Middle of the wetter season · Weather & things to do
Ilha Grande in December
Ilha Grande edges warmer than November, with highs of 85°F (29°C), lows of 73°F (23°C) and about 8.4 in (214 mm) of rain.
With a comfort score of 47/100 (11th of 12), it's one of the toughest months, held back mainly by rain.
- Avg high
- 85°F (29°C)
- Avg low
- 73°F (23°C)
- Rain
- 8.4 in (214 mm)
- Humidity
- 83%
- Cloud cover
- 71%
- Daylight
- ~13 h 25 min
- Comfort score
- 47/100 · Fair
What December feels like
Highs settle around 85°F (29°C), warm enough for short sleeves.
Nights stay warm too, with lows averaging 73°F (23°C).
With 83% average humidity, it feels muggy.
Expect regular rain: about 8.4 in (214 mm) falls in the month.
Plan around December
December is one of the lower-scoring months here; the best are June – August.
- Inside the wettest three-month stretch, November – January.
- Longest days of the year, about 13 h 25 min of daylight.
- Comfort slips from 53/100 in November to 47/100.
- Our Rio, Ilha Grande & Paraty route recommends Apr – Jun, Sep – Nov, so December falls outside its suggested window.
What to pack for December
- Light, breathable clothes85°F afternoons
- Sunscreen, sunglasses and a hatstrong sun this month
- Quick-dry fabrics83% average humidity
- Rain jacket and waterproof shoes8.4 in of rain on average
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Ilha Grande in December
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
Cachoeira da Feiticeira
Waterfall about 1.5 hours' walk from Abraão, with a pool for a cool swim.
Lopes Mendes
Long white-sand beach on the ocean side, reached by trail or boat plus a short walk.
Pico do Papagaio
982 m peak shaped like a parrot's beak, with a steep forest trail and wide views.
Lazareto Ruins & Aqueduct
Ruins of a 19th-century quarantine station and a stone aqueduct on a short trail from Abraão.
Lua e Mar
Beachfront restaurant on Abraão's sand, known for moqueca and fish with green banana.
Why now A sit-down stop to wait out showers in a month with 8.4 in of rain.
Nearby in December
- Paraty in December~35 mi · highs 89°F, 8.0 in rain · 2°C (4°F) warmer by day, about as wet
- Rio de Janeiro in December~65 mi · highs 82°F, 9.1 in rain · 2°C (3°F) cooler by day, wetter
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 December: quick answers
Is December a good time to visit Ilha Grande?
It's one of the tougher months here, scoring 47/100, held back mainly by rain. The best months are June – August. Expect highs of 85°F (29°C) and 8.4 in (214 mm) of rain. Our Rio, Ilha Grande & Paraty route recommends Apr – Jun, Sep – Nov, so December is outside its suggested window.
How hot is Ilha Grande in December?
Average highs are 85°F (29°C) and average lows 73°F (23°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in Ilha Grande in December?
Yes: about 8.4 in (214 mm) of rain falls across December on average, the 2nd-wettest month of the year. The annual total is about 58.1 in (1475 mm).
What should I pack for Ilha Grande in December?
Bring light, breathable clothes (85°F afternoons), sunscreen, sunglasses and a hat (strong sun this month), quick-dry fabrics (83% average humidity), rain jacket and waterproof shoes (8.4 in of rain on average) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Ilha Grande
Planning Ilha Grande in December?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.