A series of storm systems is set to bring colder temperatures, gusty winds, heavy rain, and significant mountain snowfall across western Washington this week, with forecasters warning that the most widespread impacts are expected as a powerful system moves through the region.

Multiple storm systems are expected to sweep across western Washington this week, bringing colder temperatures, gusty winds, rain and heavy mountain snow, with the most widespread impacts forecast.

According to King5 website, rain spread across western Washington as a cold front moved through the region, with snow levels expected to drop to around 3,000 feet as colder air arrives.


Colder air moving in Monday(March 9) and Tuesday is expected to maintain unsettled conditions, increasing the chances of a rain-and-snow mix in lowland areas, mainly overnight and early morning.

Warmest winters

According to the Weather Channel website, the 2025–2026 winter was the warmest on record in much of the Western US, with many areas seeing their hottest winter in 131 years, while the contiguous US ranked second-warmest.

Overnight lows are forecast near freezing, with daytime highs climbing into the 40s.

Snowfall could bring a few inches in the foothills and light, brief accumulations under an inch below 500 feet.

A stronger storm system is forecast to arrive Tuesday night and continue into Wednesday, prompting a Winter Storm Watch from late Tuesday night through Friday morning.

Lowland areas can expect increasing rain, potentially heavy at times, especially Wednesday, with wind gusts of 30 to 40 mph making travel more difficult. Mountain regions will continue to see heavy snowfall, with snow levels rising to 2,500–3,000 feet.

Some communities may experience a mix of rain-and-snow or short bursts of wet snow, though widespread lowland disruptions are not expected.