An Upper Level Low Pressure Trough (“U “Shape) keeps up the onshore airflow to control temperatures and cause mountain thunderstorms. The graphics for days 1-3 show no frontal systems moving into the Pacific Northwest. The graphics for days 3-7 Tuesday through Saturday 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 18 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 19 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 14 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:
- Sunny and a bit cooler today, mostly clear this evening, partly cloudy late tonight,
- AM clouds and sun, mostly cloudy and a bit cooler Sunday, mostly cloudy in the evening, partly cloudy late at night,
- Mostly sunny and a bit warmer Monday, partly cloudy in the evening, clear late Monday night.
- highs 86-79 warming to 80 Monday lows 53-52.
- Sunny and a bit warmer Tuesday, partly cloudy Tuesday night,
- A mix of clouds and sun and a bit warmer Wednesday, partly cloudy with a slight (20%) chance of showers at night,
- Mostly sunny with a slight (20%) chance of showers Thursday, partly cloudy Thursday night,
- Then mostly sunny and a bit warmer Friday.
- highs 85-90 lows 54-60. (seasonal averages high 86 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- Sunny and a bit cooler today, mostly clear this evening, partly cloudy late tonight,
- Mostly cloudy and a bit cooler Sunday, partly cloudy at night,
- Some AM clouds, sunny and a bit warmer Monday afternoon, then mostly clear Monday night.
- highs 87-79 warming to 82 Monday lows 59-55.
- Mostly sunny and a bit warmer Tuesday, mostly clear in the evening, partly cloudy late Tuesday night,
- Partly cloudy and a bit warmer Wednesday, partly cloudy at night,
- Partly cloudy and a bit warmer Thursday and Thursday night,
- Then partly cloudy Friday.
- highs 87-92 lows 59-65. (seasonal averages high 88 low 58).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with patchy inland AM fog, sunny and a bit warmer this afternoon, partly cloudy this evening, mostly cloudy with patchy fog late tonight,
- Patchy AM fog, mostly cloudy and a bit cooler Sunday afternoon, partly cloudy in the evening, mostly cloudy late at night,
- Partly cloudy and a bit warmer Monday, then partly cloudy Monday night.
- highs 72-69 warming back to 72 lows 55-53.
- Partly cloudy and a bit warmer Tuesday, partly cloudy in the evening, mostly cloudy Tuesday night,
- Mostly cloudy and a bit warmer Wednesday, mostly cloudy at night,
- Mostly cloudy start with a slight (20%) chance of AM showers, partly cloudy and a bit warmer Thursday afternoon, mostly cloudy Thursday night,
- Then mostly cloudy Friday.
- highs 74-76 lows 56-58.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Sunny and a bit cooler today, mostly clear this evening, partly cloudy late tonight,
- A mix of clouds and sun and a bit cooler with a (40%) chance of showers Sunday afternoon, mostly cloudy with slight (20%) chance of evening showers and a slight (20%) chance of thunderstorms at night,
- AM clouds and sun, mostly sunny with a slight (20%) chance of showers and a bit cooler Monday afternoon, just partly cloudy Monday night.
- free air freezing level 13,000 ft. tonight through Saturday night, snow level above 8,000 ft. Sunday and Sunday night, free air freezing level 11,000 ft. Monday, then 13,000 ft. Monday night.
- highs 75-65 lows 48-43.
- Sunny and a bit warmer Tuesday, partly cloudy Tuesday night,
- Mostly sunny and a bit warmer Wednesday, partly cloudy at night,
- Mostly sunny and a bit warmer with a slight (20%) chance of showers Thursday, partly cloudy Thursday night,
- Then mostly sunny and a bit warmer Friday.
- free air freezing level 13,000 ft. Tuesday, 14,000 ft. Tuesday night and Wednesday, 15,000 ft. Wednesday night, snow level above 8,000 ft. Thursday, then free air freezing level 16,000 ft. Thursday night and Friday.
- highs 72-77 lows 47-50 Thursday.
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