Arequipa weather in September
September in Arequipa: nice, dry, with clean air — one of the best months to visit.
#1 of 12 months in Arequipa · #1 of 897 destinations to visit in September · comfort 97/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Arequipa in September
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Arequipa climate normals — September
| Daytime high | 24°C / 74°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 49°F | |
| Rainfall | 1 mm / 0 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 30% | 🌵 dry |
| Dew point | -3°C / 27°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Arequipa in September — FAQ
- Is September a good time to visit Arequipa?
- September in Arequipa: nice, dry, with clean air — one of the best months to visit. It ranks #1 of 12 months for Arequipa on SeasonMap's comfort score (97/100).
- What is the weather like in Arequipa in September?
- In September, Arequipa averages a daily high of 23.6°C and a low of 9.3°C, with about 1 mm of rain over roughly 0.2 rainy days.
- What is the air quality in Arequipa in September?
- Arequipa has a mean US Air Quality Index of about 34 in September.