Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

51.1°F

Measurement Time: Wednesday, December 31, 2025, 7:00 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

55.8°F
Fog
Fog
56.8°F
41.6°F
72%
W 2.2 mph
6.7 mph
39.4°F
41.7°F
0 in
0%
9 mi
1016 mbar
0.2

Five Day Weather Forecast

Moderate rain
Wed
H: 45°F
L: 36°F
Heavy rain
Thu
H: 37°F
L: 31°F
Moderate or heavy snow showers
Fri
H: 34°F
L: 30°F
Heavy snow
Sat
H: 30°F
L: 27°F
Light snow
Sun
H: 30°F
L: 20°F

Air Quality

AQI: 1 - Good
PM2.5: 2.28 μg/m3
PM10: 2.38 μg/m3
Carbon Monoxide: 113.68 μg/m3
Nitrogen Dioxide: 1.48 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 92 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:02 AM
Sunset: 4:50 PM
Daylight: 9 hrs 35 mins
Moonrise: 1:58 PM
Moon Transit: 9:47 PM
Moonset: 4:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:36 AM - 7:06 AM
9:17 PM - 11:47 PM

Minor Periods

1:28 PM - 2:58 PM
3:57 AM - 5:27 AM

Action Rating: 3 out of 5

Winter Storm Watch issued December 30 at 5:38PM PST until January 4 at 10:00AM PST by NWS Sacramento CA

Effective: Tue December 30, 2025, 5:38 PM
Expires: Wed December 31, 2025, 4:00 PM

* WHAT...Heavy snow possible. Accumulations are uncertain at this time but may range from 1 to 3 feet above 5500 feet. Locally higher amounts are possible at higher elevations. Winds could gust as high as 45 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park. * WHEN...From Friday afternoon through Sunday morning. * IMPACTS...Dangerous travel conditions with chain controls and road closures possible. Low visibility due to combination of wind and heavy snow. * ADDITIONAL DETAILS...Snow accumulations remain above pass level through Friday afternoon, then drop to 5500 to 6500 feet late Friday night into Saturday.

Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1.


Dense Fog Advisory issued December 30 at 11:56PM PST until December 31 at 11:00AM PST by NWS Sacramento CA

Effective: Tue December 30, 2025, 11:56 PM
Expires: Wed December 31, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Northern San Joaquin Valley. * WHEN...Until 11 AM PST Wednesday. * 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 December 30 at 10:47PM PST until January 1 at 11:00AM PST by NWS Hanford CA

Effective: Tue December 30, 2025, 10:47 PM
Expires: Wed December 31, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Fresno-Clovis, Hanford - Corcoran - Lemoore, Los Banos - Dos Palos, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Southeast San Joaquin Valley, Visalia - Porterville - Reedley, and West Side of Fresno and Kings Counties. * WHEN...Until 11 AM PST Thursday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Wednesday, December 31, 2025

Weather Forecast

Moderate rain
44.6°F
35.7°F
41.2°F
72%
0.23 in
90%
0%
9.2 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 3.02 μg/m3
PM10: 3.2 μg/m3
Carbon Monoxide: 105.32 μg/m3
Nitrogen Dioxide: 2.16 μg/m3
Sulphur Dioxide: 1.69 μg/m3
Ozone: 92.88 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:02 AM
Sunset: 4:50 PM
Daylight: 9 hrs 35 mins
Moonrise: 1:58 PM
Moon Transit: 9:47 PM
Moonset: 4:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:36 AM - 7:06 AM
9:17 PM - 11:47 PM

Minor Periods

1:28 PM - 2:58 PM
3:57 AM - 5:27 AM

Action Rating: 3 out of 5

Thursday, January 1, 2026

Weather Forecast

Heavy rain
37.4°F
31.3°F
34.9°F
98%
3.51 in
89%
19%
4.7 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 1.77 μg/m3
PM10: 1.81 μg/m3
Carbon Monoxide: 109.2 μg/m3
Nitrogen Dioxide: 1.45 μg/m3
Sulphur Dioxide: 0.91 μg/m3
Ozone: 89.12 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:02 AM
Sunset: 4:51 PM
Daylight: 9 hrs 36 mins
Moonrise: 2:55 PM
Moon Transit: 10:53 PM
Moonset: 5:43 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.0%

Best Times for Fishing or Hunting

Major Periods

5:40 AM - 8:10 AM
12:00 AM - 12:00 AM

Minor Periods

2:25 PM - 3:55 PM
5:13 AM - 6:43 AM

Action Rating: 2 out of 5

Friday, January 2, 2026

Weather Forecast

Moderate or heavy snow showers
34.2°F
29.7°F
32.2°F
93%
1.05 in
88%
34%
9.6 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 1.5 μg/m3
PM10: 1.6 μg/m3
Carbon Monoxide: 111.76 μg/m3
Nitrogen Dioxide: 1.47 μg/m3
Sulphur Dioxide: 1.01 μg/m3
Ozone: 87.36 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:03 AM
Sunset: 4:52 PM
Daylight: 9 hrs 37 mins
Moonrise: 4:03 PM
Moon Transit: 12:00 AM
Moonset: 6:53 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:47 AM - 9:17 AM

Minor Periods

3:33 PM - 5:03 PM
6:23 AM - 7:53 AM

Action Rating: 5 out of 5

Saturday, January 3, 2026

Weather Forecast

Heavy snow
29.8°F
26.5°F
29.5°F
99%
2.16 in
89%
68%
15.9 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 2.28 μg/m3
PM10: 2.47 μg/m3
Carbon Monoxide: 117.5 μg/m3
Nitrogen Dioxide: 1.79 μg/m3
Sulphur Dioxide: 1.11 μg/m3
Ozone: 87.48 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:03 AM
Sunset: 4:53 PM
Daylight: 9 hrs 37 mins
Moonrise: 5:18 PM
Moon Transit: 12:00 AM
Moonset: 7:51 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:53 AM - 10:23 AM

Minor Periods

4:48 PM - 6:18 PM
7:21 AM - 8:51 AM

Action Rating: 5 out of 5

Sunday, January 4, 2026

Weather Forecast

Light snow
29.8°F
20.3°F
26°F
96%
0.26 in
86%
65%
6.9 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 1.2 μg/m3
PM10: 1.4 μg/m3
Carbon Monoxide: 122.33 μg/m3
Nitrogen Dioxide: 1.55 μg/m3
Sulphur Dioxide: 0.73 μg/m3
Ozone: 107.92 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:04 AM
Sunset: 4:54 PM
Daylight: 9 hrs 38 mins
Moonrise: 6:35 PM
Moon Transit: 1:02 AM
Moonset: 8:37 AM
Moon Phase: Full
Moon Illumination: 98.1%

Best Times for Fishing or Hunting

Major Periods

12:32 AM - 3:02 AM
8:54 AM - 11:24 AM

Minor Periods

6:05 PM - 7:35 PM
8:07 AM - 9:37 AM

Action Rating: 3 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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