Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

48.4°F

Measurement Time: Monday, January 19, 2026, 1:00 AM PST

Temperature Locations

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Local Points of Interest

Hetch Hetchy Reservoir; Yosemite National Park; White Wolf, CA

Tuolumne River

Station Name: TUOLUMNE R NR HETCH HETCHY CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 3,484 feet

Nearest Address:
Hetch Hetchy Road
Groveland, CA 95321
Tuolumne County

GPS Coordinates: 37.93742147, -119.7982326

Nearby Water Temperatures

Cherry Creek, Groveland, CA (6.8 mi)
Tuolumne River, Groveland, CA (7.7 mi)
Tuolumne River, Groveland, CA (9.1 mi)
Tuolumne River, Groveland, CA (10.1 mi)
Merced River, Yosemite Valley, CA (19.3 mi)
Middle Fork San Joaquin River, Mammoth Lakes, CA (44.2 mi)
Deadman Creek, Mammoth Lakes, CA (48.6 mi)
Hot Creek, Mammoth Lakes, CA (55.1 mi)
Hot Creek, Mammoth Lakes, CA (55.6 mi)
Hot Creek, Mammoth Lakes, CA (56.7 mi)
San Joaquin River, Friant, CA (66 mi)
Trout Creek, South Lake Tahoe, CA (68.5 mi)
Upper Truckee River, South Lake Tahoe, CA (68.9 mi)
Walker Lake, Walker Lake, NV (78.6 mi)
General Creek, Tahoma, CA (78.9 mi)

Weather for Groveland, California

Current Weather

41.1°F
Sunny
Sunny
36.9°F
41.1°F
28%
ENE 5.4 mph
10.4 mph
36.9°F
9.7°F
0 in
0%
9 mi
1020 mbar
0.9

Five Day Weather Forecast

Sunny
Mon
H: 55°F
L: 35°F
Sunny
Tue
H: 49°F
L: 34°F
Overcast
Wed
H: 49°F
L: 39°F
Patchy rain nearby
Thu
H: 45°F
L: 23°F
Sunny
Fri
H: 45°F
L: 24°F

Air Quality

AQI: 1 - Good
PM2.5: 2.28 μg/m3
PM10: 2.58 μg/m3
Carbon Monoxide: 109.68 μg/m3
Nitrogen Dioxide: 1.68 μg/m3
Sulphur Dioxide: 1.58 μg/m3
Ozone: 95 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:10 AM
Sunset: 5:08 PM
Daylight: 9 hrs 56 mins
Moonrise: 8:01 AM
Moon Transit: 1:02 PM
Moonset: 6:11 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

8:50 PM - 11:20 PM
12:32 AM - 3:02 PM

Minor Periods

5:41 PM - 7:11 PM
7:31 AM - 9:01 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued January 18 at 8:34PM PST until January 19 at 12:00PM PST by NWS Sacramento CA

Effective: Sun January 18, 2026, 8:34 PM
Expires: Mon January 19, 2026, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carquinez Strait and Delta, Central and Southern Sacramento Valley, and Northern San Joaquin Valley. * WHEN...Until noon PST Monday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued January 19 at 3:01AM PST until January 19 at 12:00PM PST by NWS Sacramento CA

Effective: Mon January 19, 2026, 3:01 AM
Expires: Mon January 19, 2026, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carquinez Strait and Delta, Central Sacramento Valley, Northern San Joaquin Valley, and Southern Sacramento Valley. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued January 18 at 7:47PM PST until January 19 at 12:00PM PST by NWS Hanford CA

Effective: Sun January 18, 2026, 7:47 PM
Expires: Mon January 19, 2026, 4:00 AM

* WHAT...Visibilities likely less than 200 feet to near zero in dense fog. * WHERE...A portion of central California. * WHEN...Until noon PST Monday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Visibility will improve at most locations by Monday afternoon. However, dense fog returns early in the evening.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued January 19 at 3:47AM PST until January 19 at 12:00PM PST by NWS Hanford CA

Effective: Mon January 19, 2026, 3:47 AM
Expires: Mon January 19, 2026, 12:00 PM

* WHAT...Visibilities likely less than 200 feet to near zero in dense fog. * WHERE...San Joaquin Valley. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Visibility will improve at most locations by Monday afternoon. However, dense fog returns early in the evening.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Monday, January 19, 2026

Weather Forecast

Sunny
54.9°F
34.9°F
43.5°F
43%
0 in
0%
0%
9.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 3.61 μg/m3
PM10: 4.69 μg/m3
Carbon Monoxide: 106.32 μg/m3
Nitrogen Dioxide: 1.86 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 92.84 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:10 AM
Sunset: 5:08 PM
Daylight: 9 hrs 56 mins
Moonrise: 8:01 AM
Moon Transit: 1:02 PM
Moonset: 6:11 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

8:50 PM - 11:20 PM
12:32 AM - 3:02 PM

Minor Periods

5:41 PM - 7:11 PM
7:31 AM - 9:01 AM

Action Rating: 4 out of 5

Tuesday, January 20, 2026

Weather Forecast

Sunny
49.3°F
34.3°F
40.7°F
44%
0 in
0%
0%
6.3 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 3.18 μg/m3
PM10: 3.45 μg/m3
Carbon Monoxide: 106.12 μg/m3
Nitrogen Dioxide: 1.84 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 91 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:10 AM
Sunset: 5:09 PM
Daylight: 9 hrs 58 mins
Moonrise: 8:31 AM
Moon Transit: 1:49 PM
Moonset: 7:17 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:19 PM - 3:49 PM

Minor Periods

6:47 PM - 8:17 PM
8:01 AM - 9:31 AM

Action Rating: 3 out of 5

Wednesday, January 21, 2026

Weather Forecast

Overcast
49.3°F
38.9°F
42.8°F
38%
0 in
0%
0%
8.3 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.99 μg/m3
PM10: 3.22 μg/m3
Carbon Monoxide: 105.8 μg/m3
Nitrogen Dioxide: 2.02 μg/m3
Sulphur Dioxide: 1.22 μg/m3
Ozone: 92.72 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:10 AM
Sunset: 5:10 PM
Daylight: 9 hrs 59 mins
Moonrise: 8:56 AM
Moon Transit: 2:34 PM
Moonset: 8:23 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:04 PM - 4:34 PM

Minor Periods

7:53 PM - 9:23 PM
8:26 AM - 9:56 AM

Action Rating: 2 out of 5

Thursday, January 22, 2026

Weather Forecast

Patchy rain nearby
45.3°F
23°F
37.5°F
59%
0.03 in
82%
9%
12.5 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 4.11 μg/m3
PM10: 4.55 μg/m3
Carbon Monoxide: 114.03 μg/m3
Nitrogen Dioxide: 2 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 93.08 μg/m3

Astronomical

Sunrise: 7:10 AM
Sun Transit: 12:10 AM
Sunset: 5:11 PM
Daylight: 10 hrs 1 mins
Moonrise: 9:20 AM
Moon Transit: 12:00 AM
Moonset: 9:28 PM
Moon Phase: Waxing Crescent
Moon Illumination: 15.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

8:58 PM - 10:28 PM
8:50 AM - 10:20 AM

Action Rating: 2 out of 5

Friday, January 23, 2026

Weather Forecast

Sunny
45.1°F
24.2°F
33.3°F
58%
0 in
0%
0%
12.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 5.94 μg/m3
PM10: 6.35 μg/m3
Carbon Monoxide: 117.6 μg/m3
Nitrogen Dioxide: 2.23 μg/m3
Sulphur Dioxide: 1.22 μg/m3
Ozone: 92 μg/m3

Astronomical

Sunrise: 7:10 AM
Sun Transit: 12:11 AM
Sunset: 5:12 PM
Daylight: 10 hrs 3 mins
Moonrise: 9:44 AM
Moon Transit: 6:54 AM
Moonset: 10:35 PM
Moon Phase: Waxing Crescent
Moon Illumination: 24.4%

Best Times for Fishing or Hunting

Major Periods

6:24 AM - 8:54 AM
6:24 AM - 8:54 AM

Minor Periods

10:05 PM - 11:35 PM
9:14 AM - 10:44 AM

Action Rating: 2 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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