MEDFORD, Ore. (Aug. 30, 2026) — Southern Oregon is expected to experience a significant shift in weather this week, with dry and seasonable conditions Sunday giving way to warmer temperatures and gusty winds Monday before rain and much cooler temperatures arrive Wednesday.
Sunday is expected to be relatively quiet across the Rogue Valley, with temperatures near seasonal averages and typical afternoon breezes. A brief ridge of high pressure will provide a temporary break before an approaching low-pressure system changes the pattern.
Temperatures will trend warmer Monday, but the combination of gusty south to southwest winds and low humidity will increase fire weather concerns across parts of Southern Oregon and Northern California.
The most significant concerns are expected in the Scott and Shasta valleys and areas east of the Cascades. A fire weather watch is in effect for portions of the region.
For the Rogue Valley, Monday’s weather is expected to remain dry, with increasing winds ahead of the approaching system.
The pattern becomes more unsettled Tuesday as moisture increases. Scattered showers could develop, particularly from the Cascades westward and into northern Klamath County.
Forecasters are also calling for a slight chance of thunderstorms, with a 15% to 20% probability focused primarily over western and central Siskiyou County, the Siskiyous and the Cascades.
Strong winds will remain possible in the Shasta Valley and east of the Cascades Tuesday, while portions of the east side could continue to experience elevated fire weather conditions because of low humidity.
The biggest change arrives Wednesday.
A cold front moving into the region is expected to bring a fall-like weather pattern to Southern Oregon, including cooler temperatures, rainfall and gusty southwest winds.
Daytime temperatures could fall 10 to 15 degrees below seasonal averages.
Rain is most likely west of the Cascades, with a 60% to 90% chance of precipitation Wednesday afternoon and Wednesday night. Northern Klamath and northern Lake counties also have a greater chance of seeing measurable rainfall.
In the Rogue Valley, rainfall amounts are expected to be relatively modest compared with areas closer to the coast. Forecasts call for around 0.25 inches or less in Jackson County, while heavier precipitation is possible in the Illinois Valley, Crater Lake area and other locations west of the Cascades.
The Oregon coast could receive significantly more rainfall, with forecast totals of 1 to 2 inches in Curry County and 0.75 to 1 inch in Coos County and northwest Douglas County.
The cooler pattern is expected to continue Thursday, with lingering showers as an upper-level trough remains over the region.
Showers could continue into Friday and Saturday, although the exact track of the low-pressure system remains uncertain. Forecast models differ on whether the system will weaken over the region or lift northward.
Forecasters expect temperatures to remain generally cooler than normal through Saturday.
The changing weather pattern could bring increasing humidity and rainfall to Southern Oregon following a prolonged period of dry summer conditions. However, fire weather concerns remain elevated Monday and in some areas Tuesday before the wetter pattern takes hold.
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