Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

48.2°F

Measurement Time: Tuesday, January 27, 2026, 6:00 PM 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

29.7°F
Overcast
Overcast
22.5°F
29.7°F
22%
ESE 4.3 mph
8.9 mph
22.5°F
-3.9°F
0 in
100%
9 mi
1028 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 44°F
L: 24°F
Sunny
Thu
H: 49°F
L: 34°F
Cloudy
Fri
H: 53°F
L: 36°F
Sunny
Sat
H: 51°F
L: 34°F
Sunny
Sun
H: 50°F
L: 32°F

Air Quality

AQI: 1 - Good
PM2.5: 1.98 μg/m3
PM10: 2.68 μg/m3
Carbon Monoxide: 124.68 μg/m3
Nitrogen Dioxide: 0.78 μg/m3
Sulphur Dioxide: 2.38 μg/m3
Ozone: 109 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:12 AM
Sunset: 5:18 PM
Daylight: 10 hrs 12 mins
Moonrise: 12:40 AM
Moon Transit: 8:35 PM
Moonset: 3:25 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

3:25 AM - 5:55 AM
8:05 PM - 10:35 PM

Minor Periods

12:10 AM - 1:40 PM
2:55 AM - 4:25 AM

Action Rating: 2 out of 5

Dense Fog Advisory issued January 27 at 3:38PM PST until January 28 at 12:00PM PST by NWS Hanford CA

Effective: Tue January 27, 2026, 3:38 PM
Expires: Wed January 28, 2026, 3:45 AM

* WHAT...Visibility one quarter mile or less in dense fog. Worst case scenario, visibilities down to zero. * WHERE...A portion of central California. * WHEN...For the first Dense Fog Advisory, from 1 AM to noon PST Wednesday. For the second Dense Fog Advisory, from 11 PM Wednesday to noon PST Thursday. * IMPACTS...Low visibility could make driving conditions hazardous. Visibility can change quickly, before you have time to react. * ADDITIONAL DETAILS...Highways include, but are not limited to Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 180 and 198.

If driving, slow down, use your manual or low beam headlights. Do not use automatic headlights since your tail lights will be dark. Leave plenty of distance ahead of you. Have an alternate plans if you will traveling during this time.


Dense Fog Advisory issued January 27 at 3:38PM PST until January 29 at 12:00PM PST by NWS Hanford CA

Effective: Tue January 27, 2026, 3:38 PM
Expires: Wed January 28, 2026, 3:45 AM

* WHAT...Visibility one quarter mile or less in dense fog. Worst case scenario, visibilities down to zero. * WHERE...A portion of central California. * WHEN...For the first Dense Fog Advisory, from 1 AM to noon PST Wednesday. For the second Dense Fog Advisory, from 11 PM Wednesday to noon PST Thursday. * IMPACTS...Low visibility could make driving conditions hazardous. Visibility can change quickly, before you have time to react. * ADDITIONAL DETAILS...Highways include, but are not limited to Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 180 and 198.

If driving, slow down, use your manual or low beam headlights. Do not use automatic headlights since your tail lights will be dark. Leave plenty of distance ahead of you. Have an alternate plans if you will traveling during this time.
Wednesday, January 28, 2026

Weather Forecast

Sunny
44.2°F
23.9°F
33.9°F
39%
0 in
0%
0%
6.7 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 3.05 μg/m3
PM10: 3.35 μg/m3
Carbon Monoxide: 129.12 μg/m3
Nitrogen Dioxide: 1.44 μg/m3
Sulphur Dioxide: 2.3 μg/m3
Ozone: 102.84 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:12 AM
Sunset: 5:18 PM
Daylight: 10 hrs 12 mins
Moonrise: 12:40 AM
Moon Transit: 8:35 PM
Moonset: 3:25 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

3:25 AM - 5:55 AM
8:05 PM - 10:35 PM

Minor Periods

12:10 AM - 1:40 PM
2:55 AM - 4:25 AM

Action Rating: 2 out of 5

Thursday, January 29, 2026

Weather Forecast

Sunny
48.6°F
33.6°F
39.7°F
39%
0 in
0%
0%
9.6 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 2.8 μg/m3
PM10: 4.15 μg/m3
Carbon Monoxide: 135.88 μg/m3
Nitrogen Dioxide: 1.89 μg/m3
Sulphur Dioxide: 2.41 μg/m3
Ozone: 101.16 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:12 AM
Sunset: 5:19 PM
Daylight: 10 hrs 13 mins
Moonrise: 1:41 PM
Moon Transit: 9:40 PM
Moonset: 4:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

4:30 AM - 7:00 AM
9:10 PM - 11:40 PM

Minor Periods

1:11 PM - 2:41 PM
4:05 AM - 5:35 AM

Action Rating: 3 out of 5

Friday, January 30, 2026

Weather Forecast

Cloudy
53.2°F
36.1°F
42.8°F
44%
0 in
0%
0%
6.7 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 4.57 μg/m3
PM10: 6.85 μg/m3
Carbon Monoxide: 132.64 μg/m3
Nitrogen Dioxide: 1.85 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 102.24 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:12 AM
Sunset: 5:20 PM
Daylight: 10 hrs 15 mins
Moonrise: 2:53 PM
Moon Transit: 10:44 PM
Moonset: 5:36 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

5:33 AM - 8:03 AM
12:00 AM - 12:00 AM

Minor Periods

2:23 PM - 3:53 PM
5:06 AM - 6:36 AM

Action Rating: 3 out of 5

Saturday, January 31, 2026

Weather Forecast

Sunny
51.4°F
34.3°F
40.5°F
42%
0 in
0%
0%
7.6 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 5.26 μg/m3
PM10: 7.26 μg/m3
Carbon Monoxide: 125.12 μg/m3
Nitrogen Dioxide: 1.51 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 107.64 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:12 AM
Sunset: 5:21 PM
Daylight: 10 hrs 17 mins
Moonrise: 4:08 PM
Moon Transit: 11:43 PM
Moonset: 6:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

6:36 AM - 9:06 AM
12:00 AM - 12:00 AM

Minor Periods

3:38 PM - 5:08 PM
5:57 AM - 7:27 AM

Action Rating: 5 out of 5

Sunday, February 1, 2026

Weather Forecast

Sunny
50.1°F
32.4°F
37.7°F
43%
0 in
0%
0%
7.2 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 5.09 μg/m3
PM10: 6.48 μg/m3
Carbon Monoxide: 132.6 μg/m3
Nitrogen Dioxide: 1.91 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 104.08 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:12 AM
Sunset: 5:22 PM
Daylight: 10 hrs 19 mins
Moonrise: 5:23 PM
Moon Transit: 12:00 AM
Moonset: 7:07 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:33 AM - 10:03 AM

Minor Periods

4:53 PM - 6:23 PM
6:37 AM - 8:07 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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