Seattle, WA Weather This Week: Persistent Rain, Slick I-5 Travel by Monday

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Slick roads
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Washington – Rain-slick streets shine under streetlights as low clouds press down across Puget Sound, signaling a wet and unsettled stretch ahead. The air feels mild for December, but the pattern favors steady rain and growing travel impacts.

Patchy fog fades this morning as clouds thin briefly, allowing temperatures to climb toward the upper 50s. That break is short-lived. According to the National Weather Service in Seattle, rain becomes more widespread later today and continues into Sunday, with roads staying damp and visibility reduced at times.

By Sunday evening, rain coverage increases and lingers into Monday. Winds strengthen as well. According to the National Weather Service, south winds could gust near 30 mph Monday, especially along exposed corridors and near the water. Rainfall totals increase steadily, creating ponding on roadways and slowing travel on I-5, I-90, and Highway 99.

Monday stands out as the most impactful day. Rain falls steadily from morning through evening, with temperatures near 58 degrees keeping conditions wet rather than wintry. While snow is not expected at lower elevations, cooler air arriving later in the week hints at a winter tease. Wet pavement combined with cooler nights raises early concerns for slick spots if temperatures dip closer to freezing later.

Residents should clear storm drains, secure loose outdoor items, and plan extra commute time Monday. Pedestrians should expect puddles and reduced visibility during heavier showers. Travelers heading out early should keep headlights on and watch for sudden slowdowns.

Rain continues into Tuesday and Wednesday, with highs sliding into the upper 40s. The persistent moisture reinforces a classic December pattern across western Washington: mild air, frequent rain, and gradual cooling.