Portland, Oregon – A mild Friday in Portland will mark the last calm before a summer heat surge, with temperatures spiking toward the 90s by Monday.
According to the National Weather Service, Portland will see clearing skies Friday with a high of 74°F and light, variable wind. This marks the start of a rapid warm-up through the weekend, with sunny skies and rising temperatures expected across the Willamette Valley.
Saturday will feel seasonably warm with a high near 79°F, but the real heat arrives Sunday as the mercury hits 88°F. Monday tops out near 91°F — triggering a summer weather alert for residents along I-5 and surrounding areas. Stay hydrated, limit outdoor activity during peak hours (1–5 p.m.), and check on neighbors without AC.
Travelers should be aware of heat-sensitive road conditions, especially on I-5 south of Portland, where surface temperatures can soar above 120°F by afternoon. Outdoor events, farmers markets, and trail use should be scheduled for mornings or evenings to avoid the heat.
This dry, sunny stretch follows a brief chance of drizzle Thursday morning, after which skies stayed mostly cloudy. No rain is expected over the next five days.
Warming continues through early next week, with little overnight relief as lows stay near 60°F.
🌤️ Five-Day Portland, OR Forecast: June 27–July 1
- Friday: Decreasing clouds, high 74°F. Light wind.
- Saturday: Sunny, high 79°F.
- Sunday: Sunny, high 88°F. Summer heat alert.
- Monday: Sunny, high 91°F. Hot and dry.
- Tuesday: Mostly sunny, high 86°F.
