Arc 1800 7-Day Snow Forecast

Arc 1800 Long-Range Snow Forecast Updated today

ECMWF IFS

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Updated 20 September 2026 12:50 PDT

Long-Range Snow Forecast for Arc 1800

Long-range (14 to 45 days) from 20 September.

For Forecast detail, see below.

Arc 1800 Snow Forecast Highlights

When will there be fresh snow in Arc 1800?

Arc 1800 Snow Forecast Highlights - ECMWF IFS
Snowfall prediction at mid-mountain (8,251ft)
Next Snow?
There is no snow currently in the forecast for Arc 1800.
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Long-range Snow Outlook for Arc 1800

Snowfall

Snow Line

Max 67°F
Min 37°F

Snow unlikely

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Arc 1800 Long-Range (2 weeks+) Snow Forecast Outlook

Note :- Mountain weather is extremely dynamic; the forecast below will change. Any forecast snow may move forward or back in the forecast, and predicted snowfall depths will be revised in subsequent updates.

16 Day Weather and Snow Forecast for Arc 1800 from OpenMeteo(ECMWF IFS)
	Snow and Weather	Temp Town
Sun 20	Clear spells.	Max 67°F Min 40°F
Mon 21	Cloudy.	Max 63°F Min 43°F
Tue 22	Clear sky.	Max 64°F Min 43°F
Wed 23	Fair.	Max 62°F Min 41°F
Thu 24	Clear sky.	Max 59°F Min 40°F
Fri 25	Clear spells.	Max 60°F Min 37°F
Sat 26	Clear sky.	Max 66°F Min 41°F

No significant snowfall is forecast for this period.

This Snow Forecast for Arc 1800, France gives the predicted Snowfall and Freezing Levels for the next week.

The forecast snowfall depths given are the likely average accumulations for the Lower and Upper slopes. The actual snow depth in Arc 1800, on any given trail or itinerary, may be dramatically different, particularly if the snowfall is accompanied by high winds and/or varying air temperatures.

Snow Forecasts beyond two days ahead are subject to significant change and variable reliability.

Arc 1800 Snow Forecast updated at 12:50 PDT, next update expected 18:00 PDT.

Long-range ensemble forecasts for Arc 1800 will be available shortly.

What are Forecast Ensembles ? Multiple forecasts from running the same weather model with slightly different inputs. The prominent line (the 'control') is the model output from standard inputs, the thinner lines are the variations. Plotted together, they show a range of possible outcomes; the closer they are, the higher the confidence.

How to read Long Range Ensemble Forecasts

These forecasts are from ECMWF EC46, a long-range, low-resolution (area) model. They may not accurately reflect local conditions and should be read as area forecasts, indicating whether the coming weeks are likely to be warmer, colder, wetter, or drier than average.

What to look for?

Temperatures trending downward at the same time as precipitation spikes upward... means snow!

Lines close together indicate a high confidence, while wider spreads signal uncertainty.

France Accommodation (Apartments, Chalets, Hotels) Map

Snow Reliability

Arc 1800 enjoys reliable snow conditions, with an average snow depth of 150 cm during peak season and consistent snowfall throughout the winter. For the latest snow information, be sure to check J2Ski for up-to-date conditions.

Off-Piste Safety in Arc 1800

Before skiing or snowboarding off-piste in Arc 1800, you must assess the local snow conditions. Always check the local Avalanche Risk Level and ski with appropriate safety equipment.