Weather Mountain Masochist 100k 2026
Forecasts for a 600 UTMB Index runner, at their estimated passage time. Start Sat, 11/07 04:30 AM: Hazy sky, 43°F. Coldest: 36°F feels-like at Loop 1 (Aid) (Sat, 11/07 06:59 AM); warmest: 60°F at Reservoir 2 (Aid) (Sat, 11/07 12:18 PM). No notable rain forecast on the course. Gusts up to 30 mph at Start.
Hour by hour, from the start to the estimated finish
Local race times (America/New_York). This race does not publish its cut-off: the finish is estimated for a slow runner, so the last columns are indicative.
Section-by-section forecasts for Mountain Masochist 100k 2026, calculated at the estimated passing time: feels-like temperature, rain or snow, wind and thunderstorms. Three models — AROME (Météo-France), ICON (DWD) and ECMWF IFS — served from the finest to the farthest-reaching.
The weather for the entire race, by 4-hour slots, at the start and at each aid station — to know when rain arrives and which pass gets windy, whatever your pace.
Forecast, not guaranteed: in the mountains a model describes a grid of several hundred meters, not the slope you're on.
Weather data: Météo-France (AROME), DWD (ICON), ECMWF (IFS) — CC BY 4.0, via Open-Meteo