Iguazu in Summer
In summer (December, January and February), Iguazu sees average daytime highs around 31°C and overnight lows near 22°C, with 492 mm of rain over about 44 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 34% of the time across summer, and the air most often feels oppressive.
Summer is Iguazu's weakest season of the year to visit on our travel score. For the whole year in context, see Iguazu's year-round climate.
- Avg daytime high
- 31°C
- warmest season of the year
- Avg overnight low
- 22°C
- Rainfall
- 492 mm
- 44 wet days
- Avg wind
- 8 km/h
- Travel score
- 4.1
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Iguazu in Summer
Across summer, daytime highs hold fairly steady around 31°C.
A typical summer day in Iguazu reaches about 31°C and drops to 22°C overnight. The warmest of the three months is January, the coolest December.
How summer really feels in Iguazu
Once humidity and wind are folded in, summer brings about 90 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Iguazu weather by month
How the three summer months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 22° | 157 | 15.3 | 13.4 | 3.9 |
| Feb | 31° / 22° | 151 | 14 | 12.9 | 4.1 |
| Mar | 30° / 21° | 141 | 12.5 | 12.2 | 4.8 |
| Apr | 28° / 18° | 138 | 9.4 | 11.4 | 6.3 |
| May | 24° / 15° | 162 | 9.1 | 10.8 | 7.1 |
| Jun | 22° / 14° | 137 | 9.2 | 10.4 | 6.9 |
| Jul | 22° / 13° | 118 | 8.5 | 10.6 | 7.2 |
| Aug | 25° / 14° | 94 | 7 | 11.1 | 7.7 |
| Sep | 27° / 16° | 155 | 9.9 | 11.8 | 6.7 |
| Oct | 28° / 19° | 197 | 13.2 | 12.6 | 5.5 |
| Nov | 30° / 20° | 158 | 11.7 | 13.3 | 5.0 |
| Dec | 31° / 21° | 184 | 14.8 | 13.6 | 4.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 34% of the time across summer.
Chance of precipitation in Summer
Iguazu gets around 492 mm of rain over 44 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 30 min in early December to 12 h 36 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.2 kWh/m².
Is summer a good time to visit Iguazu?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Iguazu for sightseeing.
What to pack for Iguazu in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Iguazu sees daytime highs around 31°C and nights near 22°C. Pack light clothes, rain gear and sun protection. About 44 days see rain.
UV index in Iguazu in Summer
Clear-sky midday UV across summer averages around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Iguazu peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 14 | 11 | 9 | 6 | 5 | 5 | 6 | 6 | 10 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | Moderate | High | High | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 14 | Extreme |
| Mar | 11 | Extreme |
| Apr | 9 | Very high |
| May | 6 | High |
| Jun | 5 | High |
| Jul | 5 | Moderate |
| Aug | 6 | High |
| Sep | 6 | High |
| Oct | 10 | Very high |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in Iguazu in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Iguazu is worst in September — around 23 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (March, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 8 | 8 | 9 | 10 | 10 | 11 | 14 | 23 | 14 | 10 | 8 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 8 | Good |
| Mar | 8 | Good |
| Apr | 9 | Good |
| May | 10 | Good |
| Jun | 10 | Good |
| Jul | 11 | Good |
| Aug | 14 | Moderate |
| Sep | 23 | Moderate |
| Oct | 14 | Moderate |
| Nov | 10 | Good |
| Dec | 8 | Good |
Where is Iguazu?
Iguazu sits at 25.6°S, 54.6°W, 177 m above sea level, in Argentina. The nearest listed city is Presidente Franco, 5.0 km away.
Topography around Iguazu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Iguazu.
Within 3 km, the terrain around Iguazu has only modest variations in elevation — a maximum elevation change of 139 m around an average of 175 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 198 m; within 80 km, significant variations in elevation — a maximum elevation change of 568 m.
The land around Iguazu is covered by trees (50%) and artificial surfaces (30%) within 3 km, trees (52%) and cropland (22%) within 16 km, and trees (46%) and cropland (38%) within 80 km.
Argentina travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / I
- 220 V · 50 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $14,898
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Homicide rate
- 4.5
- per 100k, 2023
- Road deaths
- 14.1
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- High
- EF EPI 575
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Iguazu (-25.5991°, -54.5735°, elevation 177 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.