Pacific Northwest Weather Alert: Showers and Thunderstorms Early Week With 10–15° Drop in Temperatures

MEDFORD, Ore. — A significant weather shift is headed for the Pacific Northwest as low pressure settles in Monday, bringing widespread showers, a chance of thunderstorms, and a sharp 10–15° drop in temperatures, according to the National Weather Service in Medford.

Showers and Thunderstorms Likely

Forecasters said showers will develop Monday and linger through Tuesday night, with 20–40% odds of embedded thunderstorms. Rainfall totals of ½ to ¾ inch are possible west of the Cascades, with lighter amounts expected across central and eastern Oregon.

“This system will feel more like late October than early September,” meteorologists explained.

Thunderstorm activity could bring lightning and isolated power flickers, prompting residents to keep devices charged and avoid outdoor activities during storms.

Impacts for Travelers

Commuters should prepare for slowdowns along Interstate 5 and Highway 97, where downpours could reduce visibility and create ponding on roads.

“Periods of heavy rain are likely during both morning and evening commute hours,” the NWS Medford office advised.

Localized flooding in low-lying areas remains a concern, particularly if thunderstorms repeatedly impact the same regions.

Temperature Drop Across the Region

Highs will drop sharply compared to recent days, settling in the 60s along the coast and Cascades, while the Rogue Valley is forecast to hold in the low 70s.

“Cooler air lingers through midweek, with showers tapering off by Wednesday,” forecasters said.

The system represents a major change from the summer-like warmth earlier this month, bringing conditions much closer to mid-autumn norms.

The Pacific Northwest will remain unsettled through at least midweek, with additional advisories possible if storm development increases. For more regional weather updates, visit ChicagoMusicGuide.com.