Seattle started Wednesday under clear skies and a comfortable 66°F at Boeing Field, but the cool vibe will not last long. Forecasters expect inland neighborhoods and the foothills to rocket into the upper 80s and around 90–91°F this afternoon, while shoreline areas hang out much closer to the marine air. With a Heat Advisory in place, it is a good day to run errands early or late and to check in on heat‑vulnerable neighbors and pets.
Afternoon Heat And Tonight's Risks
Wednesday, July 22 is on track for a high near 91°F, with north‑northwest winds around 2 to 8 mph and the strongest heating over the foothills and the Southwest Interior. The National Weather Service has a Heat Advisory up through 11 p.m. PDT Wednesday and also notes a Small Craft Advisory for parts of the Strait of Juan de Fuca this evening. Late Wednesday night into early Thursday, forecasters keep a chance of showers and isolated thunderstorms in play as the remnants of Tropical Storm Elida slide by offshore. Outdoor workers and anyone without reliable cooling should take extra precautions and shift heavy activity to the cooler parts of the day. NWS Seattle
Where It's Hottest
Inland spots from the Eastside through the central valleys and into the Cascade foothills are the most likely to hit the low 90s, while waterfront neighborhoods and areas hugging Puget Sound stay in the mid‑60s to low‑70s. Overnight lows only fall into the low to mid‑60s across much of the city, so warmer neighborhoods will not get much of a cooldown. If you live away from the water, plan on it feeling several degrees hotter than along the shoreline and time your outdoor plans with that in mind.
Cooling Options And City Guidance
The city and county maintain heat‑safety guidance and lists of cooled public spaces. Residents can call 2‑1‑1 for help with sheltering or use the city’s online heat resources for locations and hours. Without air conditioning, it is wise to camp out in libraries, community centers or other public cooling spaces during the midafternoon peak, sip extra fluids and never leave children or pets in vehicles, even for a quick errand. City of Seattle
Boaters And Late‑Night Showers
On the water, gusty winds and choppy seas may pop up this evening where marine advisories are posted, so it is a good idea to check the latest marine forecast before casting off. The pattern turns more onshore late Wednesday into Thursday, with a 20–30% chance of showers and a low chance of thunderstorms after about 3 a.m. Thursday. Any storms that do develop will be mainly high‑based but can still crank out brief lightning and bursts of heavy rain. Secure loose items outside and keep late‑night plans flexible.
More From Hoodline
For our earlier reporting on the midweek advisory and smoke, see our previous coverage on the midweek advisory and smoke.
