Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 73mm), mostly on Sat afternoon. Becoming colder with a light covering of snow ,mostly falling on Mon night. Freeze-thaw conditions (max 6°C on Sat morning, min -1°C on Mon night). Winds increasing (light winds from the S on Sun night, severe gales from the SSW by Mon night).

Mount Si Weather (Days 3-6):

A light covering of new snow mostly falling on Tue morning. Freeze-thaw conditions (max 9°C on Wed afternoon, min -1°C on Tue morning). Winds decreasing (gales from the SW on Tue morning, calm by Tue night).

This table gives the weather forecast for Mount Si at the specific elevation of 1270 m. Our advanced weather models allow us to provide distinct weather forecasts for several elevations of Mount Si. To see the weather forecasts for the other elevations, use the tab navigation above the table. For a wider overview of the weather, consult the Weather Map of Washington.