Portland, OR – Thunderstorms could disrupt outdoor plans across Oregon this weekend as unsettled September weather builds into the Portland metro. Storm chances begin late Friday and extend into Saturday afternoon, creating travel risks and possible game delays for weekend football events.
According to the National Weather Service in Portland, a 20 percent chance of showers and thunderstorms begins Friday night, mainly after 8 p.m. Clouds and scattered storms could impact drivers on I-5 and surrounding highways, with brief downpours reducing visibility. Saturday brings a higher 30 percent chance of rain, with thunderstorms possible after 2 p.m.
Daytime highs will dip into the upper 70s by Saturday, a shift from Friday’s near-85-degree heat. Sunday offers partial relief, though lingering clouds and a 20 percent chance of showers late will keep the pattern unsettled. Conditions grow wetter Monday, when showers and isolated thunderstorms are likely.
Residents should plan around possible lightning and wet roads. Those attending outdoor games or events are urged to monitor sky conditions and have indoor shelter options ready. Drivers should slow down on slick highways, especially I-5 through Portland and surrounding counties, where sudden rain may cause pooling water.
Rain chances remain in place into midweek, with cooler highs in the low 70s signaling the return of a fall-like pattern across the Willamette Valley.
Five Day Forecast for Portland, OR
- Saturday: Chance of showers and storms after 2 p.m. High near 79.
- Sunday: Partly sunny, slight chance of evening showers. High near 77.
- Monday: Showers likely with a possible thunderstorm. High near 71.
- Tuesday: Cloudy with showers likely. High near 72.
- Wednesday: Continued showers. High near 70.
