Seattle woke up cool and partly cloudy Friday morning, with temperatures around 56°F at Boeing Field, but that calm, gray start is not sticking around for long. A fast warm-up is lined up for the weekend, and the National Weather Service has issued a Heat Advisory for the city starting at 11 a.m. on Sunday, June 14, and running through 5 a.m. on Tuesday, June 16. Highs will climb into the 80s across Seattle’s lowlands, with even hotter readings inland and only limited overnight relief. If you have outdoor plans, it is a good idea to shift strenuous activity to the morning or evening and make a cooling plan for anyone who is especially vulnerable.
What To Expect
Friday, June 12 will be mostly sunny with a high near 72°F, then temperatures bump up to about 79°F on Saturday, June 13. Sunday, June 14 is when the heat really shows up, with highs around 85°F in the city and upper 80s to low 90s inland. Monday, June 15 may bring the warmest readings of the stretch. Overnight lows are expected to stay in the mid 50s to low 60s, so many neighborhoods will not cool off much at night. These forecasts and the advisory come from the National Weather Service.
Heat Advisory And Impacts
The Heat Advisory covers the City of Seattle and warns of hot afternoons, roughly 85 to 90°F, and warm nights that increase the risk of heat related illness. Older adults, infants, and people without effective cooling face the greatest risk. The advisory is in effect from 11 a.m. Sunday, June 14 through 5 a.m. Tuesday, June 16. For cooling locations, daytime centers, and practical safety tips, see the City of Seattle.
How To Stay Cool
Try to limit heavy outdoor work to before 11 a.m. or after 6 p.m., drink plenty of water, and never leave children or pets in parked cars, even for a short time. Public libraries and community centers often serve as daytime cooling spaces, and you can call 2-1-1 for the latest shelter and day center information. Employers and organizers of outdoor events should build in frequent breaks, provide shaded rest areas, and keep an eye out for signs of heat exhaustion.
Outlook
The upper level ridge is expected to weaken by Tuesday as onshore flow returns, which should bring cooler, marine influenced conditions by midweek and drop highs back into the 60s and 70s. Winds will pick up along the coast and waterways later in the week, so boaters and shoreline planners should monitor marine forecasts. If you have outdoor plans next week, keep an eye on local updates as the pattern shifts back toward more typical Seattle weather.
