What's the best time to see rainbows at Iguaçu Falls?

Brazilian side: late afternoon (no favorable window today). Devil's Throat (Argentine side): in the morning (no favorable window today). A chance, not a guarantee, it depends on the sun appearing at the right moment. Rainbows form with a low sun (below ~42°) behind you, over the falls' mist.

When is the full moon walk (moonbow) at Iguazú?

full-moon nights ±2, visibility depends on clear skies. Sun 25 Oct · Tue 24 Nov · Wed 23 Dec · Fri 22 Jan. The Argentine Devil's Throat runs the Full Moon Walk on these nights, it sells out, book ahead (official site).

Light and water at the Falls

Rainbows at the Falls

The sun's geometry is certain; the sky is the gamble. See today's rainbow chance by side, the best time for a photo and when the next full moon brings the rare lunar rainbow.

🌈 Rainbows at the Falls

today's chance, by side

Brazilian sideLOW chance

late afternoon · no favorable window today

very cloudy

Devil's Throat (Argentine side)LOW chance

in the morning · no favorable window today

very cloudy

A chance, not a guarantee, it depends on the sun appearing at the right moment. Rainbows form with a low sun (below ~42°) behind you, over the falls' mist.

Saw a rainbow at the Falls today? 🌈

🌕 Lunar rainbow (moonbow) calendar

full-moon nights ±2, visibility depends on clear skies

Sun 25 Octdepends on the sky (beyond forecast range)
Tue 24 Novdepends on the sky (beyond forecast range)
Wed 23 Decdepends on the sky (beyond forecast range)
Fri 22 Jandepends on the sky (beyond forecast range)

🌙 The Argentine Devil's Throat runs the Full Moon Walk on these nights, it sells out, book ahead iguazuargentina.com ↗

Sun and moon geometry: astronomical calculation (deterministic). Clouds: weather forecast. Flow: ANA. Known windows: Brazilian side at late afternoon, Argentine Devil's Throat in the morning.

🔭 Foz night sky

stargazing and meteors

poor

Tonight · viewing

45%moon lit

99%clouds at night

Upcoming meteor showers

21 OctOriônidas~20 meteors/h at peak· good from the Southin 17 days
17 NovLeônidas~15 meteors/h at peak· partial from the Southin 44 days
14 DecGemínidas~120 meteors/h at peak· great from the Southin 71 days
04 JanQuadrântidas~110 meteors/h at peak· partial from the Southin 92 days

🪐 To observe with a telescope: the Itaipu Astronomical Center runs observation sessions.

Peak dates are deterministic (±1 day). The rate (ZHR) is the maximum under a perfect, moonless sky, the real count depends on the Moon, clouds and horizon. Clouds: weather forecast.