Seattle is starting Monday, May 18 under mostly cloudy skies, but sunshine is on the way — the National Weather Service says an upper-level ridge parked right overhead will clear any morning fog and push afternoon temperatures to a pleasant 66°F with near-zero rain chances. Get outside today, Seattle. Bookmark the Seattle weather forecast for the rest of the week.
Today’s Setup
Morning low clouds and patchy fog will give way to mostly sunny skies by late morning. North winds stay light at 1 to 6 mph — no excuses to skip the walk around Greenlake, a ride on the Burke-Gilman Trail, or a lunch stop at Pike Place Market. One note for folks further north: the National Weather Service is flagging breezy conditions through the Strait of Juan de Fuca tonight, with gusts up to 30 mph possible on Whidbey Island before easing later overnight.
Allergy Alert
Pollen counts run elevated on dry, sunny May days across the Puget Sound lowlands. Tree and grass pollen are both in season, so keep an allergy relief nasal spray close, especially if you’re spending time outdoors this afternoon. Running a HEPA air purifier at home overnight helps keep indoor air clean on high-pollen days. For yard work or a longer trail hike, a pollen count face mask is worth tossing in your pack. While you’re stocking up on outdoor supplies, check out outdoor gear deals — including a deal on UPF 50+ Fishing Shirts for $6.50 that’s worth grabbing for sun protection this week.
Mariners Gameday Weather: May 19–20
The Seattle Mariners host the Chicago White Sox at T-Mobile Park on Tuesday, May 19 and Wednesday, May 20. Both days look nearly identical: mostly cloudy, highs near 66°F, light winds, and no meaningful rain in the forecast. Tailgating in SoDo should be comfortable — bring a light jacket for the evening innings. Represent with a Seattle Mariners jersey and a Seattle Mariners fitted cap for the series. Still need seats? Get tickets on SeatGeek or Find tickets on StubHub before the series fills up.
What To Wear
Layer up for the morning — it’s a cool 48°F overnight — then swap to a T-shirt by midday. Sunglasses are a must for the afternoon. If you’re heading out to catch Kevin Morby at Neptune Theatre tonight (May 18) or The Phantom of the Opera at Paramount Theatre on Tuesday evening, the walk in will be pleasant.
Tonight’s Dinner
A sunny, mid-60s spring evening calls for a quick weeknight stir-fry loaded with seasonal vegetables — easy, fresh, and satisfying after a day spent outside. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door. Keep a Stanley quencher tumbler nearby so you’re staying hydrated while you cook.
Next Few Days
Tuesday and Wednesday stay mild with highs near 66°F and mostly cloudy skies. The National Weather Service notes weak disturbances could bring a few sprinkles midweek, but precipitation chances stay below 15% in the city — mostly a mountain story. Heading into the weekend, a low pressure system tracking down from the Gulf of Alaska could bring a wetter pattern change by Saturday or Sunday, so keep an eye on updates. If you’re planning to catch the Stifel Stars on Ice show at Climate Pledge Arena on May 23, that one’s indoors — grab a Stars on Ice - U.S. t-shirt and enjoy it completely weather-proof.
