Earth & landscapes · Argentina / Brazil · spring
Snowmelt Waterfalls & River Peak Flow in Iguazú Falls
Spring snowmelt and seasonal precipitation discharge peaks, scored from thermal thaw accumulation and watershed climatology.
Readiness
Medium confidence1
Peak in 57 days
Live summary
As of 9 Nov 2026, Snowmelt Waterfalls & River Peak Flow readiness in Iguazú Falls, Argentina / Brazil is 1 out of 100, phase emerging. Accumulated growing degree days since 15 Sept 2026 are 945.8 against a peak threshold of 640.0 at base 5°C. The timing model places peak on 5 Jan 2027. Mean cloud cover over the next three days is 43%.
- Readiness
- 1 / 100
- Status
- Emerging
- Confidence
- Medium confidence
- Evidence type
- Forecast
- Model
- Growing degree days
- Timing
- Peak in 57 days
- Estimated peak window
- 28 Dec 2026 – 13 Jan 2027
- Climatological peak
- 15 Jan 2027
- Adjusted peak
- 5 Jan 2027
- Accumulated GDD
- 945.8 of 640.0
- Planetary K-index
- n/a
- NDVI
- n/a
- Cloud cover, next 3 days
- 43%
- Coordinates
- 25.70° S, 54.44° W
- Updated
- 9 Nov 2026, 08:42 UTC
Warmth moved the peak 10 days earlier, to 5 Jan 2027.
Fourteen-day outlook
Projected readiness for each day. Botanical and wildlife bars use forecast temperature. Meteor shower bars combine stream activity, lunar phase, and forecast cloud cover. Aurora bars use the NOAA 3-day Kp forecast when available and a quiet-oval baseline with forecast cloud cover for days 4–14.
Mon 9
1 out of 100 on 2026-11-09
24% cld
Tue 10
1 out of 100 on 2026-11-10
54% cld
Wed 11
1 out of 100 on 2026-11-11
50% cld
Thu 12
1 out of 100 on 2026-11-12
29% cld
Fri 13
1 out of 100 on 2026-11-13
25% cld
Sat 14
2 out of 100 on 2026-11-14
71% cld
Sun 15
2 out of 100 on 2026-11-15
37% cld
Mon 16
2 out of 100 on 2026-11-16
90% cld
Tue 17
2 out of 100 on 2026-11-17
98% cld
Wed 18
3 out of 100 on 2026-11-18
5% cld
Thu 19
3 out of 100 on 2026-11-19
27% cld
Fri 20
4 out of 100 on 2026-11-20
90% cld
Sat 21
4 out of 100 on 2026-11-21
98% cld
Sun 22
5 out of 100 on 2026-11-22
100% cld
Field notes & historical context
275 cascades along the Upper Iguazú basin swell during the warm South American wet season from November through March.
High-elevation snowpacks act as natural reservoirs; as spring growing degree days accumulate across alpine basins, river discharge rises sharply to a narrow multi-week crest before tapering in late summer.
25.70° S, 54.44° W · America/Argentina/Cordoba
Sources & data freshness
Forecast · Medium confidence · Updated 9 Nov 2026, 08:42 UTC
- Open-Meteo ERA5 & Forecast
Daily max/min temperatures (GDD base 5°C) and 14-day outlook
- USGS National Water Information System / Alpine Hydrology
Watershed snowmelt discharge climatology and peak-flow timing
Safety & responsible visiting
Peak spring runoff brings swift, frigid water, slippery granite and basalt spray zones, and sudden flash surges. Stay behind guardrails and never wade above waterfall brinks.
Natural phenomena depend on live weather, local access rules, and habitat conditions. Verify local advisories before travelling.
Ground-truth provenance
Community reportField observations for Iguazú Falls
Community observations supplement satellite and weather models with eye-level reports. Every submission is tagged as a Community report with provenance and moderation status—never blended silently into automated readiness scores.
No community field reports have been logged for Iguazú Falls in this session yet.
Related places
Other Snowmelt Waterfalls & River Peak Flow regions on the index.