Portland's forecast for Wednesday, Oct. 28, calls for showers becoming more widespread by late morning and thunderstorms possible through the afternoon. The high is near 57 degrees, with a 100% chance of precipitation; inland south/southwest winds are 10 to 15 knots, with gusts up to 25 knots before easing. Rainfall totals are expected to remain light. The National Weather Service Portland climate book notes that thunderstorms can occur in any month but are not common—a long-term climate observation, not a measure of this week’s storm risk. Wednesday night brings a 40% chance of more showers and a low near 40.
Rain expected Thursday
Thursday is expected to be rainy, with a high near 56. The same NWS climate book describes autumn fog forming on clear nights and sometimes persisting for several days. Showers remain possible Thursday night and Friday. Friday is expected to be partly sunny, with a high near 56 and a 50% chance of rain.
Halloween weekend trends drier
Saturday brings a low-to-moderate chance of precipitation, with little to no rain expected. Halloween night is expected to be mostly cloudy, with a slight chance of rain and a low around 39, so a jacket may be useful with a costume. Sunday through Tuesday look drier, with partly sunny skies, low rain chances and highs rising from the upper 50s to around 61.
For travel into the Cascades, the National Weather Service warns that colder air is lowering snow levels and that conditions at higher mountain passes could become hazardous. The pass outlook is separate from Portland’s milder, rainy forecast; check the National Weather Service Portland forecast discussion for details.
