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Colonia Rosario Weather in September
During September, Colonia Rosario experiences pleasant daytime temperatures of 19°C (66°F) and cooler nights around 10°C (50°F). Expect quite a bit of rainfall. Around 87 mm (3.4 in) is typical.
Rainfall in Colonia Rosario in September
You can expect rain on roughly 8 days based on historical data, averaging 87 mm (3.4 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Colonia Rosario in September
Temperatures in Colonia Rosario in September top out at 19°C (66°F) and drop to 10°C (50°F) overnight. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 10°C (50°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.If you prefer enjoying temperate temperatures and rain-free days, December typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Colonia Rosario Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
19°C (66°F)
Chance of Rain
27%
Precipitation
87 mm (3.4 in)
Rainy days
8 days
Colonia Rosario Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Colonia Rosario - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Colonia Rosario typically stay consistent throughout September, with daily highs averaging around 19°C (66°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 Colonia Rosario in September
Browse day-by-day weather records for Colonia Rosario spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Colonia Rosario historical weather extremes in September
Based on weather observations in Colonia Rosario between 1981 and 2026, these are the recorded extremes during September.
- The hottest September day on record in Colonia Rosario reached 32°C (90°F) (September 10, 2013).
- On September 14, 1981, Colonia Rosario saw its coldest September day with temperatures maxing out at 8°C (46°F).
- The coldest night in September in Colonia Rosario was on September 22, 2020, with a minimum of 0°C (32°F).
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 Colonia Rosario in September
For Colonia 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 Colonia 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
Colonia Rosario 3-Day Forecast
More climate data for Colonia Rosario
See the full Colonia 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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