Iguazu Falls · Month comparison
March vs May
May ranks #1 overall vs March at #6. Shoulder month: pleasantly cool (23C/13C), 30% off summer hotel rates, river flow tapering but still strong.
March
#6 of 12 months
Strong option
Post-summer sweet spot: still-impressive water flow, fewer crowds, temperatures sliding off summer peak.
- ↑Crowds down 40% from January with water still high
- ↑Macuco Safari boats running consistently (post-flood season)
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 | March | May |
|---|---|---|
| Weather score | 6 | 8 |
| Value score | 6 | 8 |
| Crowd score | 6 | 7 |
| Events score | 4 | 4 |
| Atmosphere | 9 | 8 |
| Avg high temp | 30°C | 23°C |
| Monthly rain | 140mm | 110mm |
| Daily sunshine | 7hrs | 6hrs |
March trade-offs
- ↓Late-summer thunderstorms still common afternoons
- ↓Argentine peso volatility — withdraw small amounts at ATMs
- ↓Mosquitoes peak in the jungle trails
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 →