Portland/ Weather & Environment

Portland Forecast Turns Warmer Thursday as September Outlook Remains Uncertain

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Published on September 16, 2026
Portland Forecast Turns Warmer Thursday as September Outlook Remains UncertainSource: Google Street View

Tuesday morning's forecast includes possible low clouds and patchy fog in interior valleys, while Wednesday's forecast calls for upper-70s to low-80s temperatures in interior areas.

Sunny Wednesday Comes With Afternoon Gusts

The National Weather Service in Portland forecasts upper-70s to low-80s interior highs Wednesday. North-northeast winds will run 5 to 8 mph, with gusts reaching as high as 18 mph, so the afternoon may feel breezier in exposed spots.

The available outlook does not specify Portland's Wednesday-night temperature, wind, sky or precipitation details.

Thursday Looks Like The Week's Warmest Day

Thursday is expected to be the warmest day in the current forecast, with low-80s temperatures in interior areas and generally dry conditions.

The Friday-through-weekend forecast remains uncertain, with possible highs ranging from the low 70s to mid-80s, although the overall signal favors dry weather.

Cooler Pattern Arrives Early Next Week

The forecast remains uncertain through the weekend, and the available outlook does not provide Portland's Monday and Tuesday temperatures or sky conditions. It also does not specify whether a cooler pattern or rain chance will reach Portland early the following week.

That is a notable change from the wetter setup Portland was facing earlier in September, when Hoodline previously reported a much soggier weekend outlook. For now, the forecast remains generally dry, though details are uncertain.