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Best Time for the Rio & the Costa Verde
Sweet spot: May, June, July — computed from NASA POWER climate normals across the route's overnight towns, balancing temperature, rainfall and daylight.
Post-summer sweet spot: warm sea, thinner crowds, and Paraty's lanes at their most photogenic.
Brazilian summer holidays plus afternoon downpours — Ilha Grande boats fill by mid-morning.
| Month | Temp | Rain | Daylight | |
|---|---|---|---|---|
| January | 17.5–35.4°C | 222 mm | 13.3 h | |
| February | 17.1–34.5°C | 174 mm | 12.8 h | |
| March | 17.3–33.1°C | 174 mm | 12.2 h | |
| April | 13.8–31.9°C | 98 mm | 11.5 h | |
| May | 11.8–30.8°C | 65 mm | 10.9 h | |
| June | 9.5–30.1°C | 45 mm | 10.6 h | |
| July | 9.9–30.8°C | 47 mm | 10.7 h | |
| August | 10.3–34.9°C | 40 mm | 11.2 h | |
| September | 10.6–36.2°C | 66 mm | 11.9 h | |
| October | 12.6–37.2°C | 117 mm | 12.6 h | |
| November | 13.9–34.8°C | 195 mm | 13.1 h | |
| December | 15.2–34.8°C | 216 mm | 13.4 h |