September in Puerto Iguazú sees daytime temperatures around 28°C (82°F) and lows of 16°C (61°F) at night. With around 164 mm (6.5 in) of rainfall expected, it's worth packing a rain jacket.
For Puerto Iguazú itself, August generally stands out with 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.
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Pick a month to see the average temperature, rainfall and sunshine in Puerto Iguazú - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Puerto Iguazú typically stay consistent throughout September, with daily highs averaging around 28°C (82°F). Nights are pleasant, with lows typically ranging from 13°C (55°F) to 16°C (61°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Puerto Iguazú spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Our historical data for Puerto Iguazú spans 1976 to 2026, revealing these weather extremes.
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 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).
Warm but pleasant conditions in Puerto Iguazú in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Puerto Iguazú climate overview or explore weather in Argentina.
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) Need travel inspiration? Check out our bucket list articles and be inspired.
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