Rosario climate
Rosario is warmest in January, with average highs of 30 °C, and coldest in July, when nights average 7.1 °C. March is the wettest month (125 mm) and July the driest (36 mm). Figures are 1991–2020 climate normals.
Across a full year Rosario averages 1,041 mm of rain, 148 days above 25 °C and 1 days below freezing.
Argentina · population 948,312 · 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 7.1 °C
- Driest month July 36 mm
- Wettest month March 125 mm
- Least cloud January 38 % cloud
- Hottest on record January 39 °C
- Coldest on record July -2.5 °C
What to expectRosario through the year
Rosario has a clear annual cycle: average daily highs run from 15 °C in July to 30 °C in January, a swing of 14 °C in mean temperature across the year.
Counted across a normal year, 148 days a year reach 25 °C, 49 of them reach 30 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 39 °C, in January.
Rain is strongly seasonal. March averages 125 mm against 36 mm in July — 3.4 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 30.1 °C | 103 mm | 38 % |
| February | 28.5 °C | 111 mm | 41 % |
| March | 26.6 °C | 125 mm | 40 % |
| April | 22.7 °C | 104 mm | 45 % |
| May | 18.9 °C | 69 mm | 55 % |
| June | 16.1 °C | 40 mm | 54 % |
| July | 15.5 °C | 36 mm | 49 % |
| August | 18.2 °C | 55 mm | 43 % |
| September | 20.5 °C | 63 mm | 44 % |
| October | 23.3 °C | 115 mm | 49 % |
| November | 26.3 °C | 113 mm | 42 % |
| December | 28.8 °C | 106 mm | 41 % |
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 | 30.1 °C | 20.2 °C | 25.1 °C | 39.0 °C | 11.9 °C | 29 | 16 | 0 |
| February | 28.5 °C | 19.3 °C | 23.8 °C | 36.4 °C | 10.6 °C | 24 | 9 | 0 |
| March | 26.6 °C | 17.6 °C | 21.9 °C | 35.4 °C | 8.3 °C | 21 | 5 | 0 |
| April | 22.7 °C | 14.3 °C | 18.2 °C | 32.6 °C | 4.7 °C | 8 | 1 | 0 |
| May | 18.9 °C | 11.3 °C | 14.8 °C | 30.3 °C | 0.4 °C | 2 | 0 | 0 |
| June | 16.1 °C | 8.3 °C | 11.8 °C | 26.2 °C | -0.9 °C | 0 | 0 | 0 |
| July | 15.5 °C | 7.1 °C | 10.8 °C | 27.7 °C | -2.5 °C | 0 | 0 | 1 |
| August | 18.2 °C | 8.3 °C | 12.8 °C | 33.7 °C | -2.4 °C | 3 | 0 | 0 |
| September | 20.5 °C | 10.2 °C | 15.0 °C | 35.1 °C | 0.7 °C | 4 | 1 | 0 |
| October | 23.3 °C | 13.3 °C | 18.0 °C | 36.2 °C | 3.2 °C | 10 | 1 | 0 |
| November | 26.3 °C | 15.9 °C | 21.1 °C | 36.7 °C | 5.5 °C | 19 | 5 | 0 |
| December | 28.8 °C | 18.5 °C | 23.6 °C | 38.6 °C | 8.4 °C | 27 | 11 | 0 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 103 mm | 8 | 14 h/day | 38 % | 65 % | 16 km/h |
| February | 111 mm | 8 | 13 h/day | 41 % | 70 % | 15 km/h |
| March | 125 mm | 8 | 12 h/day | 40 % | 72 % | 15 km/h |
| April | 104 mm | 8 | 11 h/day | 45 % | 75 % | 16 km/h |
| May | 69 mm | 6 | 10 h/day | 55 % | 78 % | 16 km/h |
| June | 40 mm | 5 | 10.0 h/day | 54 % | 79 % | 16 km/h |
| July | 36 mm | 5 | 10 h/day | 49 % | 77 % | 17 km/h |
| August | 55 mm | 5 | 11 h/day | 43 % | 72 % | 17 km/h |
| September | 63 mm | 6 | 12 h/day | 44 % | 68 % | 18 km/h |
| October | 115 mm | 10 | 13 h/day | 49 % | 69 % | 18 km/h |
| November | 113 mm | 8 | 14 h/day | 42 % | 65 % | 18 km/h |
| December | 106 mm | 9 | 14 h/day | 41 % | 64 % | 17 km/h |
Where Rosario ranks
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in South America in April | 19th of 50 | 91/100 |
| Places with the best weather in South America in September | 21st of 50 | 92/100 |
| Places with the best weather in South America in October | 30th of 50 | 88/100 |
| Places with the best weather in South America year-round | 30th of 50 | 83/100 |
| The coolest places in South America in July | 30th of 50 | 15 °C |
| The coolest places in South America in June | 30th of 50 | 16 °C |
Planning a trip? See the best time to visit Rosario.
QuestionsCommon questions about Rosario’s climate
When is the best time to visit Rosario?
That depends on what you want, so the honest answer is a comparison rather than a single month. March, April, November sit closest to 20 °C on average, January is the warmest month and July the driest. The month-by-month table above has the full picture.
How hot does Rosario get?
In January, the warmest month, daily highs average 30 °C. About 49 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.
How cold does it get in winter?
Nights average 7.1 °C in July, the coldest month. A normal year has 1 nights below freezing.
Which month is wettest in Rosario?
March, averaging 125 mm over 8 days with rain. The driest month is July with 36 mm. The year as a whole averages 1,041 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 Rosario 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
- -32.947°, -60.639° (the coordinates the reanalysis values are taken for)
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
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.