Aug
03.
An Upper Level Low Pressure Trough (“U “Shape) keeps up the onshore airflow to control temperatures. The graphics for days 1-3 show no frontal systems moving into the Pacific Northwest. The graphics for days 3-7 Thursday through Monday show a frontal system on the way to Oregon between Thursday and Friday.
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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 28 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 22 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 25 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: 5 MODERATE
TREES: 2 LOW
WEEDS: 0 ABSENT
Measured 7.31.25
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:
- Mostly sunny and a bit warmer today, mostly clear this evening, partly cloudy late tonight,
- Sunny and a bit warmer Tuesday, partly cloudy at night,
- A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Wednesday, then mostly cloudy with a slight (20%) chance of showers Wednesday night.
- highs 79-85 cooling to 83 Wednesday lows 52-59.
- AM clouds, a mix of clouds and sun and a bit warmer Thursday afternoon, partly cloudy late Thursday night,
- Sunny and a bit warmer Friday and Saturday, mostly clear both nights,
- Then sunny and a bit warmer Sunday.
- highs 85-96 lows 53-58. (seasonal averages high 86 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- Some AM clouds with patchy fog, , sunny and a bit warmer this afternoon, mostly clear with patchy fog late tonight,
- Patchy AM fog, sunny and a bit warmer Tuesday afternoon, partly cloudy at night,
- Partly cloudy and a bit cooler Wednesday, partly cloudy with a slight (20%) chance of showers Wednesday night and patchy fog late Wednesday night.
- highs 82-87 cooling to 85 Wednesday lows 56-55 62 Wednesday night.
- Mostly cloudy patchy AM fog, just mostly cloudy and a bit warmer Thursday afternoon, partly cloudy Thursday night,
- Mostly sunny and a bit warmer Friday, mostly clear at night,
- Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
- highs 87-98 lows 58-63. (seasonal averages high 87 low 58).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- AM clouds with patchy fog, sunny and a bit warmer this afternoon, partly cloudy with patchy evening coastal fog and areas of coastal fog late tonight while patchy inland fog late tonight,
- Partly cloudy with areas of AM coastal fog while patchy AM inland fog, partly cloudy and a bit warmer Tuesday afternoon and evening, partly cloudy with patchy coastal fog and a slight (20%) chance of showers late Tuesday night while mostly cloudy with a slight (20%) chance of inland showers and patchy inland fog late at night,
- Mostly cloudy with patchy AM fog and a slight (20%) chance of showers, partly cloudy and a bit warmer with a slight (20%) chance of showers Wednesday afternoon, mostly cloudy with patchy fog and a slight (20%) chance of evening showers, then mostly cloudy with areas of fog late Wednesday night.
- highs 72-75 lows 54-59 .
- Mostly cloudy AM fog and a slight (20%) chance of showers, just mostly cloudy and a bit cooler Thursday afternoon, mostly cloudy with patchy fog late Thursday night,
- Some AM clouds with patchy fog, sunny and a bit warmer Friday afternoon, mostly clear Friday night,
- Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
- highs 74-78 lows 55-57.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly sunny and a bit warmer today, mostly clear this evening, partly cloudy late tonight,
- Sunny and a bit warmer Tuesday, partly cloudy at night,
- Mostly sunny and a bit cooler Wednesday, then mostly cloudy with a slight (20% chance of showers Wednesday night.
- free air freezing level 12,000 ft. today, 13,000 ft. tonight through Wednesday, then snow level above 8,000 ft. Wednesday night.
- highs 67-72 cooling to 70 Wednesday lows 43-48.
- A mix of clouds and sun Thursday, partly cloudy Thursday night,
- Sunny and a bit warmer Friday and Saturday, mostly clear both nights,
- Then sunny and a bit warmer Sunday.
- free air freezing level 14,000 ft. Thursday, 15,000 ft. Thursday night, 14,000 ft. Thursday, 15,000 ft. Thursday night through Saturday, then 16,000 ft. Saturday night and Sunday.
- highs 70-84 lows 45-52.
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