Weather
Portland, OR Weather Update: 30% Rain Chance Oct 17
Portland, OR – A noticeable weekend weather change is approaching the Portland metropolitan area, where afternoon temperatures are expected to fall from the upper 70s to the mid 60s by Sunday, Oct. 18
By Caleb Mercer · 2026-10-15T10:13:08.317Z
Portland, OR – A noticeable weekend weather change is approaching the Portland metropolitan area, where afternoon temperatures are expected to fall from the upper 70s to the mid 60s by Sunday, Oct. 18. After two warm, sunny afternoons, increasing clouds, patchy fog and a chance of rain will arrive Saturday. The transition could bring damp pavement and reduced morning visibility to portions of the city before cooler conditions settle in. Another slight chance of rain is expected Monday as Portland moves into a more typical mid October weather pattern.
According to the National Weather Service in Portland, temperatures are expected to reach approximately 77 degrees Thursday, Oct. 15, and Friday, Oct. 16, before falling to 66 Saturday and Sunday. Saturday carries a 30% chance of rain before 11 a.m., while patchy fog is expected between 10 a.m. and noon. By Monday, Oct. 19, temperatures could fall to approximately 61 degrees, representing a 16 degree decline from the late week highs.
Sunday Brings Cooler Conditions Across Portland Sunday will mark the continuation of the weekend cooldown, with mostly sunny skies and temperatures reaching approximately 66 degrees. Although sunshine is expected, the afternoon will feel noticeably cooler than Thursday and Friday, when highs are forecast to reach 77 degrees.
The transition begins Saturday morning as a weak rain opportunity and patchy fog enter the forecast. The National Weather Service expects a 30% chance of rain before 11 a.m., followed by cloudy skies gradually becoming mostly sunny. Temperatures should reach around 66 degrees, an 11 degree decline from Friday.
Saturday night brings another change as skies become partly cloudy and temperatures fall to approximately 44 degrees. That will be considerably cooler than Thursday night's projected low near 56, giving residents a noticeable reminder that fall conditions are returning.
Morning Fog and Rain Could Affect Travel The changing weather may be particularly noticeable for residents traveling through Portland, Beaverton, Tigard and surrounding communities. Patchy fog Saturday morning could produce localized visibility reductions, while passing showers may leave pavement damp during portions of the morning.
Motorists using Interstate 5, Interstate 84, Interstate 205 and U.S. Highway 26 should remain attentive to changing visibility and road conditions. However, the supplied forecast does not identify widespread hazardous travel, flooding or weather related highway closures.
Thursday will feature east winds of 3 to 8 mph, with gusts potentially reaching 20 mph. Friday brings lighter easterly winds before calmer conditions develop Friday night as clouds increase.
For residents planning outdoor activities, Saturday morning presents the greatest chance of encountering unsettled weather during the weekend. Sunday appears more favorable for dry outdoor plans, although temperatures will remain substantially cooler than the preceding workweek.
Another Rain Chance Develops Monday The cooler weather pattern continues Monday, Oct. 19, when mostly cloudy skies and temperatures near 61 degrees are expected. A slight chance of rain develops after 11 a.m., although the National Weather Service has not specified a precipitation percentage or rainfall total.
Monday night remains mostly cloudy, with temperatures falling to approximately 45 degrees. Tuesday brings improving conditions, with mostly sunny skies and highs near 65 degrees.
Wednesday, Oct. 21, should remain mostly sunny, with temperatures reaching approximately 67 degrees as Portland experiences a modest warming trend.
No significant storms or widespread hazardous weather conditions are identified in the supplied forecast through Wednesday.
Will Portland's cooler weekend weather change your outdoor plans, or are you looking forward to the return of fall temperatures?
Five Day Weather Outlook Thursday 10/15: Sunny skies will bring afternoon temperatures near 77 degrees across Portland, with east winds of 3 to 8 mph and gusts potentially reaching 20 mph. Mostly clear conditions follow Thursday night, with temperatures falling to approximately 56 degrees.
Friday 10/16: Mostly sunny skies will continue as temperatures reach approximately 77 degrees, keeping conditions warm for mid October. Light easterly winds are expected, followed by increasing clouds Friday night and temperatures falling to around 52 degrees.
Saturday 10/17: A 30% chance of rain is expected before 11 a.m., with patchy fog possible between 10 a.m. and noon. Skies gradually become mostly sunny, with a high near 66 degrees and a nighttime low around 44.
Sunday 10/18: Mostly sunny skies will accompany cooler afternoon temperatures near 66 degrees, approximately 11 degrees below Friday's projected high. Mostly cloudy conditions develop Sunday night, with temperatures falling to around 45 degrees.
Monday 10/19: Mostly cloudy skies and a slight chance of rain after 11 a.m. will accompany temperatures near 61 degrees. Mostly cloudy conditions continue Monday night, with temperatures falling to approximately 45 degrees.
Extended Outlook Tuesday, Oct. 20, is expected to bring mostly sunny skies and afternoon temperatures near 65 degrees, followed by mostly clear conditions and a nighttime low around 45 degrees.
Wednesday, Oct. 21, should remain mostly sunny, with temperatures reaching approximately 67 degrees.