When To Go · Destination Guide
Ilha Grande And Agra Dos Reis Brazil
Rainforest islands, reef dives, and beach-hike days on Brazil's Costa Verde
Updated Jan 23, 2026 • 21 sources
When To Go
Season planner for Ilha Grande and Angra dos Reis
Costa Verde is diveable year-round, but conditions swing with rainfall and cold fronts. Summer (roughly Dec to Mar) is warmer in and out of the water, but heavier rain and runoff can reduce visibility and cancel boats during thunderstorms. Winter (Jun to Aug) is usually drier and better for hiking, while water temperatures can feel cooler. Shoulder months (Apr to May and Sep to Nov) often offer the best balance for mixed dive-and-hike trips.
At A Glance Heatmap
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | ||||||||||||
| Scuba | ||||||||||||
| Freedive | ||||||||||||
| Snorkel | ||||||||||||
| Topside |
Activity Drilldowns
OverallMay to September·Crowd:High·Cost:Premium
Ideal: Drier weather for hiking and steadier boat days; water often cools to around 20°C to 22°C.
Plan Carefully: Hotter and wetter with thunderstorms; heavy rain can reduce visibility and cancel boats.
Brazilian summer holidays (late Dec and January) bring peak demand and higher prices.
ScubaApril to November·Crowd:Moderate·Cost:Moderate
Ideal: More stable conditions and better odds of clear water; visibility often 10 m to 20 m.
Plan Carefully: Warm water 24°C to 28°C, but rain and runoff can drop visibility to 5 m to 10 m.
If you are chasing offshore sites, build in schedule slack so your operator can choose safe days.
FreediveOctober to May·Crowd:Moderate·Cost:Moderate
Ideal: Warmer water for longer breath-hold sessions; choose calm mornings and protected coves.
Plan Carefully: Cooler water and more cold fronts; bring a thicker suit and prioritize sheltered sites.
Visibility drives freedive quality.
SnorkelDecember to April·Crowd:High·Cost:Premium
Ideal: Warm water and long days; good for boat tours and swim stops if storms stay away.
Plan Carefully: Cooler water and periodic swell; snorkel in protected coves and bring a rashguard or thicker suit.
For family snorkeling, prioritize sheltered stops and avoid afternoons when wind chop increases.
TopsideMay to September·Crowd:High·Cost:Premium
Ideal: Cooler, drier hiking weather with clearer viewpoints.
Plan Carefully: Hot, humid, and wetter; trails are slippery and bugs are more active.
Sunrise hikes (like Pico do Papagaio) are best in cooler months when the climb is more comfortable.
Seasonal Callouts Timeline
Humpback whale migration (offshore sightings)
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecOn some years, boat trips and offshore dives along the Costa Verde corridor may spot humpback whales. Keep distance, reduce speed near wildlife, and follow captain instructions.
Sea turtle encounters
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecTurtles are a year-round possibility around rock reefs and calmer coves. Give them space and avoid chasing them for photos.
Warm-water juvenile fish season
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecWarmer months often bring more juvenile reef fish in the shallows. Visibility can be reduced after heavy rain, so choose rocky sites.
Dry-season thru-hike windows for Volta da Ilha Grande
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecMulti-day hikes around the island are more comfortable in the cooler, drier months. Confirm trail conditions locally and carry rain protection anyway.
Reveillon and peak holiday travel
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecLate December and January bring the biggest crowds and the highest prices. Book boats, pousadas, and transfers early.
Carnival side-trip energy in Rio
JanJanFebFebMarMarAprAprMayMayJunJunJulJulAugAugSepSepOctOctNovNovDecDecMany travelers combine Costa Verde with Rio during Carnival season. Expect higher prices and limited last-minute transport options.