Formosa climate

Name: Formosa
Address: AR

Formosa is warmest in January, with average highs of 32 °C, and coldest in July, when nights average 13 °C. November is the wettest month (185 mm) and August the driest (64 mm). Figures are 1991–2020 climate normals.

Across a full year Formosa averages 1,569 mm of rain and 248 days above 25 °C.

Argentina · population 222,226 · 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 32 °C
Coldest month July 13 °C
Driest month August 64 mm
Wettest month November 185 mm
Least cloud August 40 % cloud
Hottest on record October 41 °C
Coldest on record July 0.9 °C

What to expectFormosa through the year

Formosa has a clear annual cycle: average daily highs run from 21 °C in July to 32 °C in January, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 248 days a year reach 25 °C, 127 of them reach 30 °C. The warmest reading in the 1991–2020 record is 41 °C, in October.

Rain is strongly seasonal. November averages 185 mm against 64 mm in August — 2.9 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	32.4 °C	121 mm	49 %
February	31.4 °C	144 mm	49 %
March	30.0 °C	136 mm	46 %
April	27.0 °C	156 mm	47 %
May	23.1 °C	125 mm	52 %
June	21.5 °C	99 mm	54 %
July	21.1 °C	80 mm	46 %
August	23.8 °C	64 mm	40 %
September	25.9 °C	110 mm	43 %
October	28.1 °C	185 mm	52 %
November	29.4 °C	185 mm	47 %
December	31.3 °C	164 mm	50 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	32.4 °C	23.8 °C	27.8 °C	38.7 °C	16.1 °C	31	25
February	31.4 °C	23.2 °C	27.0 °C	39.0 °C	14.2 °C	28	19
March	30.0 °C	21.8 °C	25.6 °C	38.9 °C	10.8 °C	29	16
April	27.0 °C	19.1 °C	22.7 °C	35.1 °C	7.3 °C	21	8
May	23.1 °C	15.8 °C	19.0 °C	33.2 °C	4.1 °C	11	1
June	21.5 °C	14.3 °C	17.4 °C	30.9 °C	1.4 °C	9	0
July	21.1 °C	12.9 °C	16.4 °C	31.4 °C	0.9 °C	10	0
August	23.8 °C	14.3 °C	18.5 °C	35.8 °C	1.7 °C	14	5
September	25.9 °C	16.1 °C	20.5 °C	39.0 °C	4.9 °C	16	8
October	28.1 °C	19.0 °C	23.1 °C	40.7 °C	8.1 °C	23	10
November	29.4 °C	20.2 °C	24.5 °C	38.5 °C	9.5 °C	27	12
December	31.3 °C	22.4 °C	26.7 °C	38.9 °C	12.5 °C	31	21

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	121 mm	11	14 h/day	49 %	69 %	17 km/h
February	144 mm	12	13 h/day	49 %	72 %	17 km/h
March	136 mm	11	12 h/day	46 %	73 %	16 km/h
April	156 mm	10	11 h/day	47 %	76 %	17 km/h
May	125 mm	8	11 h/day	52 %	78 %	17 km/h
June	99 mm	8	11 h/day	54 %	79 %	18 km/h
July	80 mm	7	11 h/day	46 %	75 %	19 km/h
August	64 mm	6	11 h/day	40 %	69 %	20 km/h
September	110 mm	8	12 h/day	43 %	68 %	21 km/h
October	185 mm	11	13 h/day	52 %	72 %	21 km/h
November	185 mm	10	13 h/day	47 %	70 %	19 km/h
December	164 mm	11	14 h/day	50 %	70 %	18 km/h

How Formosa 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
Formosa	32 °C	13 °C	1,569 mm	248
Asunción · Paraguay	32 °C	14 °C	1,577 mm	259
San Lorenzo · Paraguay	32 °C	14 °C	1,599 mm	259
Corrientes · Argentina	31 °C	12 °C	1,523 mm	219
Resistencia · Argentina	32 °C	12 °C	1,470 mm	221
Ituzaingó · Argentina	31 °C	12 °C	1,684 mm	221
Posadas · Argentina	31 °C	12 °C	1,721 mm	222

Where Formosa ranks

Ranking	Position	Value
The warmest places in South America in January	10th of 50	32 °C
The warmest places in South America in December	18th of 50	31 °C
The warmest places in South America in February	28th of 50	31 °C
Places with the best weather in South America in August	45th of 50	92/100

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

QuestionsCommon questions about Formosa’s climate

When is the best time to visit Formosa?

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

How hot does Formosa get?

In January, the warmest month, daily highs average 32 °C. About 127 days a year pass 30 °C. The highest value in the 1991–2020 record is 41 °C.

How cold does it get in winter?

Nights average 13 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Formosa?

November, averaging 185 mm over 10 days with rain. The driest month is August with 64 mm. The year as a whole averages 1,569 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 Formosa 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: -26.185°, -58.173° (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.