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Bahía Blanca, Argentina climate

Cfa Humid subtropical

Bahía Blanca has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is January with an average daily high near 89°F, while the coldest is July averaging around 35°F at night. Precipitation totals about 32 inches a year and is strongly seasonal — December alone averages 4.8 inches while August barely receives 0.55 inches.

☀️ Summers

Hot

Highs near 89°F in January.

About 35 days a year above 90 °F

❄️ Winters

Chilly

Lows near 35°F in July.

About 31 freezing nights a year

🌧️ Rain

Moderate rainfall

About 32 in of rain a year.

Wettest in December

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+1.2 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Bahía Blanca climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	89	86	81	72	65	59	58	62	67	73	80	86
Avg temp (°F)	75	73	69	61	54	48	47	51	54	61	67	72
Avg low (°F)	61	59	56	48	43	38	35	39	42	47	53	58
Precipitation (in)	2.1	3.7	2.6	3.7	2.9	1.8	2.5	0.6	1.5	3.9	2.2	4.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	89	86	81	72	65	59
Avg temp (°F)	75	73	69	61	54	48
Avg low (°F)	61	59	56	48	43	38
Precipitation (in)	2.1	3.7	2.6	3.7	2.9	1.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	58	62	67	73	80	86
Avg temp (°F)	47	51	54	61	67	72
Avg low (°F)	35	39	42	47	53	58
Precipitation (in)	2.5	0.6	1.5	3.9	2.2	4.8

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	6	5	5	6	4	5	4	4	4	7	6	5
Days with high ≥ 90°F (days)	12	8	4	0.2	—	—	—	0.1	—	0.4	2	8
Days with low ≤ 32°F (days)	0.0	—	—	0.5	3	7	10	7	4	0.8	0.1	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	6	5	5	6	4	5
Days with high ≥ 90°F (days)	12	8	4	0.2	—	—
Days with low ≤ 32°F (days)	0.0	—	—	0.5	3	7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	4	7	6	5
Days with high ≥ 90°F (days)	—	0.1	—	0.4	2	8
Days with low ≤ 32°F (days)	10	7	4	0.8	0.1	—

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	44	43	45	50	58	58	57	57	56	55	51	46
Clear days (≤ 30% cloud)	12	11	12	10	8	8	7	8	8	8	9	11
Partly cloudy days (30–70%)	12	10	11	10	9	10	11	10	11	11	12	12
Cloudy days (≥ 70%)	7	7	8	10	14	13	13	13	12	12	9	8
Relative humidity (%)	48	53	60	67	76	77	77	71	67	63	55	49
Wind speed (mph)	8.8	8.4	7.9	7.3	7.0	7.7	7.8	7.8	7.5	7.5	8.0	8.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	44	43	45	50	58	58
Clear days (≤ 30% cloud)	12	11	12	10	8	8
Partly cloudy days (30–70%)	12	10	11	10	9	10
Cloudy days (≥ 70%)	7	7	8	10	14	13
Relative humidity (%)	48	53	60	67	76	77
Wind speed (mph)	8.8	8.4	7.9	7.3	7.0	7.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	57	56	55	51	46
Clear days (≤ 30% cloud)	7	8	8	8	9	11
Partly cloudy days (30–70%)	11	10	11	11	12	12
Cloudy days (≥ 70%)	13	13	12	12	9	8
Relative humidity (%)	77	71	67	63	55	49
Wind speed (mph)	7.8	7.8	7.5	7.5	8.0	8.7

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Bahia Blanca Aero, a weather station, about 9 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →