Portland wakes up cloudy and cool on Monday, March 16, 2026, with temperatures hovering near 46°F and a light shot at drizzle before 9 a.m. Once the low clouds lift, the sun is expected to take over by midday and boost highs into the mid-60s, around 67°F in many valley neighborhoods, for a springlike afternoon. South winds stay on the gentle side, so most outdoor plans are in good shape, although a light jacket will still feel smart. If you are eyeing a coastal escape, keep in mind the story turns more unsettled later in the week.
Afternoon And Tonight
Monday afternoon looks mostly dry, with light southerly breezes around 2 to 6 mph and highs near 67°F. Showers are forecast to redevelop late Monday night into early Tuesday, March 17, 2026, with overnight lows near 50°F and about a 50% chance of precipitation across the metro area. These timing and temperature details follow the local forecast from NWS Portland.
Midweek Rain Chances
Rain chances return on Tuesday, March 17, 2026, and linger through the rest of the week, although the heaviest bands are expected to track farther north. The coast and southwest Washington are favored for steadier rain, while much of Portland should see lighter amounts overall. Forecasters are calling for modest totals across the valley and only isolated impacts to roads and rivers. For more on the broader storm setup, check earlier coverage on days of dumping rain and rowdy south winds.
Marine And Boaters
Southerly winds are expected to strengthen Monday and Tuesday, building seas into the 8 to 11 foot range with gusts up to about 25 knots. Small craft advisories are posted for several coastal and Columbia River zones from Monday into Wednesday, March 18, 2026. Mariners are urged to avoid exposed waters and secure loose gear as swells and wind waves increase through midweek. Full advisory details appear in the marine statements from NWS Portland.
Plan Ahead
Expect a mixed bag this week, with sunny breaks traded off for periodic light showers. Keep an umbrella handy for errands on Tuesday and Wednesday, March 17 to 18, 2026, and plan for slick pavement during commute times. Most neighborhoods should see only light, on-and-off rain, while coastal and wind-exposed areas need to stay alert for gusty conditions and rougher seas. Before heading for the coast or making on-water plans, check the latest official forecast and advisories.
