PORTLAND, Ore. (KOIN) -- The clouds are back Sunday morning, and light rain is spreading from the Oregon Coast into the Willamette Valley as a relatively weak system moves in off the Pacific.

Portland can expect about a quarter-inch of rain on Sunday -- but there is also some good news. The rain will be short-lived and should be exiting the valley no later than noon.

In fact, if you have plans for the second half of Sunday, you will likely see some sun breaks on this last full day of summer.

Temperatures will cool into the 70s after a Saturday where many locations in the valley saw temperatures in the 80s. • Futurecast for Sunday, September 21, 2025 (KOIN) • Futurecast for Sunday, September 21, 2025 (KOIN) • Forecast rain for Sunday, September 21, 2025 (KOIN) • Hourly planner fo

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