Rosario Temperature by Month

Rosario, Santa Fe Province, Argentina has an average annual maximum temperature of 25°C (77°F), ranging from 17°C (63°F) in July to 31°C (88°F) in January. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The climate in Rosario is dynamic, ranging widely from moderate in winter to very warm in summer. Nights are significantly colder, with lows dropping from 19°C (66°F) in January to 6°C (43°F) in July.

The chart below illustrates the average maximum day and minimum night temperatures in Rosario by month:

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. January, the city's warmest month, averages 294 hours of sunshine.

The chart below shows the average temperature throughout the year:

Rosario's average annual maximum temperature is 25°C (77°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Rosario, July is the coolest month, with average highs of 17°C (63°F) and humidity around 82%, considered very high. In January, the warmest month, temperatures average 31°C (88°F) with 69% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Rosario's weather, including monthly rainfall, sunshine hours, and humidity, visit our Rosario climate page.