The best time to visit Southeast Brazil (Rio, Sao Paulo) is May–Sep. It is the only stretch of the year — 5 months — rated go on both daytime heat and rainfall.
Wet summers Dec–Mar
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 28.4 | 83 | 69% | Too wet |
| February | 28.8 | 84 | 56% | Fair |
| March | 27.9 | 82 | 64% | Too wet |
| April | 26.7 | 80 | 48% | Fair |
| May | 24.9 | 77 | 37% | Go |
| June | 24.5 | 76 | 28% | Go |
| July | 24.2 | 76 | 25% | Go |
| August | 24.8 | 77 | 27% | Go |
| September | 25.5 | 78 | 41% | Go |
| October | 26.3 | 79 | 48% | Fair |
| November | 26.4 | 80 | 67% | Too wet |
| December | 27.6 | 82 | 70% | Too wet |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
July is the driest month, with rain on 25% of days and daytime highs near 24.2°C (76°F). December is the wettest, at 70%. The warmest month is February at 28.8°C (84°F); the coolest is July at 24.2°C (76°F). The record rules out too wet in March, Nov–Jan.