 mm	59
Cuautitlán Izcalli · Mexico	25 °C	5.4 °C	713 mm	52
Ojo de Agua · Mexico	26 °C	5.9 °C	517 mm	70
Gustavo Adolfo Madero · Mexico	25 °C	5.9 °C	786 mm	55
Nicolás Romero · Mexico	25 °C	5.2 °C	750 mm	46

Where Coacalco ranks

Ranking	Position	Value
The driest places in North America in December	8thof 50	4.6 mm
The driest places in North America in November	14thof 50	12 mm
Places with the best weather in North America year-round	19thof 50	86/100
The driest places in North America in January	20thof 50	8.9 mm
The driest places in North America in February	21stof 50	7.5 mm
The driest places in North America in March	23rdof 50	8.4 mm

Planning a trip? See the best time to visit Coacalco.

QuestionsCommon questions about Coacalco’s climate

When is the best time to visit Coacalco?

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

How hot does Coacalco get?

In April, the warmest month, daily highs average 25 °C. About 1 days a year pass 30 °C. The highest value in the 1991–2020 record is 32 °C.

How cold does it get in winter?

Nights average 5.7 °C in January, the coldest month. A normal year has 1 nights below freezing.

Which month is wettest in Coacalco?

September, averaging 109 mm over 16 days with rain. The driest month is December with 5 mm. The year as a whole averages 538 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 Coacalco 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
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.