The best time to visit Andes (Cusco, Machu Picchu) is May–Sep. Month by month, the verdicts rate Apr–Nov as comfortable on both daytime heat and rainfall — 8 months in all.
Dry season May–Sep; wet Nov–Mar
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 20.5 | 69 | 69% | Too wet |
| February | 20.3 | 69 | 71% | Too wet |
| March | 20.5 | 69 | 60% | Too wet |
| April | 21.0 | 70 | 24% | Go |
| May | 21.2 | 70 | 8% | Go |
| June | 20.8 | 69 | 4% | Go |
| July | 20.6 | 69 | 4% | Go |
| August | 21.5 | 71 | 6% | Go |
| September | 21.7 | 71 | 15% | Go |
| October | 21.9 | 71 | 37% | Go |
| November | 22.3 | 72 | 41% | Go |
| December | 21.1 | 70 | 64% | 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.
June is the driest month, with rain on 4% of days and daytime highs near 20.8°C (69°F). February is the wettest, at 71%. Temperature barely moves all year — just 2.0°C between the warmest and coolest months — so rainfall, not heat, decides when to go. The record rules out too wet in Dec–Mar.