Santiago weather in September
September in Santiago: nice, a little rain — a great time to visit.
#8 of 12 months in Santiago · #330 of 604 destinations to visit in September · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Santiago climate normals — September
| Daytime high | 17°C / 63°F | 😎 nice |
|---|---|---|
| Nighttime low | 5°C / 40°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 43 mm / 1.7 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 69% | 💧 humid |
| Dew point | 4°C / 40°F | |
| Sunshine | 9.8 h/day | |
| Daylight | 11.9 h | |
| Wind | 10 km/h / 6 mph | |
| Air quality (US AQI) | 96 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Santiago in September — FAQ
- Is September a good time to visit Santiago?
- September in Santiago: nice, a little rain — a great time to visit. It ranks #8 of 12 months for Santiago on SeasonMap's comfort score (79/100).
- What is the weather like in Santiago in September?
- In September, Santiago averages a daily high of 17.2°C and a low of 4.6°C, with about 43.1 mm of rain over roughly 7 rainy days.
- What is the air quality in Santiago in September?
- Santiago has a mean US Air Quality Index of about 96 in September.