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Foz do Iguaçu has a humid subtropical climate.
Hot, humid summers. Cool-to-cold winters. Rain in every month of the year — here's what that means in plain terms.
What this climate feels like
The four things a regular visitor actually wants to know:
Highs near 91°F in January.
Lows near 53°F in July.
About 50 in of rain a year. Wettest in October.
A roughly even mix of sun and cloud.
What "humid subtropical" means
Climate scientists sort every place on Earth into about 30 climate types, based on how hot, cold, wet and dry it is across the year. Foz do Iguaçu's type — humid subtropical — sits in the broad family of mild, temperate climates. Despite the name, it does not mean tropical or frost-free: Foz do Iguaçu still has cool-to-cold winters.
Researchers write climate types as a short letter code. Here is what each letter means:
Cities with the same climate as Foz do Iguaçu
A humid subtropical climate (Cfa) — these recognizable cities share it. If you know one of them, you know roughly what to expect.
Foz do Iguaçu sits near a climate boundary
This city's climate sits within about 0.4 °C of the next type along. A slightly cooler or warmer decade could change which side of the boundary it lands on — but the lived weather doesn't change at the line.
Has Foz do Iguaçu's climate type changed?
Stable — Foz do Iguaçu's climate has held the same type between the 1971–2000 and 1991–2020 normals. The label is steady; the climate beneath it is still warming.
What this climate means for you
Warm-season grasses and broad-leaved evergreens thrive; gardens are productive but humidity brings fungal pressure. Frost is occasional, so tender perennials often overwinter.
Spring and autumn are pleasant; summer is hot and humid; winter is mild and a fine alternative to escaping cold further north.
Hot, sticky summers and mild winters — air conditioning runs hard from late spring to early autumn. Storm season needs preparation in coastal areas.
Where these numbers come from
The climate type and the month-by-month figures on this page are computed from Foz do Iguaçu's measured 30-year climate normals (1991–2020) — the same official records behind Foz do Iguaçu's main climate page, so the two always agree.
Long-range climate maps measure things slightly differently and can place a city in a neighbouring category. Where they differ, this page uses the measured station record as the climate today.
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Cataratas Intl, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.