Bahía Blanca climate

Name: Bahía Blanca
Address: AR

Bahía Blanca is warmest in January, with average highs of 30 °C, and coldest in July, when nights average 5.1 °C. March is the wettest month (67 mm) and June the driest (26 mm). Figures are 1991–2020 climate normals.

Across a full year Bahía Blanca averages 606 mm of rain, 114 days above 25 °C and 4 days below freezing.

Argentina · population 299,101 · 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 30 °C
Coldest month July 5.1 °C
Driest month June 26 mm
Wettest month March 67 mm
Least cloud January 33 % cloud
Hottest on record January 40 °C
Coldest on record June -3.5 °C
Warmest sea January 22 °C

What to expectBahía Blanca through the year

Bahía Blanca has a clear annual cycle: average daily highs run from 13 °C in July to 30 °C in January, a swing of 16 °C in mean temperature across the year.

Counted across a normal year, 114 days a year reach 25 °C, 44 of them reach 30 °C, 4 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in January.

Rain is strongly seasonal. March averages 67 mm against 26 mm in June — 2.6 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Bahía Blanca is warmest in January at 22 °C and coldest in August at 8.6 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.9 °C	56 mm	33 %
February	28.1 °C	64 mm	34 %
March	25.4 °C	67 mm	37 %
April	20.7 °C	56 mm	45 %
May	16.7 °C	39 mm	54 %
June	13.4 °C	26 mm	53 %
July	12.8 °C	33 mm	53 %
August	15.2 °C	34 mm	51 %
September	17.7 °C	45 mm	50 %
October	20.7 °C	63 mm	48 %
November	24.5 °C	62 mm	41 %
December	28.2 °C	60 mm	35 %

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	29.9 °C	19.0 °C	24.1 °C	40.3 °C	9.8 °C	28	16	0
February	28.1 °C	17.9 °C	22.6 °C	38.1 °C	9.1 °C	21	10	0
March	25.4 °C	16.1 °C	20.3 °C	35.9 °C	6.5 °C	17	4	0
April	20.7 °C	12.3 °C	16.0 °C	32.2 °C	2.6 °C	4	0	0
May	16.7 °C	9.2 °C	12.5 °C	29.3 °C	-0.9 °C	1	0	0
June	13.4 °C	6.3 °C	9.4 °C	21.7 °C	-3.5 °C	0	0	1
July	12.8 °C	5.1 °C	8.4 °C	23.4 °C	-3.4 °C	0	0	2
August	15.2 °C	6.5 °C	10.3 °C	29.0 °C	-2.4 °C	0	0	1
September	17.7 °C	8.1 °C	12.5 °C	28.5 °C	-1.1 °C	1	0	0
October	20.7 °C	11.1 °C	15.6 °C	31.9 °C	0.9 °C	5	0	0
November	24.5 °C	14.3 °C	19.2 °C	35.2 °C	4.1 °C	14	3	0
December	28.2 °C	17.2 °C	22.4 °C	38.7 °C	7.2 °C	24	11	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	56 mm	7	15 h/day	33 %	50 %	28 km/h	22.4 °C
February	64 mm	7	14 h/day	34 %	56 %	27 km/h	22.0 °C
March	67 mm	6	12 h/day	37 %	61 %	25 km/h	20.5 °C
April	56 mm	6	11 h/day	45 %	65 %	25 km/h	16.9 °C
May	39 mm	6	10 h/day	54 %	70 %	24 km/h	13.5 °C
June	26 mm	4	9.5 h/day	53 %	70 %	25 km/h	10.5 °C
July	33 mm	5	9.7 h/day	53 %	69 %	25 km/h	8.7 °C
August	34 mm	5	11 h/day	51 %	64 %	26 km/h	8.6 °C
September	45 mm	6	12 h/day	50 %	61 %	25 km/h	10.8 °C
October	63 mm	8	13 h/day	48 %	60 %	26 km/h	14.6 °C
November	62 mm	7	14 h/day	41 %	54 %	27 km/h	18.1 °C
December	60 mm	6	15 h/day	35 %	49 %	29 km/h	20.8 °C

Where Bahía Blanca ranks

Ranking	Position	Value
The coolest places in South America in July	10th of 50	13 °C
The coolest places in South America in June	10th of 50	13 °C
The coolest places in South America in August	15th of 50	15 °C
The coolest places in South America in May	17th of 50	17 °C
The coolest places in the world in July	19th of 50	13 °C
Places with the best weather in South America in April	20th of 50	91/100

Planning a trip? See the best time to visit Bahía Blanca.

QuestionsCommon questions about Bahía Blanca’s climate

When is the best time to visit Bahía Blanca?

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

How hot does Bahía Blanca get?

In January, the warmest month, daily highs average 30 °C. About 44 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 5.1 °C in July, the coldest month. A normal year has 4 nights below freezing.

Which month is wettest in Bahía Blanca?

March, averaging 67 mm over 6 days with rain. The driest month is June with 26 mm. The year as a whole averages 606 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 Bahía Blanca 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: -38.718°, -62.265° (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.