Early spring · Weather & things to do
Iguazú in September
Iguazú warms up: highs climb to 81°F (27°C), from 76°F in August, with lows of 61°F (16°C) and about 4.8 in (121 mm) of rain.
At 81/100 for comfort (4th of 12), it's one of the best months to visit.
- Avg high
- 81°F (27°C)
- Avg low
- 61°F (16°C)
- Rain
- 4.8 in (121 mm)
- Humidity
- 71%
- Cloud cover
- 53%
- Daylight
- ~11 h 52 min
- Comfort score
- 81/100 · Great
What September feels like
Days are warm, averaging 81°F (27°C).
After dark, temperatures fall to about 61°F (16°C).
Expect regular rain: about 4.8 in (121 mm) falls in the month.
Plan around September
September is one of Iguazú's best months on the climate data.
- Last of the best-scoring months: by October, the score drops to 57/100.
- Comfort slips from 87/100 in August to 81/100.
- September sits inside the Mar – May, Sep – Nov window our Buenos Aires, Mendoza & Iguazú route recommends.
What to pack for September
- Light, breathable clothes81°F afternoons
- Rain jacket and waterproof shoes4.8 in of rain on average
- Comfortable walking shoesmost picks involve some walking
What to do in Iguazú in September
September is good outdoor weather here, so these picks lean toward the open air.
Garganta del Diablo
U-shaped chasm where half the river plunges 80 m, reached by train and a long catwalk.
Why now September scores 81/100 for comfort, good conditions for being outside.
Parque Nacional do Iguaçu
Brazilian side with a panoramic trail facing the main falls and a walkway into the spray.
Why now Highs near 81°F and 4.8 in of monthly rain make this an easy outdoor pick.
El Quincho del Tío Querido
Busy parrilla in Puerto Iguazú with grilled meats and live music most nights.
Parque das Aves
Bird park beside the Brazilian park entrance with walk-in aviaries of toucans and macaws.
Why now One to do outside while the weather is on your side.
Itaipu Dam
Huge hydroelectric dam on the Brazil–Paraguay border with panoramic and technical tours.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Iguazú in September: quick answers
Is September a good time to visit Iguazú?
Yes. On the climate data it's one of the best months, scoring 81/100. Expect highs of 81°F (27°C) and 4.8 in (121 mm) of rain. September is inside the Mar – May, Sep – Nov window our Buenos Aires, Mendoza & Iguazú route recommends.
How hot is Iguazú in September?
Average highs are 81°F (27°C) and average lows 61°F (16°C), making it the 5th-coldest month by daytime highs.
Does it rain a lot in Iguazú in September?
Yes: about 4.8 in (121 mm) of rain falls across September on average, the 5th-driest month of the year. The annual total is about 63.5 in (1613 mm).
What should I pack for Iguazú in September?
Bring light, breathable clothes (81°F afternoons), rain jacket and waterproof shoes (4.8 in of rain on average) and comfortable walking shoes (most picks involve some walking).
Routes in season in September
- Buenos Aires, Mendoza & Iguazú Mar – May, Sep – Nov
Planning Iguazú in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.