Portland/ Weather & Environment

Foggy Portland Labor Day Morning To Sizzle Into 85-Degree Midweek Heat

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Published on September 07, 2026
Foggy Portland Labor Day Morning To Sizzle Into 85-Degree Midweek HeatSource: Unsplash/ Miles Smith

Portland is starting Labor Day under cloudy skies and patchy fog, but the gray opening should give way to a mostly sunny afternoon. Temperatures will climb from the mid-50s to around 70 degrees, with little wind and almost no chance of rain.

Fog Burns Off Before Lunch

Patchy fog is expected to linger across the city before 10 a.m. Monday, followed by brighter skies through the afternoon. According to the National Weather Service in Portland, a light north-northwest breeze around 1 mph will keep conditions calm as the holiday warms up.

Monday night should be mostly clear, with temperatures dropping to about 54 degrees. That makes for a comfortable evening outdoors, though anyone staying out late may want a light layer once the afternoon warmth fades.

Sunshine And An 85-Degree Wednesday

The forecast turns warmer and brighter Tuesday, when Portland is expected to reach 79 degrees under sunny skies. Wednesday is the week's warmest day, with sunshine and a high near 85 before temperatures ease back to around 78 Thursday.

Cooler Friday With A Small Rain Chance

Friday brings a noticeable cooldown, with mostly sunny skies and a high near 70. A slight chance of light rain arrives late Friday night and could linger into Saturday, although Saturday should still be mostly sunny with a high near 71.

Sunday looks milder again, with mostly sunny skies and a high near 75. No land-based weather alerts are listed for the Portland area, leaving the main forecast story as a foggy holiday morning followed by several days of unusually reliable September sunshine.