Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

44.4°F

Measurement Time: Friday, January 16, 2026, 8:45 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

34.1°F
Clear
Clear
25.8°F
34.1°F
26%
ENE 7.2 mph
15 mph
25.8°F
3.1°F
0 in
0%
9 mi
1021 mbar
0

Five Day Weather Forecast

Sunny
Sat
H: 68°F
L: 34°F
Sunny
Sun
H: 67°F
L: 38°F
Sunny
Mon
H: 65°F
L: 37°F
Partly Cloudy
Tue
H: 65°F
L: 38°F
Partly Cloudy
Wed
H: 58°F
L: 38°F

Air Quality

PM2.5: 1.65 μg/m3
PM10: 1.95 μg/m3
Carbon Monoxide: 126.85 μg/m3
Nitrogen Dioxide: 2.05 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 80 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:10 AM
Sunset: 5:07 PM
Daylight: 9 hrs 53 mins
Moonrise: 6:48 AM
Moon Transit: 11:22 AM
Moonset: 4:02 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

7:10 PM - 9:40 PM
10:52 AM - 1:22 PM

Minor Periods

3:32 PM - 5:02 PM
6:18 AM - 7:48 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued January 17 at 1:34AM PST until January 17 at 10:00AM PST by NWS Sacramento CA

Effective: Sat January 17, 2026, 1:34 AM
Expires: Sat January 17, 2026, 10:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Northern San Joaquin Valley, Southern Sacramento Valley and the Delta. Densest fog is expected near the Sacramento and San Joaquin rivers and the Delta. * WHEN...Until 10 AM PST this morning. * 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 16 at 3:05PM PST until January 17 at 12:00PM PST by NWS Hanford CA

Effective: Fri January 16, 2026, 3:05 PM
Expires: Fri January 16, 2026, 11:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Buttonwillow - Lost Hills - I5, Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Hanford - Corcoran - Lemoore, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Visalia - Porterville - Reedley, and West Side of Fresno and Kings Counties. * WHEN...From 8 PM this evening to noon PST Saturday. * 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 16 at 6:06PM PST until January 17 at 12:00PM PST by NWS Hanford CA

Effective: Fri January 16, 2026, 6:06 PM
Expires: Sat January 17, 2026, 2:15 AM

* WHAT...Visibilities likely less than 200 feet to near zero in dense fog. * WHERE...A portion of central California. * WHEN...Until noon PST Saturday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Highways include, but are not limited to, Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 168, 180, and 198.

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


Dense Fog Advisory issued January 17 at 1:48AM PST until January 17 at 12:00PM PST by NWS Hanford CA

Effective: Sat January 17, 2026, 1:48 AM
Expires: Sat January 17, 2026, 10:00 AM

* WHAT...Visibilities likely less than 200 feet to near zero in dense fog. * WHERE...Buttonwillow - Lost Hills - I5, Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Hanford - Corcoran - Lemoore, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Visalia - Porterville - Reedley, and West Side of Fresno and Kings Counties. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Highways include, but are not limited to, Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 168, 180, and 198.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Saturday, January 17, 2026

Weather Forecast

Sunny
67.6°F
33.6°F
45°F
40%
0 in
0%
0%
7.4 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.21 μg/m3
PM10: 2.43 μg/m3
Carbon Monoxide: 131.9 μg/m3
Nitrogen Dioxide: 4.1 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 65.16 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:10 AM
Sunset: 5:07 PM
Daylight: 9 hrs 53 mins
Moonrise: 6:48 AM
Moon Transit: 11:22 AM
Moonset: 4:02 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

7:10 PM - 9:40 PM
10:52 AM - 1:22 PM

Minor Periods

3:32 PM - 5:02 PM
6:18 AM - 7:48 AM

Action Rating: 4 out of 5

Sunday, January 18, 2026

Weather Forecast

Sunny
66.9°F
38.4°F
48°F
39%
0 in
0%
0%
6.9 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.46 μg/m3
PM10: 2.59 μg/m3
Carbon Monoxide: 164.98 μg/m3
Nitrogen Dioxide: 5.87 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 50.69 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:10 AM
Sunset: 5:08 PM
Daylight: 9 hrs 55 mins
Moonrise: 7:27 AM
Moon Transit: 12:14 AM
Moonset: 5:06 PM
Moon Phase: New
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

8:01 PM - 10:31 PM
11:44 AM - 2:14 PM

Minor Periods

4:36 PM - 6:06 PM
6:57 AM - 8:27 AM

Action Rating: 4 out of 5

Monday, January 19, 2026

Weather Forecast

Sunny
65.2°F
37.3°F
44.8°F
41%
0 in
0%
0%
6.5 mph
0


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:10 AM
Sunset: 5:09 PM
Daylight: 9 hrs 56 mins
Moonrise: 8:02 AM
Moon Transit: 1:03 PM
Moonset: 6:12 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

8:49 PM - 11:19 PM
12:33 AM - 3:03 PM

Minor Periods

5:42 PM - 7:12 PM
7:32 AM - 9:02 AM

Action Rating: 4 out of 5

Tuesday, January 20, 2026

Weather Forecast

Partly Cloudy
64.7°F
38.2°F
47.5°F
41%
0 in
0%
0%
6.9 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:10 AM
Sunset: 5:10 PM
Daylight: 9 hrs 58 mins
Moonrise: 8:31 AM
Moon Transit: 1:50 PM
Moonset: 7:18 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:20 PM - 3:50 PM

Minor Periods

6:48 PM - 8:18 PM
8:01 AM - 9:31 AM

Action Rating: 3 out of 5

Wednesday, January 21, 2026

Weather Forecast

Partly Cloudy
57.7°F
38.3°F
45.9°F
48%
0 in
0%
0%
4.9 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:11 AM
Sunset: 5:11 PM
Daylight: 10 hrs mins
Moonrise: 8:57 AM
Moon Transit: 2:35 PM
Moonset: 8:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:05 PM - 4:35 PM

Minor Periods

7:54 PM - 9:24 PM
8:27 AM - 9:57 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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