SeasonMapCourmayeur weather in September
Italy
September in Courmayeur: nice, rainy, with clean air — not the best time to visit.
#9 of 12 months in Courmayeur · #1339 of 1383 destinations to visit in September · comfort 22/100 (tier F)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Courmayeur in September
Other months in Courmayeur
Courmayeur's forum flags January weather as genuinely volatile given its elevation and mountain setting — regulars say it's not unusual for conditions to shift substantially within the same day. Weekends bring day-trippers up from Milan for the Aosta Valley resorts, and the nearby Cogne and Rhêmes valleys are singled out for excellent cross-country skiing if the downhill slopes get crowded.
Add your own note from Courmayeur's card on the map.
Courmayeur climate normals — September
| Daytime high | 18°C / 65°F | 😎 nice |
|---|---|---|
| Nighttime low | 10°C / 49°F | |
| Feels like (high) | 18°C / 64°F | |
| Rainfall | 81 mm / 3.2 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 6 km/h / 4 mph | |
| Snowfall | 8.7 cm / 3.4 in | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Courmayeur 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.
Peak crowdsTor des Geants, Summer holidays in Italy, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Courmayeur'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 weatherCourmayeur's weather peaks December–February, best around January.
Best weatherFair weatherToughest weather
What's on in Courmayeur in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Tour du Mont Blanc season
20 Jun – 20 Sep · usuallyTrail seasonBook earlyThe refuges on the Italian side of the circuit staff up once the cols clear, usually from late June. Beds on the route are the constraint and they go months ahead.
- Festival
Tor des Geants
8–20 Sep · usuallyMajor festivalCrowdedThe three-hundred-kilometre loop of the Aosta Valley starts and finishes here in mid-September, and for a week the high refuges are full of runners rather than walkers. Source ↗
Nearby, and something's on
Within 300 km of Courmayeur — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Courmayeur?
Courmayeur in September — FAQ
- Is September a good time to visit Courmayeur?
- September in Courmayeur: nice, rainy, with clean air — not the best time to visit. It ranks #9 of 12 months for Courmayeur on SeasonMap's comfort score (22/100).
- What is the weather like in Courmayeur in September?
- In September, Courmayeur averages a daily high of 18.4°C and a low of 9.5°C, with about 80.6 mm of rain over roughly 13.2 rainy days.
- What is the air quality in Courmayeur in September?
- Courmayeur has a mean US Air Quality Index of about 38 in September.
- Does it snow in Courmayeur in September?
- Courmayeur sees roughly 8.7 cm of snowfall in September.
Other months in Courmayeur
Warmer or cooler than Courmayeur in September
Similar destinations in Southern Europe — September
Within 300 km: Chamonix's High mountain huts open around 15 Jun – 20 Sep, and Val d'Isère's Col de l'Iseran opens around 10 Jun – 2 Nov.