SeasonMapPortillo weather in September
Chile
September in Portillo: cold, a little rain, with clean air — a great time to visit.
#4 of 12 months in Portillo · #730 of 1383 destinations to visit in September · comfort 79/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Portillo in September
No notes yet. Open Portillo on the map to add the first one.
Portillo climate normals — September
| Daytime high | 4°C / 39°F | 🧥 cold |
|---|---|---|
| Nighttime low | -3°C / 26°F | |
| Feels like (high) | 3°C / 37°F | |
| Rainfall | 47 mm / 1.8 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 59% | 🍃 comfortable |
| Dew point | -8°C / 18°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 11.9 h | |
| Wind | 7 km/h / 4 mph | |
| Snowfall | 30.3 cm / 11.9 in | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Portillo in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyFiestas Patrias recess in Chile(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Portillo's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherPortillo's weather peaks June–August.
Best weatherFair weatherToughest weather
What's on in Portillo in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Closure
Access road shut by storms
1 Jun – 30 Sep · usuallyRiskThe hotel sits on the international road to Argentina and the pass closes whenever a big front arrives; 2026 saw it shut for 34 days. Guests already up there ski; getting in or out waits. Source ↗
- Season
Ski season
20 Jun – 5 Oct · usuallyA single hotel at 2,880 metres on a lake, open from late June to the start of October and shut the rest of the year. Late season can run into October when the snow holds.
- Rule
Saturday-to-Saturday ski weeks
20 Jun – 5 Oct · usuallyBook earlyThe hotel sells all-inclusive weeks, not nights: everyone arrives on Saturday and leaves the next, which is why the place feels like a boarding house. Shorter stays are the exception, not the rule. Source ↗
- Season
Snow season
Ski seasonAbout 30 cm of snow falls in the month.
from the climate normals
Nearby, and something's on
Within 300 km of Portillo — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Portillo?
Portillo in September — FAQ
- Is September a good time to visit Portillo?
- September in Portillo: cold, a little rain, with clean air — a great time to visit. It ranks #4 of 12 months for Portillo on SeasonMap's comfort score (79/100).
- What is the weather like in Portillo in September?
- In September, Portillo averages a daily high of 3.9°C and a low of -3.5°C, with about 46.6 mm of rain over roughly 6.4 rainy days.
- What is the air quality in Portillo in September?
- Portillo has a mean US Air Quality Index of about 50 in September.
- Does it snow in Portillo in September?
- Portillo sees roughly 30.3 cm of snowfall in September.
Other months in Portillo
Compare Portillo in September
Warmer or cooler than Portillo in September
Similar destinations in South America — September
Within 300 km: Valle Nevado's Ski season around 19 Jun – 5 Oct, and Santiago's Ski season around 14 Jun – 4 Oct.