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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 32°C, while the coldest is July averaging around 2°C at night. Precipitation totals about 818 mm a year and is strongly seasonal — December alone averages 122 mm while August barely receives 14 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsBahía Blanca climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 30 | 27 | 22 | 18 | 15 | 14 | 17 | 19 | 23 | 27 | 30 |
| Avg temp (°C) | 24 | 23 | 21 | 16 | 12 | 9 | 8 | 11 | 12 | 16 | 19 | 22 |
| Avg low (°C) | 16 | 15 | 13 | 9 | 6 | 3 | 2 | 4 | 5 | 9 | 12 | 15 |
| Precipitation (mm) | 53 | 93 | 65 | 94 | 74 | 46 | 64 | 14 | 37 | 98 | 57 | 122 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 30 | 27 | 22 | 18 | 15 |
| Avg temp (°C) | 24 | 23 | 21 | 16 | 12 | 9 |
| Avg low (°C) | 16 | 15 | 13 | 9 | 6 | 3 |
| Precipitation (mm) | 53 | 93 | 65 | 94 | 74 | 46 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 19 | 23 | 27 | 30 |
| Avg temp (°C) | 8 | 11 | 12 | 16 | 19 | 22 |
| Avg low (°C) | 2 | 4 | 5 | 9 | 12 | 15 |
| Precipitation (mm) | 64 | 14 | 37 | 98 | 57 | 122 |
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 ≥ 32°C (days) | 12 | 8 | 4 | 0.2 | — | — | — | 0.1 | — | 0.4 | 2 | 8 |
| Days with low ≤ 0°C (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 ≥ 32°C (days) | 12 | 8 | 4 | 0.2 | — | — |
| Days with low ≤ 0°C (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 ≥ 32°C (days) | — | 0.1 | — | 0.4 | 2 | 8 |
| Days with low ≤ 0°C (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 (km/h) | 14.2 | 13.5 | 12.7 | 11.8 | 11.3 | 12.3 | 12.5 | 12.5 | 12.1 | 12.1 | 12.9 | 14.0 |
| 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 (km/h) | 14.2 | 13.5 | 12.7 | 11.8 | 11.3 | 12.3 |
| 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 (km/h) | 12.5 | 12.5 | 12.1 | 12.1 | 12.9 | 14.0 |
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.