Best time to hike the Tour du Mont Blanc
Best: July–August. Also good: June and September.
The Tour du Mont Blanc is 166 km long, in 11 stages. Below is the average weather for every month at about 1,787 m, the middle height of the trail (975–2,535 m), from 10 years of daily data (2015–2024).
Weather month by month
| Month | High °C | Low °C | Rain mm | Rain days | Daylight h | Snow cm |
|---|---|---|---|---|---|---|
| January | −3° | −10° | 123 | 14 | 9.0 | 123 |
| February | −1° | −9° | 77 | 11 | 10.3 | 77 |
| March | 2° | −6° | 102 | 14 | 11.8 | 82 |
| April | 7° | −2° | 75 | 13 | 13.5 | 27 |
| May | 12° | 2° | 129 | 20 | 14.9 | 13 |
| June | 16° | 7° | 117 | 18 | 15.7 | 0 |
| July | 19° | 9° | 86 | 13 | 15.4 | 0 |
| August | 19° | 8° | 90 | 13 | 14.1 | 0 |
| September | 15° | 5° | 90 | 13 | 12.5 | 1 |
| October | 11° | 1° | 103 | 14 | 10.8 | 8 |
| November | 4° | −4° | 105 | 14 | 9.4 | 71 |
| December | 0° | −7° | 129 | 14 | 8.7 | 122 |
Higher up it is colder: about 6 °C less for every 1,000 m of height. The highest point of the trail is 2,535 m.
Season notes from our guide
The season is short: roughly mid-June to mid-September, when most refuges are open. Snow can lie on the high passes until early July, and the first autumn snow can come in September. July and August are the busiest months, and refuges are often fully booked for them months ahead. Late August also brings the UTMB trail-running races, which use the same paths and fill accommodation in Chamonix and Courmayeur.
Stages, map, elevation profile, places to stay and emergency help, free.
Read the full Tour du Mont Blanc guideHike it with Outest
Offline maps, stages and places to stay on your phone.
Best time for other trails
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Weather: NASA POWER (MERRA-2 reanalysis), daily values 2015–2024 near 45.87, 7.05, adjusted to 1,787 m. Rain days: days with at least 1 mm. Daylight: sunrise to sunset on the 15th of the month.