Foz do Iguaçu has a humid subtropical climate (Cfa) with hot humid summers, mild winters, and rainfall distributed throughout the year. The city sits at 173 meters (568 ft) above sea level in the Paraná River basin, where the massive Iguaçu River plunges over the Paraná Plateau. The falls themselves generate a permanent mist microclimate that keeps the surrounding rainforest lush year-round. Annual rainfall averages 1,700 mm (67 inches), with monthly temperatures ranging from 16°C (61°F) in July to 32°C (90°F) in January. Humidity rarely drops below 70%.
Foz do Iguaçu Weather by Month: January
January is the hottest and wettest month. Average high of 33°C (91°F), low of 22°C (72°F). Rainfall averages 180 mm (7 inches) over 14 rainy days, typically as afternoon thunderstorms that clear within an hour. Humidity sits at 78%. The falls are at their most powerful with maximum water volume, and the surrounding rainforest is at its greenest. Sunrise around 6:00 AM, sunset near 7:30 PM, giving you 13+ hours of daylight. The mist from the falls is intense , you will get soaked on the walkways, which is actually welcome in this heat. Wear quick-dry clothes and waterproof your phone.
Foz do Iguaçu Weather by Month: February
Similar to January but slightly less rain. Average high of 33°C (91°F), low of 22°C (72°F). Rainfall drops to 155 mm (6 inches) over 12 rainy days. Humidity remains at 77%. February is peak summer vacation month for Brazilians and Argentines, so the falls get crowded. Carnival usually falls in February or early March, bringing an extra surge of domestic visitors. Water volume at the falls is still at maximum. Afternoon thunderstorms remain frequent but tend to be shorter than January’s.
Foz do Iguaçu Weather by Month: March
Autumn begins with temperatures still summer-like. Average high of 31°C (88°F), low of 21°C (70°F). Rainfall drops noticeably to 140 mm (5.5 inches) over 10 rainy days. Humidity decreases slightly to 75%. The water volume at the falls remains high through March. This is one of the best months to visit , the weather is still warm enough for the boat rides under the falls, but the intense January heat has moderated. Days remain long with sunset around 6:45 PM after daylight saving ends in mid-February.
Foz do Iguaçu Weather by Month: April
Autumn settles in with comfortable temperatures. Average high of 27°C (81°F), low of 18°C (64°F). Rainfall at 150 mm (6 inches) over 9 rainy days. Humidity at 76%. The water volume begins to decrease but the falls remain spectacular. This is the start of the dry shoulder season with fewer crowds than summer. Morning temperatures can feel cool for the boat rides , bring a light layer. The rainforest trails are less muddy than summer months, making April excellent for hiking the Macuco Trail.
Foz do Iguaçu Weather by Month: May
Pleasant autumn weather with decreasing rainfall. Average high of 24°C (75°F), low of 14°C (57°F). Rainfall at 155 mm (6 inches) over 9 rainy days. Humidity at 77%. This is the start of the best overall season , warm enough for all activities, cool enough for comfortable hiking, and the crowds have thinned considerably. The jacaranda trees bloom purple across the city. Water volume at the falls is moderate but still impressive. A light jacket is useful for evenings.
Foz do Iguaçu Weather by Month: June
Winter begins with mild days and cool nights. Average high of 23°C (73°F), low of 12°C (54°F). This is the driest month with only 110 mm (4.3 inches) over 7 rainy days. Humidity drops to 74%. The falls’ water volume decreases noticeably in winter, with some secondary falls reducing to a trickle, but the main curtain of Devil’s Throat (Garganta do Diabo) remains powerful. Clear blue skies are more common than in summer. Perfect hiking weather , the Macuco Trail and Poço Preto trails are at their best. Pack a fleece for mornings and evenings.
Foz do Iguaçu Weather by Month: July
The coolest month but still mild by temperate standards. Average high of 23°C (73°F), low of 11°C (52°F). Rainfall at 90 mm (3.5 inches) over 7 rainy days , the absolute driest month. Humidity at 72%. This is peak tourist season for Argentine and Brazilian winter school holidays (first two to three weeks of July), so the falls can get surprisingly crowded despite lower water volume. The reduced mist means better visibility for photographs from the walkways. Sunrise around 7:20 AM, sunset near 6:00 PM , shorter days mean you need to start early to see everything.
Foz do Iguaçu Weather by Month: August
Late winter, still dry and mild. Average high of 25°C (77°F), low of 13°C (55°F). Rainfall at 110 mm (4.3 inches) over 7 rainy days. Humidity at 70%. The forest trails remain dry and accessible. Water volume at the falls is at its annual low point, which means less dramatic views of the secondary falls but excellent conditions for the Macuco Safari boat ride , less risk of the ride being canceled due to high water. August sees the start of the whale-watching season off Brazil’s southern coast if you’re continuing your trip south.
Foz do Iguaçu Weather by Month: September
Spring begins with rising temperatures and still-manageable rain. Average high of 27°C (81°F), low of 15°C (59°F). Rainfall increases to 145 mm (5.7 inches) over 9 rainy days. Humidity at 72%. The rainforest begins flowering, with orchids and bromeliads in bloom along the trails. This is one of the best months overall , warm, not yet hot, with moderate crowds and good water volume at the falls. The boat rides are operational and comfortable.
Foz do Iguaçu Weather by Month: October
Spring transitions toward summer heat. Average high of 30°C (86°F), low of 18°C (64°F). Rainfall jumps to 190 mm (7.5 inches) over 11 rainy days , the rainiest month statistically. Humidity at 75%. Afternoon thunderstorms become the norm again. The falls’ water volume begins rising from spring rains upstream. October can be a gamble , you might get a week of perfect sunny days or a week of daily downpours. Book at least 3 days to give yourself weather flexibility.
Foz do Iguaçu Weather by Month: November
Summer heat returns with high humidity. Average high of 31°C (88°F), low of 20°C (68°F). Rainfall at 175 mm (6.9 inches) over 12 rainy days. Humidity at 75%. The falls are regaining their full power. November is a sweet spot , the weather is hot and the falls are impressive, but the peak summer crowds have not yet arrived (those start in late December). The coati population (native raccoon-like animals) is active around the park, especially near the food court at Porto Canoas.
Foz do Iguaçu Weather by Month: December
Full summer conditions. Average high of 32°C (90°F), low of 22°C (72°F). Rainfall at 170 mm (6.7 inches) over 13 rainy days. Humidity at 77%. The falls are at maximum volume, and the rainforest is at its most lush. The Christmas-to-New-Year period brings peak crowds and premium hotel rates from December 20 through January 5. If visiting in December, aim for the first two weeks. The park opens at 9:00 AM , arrive at opening to beat both the heat and the tour buses that arrive by 10:30 AM. For more detailed information, see our best time to visit guide. For more detailed information, see our things to do guide. For more detailed information, see our events and festivals calendar. For more detailed information, see our neighborhoods guide. For more detailed information, see our where to stay guide. For more detailed information, see our travel tips and FAQ.
| Month | Avg High | Avg Low | Rain (mm) | Rain Days | Humidity |
|---|---|---|---|---|---|
| Jan | 33°C / 91°F | 22°C / 72°F | 180 | 14 | 78% |
| Feb | 33°C / 91°F | 22°C / 72°F | 155 | 12 | 77% |
| Mar | 31°C / 88°F | 21°C / 70°F | 140 | 10 | 75% |
| Apr | 27°C / 81°F | 18°C / 64°F | 150 | 9 | 76% |
| May | 24°C / 75°F | 14°C / 57°F | 155 | 9 | 77% |
| Jun | 23°C / 73°F | 12°C / 54°F | 110 | 7 | 74% |
| Jul | 23°C / 73°F | 11°C / 52°F | 90 | 7 | 72% |
| Aug | 25°C / 77°F | 13°C / 55°F | 110 | 7 | 70% |
| Sep | 27°C / 81°F | 15°C / 59°F | 145 | 9 | 72% |
| Oct | 30°C / 86°F | 18°C / 64°F | 190 | 11 | 75% |
| Nov | 31°C / 88°F | 20°C / 68°F | 175 | 12 | 75% |
| Dec | 32°C / 90°F | 22°C / 72°F | 170 | 13 | 77% |
