Sunday’s outlook: Mild and calm
Seattle is experiencing a stretch of pleasant spring conditions today, Sunday, May 25, with filtered sunshine and dry weather throughout the afternoon. Highs are climbing into the upper 60s to low 70s °F (20–22 °C), creating an ideal day for outdoor activities. Expect some high-level cloud coverage, adding a soft filter to the sun.
As the evening progresses, light showers may develop along the Washington coast, and there’s a slight risk of isolated thunderstorms overnight, particularly along and east of the Cascade Mountains.
Memorial Day: Damp and cooler
Monday morning will begin with cloudy skies and light rain, especially along the Olympic Peninsula and coastal areas. The I-5 corridor, including Seattle, will see occasional drizzles, but nothing intense. There’s even a remote chance of lightning, though most areas will experience only intermittent rain.
As the day progresses, showers will taper off, retreating to the Cascade foothills, making room for sunshine to return in the afternoon. Temperatures will be cooler, peaking in the upper 60s °F (around 20 °C), offering a brief respite from heat.
Tuesday: Transitional warmth
Tuesday will bring partly sunny skies with a significant warmup. Highs are projected to reach the mid 70s °F (24 °C), setting the stage for a much more intense temperature spike midweek.
Wednesday: First major heat of the year
By Wednesday, the Pacific Northwest will enter its first true heatwave of 2025. A ridge of high pressure, easterly winds, and a thermal trough (a zone of dry, unstable air) will combine to create sweltering conditions across the region.
In Seattle, temperatures will soar to at least 86 °F (30 °C), with some neighborhoods possibly reaching 90 °F (32 °C)—the hottest temperatures recorded so far this year. For residents without air conditioning, this heat event could be intensely uncomfortable. Staying indoors with A/C and remaining hydrated will be key to weathering the heat safely.
Late week: A return to variability
By Thursday, light showers could make a brief return, though warmer and more stable weather is expected to resume by Friday and Saturday.
Keep an eye on weather updates this week as temperatures climb and conditions evolve quickly across Western Washington.
