Historical weather data, all-time temperature records, and monthly climate averages for Portland, OR. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Portland sits squarely in the gray zone — a 60% chance of rain with average temps in the low 40s to high 50s. The date has swung from a balmy 76° in 1990 down to a frosty 33° in 2009, so don't put the layers away just yet.
Portland's weather has real teeth at the extremes: the city baked at a stunning 114° during the June 2021 heat dome, then has also seen a bitter 8° back in February 1989. A single October day in 1994 dumped 3.2 inches of rain, a reminder that when fall arrives, it means business.
Summer is the clear window for travel — highs hover around 80° from late July into August, with the driest stretch of the year. If you're dodging rain, avoid mid-November through January, when weekly precipitation regularly tops 1.9 inches and highs barely crack the mid-40s.