Iguazu Falls · Month comparison

October vs May

May ranks #1 overall vs October at #5. Shoulder month: pleasantly cool (23C/13C), 30% off summer hotel rates, river flow tapering but still strong.

October Iguazu spring greening with regenerating river flow

October

#5 of 12 months

Best match

Wet season starts in earnest — water flow climbs sharply and the jungle re-greens after dry winter.

  • ↑Falls visibly fuller than September with rapid flow increase
  • ↑Coatis and butterflies most active in warming jungle
May cooler-light Iguazu Falls Devil's Throat from above

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
FactorOctoberMay
Weather score
7
8
Value score
6
8
Crowd score
6
7
Events score
4
4
Atmosphere
8
8
Avg high temp28°C23°C
Monthly rain165mm110mm
Daily sunshine7hrs6hrs

October trade-offs

  • ↓Rainy-season volume returns — full-day downpours possible
  • ↓Humidity climbs back to 75%+
  • ↓Higher mosquito activity

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
See all 12 months for Iguazu Falls →October in detail →May in detail →
Scores compare months within Iguazu Falls. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →