By 11:35 a.m., Portland International Airport was at 64 degrees. Skies should turn mostly sunny, with a high near 75 degrees.
The dry spell is giving Portland a notably warm start to October. There are no weather advisories in effect.
Weekend Warm-Up Peaks Sunday
The forecast is notably warm for early October. Portland International Airport’s 1991–2020 normal high is 70 degrees on Oct. 4, compared with a Sunday forecast near 81 degrees—about 11 degrees above normal. The airport’s daily normals show the seasonal cooling that typically arrives at the start of the month. NWS climate records list the Oct. 4 normal, while the Portland forecast calls for Sunday’s 81-degree high.
Friday should be sunny, with a high near 75 degrees. Saturday is forecast to be sunny with a high near 78 degrees, followed by a sunny Sunday reaching 81 degrees.
The weekend's late-summer feel echoes an earlier Hoodline forecast, which predicted about 80 degrees Sunday and described the rest of the week as largely dry.
Foggy Mornings Could Precede Sunny Afternoons
The weekend outlook pairs cool mornings with sunny afternoons.
The warm-up comes with a chance of patchy fog in inland valleys, especially in the morning. Clearer nights, light winds and a temperature inversion can help fog form and reduce visibility, potentially affecting travel; forecasters note that developing offshore winds may limit its coverage in some areas. The fog’s location remains uncertain, so conditions may vary across the region. The National Weather Service’s Portland forecast discussion outlines the fog and visibility risk.
Winds around Portland are expected to remain generally light, though exposed terrain and the western Columbia River Gorge could see stronger gusts as offshore flow develops Saturday and Sunday. For most city neighborhoods, the bigger planning note is simple: cool mornings, warm afternoons and plenty of sun.
Looking Ahead to Next Week
Monday is expected to be mostly sunny, with a high near 76 degrees.
