Seattle woke up cool and clear on Monday, June 1, with thermometers at Boeing Field sitting in the low 50s. Sunshine should hold all day for a mellow afternoon in the low 70s across the city, with highs near 72°F, before a sharper warm-up moves in Tuesday. Overnight lows stay mostly in the mid 50s, which will keep evenings comfortable, at least for now.
What To Expect
Monday stays mostly sunny with a light north breeze. The real heat arrives Tuesday, when temperatures climb to around 82°F in the city and into the mid to upper 80s farther inland away from Puget Sound. Daytime relative humidity is expected to drop to around 20 percent Tuesday, which means poor overnight cooling and a Minor to Moderate heat risk for some inland neighborhoods, according to the National Weather Service.
Heat Safety
Anyone sensitive to heat, or without reliable air conditioning, should try to avoid heavy outdoor work during the hottest part of the afternoon and drink plenty of water. The City of Seattle lists cooling locations, plus library and recreation center options, along with practical tips for staying safe. For most people, keeping outdoor plans shorter, sticking to the shade, or shifting activities to morning and evening hours will help take the edge off the heat.
Marine And Winds
By midweek the pattern flips as onshore flow strengthens and a weak front slides through, bringing breezier conditions across Puget Sound and along the coast Wednesday into Thursday. Small Craft Advisory-level winds are likely later in the week, with a 40 to 70 percent chance of gale-force gusts Thursday evening and seas generally in the 4 to 7 foot range, according to the National Weather Service. Boaters should keep an eye on updated forecasts and be ready for rougher conditions if heading out after midweek.
Outlook
After Tuesday’s peak, the heat backs off as clouds return by midweek. Light rain chances move in Friday into the weekend, with a likely wet Saturday and highs closer to the low 60s. The warm spell looks short-lived, and waterfront neighborhoods should slide back to more typical early June temperatures once the onshore flow takes over again.
