An Upper Level High Pressure Ridge (“Arch”shape) weakens a bit increasing onshore airflow allowing cooling. The graphics for days 1-3 show a weak cold frontal system that moved through the Pacific Northwest today to start dropping temperatures to more normal levels. The graphics for days 3-7 Monday through Friday show the cold frontal system pushing past the Pacific Northwest to the east of us Tuesday and next Wednesday.
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ADVISORIES:
- NONE AT THIS TIME.
HEALTH ADVISORIES:
- A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER BAR. POOLS IN THE BEDROCK ALONG THE RIVERS EDGE ARE KNOWN TO DEVELOP BLUE-GREEN ALGAE (CYANOBACTERIAL) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE RIVER.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 30 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 32 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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Eugene-Springfield Area Pollen count:
GRASS: 12 MODERATE
TREES: 0 ABSENT
WEEDS: 0 ABSENT
Measured 7.17.25
Data courtesy of Oregon Allergy Associates.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Sunny and a bit cooler today, mostly clear tonight,
- Mostly sunny and a bit cooler Sunday, mostly cloudy at night,
- AM clouds, mostly sunny Monday, partly cloudy in the evening, then mostly clear late Monday night.
- highs 86-83 lows 52-56 cooling to 54 Monday night.
- Sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Sunny and a bit warmer Wednesday, clear in the evening, partly cloudy at night,
- Some AM clouds, sunny and a bit cooler Thursday afternoon, partly cloudy in the evening, mostly clear Thursday night,
- Then mostly sunny and a bit cooler Friday.
- highs 87-89 cooling to 86 Friday lows near 55. (seasonal averages high 85 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- Sunny and a bit cooler today, clear tonight,
- Partly cloudy and a bit cooler Sunday, partly cloudy in the evening, mostly cloudy at night,
- Mostly cloudy and a bit cooler Monday, then partly cloudy Monday night.
- highs 87-83 lows 57-60 cooling to 58 Monday night.
- Partly cloudy and a bit warmer Tuesday, mostly clear Tuesday night,
- Mostly sunny and a bit warmer Wednesday, partly cloudy at night,
- Then partly cloudy and a bit cooler Thursday and Friday, partly cloudy Thursday night.
- highs 87-90 cooling back to 87 Friday lows near 59 (seasonal averages high 87 low 58).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Some AM clouds with patchy dense coastal fog while just patchy fog inland, sunny and a bit warmer this afternoon, mostly clear this evening, partly cloudy with patchy fog late tonight,
- Mostly cloudy with patchy AM fog, partly cloudy Sunday afternoon, mostly cloudy at night,
- Patchy AM/late night fog, mostly cloudy and a bit cooler Monday, then partly cloudy Monday night.
- highs 69-68 lows 52-50 warming to 53 Sunday night cooling back to 52 Monday night.
- Partly cloudy and a bit warmer Tuesday, partly cloudy Tuesday night,
- Partly cloudy and a bit warmer Wednesday, mostly cloudy at night,
- Mostly cloudy Thursday, mostly cloudy Thursday night,
- Then mostly cloudy and a bit cooler Friday.
- highs 69-70 cooling back to to 69 Friday lows 53-54.
- (seasonal averages high 66 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Sunny and a bit cooler today, mostly clear tonight,
- Mostly sunny and a bit cooler Sunday, mostly cloudy at night,
- A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Monday, then partly cloudy Monday night.
- free air freezing level 15,000 ft. today and tonight, 15,000 ft. falling to 14,000 ft. Sunday afternoon, 14,000 ft. falling to 13,000 ft. late Sunday night, snow level above 8,000 ft. Monday, then free air freezing level 12,000 ft. Monday night.
- highs 78-72 lows 47-48 cooling to 46 Monday night.
- Sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Sunny and a bit warmer Wednesday, partly cloudy in the evening, mostly clear late at night,
- Sunny and a bit cooler Thursday, partly cloudy in the evening, mostly clear late Thursday night,
- Then mostly sunny and a bit cooler Friday.
- free air freezing level 12,000 ft. Tuesday, 13,000 ft. Tuesday night and Wednesday, 14,000 ft. Wednesday night through Thursday night, then 13,000 ft. Friday.
- highs 68-78 lows 46-52.
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