Cool, Mostly Sunny Weather Ahead for Portland
As September comes to a close, Portland, Oregon, is set to experience cooler-than-average temperatures with mostly sunny skies dominating the forecast. According to KATU (27 September 2026), daytime highs will remain in the 60s°F (15-20°C) range, with chilly mornings dipping into the upper 40s°F (8-9°C). Rain chances are expected to increase on Tuesday, September 29, and Wednesday, September 30, particularly along the coast and in the Cascades. However, the Portland Metro area and the Willamette Valley are likely to see only trace amounts of rain, if any. As October begins, weather models suggest drier conditions with partly sunny skies and temperatures in the mid-60s°F (18-19°C).