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Rosario Weather in September
Thinking of visiting Rosario in September? Expect pleasant temperatures reaching 20°C (68°F) during the day, dropping to 9°C (48°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Rosario in September
Typically around 8 days of rainfall are expected, averaging 87 mm (3.4 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Rosario in September
Rosario in September is worth a visit. The temperature is excellent, with 20°C (68°F) during the day and 9°C (48°F) at night. The difference between afternoon and evening temperatures is usually noticeable. At 9°C (48°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Rosario Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
20°C (68°F)
Chance of Rain
27%
Precipitation
87 mm (3.4 in)
Rainy days
8 days
Rosario Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rosario - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Rosario typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records 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
Based on weather observations in Rosario between 1981 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 10, 2013, with a maximum of 32°C (90°F).
- The coldest September day was on September 14, 1981, with a maximum of 8°C (46°F).
- The lowest overnight temperature recorded in September was 0°C (32°F) (September 22, 2020).
Best Places in Uruguay in September
Find out more about the weather in Uruguay and which places have the best travel conditions in this month. See all of Uruguay in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Rosario in September
For Rosario in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.
What To Do in Rosario in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping4/10 -
Outdoor sports9/10
Rosario 3-Day Forecast
More climate data for Rosario
See the full Rosario climate overview or explore weather in Uruguay.
Popular in September
Where to go in September - average daytime high across popular destinations.
Colonia del Sacramento
18°C (64°F) Montevideo18°C (64°F) La Pedrera17°C (63°F) José Ignacio
17°C (63°F) Piriápolis17°C (63°F) La Paloma16°C (61°F) Punta Del Diablo17°C (63°F) Punta del Este16°C (61°F) Bucket list
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