Rosario Weather in January

Rosario in January sees very high daytime temperatures of 31°C (88°F) and nighttime lows of 19°C (66°F). Rainfall is fairly high this month at around 107 mm (4.2 in), so pack a rain jacket to stay dry.

Rainfall in Rosario in January

This month experiences about 9 days of rain according to historical data, averaging 107 mm (4.2 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Rosario in January

In January, expect very high temperatures in Rosario, with highs of 31°C (88°F) and lows of 19°C (66°F) at night. Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. Bear in mind, these are average temperatures, and it can get even warmer on particular days. Make sure to choose clothing that accommodates the warmth.

Sunshine in Rosario in January

With approximately 294 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Wind Speed in Rosario in January

January sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

If you're looking for dry conditions and comfortable temperatures, January may not be the ideal month to visit Rosario. Our weather planner can help you explore destinations with more pleasant weather conditions.

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Check the conditions for any month of the year.

• January
• February
• March
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• May
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• September
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For a detailed overview over the year and the best time to visit Argentina, check out our Rosario's climate page.

Rosario Temperature in January

Min Temperature 19°C (66°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 28%  

Precipitation 107 mm (4.2 in)  

Rainy days 9 days  

Humidity 69%  

Windspeed 4 m/s (8 knots)  

Sunshine 294 hours  

Percentage Sunshine 72%  

Daily Historical Temperatures

51-year average (1976-2026)

Based on our historical records, temperatures in Rosario typically stay consistent throughout January, with daily highs averaging around 31°C (88°F). Nights are pleasant, with lows around 19°C (66°F).

Average temperatures in January

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Daily Historical Precipitation

51-year average (1976-2026)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in January

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Historical weather for Rosario in January

Browse day-by-day weather records for Rosario spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Rosario historical weather extremes in January

Based on weather observations in Rosario between 1976 and 2025, these are the recorded extremes during January.

• The hottest January day on record in Rosario reached 40°C (104°F) (January 9, 2006).
• On January 31, 2005, Rosario saw its coldest January day with temperatures maxing out at 18°C (64°F).
• Rosario registered its coldest January night on January 18, 1990, with temperatures dropping to 9°C (48°F).

What to Wear in Rosario in January

Warm weather calls for comfortable, breathable clothing in January. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Rosario in January

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Argentina, check out our Rosario's climate page.

More climate data for Rosario

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Rosario climate overview or explore weather in Argentina.