The hottest month in Rosario is typically January, with daytime highs averaging around 30.8°C (87°F), based on 10 years of historical weather data. Overnight lows during this period average near 20.8°C (69°F).

What is the coldest month in Rosario?

The coldest month in Rosario is typically July, with overnight lows averaging around 7.3°C (45°F) and daytime highs near 15.9°C (61°F), based on 10 years of historical weather data.

Does Rosario have a rainy season?

Rosario doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. April is the wettest month on average (about 137 mm), while June is the driest (about 22 mm).

What's the best time of year to visit Rosario?

The best time to visit Rosario is typically September to October, when daytime highs average a comfortable 22.7°C (73°F). Rainfall during this window averages around 70 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Atmospheric Details

Wind

11 km/h

SSE · Light Breeze · Max 17 km/h

Humidity

67 %

Comfortable

UV Index

High

Visibility

10 km

Excellent

Pressure

1008 hPa

Stable

Dew Point

9°C

Comfortable

Today vs Normal

20°C-2° below normal

The long-term average high for today is 22°C.

6 of the last 19 days with published data ran above normal.

It continues that pattern - today's forecast is also running below normal.

Red = above normal, blue = at or below · last 12 days

Air Quality

Good

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Health & Activity Advice

✅ Good for Outdoors

UV index is 6 today — moderate. Sunscreen is worth using for extended time outside, but no special precautions are needed for short trips.

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Conditions are comfortable for outdoor activity at most points during the day today.