Weather in Foz this week (12/09 to 18/09): rain on 2 days, low 9°C

Day-by-day forecast for visitors to the Falls, Itaipu and the border — updated throughout the week as the outlook changes

The week in Foz do Iguaçu ranges from 9°C (Wednesday) to 26°C (Thursday). Rain is expected on Saturday and Sunday. See the day-by-day details below — this article is revised during the week whenever the forecast changes.

Day by day

day	weather	min–max	rain
Saturday 12/09	showers	16–24°C	63%
Sunday 13/09	drizzle	14–21°C	59%
Monday 14/09	cloudy	12–23°C	2%
Tuesday 15/09	clear sky	11–22°C	0%
Wednesday 16/09	clear sky	9–23°C	0%
Thursday 17/09	cloudy	11–26°C	3%
Friday 18/09	showers	17–23°C	38%

What this means for the tour

On rainy days, the Falls remain impressive (bring a light raincoat) and Itaipu is barely affected — most tours are covered. A low of 9°C calls for a real coat, especially early morning and at night. The likelihood of full capacity per attraction is in Will it be crowded? and the live bridge queue in Bridge queue.

Weekly updates

06/09 — Friday (11/09): high changed from 31°C to 23°C.
06/09 — Sunday (13/09) now has a high chance of rain (52%).
08/09 — The rain on Saturday (12/09) was removed from the scenario (now 35%).
08/09 — The rain on Sunday (13/09) was removed from the scenario (now 49%).
10/09 — Friday (11/09): high changed from 24°C to 31°C.
10/09 — Saturday (12/09) now has a high chance of rain (57%).
10/09 — Sunday (13/09) now has a high chance of rain (59%).
11/09 — Friday (11/09): high changed from 31°C to 26°C.
11/09 — The rain on Saturday (12/09) was removed from the scenario (now 49%).
11/09 — Tuesday (15/09): high changed from 24°C to 21°C.
11/09 — Wednesday (16/09): high changed from 25°C to 22°C.
12/09 — Saturday (12/09) now has a high chance of rain (63%).

Source and method

Numbers: Open-Meteo (hourly model for Foz do Iguaçu, CC BY 4.0). Official INMET bulletin collected on 2026-09-11 matches the scenario (see official block at /previsao). This article is generated and automatically revised by Marco Três from the data — no speculation; when the forecast changes, the text changes and the alteration is recorded above. Full 14-day forecast at /previsao.