Seattle woke up clear and cool on Sunday morning, April 19, 2026, with temperatures near 46°F and a light north breeze. The warmup will be quick, and most lowland neighborhoods away from open water are expected to climb into the low 70s this afternoon, setting the stage for an easy day to get outside.
Afternoon Warmth
Mostly sunny skies should push highs to around 72°F across much of the city, with inland and more sheltered spots likely running a few degrees warmer. Winds stay on the calm side at about 2–7 mph from the north, and tonight looks to dip back to roughly 48°F under partly cloudy skies. Similar mild conditions hold into Monday before the pattern shifts. According to the National Weather Service Seattle, the warmest readings will show up in lowland areas away from the shoreline.
Midweek Rain Chances
An upper-level low moves inland Monday night into Tuesday, April 21, bringing increasing rain chances on Tuesday and a higher likelihood of more widespread light rain on Wednesday, April 22. Highs will drop back into the upper 50s to low 60s during this cooler, wetter stretch, and rainfall totals are expected to stay on the lighter side. Forecasters also flag a slight chance of a few rumbles of thunder over the Cascades on Tuesday as the system lifts north. According to the National Weather Service Seattle, parts of the region could see about a 50% chance of light rain on Tuesday.
Marine And Commute Notes
In the nearshore waters, seas will generally run 4–6 ft today, building slightly at times to around 5–7 ft. By Wednesday, outer coastal waters could see waves topping 10 ft, so mariners may want to factor that into their plans. There are no watches or warnings in effect, and routine travel and outdoor activities should proceed without major weather issues through Monday. For midweek outdoor events, it is wise to keep an eye on updated forecasts late Monday and Tuesday and have a dry backup plan ready.
