Are Iguazu Falls open today?

Direct answer: Yes. Iguaçu National Park (Brazilian side) and Iguazú National Park (Argentine side) open every day of the year, including public holidays and in the rain. What closes is a section, not the park, and always because of river flow. Two dated caveats apply right now: the Argentine Devil's Throat has been closed since 3 August 2026, and the river is running above average, with no closure on the Brazilian side.

Opening hours on both sides

On the Argentine side the last ecological train towards the Throat leaves around 15:30. More on crowd flow in what time to go to avoid queues.

What can actually close

Not the park, the section. And the reason is almost always the same: the flow of the Iguaçu river.

• Brazilian side: walkway closure usually happens when flow approaches 9 million litres per second (9,000 m³/s). The historical average is 1.5 million L/s, so that is six times normal. In extreme floods, such as the 24,000 m³/s of October 2023, closures go further.
• Argentine side: the Devil's Throat has been closed since 3 August 2026. The walkways were dismantled as a precaution against flooding, and they only go back once measurements say it is safe. The rest of the park (Upper and Lower circuits, trails, train) keeps running. Detail in Devil's Throat closed.

Right now: above-average river, no closures

We measure the Iguaçu river straight from the National Water Agency (ANA) gauge next to Hotel Cataratas, inside the park. On 29 September 2026 at 14:00 the reading was 3,750 m³/s, about 3.75 million litres per second, and rising again after last week's drop. This month's flood peaked on 11 September at 8,936 m³/s, when the walkway was closed; since it reopened on 15 September the flow has eased and stays well below the closure threshold.

That means three things for your visit:

1. Flow is still above normal, but far below the peak. The latest reading is about 2.5 times the historical average, against 6 times on 11 September.
2. No closure risk at this level. The Brazilian threshold sits near 9,000 m³/s, about 2.4 times the latest reading.
3. Check on the day itself. The live measurement is at how the Falls are today.

The brown water on days like these is not dirt: it is sediment washed in by rain across the basin. And the flood has nothing to do with Itaipu, which sits on the Paraná river and does not control the Iguaçu.

Rain closes nothing

This is the most common misunderstanding. Rain does not close the park on either side. What changes is comfort: slippery decking, thicker spray and less distant visibility. A poncho works better than an umbrella, because it frees your hands on wet walkways.

Before you set out

• Brazilian side ticket: prices and exemptions in Iguazu Falls tickets.
• Argentine side ticket: fares by nationality and the 50% second-day discount in Iguazú National Park entrance.
• Which side to pick if you only have one day: the two sides compared.

Source: our own Iguaçu river measurement (ANA gauge, Hotel Cataratas, inside the national park), concessionaire Urbia+Cataratas (Brazilian side), Iguazú Argentina and the National Parks Administration (Argentine side).