Seattle is waking up warm and clear on Tuesday, June 23, with mid-morning temperatures already near 64°F and an afternoon high aiming for about 85°F. Inland neighborhoods and spots along the I-5 corridor are set to be the hottest, while coastal areas hang on to slightly cooler readings. Overnight lows only slip into the low 60s, which means not much relief for homes without air conditioning. Expect the most uncomfortable stretch in the late afternoon, roughly between 2-6 p.m.
Heat Advisory and the Week Ahead
The National Weather Service has a Heat Advisory in place through Wednesday, June 24, covering Seattle and much of the lowlands and flagging a combo of hot afternoons and warm nights. Forecasters are calling for highs near 85°F today and around 86°F on Wednesday before a shift to cooler, cloudier weather as a front works in late Thursday and brings a better shot at steady rain. The advisory urges extra caution for older adults, young children and anyone working outside, with reminders to take frequent breaks and stay hydrated. Full details are available from NWS Seattle.
Rain Arrives Late Thursday
Clouds start building on Thursday, with a chance of light rain after about 5 p.m., and rain becomes more likely Thursday night into Friday. Friday is on track for cloudy skies and highs in the mid 60s. Showers linger into Saturday, then conditions gradually improve by Sunday as highs rebound into the upper 60s. If you have outdoor plans lined up later this week, consider moving events indoors or at least keep a solid wet-weather backup plan for Thursday night and Friday.
Heat Safety and Local Cooling Options
During the hottest part of the day, simple steps go a long way: drink plenty of water, skip or scale back strenuous activity during peak sun hours, and never leave children or pets in parked cars, even for a short errand. For those who need a cooler place to be or other social services, call 2-1-1 or visit WA 211 to find daytime cooling locations and related resources. Check in on neighbors who might be vulnerable and be ready for a cooler, wetter change in the pattern by Friday.
Boating, Winds and Marine Notes
Boaters should be aware that small craft advisories are posted for parts of the coastal waters through early Thursday, and the National Weather Service is flagging a possible gale for the Strait of Juan de Fuca Wednesday night. Outer coastal waters will be on the choppy side, with swell around 7-9 feet into Wednesday night before conditions settle down. If you are heading onto the water, secure loose gear and keep an eye on marine forecasts and advisories from NWS Seattle.
