August scores 80/100 for outdoor ceremonies: very low rain risk (3 wet days, 42mm), 20°C afternoons cooling to about 14°C for the reception, and 11.1 hours of daylight for the photography schedule. December is the month to avoid at 33/100.
August outdoor ceremony score: 80/100
Climate normals for Iguazu Falls rescored on wedding-specific weighting. Once your date falls inside the 14-day window the live forecast on this page takes over.
Last updated: · Live forecast data refreshes hourly.
| Best wedding month | August — 80/100 |
| Second choice | July — 76/100 |
| Month to avoid | December — 33/100 |
| Rain risk in the best month | Very low — rain on about 3 days |
| Guest comfort | 93/100 at 20°C |
| Reception temperature | ≈ 14°C after sunset in August |
| Photo light | 8h of sun across a 11.1h day |
| Months scoring 65+ | 4 of 12 |
August keeps seated guests at 20°C in the afternoon and around 14°C after sunset — the closest Iguazu Falls gets to a ceremony that needs neither shade structures nor patio heaters.
Rain falls on roughly 3 days in August (very low risk, 42mm). A simple marquee-on-standby is usually enough.
August gives 11.1 hours of daylight and about 8 hours of direct sun per day, so a late-afternoon ceremony puts portraits inside golden hour rather than after it.
December scores 33/100 for weddings in Iguazu Falls: 31°C highs, 172mm of rain and 24°C evenings make a fully outdoor plan fragile.
Scored on rain risk, guest comfort, evening temperature and photographic light — deliberately different weighting from the travel score.
| Month | Wedding score | Rain risk | Afternoon | Evening | Guest comfort | Photo light |
|---|---|---|---|---|---|---|
| January | 33/100 | Moderate (12 days) | 33°C | 26°C | 54/100 | 36/100 |
| February | 34/100 | Moderate (11 days) | 33°C | 26°C | 54/100 | 24/100 |
| March | 45/100 | Moderate (9 days) | 31°C | 24°C | 62/100 | 29/100 |
| April | 60/100 | Low (6 days) | 28°C | 22°C | 75/100 | 31/100 |
| May | 59/100 | Moderate (9 days) | 25°C | 18°C | 87/100 | 33/100 |
| June | 70/100 | Low (6 days) | 22°C | 16°C | 100/100 | 36/100 |
| July | 76/100 | Low (4 days) | 20°C | 14°C | 93/100 | 64/100 |
| August | 80/100 | Very low (3 days) | 20°C | 14°C | 93/100 | 68/100 |
| September | 66/100 | Moderate (8 days) | 22°C | 16°C | 100/100 | 53/100 |
| October | 47/100 | Moderate (13 days) | 25°C | 18°C | 87/100 | 24/100 |
| November | 43/100 | Moderate (11 days) | 28°C | 22°C | 75/100 | 18/100 |
| December | 33/100 | Moderate (13 days) | 31°C | 24°C | 62/100 | 19/100 |
Wedding weather is scored differently from travel weather: seated guests in formalwear tolerate a narrower band than sightseers, and the ceremony hour matters more than the daily average. Each month in Iguazu Falls is scored 0–100 on the weighting below.
| Factor | Weight | What it measures |
|---|---|---|
| Dry conditions | 38% | Share of days with measurable rain — the single factor most likely to force a backup plan. |
| Guest comfort | 27% | Distance from a 22°C daytime ideal, with an extra penalty for humid heat above 24°C. |
| Evening temperature | 20% | Modelled reception-hour temperature against an 18°C ideal for an outdoor evening. |
| Photo light | 15% | Sunshine hours and daylight length, which set the length and quality of the golden hour window. |
Based on long-run climate averages rather than a forecast. Plan the ceremony around the golden hour — see golden hour times for Iguazu Falls linked below.
August, at 80/100. It combines very low rain risk with 20°C afternoons and roughly 14°C evenings, which is the most forgiving combination Iguazu Falls offers for seated guests.
December scores 33/100: 31°C highs, 172mm of rain over about 13 days and 24°C evenings make a fully outdoor plan fragile.
In August rain falls on roughly 3 of 30 days, so the single-day probability is about 10%. In December that rises to about 43%.
A marquee on standby is usually enough in August, where rain risk is very low. Outside the 4 months scoring 65 or higher, book real covered space.
August gives 11.1 hours of daylight and about 8 hours of direct sun. Put portraits in the final 60–90 minutes of daylight so they land inside golden hour rather than after it.