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Best time to visit · Brazil
On the climate data, the best time to visit Ilha Grande is June – August, scoring up to 89/100 with highs around 80°F (26°C) and 1.5 in (39 mm) of rain in August. May and September are good shoulder-season months. The toughest months are December & January, mainly because of rain.
Highs run from 78°F to 86°F across the year, and the yearly total is about 58.1 in (1475 mm) of rain.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 86°F30°C | 86°F30°C | 84°F29°C | 82°F28°C | 79°F26°C | 78°F26°C | 78°F25°C | 80°F26°C | 82°F28°C | 83°F28°C | 83°F28°C | 85°F29°C |
| Avg low | 75°F24°C | 75°F24°C | 74°F24°C | 72°F22°C | 67°F20°C | 66°F19°C | 64°F18°C | 64°F18°C | 66°F19°C | 69°F20°C | 70°F21°C | 73°F23°C |
| Rain | 8.9 in227 mm | 7.2 in184 mm | 7.0 in177 mm | 4.0 in101 mm | 2.5 in64 mm | 1.7 in44 mm | 1.9 in47 mm | 1.5 in39 mm | 2.6 in66 mm | 4.7 in120 mm | 7.6 in192 mm | 8.4 in214 mm |
| Humidity | 83% | 83% | 84% | 84% | 82% | 81% | 78% | 76% | 76% | 79% | 82% | 83% |
| Cloud | 72% | 61% | 62% | 55% | 57% | 53% | 49% | 50% | 64% | 72% | 76% | 71% |
| Comfort | 42 | 51 | 54 | 70 | 79 | 84 | 87 | 89 | 79 | 65 | 53 | 47 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. Temperatures were adjusted from the grid cell's ~438 m (1,437 ft) to Ilha Grande's ~6 m (20 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
Temperatures barely move through the year in Ilha Grande (highs stay between 78°F and 86°F), so rain is what really separates the seasons.
Expect steady highs of 78–82°F (25–28°C). It's the driest half, with only about 14.2 in (361 mm) of rain, 24% of the year's total. April – September feel humid, with humidity near 84%. Comfort peaks here: June – August rank with the year's best, and the season averages 81/100.
Temperatures hold fairly even, with highs of 83–86°F (28–30°C). It's the wettest half, with about 43.9 in (1114 mm) of rain, 76% of the year's total. October – March feel humid, with humidity near 83%. It holds the toughest stretch on our comfort score (December & January), averaging 52/100.
By comfort score: 5 Great, 2 Good, 4 Fair and 1 Tough. Great months: May – September. Tap a month for its own guide.
On the climate data, the best time to visit Ilha Grande is June – August, scoring up to 89/100 with highs around 80°F (26°C) and 1.5 in (39 mm) of rain in August. May and September are good shoulder-season months. The toughest months are December & January, mainly because of rain.
January is the wettest month, averaging about 8.9 in (227 mm) of rain. August is the driest, with about 1.5 in (39 mm). The yearly total is around 58.1 in (1475 mm).
July is the coldest, with average lows of 64°F (18°C) and highs of 78°F (25°C). The warmest is January, with average highs of 86°F (30°C).
Yes for much of the year: humidity averages 81% annually, and year-round combine warmth with 75%+ humidity, which feels sticky.
The wettest three-month stretch is November – January, with about 24.9 in (633 mm) of rain combined. The driest stretch is June – August, with about 5.1 in (130 mm).
Poll the group on June – August dates, then plan the days, packing and costs together.
