Río Cuarto climate

Name: Río Cuarto
Address: AR

Río Cuarto is warmest in January, with average highs of 29 °C, and coldest in July, when nights average 4.9 °C. December is the wettest month (106 mm) and July the driest (12 mm). Figures are 1991–2020 climate normals.

Across a full year Río Cuarto averages 737 mm of rain, 136 days above 25 °C and 4 days below freezing.

Argentina · population 157,010 · 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 January 29 °C
Coldest month July 4.9 °C
Driest month July 12 mm
Wettest month December 106 mm
Least cloud August 37 % cloud
Hottest on record December 40 °C
Coldest on record July -14 °C

What to expectRío Cuarto through the year

Río Cuarto has a clear annual cycle: average daily highs run from 15 °C in July to 29 °C in January, a swing of 14 °C in mean temperature across the year.

Counted across a normal year, 136 days a year reach 25 °C, 39 of them reach 30 °C, 4 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in December.

Rain is strongly seasonal. December averages 106 mm against 12 mm in July — 8.9 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	28.8 °C	94 mm	41 %
February	27.1 °C	90 mm	41 %
March	25.4 °C	91 mm	40 %
April	21.9 °C	65 mm	43 %
May	18.2 °C	34 mm	52 %
June	15.5 °C	14 mm	45 %
July	14.8 °C	12 mm	43 %
August	17.8 °C	20 mm	37 %
September	20.3 °C	39 mm	40 %
October	23.1 °C	85 mm	46 %
November	26.1 °C	87 mm	43 %
December	28.3 °C	106 mm	41 %

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	28.8 °C	18.9 °C	23.6 °C	38.8 °C	10.6 °C	27	11	0
February	27.1 °C	17.7 °C	22.1 °C	35.3 °C	8.4 °C	21	6	0
March	25.4 °C	16.3 °C	20.4 °C	34.4 °C	5.4 °C	17	3	0
April	21.9 °C	12.8 °C	16.8 °C	31.9 °C	2.1 °C	7	0	0
May	18.2 °C	9.4 °C	13.2 °C	30.8 °C	-2.1 °C	1	0	0
June	15.5 °C	6.0 °C	10.1 °C	26.0 °C	-3.3 °C	0	0	1
July	14.8 °C	4.9 °C	9.1 °C	27.9 °C	-14.5 °C	0	0	2
August	17.8 °C	6.8 °C	11.7 °C	35.2 °C	-3.3 °C	3	0	1
September	20.3 °C	9.3 °C	14.3 °C	36.9 °C	-3.2 °C	5	0	0
October	23.1 °C	12.5 °C	17.3 °C	39.3 °C	2.4 °C	11	2	0
November	26.1 °C	15.4 °C	20.4 °C	37.6 °C	4.3 °C	18	5	0
December	28.3 °C	17.8 °C	22.8 °C	39.6 °C	8.7 °C	25	10	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	94 mm	11	14 h/day	41 %	64 %	17 km/h
February	90 mm	9	13 h/day	41 %	68 %	16 km/h
March	91 mm	9	12 h/day	40 %	70 %	17 km/h
April	65 mm	7	11 h/day	43 %	71 %	16 km/h
May	34 mm	4	10 h/day	52 %	74 %	16 km/h
June	14 mm	2	10.0 h/day	45 %	72 %	16 km/h
July	12 mm	2	10 h/day	43 %	68 %	16 km/h
August	20 mm	3	11 h/day	37 %	60 %	18 km/h
September	39 mm	5	12 h/day	40 %	57 %	19 km/h
October	85 mm	9	13 h/day	46 %	60 %	19 km/h
November	87 mm	10	14 h/day	43 %	58 %	19 km/h
December	106 mm	10	14 h/day	41 %	59 %	18 km/h

How Río Cuarto 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
Río Cuarto	29 °C	4.9 °C	737 mm	136
San Luis · Argentina	30 °C	5.1 °C	667 mm	152
Córdoba · Argentina	29 °C	5.0 °C	888 mm	145
Rosario · Argentina	30 °C	7.1 °C	1,041 mm	148
Santa Fe · Argentina	31 °C	8.3 °C	1,139 mm	163
Paraná · Argentina	30 °C	8.2 °C	1,092 mm	155

Where Río Cuarto ranks

Ranking	Position	Value
Places with the best weather in South America in April	13th of 50	93/100
Places with the best weather in South America in September	14th of 50	93/100
Places with the best weather in South America in October	24th of 50	90/100
The coolest places in South America in July	24th of 50	15 °C
The coolest places in South America in June	27th of 50	16 °C
Places with the best weather in South America year-round	28th of 50	83/100

Planning a trip? See the best time to visit Río Cuarto.

QuestionsCommon questions about Río Cuarto’s climate

When is the best time to visit Río Cuarto?

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

How hot does Río Cuarto get?

In January, the warmest month, daily highs average 29 °C. About 39 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 4.9 °C in July, the coldest month. A normal year has 4 nights below freezing.

Which month is wettest in Río Cuarto?

December, averaging 106 mm over 10 days with rain. The driest month is July with 12 mm. The year as a whole averages 737 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 Río Cuarto 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: -33.130°, -64.353° (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.