PORTLAND, Ore. (KOIN) — Saturday will be one of our grayest days in the next seven.

An upper-level low drops south, which is part of an elongated trough. Saturday stays overcast, with a small chance for an isolated shower. If you’re heading to any weekend events, plan on that old-fashioned sweater weather with fall in the air.

The best chance for showers for Portland will be late Saturday night through early Sunday morning. After a trace to a few hundredths of an inch of rain, we’ll get onto a nice Sunday afternoon in the upper 70s.

Air quality advisory for parts of Oregon

A smoke air quality advisory has been issued by Oregon DEQ. This will be in effect through Monday afternoon for Deschutes, including the cities of Bend, Redmond, Sunriver, Sisters, La Pine and Brothers.

The Oregon Department of Environmental Quality has issued an Air Quality Advisory, in effect until 3 p.m. Monday. A Smoke Air Quality Advisory has been issued. Wildfires burning in the region combined with forecasted conditions will cause air quality to reach unhealthy levels. Pollutants in smoke can cause burning eyes, runny nose, aggravate heart, lung diseases and other serious health problems. Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition.

Air quality advisory remains in effect for central and southern Oregon through Monday night