Cusco weather in September
September in Cusco: nice, dry, with clean air — an excellent time to visit.
#4 of 12 months in Cusco · #30 of 604 destinations to visit in September · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Cusco climate normals — September
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 30 mm / 1.2 in | ☀️ dry |
| Rainy days | 10 days | |
| Humidity | 62% | 💧 humid |
| Dew point | 4°C / 40°F | |
| Sunshine | 10.7 h/day | |
| Daylight | 12 h | |
| Wind | 9 km/h / 6 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cusco in September — FAQ
- Is September a good time to visit Cusco?
- September in Cusco: nice, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Cusco on SeasonMap's comfort score (92/100).
- What is the weather like in Cusco in September?
- In September, Cusco averages a daily high of 17.6°C and a low of 7.5°C, with about 29.9 mm of rain over roughly 10 rainy days.
- What is the air quality in Cusco in September?
- Cusco has a mean US Air Quality Index of about 43 in September.