Aug
18.
An Upper Level High Pressure Ridge brings sunshine and slowly warming temperatures. The graphics for days 1-3 show a cold frontal system sliding in between Tuesday and Tuesday night. The graphics for days 3-7 Thursday through Monday show no frontal activity moving toward the coast or through the Pacific Northwest through the period until a cold front moves in next Monday.
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 26 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 27 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: 0 ABSENT
TREES: 0 ABSENT
WEEDS: 0 ABSENT
Measured 8.18.25
Data courtesy of Oregon Allergy Associates.
The grass pollen season has just about ended.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Mostly clear this evening, partly cloudy late tonight,
- Sunny and a bit warmer Tuesday, partly cloudy in the evening, mostly clear late Tuesday night,
- Sunny and a bit warmer Wednesday, clear at night,
- Sunny and warmer Thursday, then clear Thursday night.
- lows 52-56 highs 84-92.
- Sunny and a bit warmer Friday and Saturday, mostly clear Friday night,
- Sunny Saturday, mostly clear at night,
- Then sunny and a bit cooler Sunday and Monday, mostly clear Sunday night.
- highs 93-88 lows 57-56. (seasonal averages high 84 low 51).
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Forecast for the Umpqua Valley including Roseburg:
- Clear tonight,
- Sunny and a bit warmer Tuesday, clear Tuesday night,
- Sunny and a bit warmer Wednesday, clear at night,
- Sunny and a bit warmer Thursday, then clear Thursday night.
- lows 56-60 highs 86-92.
- Sunny and a bit warmer Friday, clear Friday night,
- Mostly sunny and a bit cooler Saturday, mostly clear at night,
- Sunny and a bit cooler Sunday and Monday, clear Sunday night,
- highs near 96-92 lows 62-60 warming back to 62 Sunday night. (seasonal averages high 86 low 57).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly clear this evening, mostly cloudy with patchy fog late tonight,
- Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night,
- Some AM clouds, sunny Wednesday, clear at night,
- Sunny Thursday, then clear Thursday night.
- lows 53-56 cooling to 54 Wednesday night warning to 55 Thursday night highs near 76.
- Mostly sunny and a bit cooler Friday, mostly clear Friday night,
- Mostly sunny and a bit warmer Saturday, mostly clear in the evening, partly cloudy late at night,
- Mostly sunny Sunday, mostly clear Sunday night,
- Then mostly sunny and a bit cooler Monday.
- highs 73-75 cooling to 74 Friday and Saturday lows near 54.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Partly cloudy this evening, mostly clear late tonight,
- Sunny and a bit warmer Tuesday, partly cloudy in the evening, clear Tuesday night,
- Sunny Wednesday, clear at night,
- Sunny and warmer Thursday, then clear Thursday night.
- free air freezing level 14,000 ft. tonight and Tuesday, 13,000 ft. Tuesday night through Wednesday night, then 16,000 ft. Thursday and Thursday night.
- lows 45-53 highs 73-82.
- Sunny and a bit warmer Friday, mostly clear Friday night,
- Then sunny and a bit cooler Saturday, Sunday, and Monday,mostly clear each night.
- free air freezing level 16,000 ft. Thursday through Saturday night, then 15,000 ft. Sunday through Monday.
- 88-82 lows 56-53.
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