Peruvian Amazon (Iquitos) has no ideal window. No month clears the bar for comfortable travel outright, but Jun–Sep comes closest — rated fair rather than too hot, too cold or too wet.
Hot & wet year-round
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 28.5 | 83 | 67% | Too wet |
| February | 28.7 | 84 | 69% | Too wet |
| March | 28.5 | 83 | 72% | Too wet |
| April | 28.3 | 83 | 69% | Too wet |
| May | 28.0 | 82 | 64% | Too wet |
| June | 27.7 | 82 | 57% | Fair |
| July | 28.0 | 82 | 48% | Fair |
| August | 28.8 | 84 | 45% | Fair |
| September | 29.3 | 85 | 49% | Fair |
| October | 29.3 | 85 | 60% | Too wet |
| November | 28.9 | 84 | 63% | Too wet |
| December | 28.6 | 83 | 67% | 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 45% of days and daytime highs near 28.8°C (84°F). March is the wettest, at 72%. Temperature barely moves all year — just 1.6°C between the warmest and coolest months — so rainfall, not heat, decides when to go. The record rules out too wet in Oct–May.