MEDFORD, Ore. (Jun. 7, 2026) — Residents across Southern Oregon and Northern California awoke Sunday to chilly temperatures and frost concerns east of the Cascades, but forecasters say a warming trend will be short-lived as another Pacific storm system arrives early this week.
The National Weather Service continued a Freeze Warning and Frost Advisory through 9 a.m. Sunday for areas east of the Cascades, where temperatures dipped into the mid-20s in parts of Klamath County. Communities in northeastern Siskiyou County and Modoc County saw readings in the low to mid-30s, while much of western Oregon remained in the 40s. The Illinois Valley was among the colder west-side locations, with temperatures falling into the mid-30s.
After a cold start, high pressure is expected to briefly return Sunday afternoon, bringing temperatures closer to seasonal norms. Most inland locations are forecast to reach the upper 60s to low 70s under mostly clear skies.
The reprieve will be short-lived as the next weather system approaches the Oregon coast Sunday night. Rain is expected to spread inland Monday morning, reaching the Cascade Range and eventually areas east of the mountains during the morning commute.
Forecasters said coastal communities and portions of western Josephine County and Siskiyou County are likely to receive the heaviest rainfall. Between Monday morning and late Monday, rainfall totals could approach one-half inch in parts of Coos County, while portions of Curry County may receive between 1.25 and 1.50 inches.
In the Cascades, particularly from Prospect northward, rainfall totals of one-quarter to one-half inch are possible. The Umpqua Basin is favored to receive measurable precipitation, with a 70% to 80% chance of collecting at least two-tenths of an inch of rain.
Thunderstorm potential remains low, with forecasters placing the chance of thunderstorms below 15% due to limited atmospheric instability.
The incoming front will also bring cooler temperatures Monday, with afternoon highs returning to the 50s and 60s. Gusty southwest winds are expected to develop, with sustained speeds of 15 to 25 mph possible in parts of Josephine County, the Cascades, Northern California and east of the Cascades. The strongest and longest-lasting winds are expected east of the mountains into Monday evening.
Showery weather is expected to persist through Tuesday, primarily affecting the Cascades and areas west of the range.
Looking ahead, forecasters expect a thermal trough to begin developing along the Oregon coast by Wednesday night, ushering in a return to warmer and drier conditions through the latter half of the week. While temperatures are expected to climb, the likelihood of triple-digit heat has decreased. Current forecasts indicate about a 25% chance of temperatures reaching 100 degrees by Saturday as the thermal trough remains over the region.
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