Iguazu Falls · Month comparison
August vs May
May ranks #1 overall vs August at #2. Shoulder month: pleasantly cool (23C/13C), 30% off summer hotel rates, river flow tapering but still strong.
August
#2 of 12 months
Best match
Driest month with stable clear weather — water at minimum but viewing conditions ideal.
- ↑Driest month of year — boardwalks consistently open
- ↑Dry low water reveals river bed and rapids upstream
May
#1 of 12 months
Best match
Shoulder month: pleasantly cool (23C/13C), 30% off summer hotel rates, river flow tapering but still strong.
- ↑Hotel Loi Suites Iguazu from USD 180 vs USD 280+ in January
- ↑Argentine Park Upper Trail cool enough for full-day walking
| Factor | August | May |
|---|---|---|
| Weather score | 9 | 8 |
| Value score | 7 | 8 |
| Crowd score | 6 | 7 |
| Events score | 4 | 4 |
| Atmosphere | 8 | 8 |
| Avg high temp | 25°C | 23°C |
| Monthly rain | 70mm | 110mm |
| Daily sunshine | 7hrs | 6hrs |
August trade-offs
- ↓Falls noticeably less full than summer peaks
- ↓San Martin Island access via boat sometimes paused on low water
- ↓Smoke from agricultural burning in nearby fields can haze views
May trade-offs
- ↓Evenings can drop to 10C — bring layers
- ↓Some cataracts already visibly thinning vs Feb
- ↓Boat tours (Macuco) suspend on cold/cloudy days
Scores compare months within Iguazu Falls. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →