Rosario Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rosario.
Climate overview of Rosario
Rosario is located in southeastern Argentina, in the province of Santa Fe, on the Paraná River. It is one of Argentina's largest cities and sits on the pampa, a vast, flat grassland covering nearly 800,000 km² (about 309,000 square miles) across Uruguay, southern Brazil, and Argentina.
Rosario lies in a temperate climate zone, with its location on the pampa having a significant influence on its weather. The region is characterized by a pampa climate, featuring short winters that can range from cold to mild. Most rainfall occurs during the summer months, and with temperatures often exceeding 30°C (86°F) at the height of summer, humidity levels can feel quite high. Snow is extremely rare, having occurred only twice in the entire last century.
At the end of summer, the Paraná River occasionally overflows its banks, flooding the lower parts of the city.
Rosario Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rosario - and find the best time to visit.
Monthly Temperature in Rosario
Depending on the time of the year, temperatures range from very warm to moderate in Rosario. Average maximum daytime temperatures range from a very warm 31°C (88°F) in January, the warmest time of the year, to a moderate 17°C (63°F) during cooler months like July.
At night, you can expect temperatures ranging from 19°C (66°F) in January to around 6°C (43°F) during July.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Rosario
Rosario has a relatively rainy climate with high precipitation levels, averaging 1082 mm (43 in) of rainfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, March it receives high rainfall, averaging 130 mm (5.1 in) of precipitation, recorded across 9 rainy days. In contrast, the driest month July brings less rainfall, with 37 mm (1.5 in) over 5 rainy days. For more details, please visit our Rosario Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Rosario
Seasonal changes in sunshine hours are quite dramatic in Rosario. While January receives considerable daily sunshine with up to 9.8 hours, June marks the darkest time of the year, where sunshine is scarce with only 4.7 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Rosario by Month
The relative humidity is high throughout the year in Rosario.
The city experiences its highest humidity in May, reaching 82%. In December, the humidity drops to its lowest level at 68%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Rosario
The mean wind speed over the year ranges from 3 m/s (6 knots) in February, March, April, May and June to 5 m/s (10 knots) in September and October. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Rosario
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, August and September
- Warmest weather: January, February and December
- Most sunshine: January
- Fewer rainy days: May, June, July, August and September
- Seasonal pattern: Very warm summers and mild winters
Frequently asked questions about the climate in Rosario
What is the best time to visit Rosario?
May, August and September typically offer the most optimal weather in Rosario. In contrast, January, February and December tend to have less optimal conditions. Rosario has very warm summers and mild winters.
What temperatures can I expect in Rosario?
Daytime highs range from 17°C (63°F) in July to 31°C (88°F) in January. Nighttime lows range from 6°C (43°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Rosario get?
Annual rainfall is around 1082 mm (43 in). March is the wettest month with 130 mm (5.1 in), while July is the driest with 37 mm (1.5 in).
How sunny is Rosario?
Rosario receives around 2,558 hours of sunshine per year. January is the sunniest month with 294 hours, while June is the cloudiest with just 142 hours. Overall, Rosario enjoys abundant sunshine.
Rosario 3-Day Forecast
Rosario on the map
Rosario is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
Córdoba
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18°C (64°F) Mar del Plata15°C (59°F) San Carlos de Bariloche
6°C (43°F) San Martín de los Andes6°C (43°F) 
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