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Gualeguaychú Weather in September
September in Gualeguaychú typically sees daytime highs of 21°C (70°F) and nighttime lows of 10°C (50°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Gualeguaychú in September
You can typically expect 7 days of rain this month, averaging around 92 mm (3.6 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Gualeguaychú in September
September is one of the better months to visit Gualeguaychú. Expect 21°C (70°F) during the day and 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to 10°C (50°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Gualeguaychú in September
Expect a lot of sunshine this month, with about 194 hours of sun. These sunny conditions add to the overall experience.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 Gualeguaychú.
Gualeguaychú Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
21°C (70°F)
Chance of Rain
24%
Precipitation
92 mm (3.6 in)
Rainy days
7 days
Humidity
72% *
Sunshine
194 hours *
Percentage Sunshine
*
* Data from: Mercedes, Uruguay (49 KM, 30 Miles).
Gualeguaychú Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gualeguaychú - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gualeguaychú 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 8°C (46°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 records for Gualeguaychú in September
Browse day-by-day weather records for Gualeguaychú spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gualeguaychú historical weather extremes in September
According to our 50 years of weather records for Gualeguaychú, the following extremes were recorded between 1976 and 2026.
- On September 11, 2013, temperatures climbed to 37°C (99°F), marking the warmest September day on record.
- Gualeguaychú experienced its chilliest September day on September 14, 1981, reaching only 7°C (45°F).
- The coldest night in September in Gualeguaychú was on September 20, 2020, with a minimum of -2°C (28°F).
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
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 Gualeguaychú 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. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Gualeguaychú in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping4/10 -
Outdoor sports9/10
Gualeguaychú 3-Day Forecast
More climate data for Gualeguaychú
Temperature Rainfall Sunshine Humidity
See the full Gualeguaychú climate overview or explore weather in Argentina.
Popular in September
Where to go in September - average daytime high across popular destinations.
Córdoba
23°C (73°F) Salta21°C (70°F) Mendoza20°C (68°F) Buenos Aires
20°C (68°F) Mar del Plata16°C (61°F) San Martín de los Andes
8°C (46°F) San Carlos de Bariloche8°C (46°F) Bucket list
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