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Detailed cycling weather forecast for Col de l'Iseran. See wind direction, temperature and rain along the entire climb and descent.
✗ Closed
Pass Information
2,770m
Elevation
Current status:
unknown
Opening Period:
Wintersperre
Current Conditions
Could not reliably identify pass 'Col de l'Iseran' in Savoie external list.
Wed
11 Mar
ac_unit
Snow showers
06:51
—
18:31
-5°
/
-7°
Precipitation
2 mm
Humidity
100 %
📅 Opening & closing pattern (typical year)
Typical schedule (weather-dependent):
- Closed: mid-Nov → early June
- Opens: usually early June (often first Friday of June).
- Fully open season: June → October.
- Closes: typically early November or earlier if snow arrives.
Recent examples:
- Closed Oct 23 2025 after snowfall.
- Opened June 6 2025.
Why so late?
- Snow walls can reach 8–10 m in places before opening.
🌦 Seasonal cycling conditions
❄ Winter (Nov–May)
- Road completely closed for safety.
- Deep snowpack and avalanche risk.
- Only skis / mountaineering access.
👉 Cycling: impossible.
🌱 Spring (late May–June)
- Snow clearing takes weeks.
- Early June opening typical.
- Snowbanks often still visible until early July.
👉 Cycling:
- Early season = cold summit temps + melting snow runoff.
- Best for experienced alpine riders.
☀ Summer (late June–Sept)
- Prime season: clear roads + stable weather.
- Pleasant summit temperatures compared to valleys.
- Expect traffic (cars + motorcycles) especially July–Aug.
👉 Cycling:
- Best window = late June → early September
- Ideal combination of safety, scenery, and services open.
🍂 Autumn (Sept–Nov)
- Snow can fall from September onward.
- Pass may close earlier than planned if snowfall hits.
👉 Cycling:
- September = beautiful + quieter.
- October = risky (possible sudden closure).
🌡 Temperature reality at the top
Even during heatwaves in the valleys:
- Summit temperature is often cool — warm clothing recommended.
Expect:
- Rapid weather changes
- Strong winds
- Large temperature drop from valley to summit (often 10–20 °C difference typical for high Alpine passes).
🚴 Practical expectations for cyclists
Difficulty factors (year-round characteristics):
- Very high altitude → thin air + reduced power output.
- Long sustained climbs (e.g. ~17 km / ~900 m ascent from Val d’Isère).
- Exposure above tree line → wind + UV.
✔ Short summary
Col de l’Iseran is rideable only ~4–5 months per year.
Best cycling window = late June → early September.
Outside that:
Best cycling window = late June → early September.
Outside that:
- Winter: closed, buried in snow.
- Spring: opening depends on snow clearing.
- Autumn: can close anytime after September snowfall.
👉 If you want safe, predictable conditions — aim for July or early September.
Check weather on own route
Location
Weather Forecast
Next 7 Days
Wed
11 Mar
ac_unit
Snow showers
06:51
—
18:31
-5°
/
-7°
Precipitation
2 mm
Humidity
100 %
Thu
12 Mar
ac_unit
Snow showers
06:49
—
18:33
-3°
/
-8°
Precipitation
4 mm
Humidity
100 %
Fri
13 Mar
cloud
Overcast
06:47
—
18:34
-3°
/
-6°
Precipitation
0 mm
Humidity
86 %
Sat
14 Mar
ac_unit
Snow showers
06:46
—
18:35
-5°
/
-12°
Precipitation
22 mm
Humidity
98 %
Sun
15 Mar
ac_unit
Snow showers
06:44
—
18:37
-4°
/
-13°
Precipitation
26 mm
Humidity
100 %
Mon
16 Mar
foggy
Fog
06:42
—
18:38
-4°
/
-8°
Precipitation
0 mm
Humidity
100 %
Tue
17 Mar
cloud
Overcast
06:40
—
18:39
0°
/
-7°
Precipitation
0 mm
Humidity
74 %
Climate Overview
Climate Overview
| Month |
Temp Day
|
Temp Night
|
Sunny Days
|
Sun Hours
|
Rain Days
|
Precipitation
|
Humidity
|
UV Index
|
Day Length
|
|---|---|---|---|---|---|---|---|---|---|
| Jan | -7°C | -14°C | 15 | 5.5h | 23 | 170 mm | 75 % | 2 | 9h 11m |
| Feb | -5°C | -13°C | 21 | 7.5h | 11 | 33 mm | 73 % | 3 | 10h 24m |
| Mar | -5°C | -12°C | 23 | 8.7h | 14 | 82 mm | 70 % | 4 | 11h 57m |
| Apr | -1°C | -7°C | 24 | 9.5h | 14 | 278 mm | 68 % | 5 | 13h 32m |
| May | 1°C | -5°C | 29 | 11.7h | 16 | 63 mm | 65 % | 6 | 14h 55m |
| Jun | 12°C | 3°C | 29 | 13.7h | 21 | 75 mm | 67 % | 7 | 15h 36m |
| Jul | 9°C | 2°C | 31 | 13.1h | 24 | 60 mm | 66 % | 8 | 15h 15m |
| Aug | 11°C | 3°C | 30 | 12.3h | 14 | 57 mm | 68 % | 7 | 14h 2m |
| Sep | 7°C | -1°C | 25 | 10.0h | 18 | 85 mm | 70 % | 5 | 12h 30m |
| Oct | 2°C | -4°C | 20 | 7.2h | 16 | 159 mm | 72 % | 4 | 10h 55m |
| Nov | -4°C | -11°C | 20 | 6.4h | 12 | 80 mm | 76 % | 2 | 9h 31m |
| Dec | -6°C | -11°C | 18 | 5.7h | 18 | 86 mm | 77 % | 2 | 8h 46m |