Portland’s forecast turns from a chilly Tuesday morning to a sunny warmup later in the week, followed by cooler weather and rain chances over the weekend. A Frost Advisory covering the area remains in effect until 8 a.m. Tuesday; the afternoon is forecast to be mostly sunny with a high near 64, according to the National Weather Service point forecast.
Warm days stand out against October’s seasonal backdrop
Wednesday is forecast to be dry and mostly sunny, with a high near 69 and a low around 52 that night. Sunshine and highs near 76 are expected Thursday and Friday. That warmth is notably above the seasonal context: the National Weather Service Portland climate book says highs typically return to the 60s by early to mid-October. The comparison puts this week’s forecast in context; a few warm days alone do not establish a longer-term climate trend.
Rain chances return this weekend
The forecast calls for a cooler Saturday, near 66, with light rain possible before 11 a.m. Sunday’s forecast high is near 65, with precipitation chances increasing early next week. Monday’s forecast high is near 59.
For the immediate cold, residents with vulnerable outdoor plants can cover them before the advisory expires Tuesday morning. Ahead of the later rain, Portland Bureau of Transportation advises clearing storm drains when possible. That is general maintenance guidance, not a forecast that flooding will occur.
