SeasonMapIlha Grande weather in August
Brazil
August in Ilha Grande: nice, a little rain, with muggy air — an excellent time to visit.
#6 of 12 months in Ilha Grande · #663 of 1383 destinations to visit in August · comfort 80/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ilha Grande in August
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 — August
| Daytime high | 17°C / 62°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 17°C / 63°F | |
| Sea temperature | 23°C / 73°F | 🙂 pleasant |
| Rainfall | 77 mm / 3 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 11°C / 51°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 11.3 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 65 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ilha Grande in August
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.
Shoulder seasonan ordinary month(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 August
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 August — FAQ
- Is August a good time to visit Ilha Grande?
- August in Ilha Grande: nice, a little rain, with muggy air — an excellent time to visit. It ranks #6 of 12 months for Ilha Grande on SeasonMap's comfort score (80/100).
- What is the weather like in Ilha Grande in August?
- In August, Ilha Grande averages a daily high of 16.8°C and a low of 13°C, with about 76.7 mm of rain over roughly 9.7 rainy days.
- What is the air quality in Ilha Grande in August?
- Ilha Grande has a mean US Air Quality Index of about 65 in August.
Other months in Ilha Grande
Compare Ilha Grande in August
Warmer or cooler than Ilha Grande in August
Similar destinations in South America — August
Within 300 km: Rio de Janeiro's Ipe trees in flower around 15 Aug – 30 Sep, and São Paulo's Ipe trees in flower around 1 Jul – 30 Sep.