Middle of the drier season · Weather & things to do
Ilha Grande in August
Ilha Grande sees its driest month, with just 1.5 in (39 mm) of rain, highs of 80°F (26°C) and lows of 64°F (18°C).
At 89/100 for comfort (the top score of the year), it's one of the best months to visit.
- Avg high
- 80°F (26°C)
- Avg low
- 64°F (18°C)
- Rain
- 1.5 in (39 mm)
- Humidity
- 76%
- Cloud cover
- 50%
- Daylight
- ~11 h 12 min
- Comfort score
- 89/100 · Great
What August feels like
Highs settle around 80°F (26°C), warm enough for short sleeves.
Nights cool to an average low of 64°F (18°C).
With 76% average humidity, it feels muggy.
About 1.5 in (39 mm) of rain falls in a typical year's August.
Plan around August
August is one of Ilha Grande's best months on the climate data.
- Last of the best-scoring months: by September, the score drops to 79/100.
- Comfort holds steady from July (87 → 89/100).
- Our Rio, Ilha Grande & Paraty route recommends Apr – Jun, Sep – Nov, so August falls outside its suggested window.
What to pack for August
- Light, breathable clothes80°F afternoons
- Quick-dry fabrics76% average humidity
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Ilha Grande in August
August is good outdoor weather here, so these picks lean toward the open air.
Lagoa Azul
Shallow lagoon between islets with clear water for snorkeling, usually on a boat tour.
Why now August scores 89/100 for comfort, good conditions for being outside.
Lopes Mendes
Long white-sand beach on the ocean side, reached by trail or boat plus a short walk.
Why now Highs near 80°F and 1.5 in of monthly rain make this an easy outdoor pick.
Lazareto Ruins & Aqueduct
Ruins of a 19th-century quarantine station and a stone aqueduct on a short trail from Abraão.
Why now One to do outside while the weather is on your side.
Casarão da Ilha
Long-established spot near the pier for drinks and food as the boats come in.
Pico do Papagaio
982 m peak shaped like a parrot's beak, with a steep forest trail and wide views.
Nearby in August
- Paraty in August~35 mi · highs 83°F, 1.5 in rain · 2°C (4°F) warmer by day, about as wet
- Rio de Janeiro in August~65 mi · highs 77°F, 1.7 in rain · 1°C (3°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~438 m to Ilha Grande's ~6 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Ilha Grande in August: quick answers
Is August a good time to visit Ilha Grande?
Yes. On the climate data it's one of the best months, scoring 89/100. Expect highs of 80°F (26°C) and 1.5 in (39 mm) of rain. Our Rio, Ilha Grande & Paraty route recommends Apr – Jun, Sep – Nov, so August is outside its suggested window.
How hot is Ilha Grande in August?
Average highs are 80°F (26°C) and average lows 64°F (18°C), making it the 4th-coldest month by daytime highs.
Does it rain a lot in Ilha Grande in August?
Not much: about 1.5 in (39 mm) of rain falls across August on average, the driest month of the year. The annual total is about 58.1 in (1475 mm).
What should I pack for Ilha Grande in August?
Bring light, breathable clothes (80°F afternoons), quick-dry fabrics (76% average humidity) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Ilha Grande
Planning Ilha Grande in August?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.