Middle of the drier season · Weather & things to do
Ilha Grande in May
Ilha Grande cools off: highs slip to 79°F (26°C), from 82°F in April, with lows of 67°F (20°C) and about 2.5 in (64 mm) of rain.
It scores 79/100 for comfort, 4th of 12, which makes it a solid shoulder-season month.
- Avg high
- 79°F (26°C)
- Avg low
- 67°F (20°C)
- Rain
- 2.5 in (64 mm)
- Humidity
- 82%
- Cloud cover
- 57%
- Daylight
- ~10 h 53 min
- Comfort score
- 79/100 · Great
What May feels like
Days are warm, averaging 79°F (26°C).
Nights cool to an average low of 67°F (20°C).
Humidity averages 82%, so the air feels sticky and the heat feels stronger than the thermometer says.
Some rain is likely, about 2.5 in (64 mm) in the month, so pack for a shower or two.
Plan around May
May is shoulder season: good weather, a step below the best months (June – August).
- Comfort improves from 70/100 in April to 79/100.
- May sits inside the Apr – Jun, Sep – Nov window our Rio, Ilha Grande & Paraty route recommends.
What to pack for May
- Light, breathable clotheshighs average 79°F
- Quick-dry fabrics82% average humidity
- Packable rain jacket or umbrellaabout 2.5 in of rain
- Comfortable walking shoesmost picks involve some walking
What to do in Ilha Grande in May
With conditions on your side, the picks below favor time outside.
Lagoa Verde
Emerald cove on the west side of the island, good for snorkeling among fish.
Why now May scores 79/100 for comfort, good conditions for being outside.
Cachoeira da Feiticeira
Waterfall about 1.5 hours' walk from Abraão, with a pool for a cool swim.
Why now Highs near 79°F and 2.5 in of monthly rain make this an easy outdoor pick.
Lua e Mar
Beachfront restaurant on Abraão's sand, known for moqueca and fish with green banana.
Vila do Abraão
The island's main village of sand lanes, pousadas, a white church and boat docks.
Pico do Papagaio
982 m peak shaped like a parrot's beak, with a steep forest trail and wide views.
Why now One to do outside while the weather is on your side.
Nearby in May
- Paraty in May~35 mi · highs 81°F, 2.4 in rain · 1°C (2°F) warmer by day, about as wet
- Rio de Janeiro in May~65 mi · highs 77°F, 2.8 in rain · similar daytime temperatures, 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 May: quick answers
Is May a good time to visit Ilha Grande?
It's a good shoulder-season choice, scoring 79/100 against a best of 89 in June – August. Expect highs of 79°F (26°C) and 2.5 in (64 mm) of rain. May is inside the Apr – Jun, Sep – Nov window our Rio, Ilha Grande & Paraty route recommends.
How hot is Ilha Grande in May?
Average highs are 79°F (26°C) and average lows 67°F (20°C), making it the 3rd-coldest month by daytime highs.
Does it rain a lot in Ilha Grande in May?
Some: about 2.5 in (64 mm) of rain falls across May on average, the 4th-driest month of the year. The annual total is about 58.1 in (1475 mm).
What should I pack for Ilha Grande in May?
Bring light, breathable clothes (highs average 79°F), quick-dry fabrics (82% average humidity), packable rain jacket or umbrella (about 2.5 in of rain) and comfortable walking shoes (most picks involve some walking).
More on Ilha Grande
Routes in season in May
- Rio, Ilha Grande & Paraty Apr – Jun, Sep – Nov
Planning Ilha Grande in May?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.