Water Temperature of the Coast Fork Willamette River in Cottage Grove, OR

Current Water Temperature

44.2°F

Measurement Time: Monday, December 29, 2025, 10:40 PM PST

Temperature Locations

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Local Points of Interest

Cottage Grove Lake; Cottage Grove Dam

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Coast Fork Willamette River

Station Name: COAST FORK WILLAMETTE R BLW COTTAGE GROVE DAM, OR
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 738 feet

Nearest Address:
75800 Reservoir Rd
Cottage Grove, OR 97424
Lane County

GPS Coordinates: 43.72067785, -123.0497994

Nearby Water Temperatures

Coast Fork Willamette River, London, OR (5.8 mi)
Row River, Cottage Grove, OR (5.8 mi)
Row River, Dorena, OR (8.9 mi)
Middle Fork Willamette River, Fall Creek, OR (18.8 mi)
Cedar Creek, Thurston, OR (24.3 mi)
McKenzie River, Springfield, OR (24.6 mi)
Middle Fork Willamette River, Oakridge, OR (25 mi)
Camp Creek, Springfield, OR (25.5 mi)
Willamette River , Eugene, OR (25.8 mi)
Rock Creek, Glide, OR (26 mi)
McKenzie River, Eugene, OR (27.1 mi)
North Fork Middle Fork Willamette River, Westfir, OR (27.3 mi)
North Umpqua River, Idleyld Park, OR (27.5 mi)
McKenzie River, Walterville, OR (27.8 mi)
Long Tom River, Alvadore, OR (30.5 mi)

Weather for Cottage Grove, Oregon

Current Weather

30.4°F
Mostly cloudy
Conditions: Mostly cloudy
Humidity: 95%
Heat Index: 30.4°F
Feels Like: 30.4°F
Wind: NE 0.6 mph
Wind Gusts: 2 mph
Wind Chill: 30.4°F
Air Pressure: 1024.12 millibars
Dew Point: 30.4°F
Chance of Precipitation: 10%
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 6 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Tue
H: 57°F
L: 34°F
Overcast
Wed
H: 50°F
L: 39°F
Heavy rain
Thu
H: 49°F
L: 44°F
Patchy rain nearby
Fri
H: 58°F
L: 43°F
Moderate rain
Sat
H: 46°F
L: 39°F

Air Quality

AQI: 1 - Good
PM2.5: 4.95 μg/m3
PM10: 5.15 μg/m3
Carbon Monoxide: 249.85 μg/m3
Nitrogen Dioxide: 9.15 μg/m3
Sulphur Dioxide: 2.15 μg/m3
Ozone: 33 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:15 AM
Sunset: 4:45 PM
Daylight: 8 hrs 59 mins
Moonrise: 1:07 PM
Moon Transit: 8:57 PM
Moonset: 3:40 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

3:23 AM - 5:53 AM
8:27 PM - 10:57 PM

Minor Periods

12:37 AM - 2:07 PM
3:10 AM - 4:40 AM

Action Rating: 2 out of 5

Dense Fog Advisory issued December 30 at 4:24AM PST until December 30 at 10:00AM PST by NWS Portland OR

Effective: Tue December 30, 2025, 4:24 AM
Expires: Tue December 30, 2025, 10:00 AM

* WHAT...Visibility one quarter mile or less in dense freezing fog. * WHERE...Lower Columbia River and Cowlitz River Valleys, and Lane County Lowlands. * WHEN...Until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Some areas could see slick surfaces. Especially on raised, metal surfaces. * ADDITIONAL DETAILS...With temperatures currently at or near freezing. Expect dense freezing fog.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If driving, slow down and leave plenty of distance ahead of you. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.


Air Stagnation Advisory issued December 29 at 2:25PM PST until December 31 at 4:00PM PST by NWS Medford OR

Effective: Mon December 29, 2025, 2:25 PM
Expires: Wed December 31, 2025, 4:00 PM

* WHAT...Air quality is likely to worsen through Wednesday afternoon. This is due to an inversion and stagnant air conditions near the surface that will trap pollutants. * WHERE...Valley areas, both west of the Cascades in Jackson, Josephine and Douglas counties, and east of the Cascades in Klamath and Lake counties. * WHEN...Until 4 PM PST Wednesday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

Persons with respiratory illness should follow their physicians advice for dealing with high levels of air pollution during periods of stagnant air.
Tuesday, December 30, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 43.1°F
Average Humidity: 77%
Chance of Rain: 0%
Wind: 3.4 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 7.25 μg/m3
PM10: 7.48 μg/m3
Carbon Monoxide: 266.73 μg/m3
Nitrogen Dioxide: 18.21 μg/m3
Sulphur Dioxide: 2.27 μg/m3
Ozone: 17.8 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:15 AM
Sunset: 4:45 PM
Daylight: 8 hrs 59 mins
Moonrise: 1:07 PM
Moon Transit: 8:57 PM
Moonset: 3:40 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

3:23 AM - 5:53 AM
8:27 PM - 10:57 PM

Minor Periods

12:37 AM - 2:07 PM
3:10 AM - 4:40 AM

Action Rating: 2 out of 5

Wednesday, December 31, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 45°F
Average Humidity: 72%
Chance of Rain: 0%
Wind: 2.5 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 10.38 μg/m3
PM10: 10.75 μg/m3
Carbon Monoxide: 273.25 μg/m3
Nitrogen Dioxide: 23.05 μg/m3
Sulphur Dioxide: 3.17 μg/m3
Ozone: 12.12 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:15 AM
Sunset: 4:45 PM
Daylight: 9 hrs mins
Moonrise: 1:48 PM
Moon Transit: 10:00 PM
Moonset: 5:02 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:22 AM - 6:52 AM
9:30 PM - 12:00 PM

Minor Periods

1:18 PM - 2:48 PM
4:32 AM - 6:02 AM

Action Rating: 2 out of 5

Thursday, January 1, 2026

Weather Forecast

Conditions: Heavy rain
Average Temperature: 46.1°F
Average Humidity: 91%
Chance of Rain: 89%
Wind: 2.2 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 13.88 μg/m3
PM10: 14.52 μg/m3
Carbon Monoxide: 324.13 μg/m3
Nitrogen Dioxide: 28.39 μg/m3
Sulphur Dioxide: 2.74 μg/m3
Ozone: 10.44 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:15 AM
Sunset: 4:46 PM
Daylight: 9 hrs mins
Moonrise: 2:43 PM
Moon Transit: 11:07 PM
Moonset: 6:22 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.0%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
12:00 AM - 12:00 AM

Minor Periods

2:13 PM - 3:43 PM
5:52 AM - 7:22 AM

Action Rating: 4 out of 5

Friday, January 2, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 48°F
Average Humidity: 93%
Chance of Rain: 89%
Wind: 8.9 mph
UV Index: 2

Air Quality

AQI: 1 - Good
PM2.5: 7.08 μg/m3
PM10: 7.17 μg/m3
Carbon Monoxide: 231.62 μg/m3
Nitrogen Dioxide: 15.91 μg/m3
Sulphur Dioxide: 1.58 μg/m3
Ozone: 20.56 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:16 AM
Sunset: 4:47 PM
Daylight: 9 hrs 1 mins
Moonrise: 3:51 PM
Moon Transit: 12:00 AM
Moonset: 7:32 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:34 AM - 9:04 AM

Minor Periods

3:21 PM - 4:51 PM
7:02 AM - 8:32 AM

Action Rating: 4 out of 5

Saturday, January 3, 2026

Weather Forecast

Conditions: Moderate rain
Average Temperature: 43.4°F
Average Humidity: 94%
Chance of Rain: 88%
Wind: 6.9 mph
UV Index: 2

Air Quality

AQI: 1 - Good
PM2.5: 2.75 μg/m3
PM10: 2.8 μg/m3
Carbon Monoxide: 180.23 μg/m3
Nitrogen Dioxide: 7.12 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 59.54 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:16 AM
Sunset: 4:48 PM
Daylight: 9 hrs 2 mins
Moonrise: 5:10 PM
Moon Transit: 12:13 AM
Moonset: 8:28 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:39 AM - 10:09 AM

Minor Periods

4:40 PM - 6:10 PM
7:58 AM - 9:28 AM

Action Rating: 6 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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