Amazon (Manaus) has no ideal window. No month clears the bar for comfortable travel outright, but Jul–Sep comes closest — rated fair rather than too hot, too cold or too wet.
Wet most of year; drier Jun–Sep
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 28.7 | 84 | 86% | Too wet |
| February | 28.5 | 83 | 91% | Too wet |
| March | 28.4 | 83 | 90% | Too wet |
| April | 28.2 | 83 | 92% | Too wet |
| May | 28.2 | 83 | 88% | Too wet |
| June | 28.2 | 83 | 73% | Too wet |
| July | 28.7 | 84 | 57% | Fair |
| August | 30.4 | 87 | 47% | Fair |
| September | 32.2 | 90 | 51% | Fair |
| October | 32.4 | 90 | 59% | Too wet |
| November | 31.2 | 88 | 68% | Too wet |
| December | 29.5 | 85 | 83% | 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.
August is the driest month, with rain on 47% of days and daytime highs near 30.4°C (87°F). April is the wettest, at 92%. The warmest month is October at 32.4°C (90°F); the coolest is April at 28.2°C (83°F). The record rules out too wet in Oct–Jun.