Climate averages 1991–2020
Santa Rosa, Argentina 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: FebruaryMarchAprilSeptemberNovember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Santa Rosa, Argentina averages a daytime high of 21.7°C and a nighttime low of 11.6°C, with about 699 mm of rain on roughly 79 days. January is the warmest month (average high 30.1°C) and July the coolest (13.3°C). March is the wettest month with 86 mm; June is the driest with 16 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, September and November. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Santa Rosa
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
Santa Rosa, Argentina climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.1°C19.0°C | 19.0°C | 82 | 9.0 | 14.314 h |
| February | 28.3°C17.7°C | 17.7°C | 81 | 7.9 | 13.513 h |
| March | 25.6°C15.8°C | 15.8°C | 86 | 8.0 | 12.312 h |
| April | 21.0°C11.8°C | 11.8°C | 67 | 6.3 | 11.211 h |
| May | 17.0°C8.6°C | 8.6°C | 30 | 5.0 | 10.210 h |
| June | 13.9°C5.1°C | 5.1°C | 16 | 3.3 | 9.710 h |
| July | 13.3°C4.1°C | 4.1°C | 19 | 3.7 | 9.910 h |
| August | 16.2°C5.7°C | 5.7°C | 27 | 4.0 | 10.711 h |
| September | 18.9°C8.0°C | 8.0°C | 48 | 5.8 | 11.812 h |
| October | 21.9°C11.2°C | 11.2°C | 82 | 9.6 | 13.013 h |
| November | 25.7°C14.5°C | 14.5°C | 74 | 8.0 | 14.014 h |
| December | 28.9°C17.5°C | 17.5°C | 85 | 8.5 | 14.615 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
- Bahía BlancaArgentina · 294 kmHigh 21.0°C · Low 11.8°C · 604 mm rain a year
- Villa Mercedes, ArgentinaArgentina · 344 kmHigh 22.8°C · Low 12.0°C · 691 mm rain a year
- OlavarríaArgentina · 355 kmHigh 20.0°C · Low 10.0°C · 836 mm rain a year
- JunínArgentina · 377 kmHigh 21.9°C · Low 12.2°C · 976 mm rain a year
- Venado TuertoArgentina · 383 kmHigh 22.4°C · Low 12.8°C · 958 mm rain a year
- Río CuartoArgentina · 388 kmHigh 22.3°C · Low 12.3°C · 738 mm rain a year
- General RocaArgentina · 395 kmHigh 22.0°C · Low 10.7°C · 268 mm rain a year
- San LuisArgentina · 414 kmHigh 23.0°C · Low 12.4°C · 665 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 -36.60°, -64.30° (2 km from the city centre), adjusted up by 0.2°C for the difference between the city's elevation (163 m) and the cell's (191 m). Rain comes from the 0.25° cell at -36.50°, -64.25°. 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.