Weather
Eugene, OR Weather Update: Weekend Fog, 60s Oct 17-19
Eugene, OR – A noticeable shift toward cooler fall weather is approaching Oregon's southern Willamette Valley, where afternoon temperatures are expected to fall from nearly 80 degrees Thursday to the
By Lena Wood · 2026-10-15T10:08:01.795Z
Eugene, OR – A noticeable shift toward cooler fall weather is approaching Oregon's southern Willamette Valley, where afternoon temperatures are expected to fall from nearly 80 degrees Thursday to the lower 60s by early next week. After two relatively warm and sunny afternoons, patchy morning fog is expected to develop over the weekend, followed by increasing clouds and a slight chance of rain Monday. The changing conditions could affect morning travel and outdoor activities as Eugene transitions into a cooler mid October weather pattern.
According to the National Weather Service in Portland, temperatures in Eugene are expected to reach approximately 79 degrees Thursday, Oct. 15, before easing slightly to 78 Friday. A more noticeable cooldown arrives Saturday, Oct. 17, when temperatures fall to around 66 degrees. Sunday, Oct. 18, brings another modest decline to 64 degrees, followed by a high near 60 Monday. The overall change represents a 19 degree decline between Thursday and Monday.
Weekend Fog Arrives as Temperatures Drop Thursday will bring sunny skies and light winds across Eugene, with temperatures reaching approximately 79 degrees. Calm morning winds are expected to become north northwesterly around 5 mph during the afternoon, followed by mostly clear skies and a nighttime low near 47 degrees.
Friday remains relatively warm, with mostly sunny conditions and a high near 78 degrees. Clouds begin increasing Friday night as temperatures fall toward 47, signaling the transition into a cooler weekend.
Saturday brings a more substantial temperature change, with afternoon highs reaching only 66 degrees. Patchy fog is expected between 11 a.m. and noon, while cloudy skies gradually become mostly sunny later in the day. Saturday night temperatures are forecast to fall to approximately 41 degrees.
Sunday continues the cooler trend, with patchy fog possible between 8 and 10 a.m. before mostly sunny conditions develop. Afternoon temperatures are expected to reach approximately 64 degrees, representing a 15 degree decline from Thursday's projected high.
Morning Visibility Could Affect Valley Travel The return of patchy fog may create localized visibility concerns for motorists traveling through Eugene, Springfield and surrounding Lane County communities. Drivers using Interstate 5, Oregon Route 126 and other southern Willamette Valley roadways should remain attentive to changing conditions during the morning hours.
Although patchy fog is forecast, the supplied National Weather Service information does not indicate a dense fog advisory or widespread hazardous driving conditions. Visibility may vary considerably between neighborhoods and lower lying areas.
Residents planning outdoor activities should also prepare for cooler mornings and afternoons. Temperatures falling into the lower 40s Saturday night and around 40 Sunday night will feel considerably different from the warm daytime conditions expected Thursday and Friday.
Rain Chances Return Early Next Week The next weather development arrives Monday, when the National Weather Service forecasts a slight chance of rain under mostly cloudy skies. Temperatures are expected to reach approximately 60 degrees, making Monday the coolest afternoon in the supplied forecast period.
A slight chance of rain continues Monday night, with temperatures falling to around 40 degrees. No precipitation probabilities or rainfall totals are specified, leaving uncertainty about whether measurable rainfall will occur.
Tuesday brings improving conditions, with mostly sunny skies and temperatures near 63 degrees. Wednesday is expected to reach approximately 65 degrees, although patchy fog may return during the morning.
With weekend fog, cooler temperatures and possible rain approaching, will the changing weather affect your outdoor plans across the Willamette Valley?
Five Day Weather Outlook Thursday 10/15: Sunny skies will bring afternoon temperatures near 79 degrees across Eugene, with calm winds becoming north northwesterly around 5 mph. Mostly clear conditions are expected Thursday night, with temperatures falling to approximately 47 degrees.
Friday 10/16: Mostly sunny skies will continue as temperatures reach approximately 78 degrees, keeping conditions relatively warm for mid October. Clouds increase Friday night, with light and variable winds and temperatures falling to around 47 degrees.
Saturday 10/17: Patchy fog is expected between 11 a.m. and noon, followed by gradually improving skies and a high near 66 degrees. Partly cloudy conditions develop Saturday night, with temperatures dropping to approximately 41 degrees.
Sunday 10/18: Patchy fog may develop between 8 and 10 a.m. before mostly sunny skies return, with afternoon temperatures reaching around 64 degrees. Increasing clouds are expected Sunday night, with temperatures falling to approximately 40 degrees.
Monday 10/19: Mostly cloudy skies and a slight chance of rain will accompany cooler temperatures near 60 degrees. The rain possibility continues Monday night, with mostly cloudy conditions and temperatures falling to approximately 40 degrees.
Extended Outlook Tuesday, Oct. 20, is expected to bring mostly sunny skies and an afternoon high near 63 degrees, followed by mostly clear conditions and a nighttime low around 39 degrees.
Wednesday, Oct. 21, should remain mostly sunny after areas of patchy morning fog, with temperatures reaching approximately 65 degrees.