Rosario Weather in September
With daytime temperatures of 22°C (72°F) and nighttime lows of 10°C (50°F), September in Rosario brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 64 mm (2.5 in) falls on average.
Rainfall in Rosario in September
Typically, you can expect about 6 days of rain this month, with 64 mm (2.5 in) on average. Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.
Temperature in Rosario in September
Rosario in September has perfect weather. Days reach 22°C (72°F) and nights cool to 10°C (50°F). This kind of day-to-night contrast is typical for this time of year. With overnight lows of 10°C (50°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Rosario in September
There are approximately 199 hours of sunshine this month, resulting in mostly clear days.
Wind Speed in Rosario in September
September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, August and September typically offer the best weather for Rosario.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our Rosario's climate page.
Rosario Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
22°C (72°F)
Chance of Rain
19%
Precipitation
64 mm (2.5 in)
Rainy days
6 days
Humidity
74%
Windspeed
5 m/s (10 knots)
Sunshine
199 hours
Percentage Sunshine
56%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rosario typically rise from around 19°C (66°F) at the start of September to approximately 22°C (72°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Rosario in September
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.
Rosario historical weather extremes in September
The extremes listed below come from historical weather data collected in Rosario from 1976 through 2025.
- On September 10, 2013, temperatures climbed to 37°C (99°F), marking the warmest September day on record.
- On September 1, 2020, Rosario saw its coldest September day with temperatures maxing out at 9°C (48°F).
- The lowest overnight temperature recorded in September was -5°C (23°F) (September 8, 1983).
Best Places in Argentina in September
Find out more about the weather in Argentina and which places have the best travel conditions in this month. See all of Argentina in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Rosario in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. 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 September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our Rosario's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rosario climate overview or explore weather in Argentina.
