SeasonMapIlha Grande weather in May
Brazil
May in Ilha Grande: nice, a little rain, with muggy air — an excellent time to visit.
#3 of 12 months in Ilha Grande · #502 of 1383 destinations to visit in May · comfort 84/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ilha Grande in May
Notes from nearby Rio de Janeiro (111 km away)
Ilha Grande doesn't have its own notes for May yet — these are about Rio de Janeiro, close enough to share the season.
May is the local secret: 26°C, dry, the sea still warm, and Ipanema without the New Year crowd. Summer here (January) is a humid 38°C that flattens you before noon whatever the beach photos suggest.
Other months in Ilha Grande
Ilha Grande's forum calls June the start of the cooler, drier season — less rain than the summer months, but regulars note it's noticeably cooler for the beach than northern Brazil destinations like Salvador if warmth matters more to you than avoiding crowds. Still one of the better months overall, since the rainier stretch has passed.
Add your own note from Ilha Grande's card on the map.
Ilha Grande climate normals — May
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 15°C / 59°F | |
| Feels like (high) | 18°C / 64°F | |
| Sea temperature | 25°C / 76°F | 🙂 pleasant |
| Rainfall | 78 mm / 3.1 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 9 h/day | |
| Daylight | 11 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 57 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ilha Grande in May
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Busyone of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Ilha Grande's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherIlha Grande's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Ilha Grande in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Clear water and empty trails
1 May – 31 Aug · usuallyDry seasonThe storms stop, the sea settles and underwater visibility is at its best of the year; the island is quiet enough that half the pousadas take the month off. Cool for swimming by August.
Nearby, and something's on
Within 300 km of Ilha Grande — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Ilha Grande?
Ilha Grande in May — FAQ
- Is May a good time to visit Ilha Grande?
- May in Ilha Grande: nice, a little rain, with muggy air — an excellent time to visit. It ranks #3 of 12 months for Ilha Grande on SeasonMap's comfort score (84/100).
- What is the weather like in Ilha Grande in May?
- In May, Ilha Grande averages a daily high of 17.9°C and a low of 14.8°C, with about 77.6 mm of rain over roughly 10.8 rainy days.
- What is the air quality in Ilha Grande in May?
- Ilha Grande has a mean US Air Quality Index of about 57 in May.
Other months in Ilha Grande
Compare Ilha Grande in May
Warmer or cooler than Ilha Grande in May
Similar destinations in South America — May
Within 300 km: São Paulo's Virada Cultural on 23–24 May, and Rio de Janeiro's Dry season around 15 May – 15 Sep.