Iguazu Falls records about 1750mm of rain across roughly 105 wet days a year, which is a 29% chance on an average day. December is the wettest month at 172mm (10% of the annual total) and August the driest at 42mm. Local rain type: thunderstorms. Iguazú Falls are spectacular year-round — high water (October-March) brings maximum power, low water (April-September) reveals more rock formations.
Chance of rain on an average day: 29%
Rainfall climatology for Iguazu Falls. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1750mm |
| Rain days per year | 105 |
| Odds on an average day | 29% |
| Wettest month | December — 172mm over 13 days |
| Driest month | August — 42mm over 3 days |
| Rain type | thunderstorms |
| Best dry window | April through June offers manageable water levels with less crowd and spray. |
| Worst rain window | October through December brings the heaviest rain and maximum waterfall volume. |
December delivers 310% more rain than August (172mm vs 42mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 10% of the annual total, so rain in Iguazu Falls is spread through the year — there is no season you can rely on being dry.
Iguazu Falls rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 13 days in December against 3 in August — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 152mm | 12 | 40% | 33°C |
| February | 148mm | 11 | 37% | 33°C |
| March | 118mm | 9 | 30% | 31°C |
| April | 82mm | 6 | 20% | 28°C |
| May | 115mm | 9 | 30% | 25°C |
| June | 72mm | 6 | 20% | 22°C |
| July | 52mm | 4 | 13% | 20°C |
| August | 42mm | 3 | 10% | 20°C |
| September | 98mm | 8 | 27% | 22°C |
| October | 168mm | 13 | 43% | 25°C |
| November | 145mm | 11 | 37% | 28°C |
| December | 172mm | 13 | 43% | 31°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Iguazu Falls we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Iguazu Falls records rain on roughly 105 days a year — about a 29% chance on any given day — totalling around 1750mm.
December, with about 172mm over 13 rain days. That is 10% of the entire year's rainfall in a single month.
August is the driest month at 42mm across roughly 3 days. April through June offers manageable water levels with less crowd and spray.
Iguazú Falls are spectacular year-round — high water (October-March) brings maximum power, low water (April-September) reveals more rock formations.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.