Weather in Foz do Iguaçu

Planning your day or a trip to Foz do Iguaçu? Check out the most up-to-date weather data and forecasts right here to make your stay as comfortable as possible.

The climate in Foz do Iguaçu, located in Brazil, can be characterized as humid subtropical. The city enjoys warm weather throughout most of the year, with noticeable but not drastic temperature fluctuations between seasons. Travellers should expect predominantly warm and sunny days, although humidity can be high, especially during the summer months.

There are two distinct main seasons in Foz do Iguaçu. Summer, which lasts roughly from December to March, is characterized by hot and humid weather. Average daytime temperatures during this period often rise above 30°C (for example, in January the average maximum is 31.0°C), and this is also the time with the highest amount of rainfall and rainy days (up to 17 days in January). Winter, falling between June and August, offers milder and drier conditions. Average temperatures at this time hover around 18-20°C (for instance, the average temperature in July is 18.5°C), and the number of rainy days is significantly lower (only about 5-7 days in July-August).

The transitional seasons – spring (September-November) and autumn (April-May) – usually delight visitors with pleasant warm weather and moderate rainfall. In general, while rain is possible at any time of the year, its intensity and frequency are noticeably higher during the summer period. The lowest amount of precipitation and rainy days occurs in mid-winter, particularly in July.

The city of Foz do Iguaçu experiences a warm climate throughout the year, though with noticeable seasonal temperature variations. The hottest months are traditionally January (average temperature 26.9°C, maximum up to 31.0°C) and December (average 26.5°C, maximum up to 31.0°C). During these periods, the daytime heat can be quite intense. The coolest months are considered to be July, when the average temperature drops to 18.5°C (average minimum 13.7°C), and June with an average temperature of 18.6°C (average minimum 14.7°C), offering milder weather conditions.

Summer in Foz do Iguaçu, covering the period roughly from December to March, is characterized as hot and, given the number of days with precipitation, quite humid. Daytime temperatures often rise above 30°C, while nights remain warm, with temperatures rarely falling below 21-22°C. The winter months, from June to August, bring palpable relief from the summer heat. The weather at this time is usually mild and pleasant: during the day, the thermometer stays in the range of 22-25°C, and at night it drops to 13-15°C. Throughout the year, noticeable diurnal temperature variations are observed: the difference between daytime highs and nighttime lows averages 8-10°C. These fluctuations can be slightly more pronounced in the cooler and drier months, such as July and August.

In the city of Foz do Iguaçu, precipitation falls throughout the year primarily as rain, which is typical for its climate. Snow is not a typical phenomenon here. The distribution of precipitation has a distinct seasonality, allowing for the distinction between wetter and drier periods.

The highest amount of precipitation and rainy days is usually observed from October to March. For example, January is one of the wettest months in terms of rain frequency, counting on average 17 rainy days, with total precipitation amounting to about 6 mm. October also stands out as a month with high precipitation levels, reaching 7 mm, falling over approximately 13 days. Overall, during this period, it rains quite often, but judging by the total millimetres, the rains may be regular and moderate rather than torrential.

The drier season in Foz do Iguaçu falls between April and September. The driest month is typically July, when minimal precipitation falls – only about 2 mm, and the number of rainy days drops to 5. August and September are also characterized by less rainfall (about 3 mm) and fewer rainy days compared to the wet season, amounting to 7 and 10 days respectively. During these months, the likelihood of catching prolonged periods of sunny weather is significantly higher.

When planning a trip to Foz do Iguaçu, it is important to consider its humid subtropical climate, which dictates what you should pack in your suitcase. Regardless of the time of year, you will definitely need comfortable walking shoes, as you will likely spend a lot of time exploring the famous waterfalls and the surrounding national parks. Don't forget sunscreen with high SPF, sunglasses, and a hat for protection against the strong sun. It is also recommended to bring insect repellent. Given the frequent rains throughout the year and the powerful spray from the waterfalls, a light waterproof jacket or rain poncho will become your indispensable companion.

The hottest and most humid months in Foz do Iguaçu are from December to March, when the average temperature holds at 26-27°C (maximum up to 31°C), and rainfall is quite frequent, especially in January (up to 17 rainy days). At this time, pack light, breathable clothing: shorts, t-shirts, and sundresses. From April to September, the weather becomes milder; daytime temperatures are pleasant, but evenings and early mornings can be cool, especially from May to August (average temperatures around 18-20°C, with lows down to 14°C). For this period, the layering principle is ideal: t-shirts, light jumpers or fleece, as well as a windbreaker or light jacket. Although precipitation is lowest in the middle of the year (July), do not completely forego light rain protection, as short showers are possible even in relatively dry months, and in October and November, the amount of rainfall and rainy days increases again.