September · Argentina
Best time to visit Iguazu Falls in September Weather, crowds & prices
Weather in Iguazu Falls in September
Average temperature 22°C, 135 mm of rain, about 25 days with 6+ hours of sunshine and 72% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.1/10
Ranked #3 of 12 months
- Avg temp
- 22°C
- Rainfall
- 135 mm
- Humidity
- 72%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Iguazu Falls scores 8.1/10 for nature and wildlife travel - one of the top 12-month picks (#3). Expect around 22°C, 135 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Iguazú Falls spans the Argentina-Brazil border, with walkways above and below the river's main cascades.
September in Iguazu Falls — reliably good (3rd best month)
September averages 22°C (71°F) — warm for the outdoors: start trails early, use shaded routes at midday, and carry more water than you think you need.
Monthly rainfall reaches 135 mm — wet for this destination — but about 25 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 8.1/10 here, 3rd of 12 months, against 8.7/10 in the destination's best month.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella, footwear you can get muddy.
Plan for mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Iguazu Falls in September?
- In September, Iguazu Falls averages 22°C, 135 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 8.1/10.
- Is September a good time to visit Iguazu Falls?
- September earns a 8.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Iguazu Falls in September?
- Expect about 135 mm of rain in September. Average humidity is 72% and there are about 25 days with 6+ hours of sunshine.
Curated in Iguazu Falls
Tickets & experiences
Things to do in Iguazu Falls
Iguazu Falls, Argentina. Live activities and tours from GetYourGuide, matched to this destination.