Climate averages 1991–2020
Bahía Blanca weather
by month.
See how the year changes. January has the highest average daily maximum; June has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: FebruaryMarchAprilOctoberNovemberDecember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Bahía Blanca averages a daytime high of 21.0°C and a nighttime low of 11.8°C, with about 604 mm of rain on roughly 73 days. January is the warmest month (average high 29.7°C) and July the coolest (12.7°C). March is the wettest month with 67 mm; June is the driest with 28 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): February, March, April, October, November and December. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Bahía Blanca
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bahía Blanca climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.7°C18.7°C | 18.7°C | 54 | 7.1 | 14.515 h |
| February | 28.0°C17.7°C | 17.7°C | 65 | 6.7 | 13.614 h |
| March | 25.3°C16.0°C | 16.0°C | 67 | 6.7 | 12.412 h |
| April | 20.7°C12.2°C | 12.2°C | 55 | 6.0 | 11.111 h |
| May | 16.7°C9.2°C | 9.2°C | 38 | 5.4 | 10.110 h |
| June | 13.4°C6.2°C | 6.2°C | 28 | 4.4 | 9.510 h |
| July | 12.7°C5.0°C | 5.0°C | 34 | 5.0 | 9.710 h |
| August | 15.1°C6.4°C | 6.4°C | 35 | 4.7 | 10.611 h |
| September | 17.6°C8.0°C | 8.0°C | 45 | 6.2 | 11.812 h |
| October | 20.6°C10.9°C | 10.9°C | 64 | 7.7 | 13.113 h |
| November | 24.5°C14.0°C | 14.0°C | 63 | 7.0 | 14.214 h |
| December | 28.0°C16.9°C | 16.9°C | 57 | 6.2 | 14.815 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- OlavarríaArgentina · 265 kmHigh 20.0°C · Low 10.0°C · 836 mm rain a year
- Santa Rosa, ArgentinaArgentina · 294 kmHigh 21.7°C · Low 11.6°C · 699 mm rain a year
- NecocheaArgentina · 307 kmHigh 18.1°C · Low 11.6°C · 792 mm rain a year
- TandilArgentina · 315 kmHigh 19.3°C · Low 9.4°C · 793 mm rain a year
- Mar del PlataArgentina · 418 kmHigh 18.4°C · Low 11.3°C · 811 mm rain a year
- General RocaArgentina · 462 kmHigh 22.0°C · Low 10.7°C · 268 mm rain a year
- JunínArgentina · 473 kmHigh 21.9°C · Low 12.2°C · 976 mm rain a year
- CipollettiArgentina · 496 kmHigh 21.9°C · Low 10.4°C · 228 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -38.70°, -62.30° (4 km from the city centre). Rain comes from the 0.25° cell at -38.75°, -62.25°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.