Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

44.1°F

Measurement Time: Friday, January 9, 2026, 5:45 PM PST

Temperature Locations

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Local Points of Interest

Stanislaus National Forest; Mather, CA; Harden Flat, CA

Tuolumne River

Station Name: TUOLUMNE R AB EARLY INTAKE NR MATHER CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 2,493 feet

Nearest Address:
Preston Falls Trail
Groveland, CA 95321
Tuolumne County

GPS Coordinates: 37.87936848, -119.947126

Nearby Water Temperatures

Tuolumne River, Groveland, CA (1.3 mi)
Cherry Creek, Groveland, CA (6.3 mi)
Tuolumne River, Groveland, CA (9.1 mi)
Tuolumne River, Groveland, CA (15.9 mi)
Merced River, Yosemite Valley, CA (23.5 mi)
Middle Fork San Joaquin River, Mammoth Lakes, CA (50 mi)
Deadman Creek, Mammoth Lakes, CA (55.7 mi)
Hot Creek, Mammoth Lakes, CA (61.6 mi)
Hot Creek, Mammoth Lakes, CA (62.1 mi)
San Joaquin River, Friant, CA (63 mi)
Hot Creek, Mammoth Lakes, CA (63.4 mi)
Trout Creek, South Lake Tahoe, CA (71.9 mi)
Upper Truckee River, South Lake Tahoe, CA (72.1 mi)
General Creek, Tahoma, CA (81.5 mi)
South Fork American River, Rescue, CA (83.9 mi)

Weather for Groveland, California

Current Weather

42.2°F
Clear
Clear
42.2°F
42.2°F
36%
ENE 7.4 mph
15.5 mph
42.2°F
17.4°F
0 in
0%
6 mi
1033 mbar
0

Five Day Weather Forecast

Sunny
Sat
H: 58°F
L: 28°F
Sunny
Sun
H: 62°F
L: 29°F
Sunny
Mon
H: 63°F
L: 33°F
Sunny
Tue
H: 68°F
L: 35°F
Sunny
Wed
H: 69°F
L: 38°F

Air Quality

AQI: 1 - Good
PM2.5: 2.45 μg/m3
PM10: 2.55 μg/m3
Carbon Monoxide: 166.85 μg/m3
Nitrogen Dioxide: 3.85 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 68 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:07 AM
Sunset: 5:00 PM
Daylight: 9 hrs 44 mins
Moonrise: 12:06 AM
Moon Transit: 5:45 AM
Moonset: 11:17 AM
Moon Phase: Last Quarter
Moon Illumination: 46.5%

Best Times for Fishing or Hunting

Major Periods

5:15 AM - 7:45 AM
1:30 PM - 4:00 PM

Minor Periods

10:47 AM - 12:17 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Freeze Warning issued January 9 at 12:03PM PST until January 10 at 10:00AM PST by NWS Hanford CA

Effective: Fri January 9, 2026, 12:03 PM
Expires: Fri January 9, 2026, 8:30 PM

* WHAT...Morning low temperatures as low as 31 degrees in the San Joaquin Valley. * WHERE...Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Hanford - Corcoran - Lemoore, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Southeast San Joaquin Valley, and Visalia - Porterville - Reedley. * WHEN...Until 10 AM PST Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.


Freeze Warning issued January 9 at 8:18PM PST until January 10 at 10:00AM PST by NWS Hanford CA

Effective: Fri January 9, 2026, 8:18 PM
Expires: Sat January 10, 2026, 4:30 AM

* WHAT...Morning low temperatures as low as 31 degrees in the San Joaquin Valley. * WHERE...Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Hanford - Corcoran - Lemoore, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Southeast San Joaquin Valley, and Visalia - Porterville - Reedley. * WHEN...Until 10 AM PST Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.
Saturday, January 10, 2026

Weather Forecast

Sunny
57.9°F
28.4°F
43.8°F
46%
0 in
0%
0%
7.8 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.58 μg/m3
PM10: 3.03 μg/m3
Carbon Monoxide: 169.33 μg/m3
Nitrogen Dioxide: 4.61 μg/m3
Sulphur Dioxide: 1.47 μg/m3
Ozone: 70.12 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:07 AM
Sunset: 5:00 PM
Daylight: 9 hrs 44 mins
Moonrise: 12:06 AM
Moon Transit: 5:45 AM
Moonset: 11:17 AM
Moon Phase: Last Quarter
Moon Illumination: 46.5%

Best Times for Fishing or Hunting

Major Periods

5:15 AM - 7:45 AM
1:30 PM - 4:00 PM

Minor Periods

10:47 AM - 12:17 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, January 11, 2026

Weather Forecast

Sunny
62.4°F
28.8°F
40.9°F
34%
0 in
0%
0%
7.4 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.6 μg/m3
PM10: 2.79 μg/m3
Carbon Monoxide: 155.69 μg/m3
Nitrogen Dioxide: 5.5 μg/m3
Sulphur Dioxide: 1.42 μg/m3
Ozone: 62.72 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:07 AM
Sunset: 5:01 PM
Daylight: 9 hrs 46 mins
Moonrise: 1:07 AM
Moon Transit: 6:27 AM
Moonset: 11:41 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

5:57 AM - 8:27 AM
2:12 PM - 4:42 PM

Minor Periods

11:11 AM - 12:41 AM
12:37 AM - 2:07 AM

Action Rating: 3 out of 5

Monday, January 12, 2026

Weather Forecast

Sunny
63.1°F
32.5°F
43.1°F
45%
0 in
0%
0%
8.5 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.71 μg/m3
PM10: 2.82 μg/m3
Carbon Monoxide: 139.77 μg/m3
Nitrogen Dioxide: 4.79 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 58.76 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:08 AM
Sunset: 5:02 PM
Daylight: 9 hrs 47 mins
Moonrise: 2:07 AM
Moon Transit: 7:11 AM
Moonset: 12:10 AM
Moon Phase: Last Quarter
Moon Illumination: 25.0%

Best Times for Fishing or Hunting

Major Periods

6:41 AM - 9:11 AM
2:57 PM - 5:27 PM

Minor Periods

11:40 AM - 1:10 PM
1:37 AM - 3:07 AM

Action Rating: 3 out of 5

Tuesday, January 13, 2026

Weather Forecast

Sunny
68°F
35.4°F
45.6°F
48%
0 in
0%
0%
8.5 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 2.09 μg/m3
PM10: 2.19 μg/m3
Carbon Monoxide: 140.54 μg/m3
Nitrogen Dioxide: 3.73 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 61.2 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:08 AM
Sunset: 5:03 PM
Daylight: 9 hrs 48 mins
Moonrise: 3:08 AM
Moon Transit: 7:57 AM
Moonset: 12:42 AM
Moon Phase: Waning Crescent
Moon Illumination: 15.9%

Best Times for Fishing or Hunting

Major Periods

7:27 AM - 9:57 AM
3:44 PM - 6:14 PM

Minor Periods

12:12 AM - 1:42 PM
2:38 AM - 4:08 AM

Action Rating: 3 out of 5

Wednesday, January 14, 2026

Weather Forecast

Sunny
69.1°F
37.8°F
45.1°F
47%
0 in
0%
0%
8.1 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.44 μg/m3
PM10: 2.67 μg/m3
Carbon Monoxide: 162.33 μg/m3
Nitrogen Dioxide: 5.83 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 53.92 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:08 AM
Sunset: 5:04 PM
Daylight: 9 hrs 49 mins
Moonrise: 4:09 AM
Moon Transit: 8:46 AM
Moonset: 1:21 PM
Moon Phase: Waning Crescent
Moon Illumination: 8.5%

Best Times for Fishing or Hunting

Major Periods

8:16 AM - 10:46 AM
4:33 PM - 7:03 PM

Minor Periods

12:51 AM - 2:21 PM
3:39 AM - 5:09 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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