Portland, OR – Patchy fog and rain will be the main challenges for Portland-area commuters and outdoor plans through Saturday, with brighter skies expected by Sunday. Low clouds could cut visibility along I-5 and I-84 during the morning drive Friday, and a round of showers is likely by Friday night.
According to the National Weather Service Portland office, patchy fog will form overnight into early Friday, holding temperatures in the mid-50s. Showers increase Friday evening with a 60 percent chance of rain, especially across Multnomah, Clackamas, and Washington counties. By Saturday, rain will be widespread with highs only in the mid-60s. A west-northwest wind near 5 mph will follow Saturday’s rain, making outdoor activities damp and cool.
Conditions improve by Saturday night as showers taper and skies partially clear. Sunday brings a sharp turnaround, with sunny skies and highs near 70, the best day of the weekend for outdoor events and travel. Clear nights early next week will allow temperatures to drop into the low 50s, a reminder that fall chill is setting in across the Willamette Valley.
Travelers should allow extra time for fog and wet pavement Friday and Saturday. DOT crews caution that reduced visibility could affect bridges and river crossings. Residents are encouraged to keep headlights on in fog, avoid sudden braking, and dress in layers to adjust to quick temperature swings.
Five-Day Forecast for Portland, OR:
Fri: 66/55 – Morning fog, partly sunny; showers likely late, especially north and west.
Sat: 65/50 – Showers most of the day; breezy west wind.
Sun: 70/48 – Sunny, dry; best outdoor day of the weekend.
Mon: 74/52 – Sunny, warmer; light winds.
Tue: 78/53 – Mostly clear, unseasonably warm afternoon.
