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Foz Do Iguacu in September: Weather, Average temperature and Climate

Discover the weather for Foz Do Iguacu in September and if it’s a good time to travel (based on historical data).
Check flight prices to Foz Do Iguacu on Avionero:
September

Weather in Foz Do Iguacu in September 2025

Good Weather
Warm
☀️
Sunny
Weather for Foz Do Iguacu in September is typically good with an average maximum temperature of +81°F during the day, and approximately 12 sunny days monthly. Typically, there are about 11 rainy days with the total average precipitation that falls in September around 146 mm. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.
Good to know:
  • September is usually the driest month of the year in Foz Do Iguacu

Average weather

☀️
+81°F
Avg. max. temperature
+34°F
Min.
+104°F
Max.
146 mm
Total precipitation
74%
Avg. humidity
2 m/s
Avg. wind
12 ☀️
Sunny Days
5 ⛅️
Cloudy
11 🌦
Rainy
Our opinion: Foz Do Iguacu has good weather in September.

Average temperature in Foz Do Iguacu in September

Here are the expected maximum, average and minimum temperatures in Foz Do Iguacu for September based on the historical data.
Last Year
Historical Data

The expected average maximum temperature in September is +86°F with a maximum of +100°F and a minimum of +45°F.

The average maximum temperature goes up 19% by the end of the month, compared with the beginning of the month, from +75°F to +86°F.

Is Foz Do Iguacu warm or cold in September?

Foz Do Iguacu is typically warm in September.

Maximum temperatures go up compared to the previous month from +77°F to +81°F. The minimum temperature also goes up from +57°F to +61°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

Take a look at how September is compared to other months in Foz Do Iguacu:

Climate in Foz Do Iguacu in September

Foz Do Iguacu weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+77°F+81°F+84°F
Min. temperature
+30°F+34°F+41°F
Max. temperature
+99°F+104°F+104°F
Rainfall
99 mm146 mm194 mm
Wind
2 m/s2 m/s2 m/s
Humidity
75%74%76%
Air pressure
1016 HPa1014 HPa1011 HPa
Sunny days
15129
Cloudy days
654
Rainy days
91114
Snowy days
000

September weather is still as good as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +77°F to +81°F during the day. Prepare for more rain. Average rainfall goes from 99 mm to 146 mm. It feels drier, as humidity decreases from 75% to 74%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 15 sunny days in August to 12 in September.

Next month (October) brings a further decline in the weather.

Wind

Wind speed in Foz Do Iguacu in September based on historical data.
Last Year
Historical Data

The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.

The average wind speed in Foz Do Iguacu is gradually decreasing during September, going from 5 m/s to 1 m/s over the course of the month.

Rain

Amount of rainfall in mm during September in Foz Do Iguacu based on historical data.
Last Year
Historical Data
Total precipitation in September is about 104 mm, with a 33% chance of rain on a typical day. The maximum amount of rainfall per day is around 33 mm, which is moderate rain. September is a pretty wet month with over 10 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Foz Do Iguacu wettest month is October, where a typical day has a 45% chance of precipitation and 194 mm of rainfall per day. August, on the other hand, is the driest month with a mere 29% chance of precipitation and 99 mm of rainfall per day.

How was the weather last September in Foz Do Iguacu?

This is the weather in Foz Do Iguacu in September 2023:
1 September
☀️
+76°F
2 September
☀️
+72°F
3 September
☀️
+92°F
4 September
☁️
+89°F
5 September
☁️
+72°F
6 September
☀️
+85°F
7 September
☀️
+79°F
8 September
🌧️
+72°F
9 September
🌫️
+76°F
10 September
☀️
+87°F
11 September
☀️
+94°F
12 September
☀️
+94°F
13 September
☁️
+83°F
14 September
☁️
+69°F
15 September
☀️
+81°F
16 September
☀️
+89°F
17 September
☀️
+98°F
18 September
☀️
+92°F
19 September
☀️
+81°F
20 September
☀️
+96°F
21 September
☀️
+97°F
22 September
☀️
+99°F
23 September
☀️
+99°F
24 September
☀️
+101°F
25 September
☀️
+101°F
26 September
☀️
+101°F
27 September
🌧️
+80°F
28 September
☀️
+83°F
29 September
☀️
+76°F
30 September
☀️
+87°F
In September 2023 Foz Do Iguacu had 23 sunny days, 4 cloudy days, and 2 rainy days. The average maximum temperature was +86°F, with an absolute maximum of +100°F and a minimum of +68°F. The average humidity was 73%, with a maximum of 100% and a minimum of 34%. The average wind speed was 3 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change Over the Years

This is how Foz Do Iguacu climate has changed over the last 43 years.

The climate in Foz Do Iguacu in September has not changed that much over the last 43 years.

The average temperature was the lowest in 1983 (+79°F) and the highest in 2020 (+85°F). The driest year was 2021 with only 1098 mm of rainfall, and the wettest year was 1983 with 2760 mm.

FAQ

Frequently asked questions about the weather in Foz Do Iguacu in September:

Is September a good time to visit Foz Do Iguacu?

September is a really good time to go to Foz Do Iguacu. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Foz Do Iguacu.

Can you sunbathe in Foz Do Iguacu in September?

September is warm in Foz Do Iguacu. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.

Is Foz Do Iguacu rainy in September?

Foz Do Iguacu is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Foz Do Iguacu in September?

The amount of sunny days in Foz Do Iguacu during September varies; prepare for a mix of clouds and sun.

Other cities in Brazil

Check out the weather for other cities in Brazil.

Monthly weather in Foz Do Iguacu

Source of the data

For this page, we’ve looked at the typical weather in Foz Do Iguacu, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.