Seattle, WA – Triple-digit heat indexes could make Seattle’s streets and transit corridors dangerous through Tuesday as the region faces an extreme heat warning. Emergency officials urge residents to limit time outdoors and watch for heat illness, particularly along busy travel corridors like Interstate 5.
According to the National Weather Service in Seattle, daily highs near 89 to 90 degrees will persist through at least Tuesday evening. The agency warns that overnight lows in the mid-60s offer little relief, leaving urban neighborhoods vulnerable to heat buildup. Cooling centers remain open across King County, and Metro Transit advises riders to carry water while waiting for buses.
The hottest stretch arrives Sunday and Monday, when downtown Seattle, Bellevue, and Tacoma could all see consecutive days near 90 degrees. Officials warn that vehicles left unattended can heat to lethal levels within minutes. Puget Sound Energy recommends reducing energy use in the late afternoon to avoid strain on the power grid.
Drivers on I-5, Highway 99, and SR 520 may encounter pavement buckling or increased risk of vehicle overheating. Experts recommend checking coolant levels, carrying extra water, and avoiding long drives during peak afternoon hours.
The heat wave should break gradually by Wednesday, though temperatures will remain above average into late week. More advisories may be issued if overnight temperatures fail to cool sufficiently.
Five Day Forecast for Seattle, WA
- Sunday: Mostly sunny, high near 89, low 66.
- Monday: Sunny, high near 88, low 64.
- Tuesday: Mostly sunny, high near 86, low 64.
- Wednesday: Mostly sunny, high near 84, low 62.
- Thursday: Mostly sunny, high near 83, low 62.
