Portlanders who woke up to a cool, clear Sunday are getting one last taste of early-summer warmth before the holiday takes a hard left turn. Most inland neighborhoods are expected to race into the upper 70s and land near 80°F this afternoon, with plenty of dry sky to go around. Late tonight a sharp pattern shift moves in, and Monday, May 25, 2026, is on track to be wet, windy and much cooler. In other words, today is your prime window for outdoor plans that want warm sun without umbrellas.
Afternoon Heat, Coast Stays Chilled
High pressure is keeping the inland areas warm and dry for one more day while the coast hunkers under marine clouds and occasional drizzle. Inland highs this afternoon should top out in the upper 70s to near 80°F, but coastal spots will run roughly 15 to 20 degrees cooler. Tonight turns partly cloudy with lows in the mid 50s and light southwest winds.
Memorial Day Turns Wet And Windy
Rain showers are likely after 10 a.m. Monday, May 25, 2026, with a daytime high near 67°F that slips into the low 60s by afternoon, according to the National Weather Service Portland. Forecasters put the chance of precipitation around 90 percent Monday and say 24 hour totals could land between about 0.2 and 0.9 inches in the wettest coastal and mountain spots, while valley daytime amounts look closer to a tenth to a quarter inch. Winds will flip to the south southwest at 7 to 15 mph with gusts into the mid 20s, and the coast has the best shot at gusts topping 30 mph.
Marine And Boating Trouble Spots
A Small Craft Advisory is in effect from 11 p.m. Sunday into early Monday, and a Hazardous Seas Watch covers offshore waters from late Sunday night through Tuesday morning. Forecasters expect significant wave heights above 13 feet, with about a 25 percent chance of 17 to 19 foot seas around 20 nautical miles offshore and a smaller chance of 20 foot seas farther out. Small boats and ocean recreation operators are urged to avoid exposed waters. If you are planning to boat or play along the coast, secure loose gear, keep life jackets close and stay clear of exposed bar crossings while conditions remain dangerous.
Holiday Plans Need A Backup
If you have Memorial Day barbecues, picnics or campsites on the schedule, use Sunday to anchor tents and lock down canopies. Gusty winds and steady rain can easily flip or drag anything that is not secured. For local travel, expect wet roads Monday and a cooler afternoon. Build in extra time for trips and keep an eye on updated forecasts if you are heading to the coast or into the Cascades.
