Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

45.3°F

Measurement Time: Friday, January 30, 2026, 11:45 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

52.1°F
Sunny
Sunny
52.5°F
52.1°F
14%
ENE 7.2 mph
15 mph
52.5°F
4.1°F
0 in
0%
9 mi
1025 mbar
0.3

Five Day Weather Forecast

Sunny
Sat
H: 75°F
L: 45°F
Partly Cloudy
Sun
H: 66°F
L: 42°F
Sunny
Mon
H: 66°F
L: 40°F
Sunny
Tue
H: 69°F
L: 41°F
Sunny
Wed
H: 70°F
L: 42°F

Air Quality

AQI: 1 - Good
PM2.5: 10.95 μg/m3
PM10: 14.25 μg/m3
Carbon Monoxide: 151.85 μg/m3
Nitrogen Dioxide: 2.35 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 96 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:13 AM
Sunset: 5:22 PM
Daylight: 10 hrs 17 mins
Moonrise: 4:09 PM
Moon Transit: 11:44 PM
Moonset: 6:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

6:35 AM - 9:05 AM
12:00 AM - 12:00 AM

Minor Periods

3:39 PM - 5:09 PM
5:58 AM - 7:28 AM

Action Rating: 5 out of 5

Dense Fog Advisory issued January 30 at 12:45PM PST until January 31 at 12:00PM PST by NWS Sacramento CA

Effective: Fri January 30, 2026, 12:45 PM
Expires: Sat January 31, 2026, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carquinez Strait and Delta, Central/Southern Sacramento Valley, Northern San Joaquin Valley. * WHEN...From midnight tonight 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 30 at 8:37PM PST until January 31 at 12:00PM PST by NWS Hanford CA

Effective: Fri January 30, 2026, 8:37 PM
Expires: Sat January 31, 2026, 8:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. Worst case scenario, visibilities down to zero. * WHERE...San Joaquin Valley. * 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, 180 and 198.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Saturday, January 31, 2026

Weather Forecast

Sunny
74.7°F
44.8°F
59.4°F
22%
0 in
0%
0%
8.1 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 9.81 μg/m3
PM10: 13.22 μg/m3
Carbon Monoxide: 151.37 μg/m3
Nitrogen Dioxide: 5.11 μg/m3
Sulphur Dioxide: 1.53 μg/m3
Ozone: 65.96 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:13 AM
Sunset: 5:22 PM
Daylight: 10 hrs 17 mins
Moonrise: 4:09 PM
Moon Transit: 11:44 PM
Moonset: 6:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

6:35 AM - 9:05 AM
12:00 AM - 12:00 AM

Minor Periods

3:39 PM - 5:09 PM
5:58 AM - 7:28 AM

Action Rating: 5 out of 5

Sunday, February 1, 2026

Weather Forecast

Partly Cloudy
65.8°F
41.9°F
50.3°F
38%
0 in
0%
0%
7.8 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 10.5 μg/m3
PM10: 13.44 μg/m3
Carbon Monoxide: 149.93 μg/m3
Nitrogen Dioxide: 4.87 μg/m3
Sulphur Dioxide: 1.64 μg/m3
Ozone: 73.6 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:13 AM
Sunset: 5:23 PM
Daylight: 10 hrs 19 mins
Moonrise: 5:24 PM
Moon Transit: 12:00 AM
Moonset: 7:08 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

4:54 PM - 6:24 PM
6:38 AM - 8:08 AM

Action Rating: 6 out of 5

Monday, February 2, 2026

Weather Forecast

Sunny
65.8°F
40.1°F
50.9°F
42%
0 in
0%
0%
6.9 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 9.22 μg/m3
PM10: 10.84 μg/m3
Carbon Monoxide: 153.17 μg/m3
Nitrogen Dioxide: 5.77 μg/m3
Sulphur Dioxide: 1.69 μg/m3
Ozone: 65.08 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:13 AM
Sunset: 5:24 PM
Daylight: 10 hrs 21 mins
Moonrise: 6:36 PM
Moon Transit: 12:38 AM
Moonset: 7:40 AM
Moon Phase: Full
Moon Illumination: 99.4%

Best Times for Fishing or Hunting

Major Periods

12:08 AM - 2:38 AM
8:25 AM - 10:55 AM

Minor Periods

6:06 PM - 7:36 PM
7:10 AM - 8:40 AM

Action Rating: 4 out of 5

Tuesday, February 3, 2026

Weather Forecast

Sunny
68.6°F
40.5°F
49.5°F
42%
0 in
0%
0%
6.9 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 9.21 μg/m3
PM10: 10.32 μg/m3
Carbon Monoxide: 158.59 μg/m3
Nitrogen Dioxide: 5.71 μg/m3
Sulphur Dioxide: 1.84 μg/m3
Ozone: 63.92 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:13 AM
Sunset: 5:25 PM
Daylight: 10 hrs 23 mins
Moonrise: 7:44 PM
Moon Transit: 1:27 AM
Moonset: 8:08 AM
Moon Phase: Full
Moon Illumination: 96.3%

Best Times for Fishing or Hunting

Major Periods

12:57 AM - 3:27 AM
9:13 AM - 11:43 AM

Minor Periods

7:14 PM - 8:44 PM
7:38 AM - 9:08 AM

Action Rating: 3 out of 5

Wednesday, February 4, 2026

Weather Forecast

Sunny
70.2°F
42.3°F
52.7°F
36%
0 in
0%
0%
7.4 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 8.21 μg/m3
PM10: 8.9 μg/m3
Carbon Monoxide: 186.5 μg/m3
Nitrogen Dioxide: 6.14 μg/m3
Sulphur Dioxide: 1.62 μg/m3
Ozone: 59.69 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:13 AM
Sunset: 5:27 PM
Daylight: 10 hrs 25 mins
Moonrise: 8:49 PM
Moon Transit: 2:13 AM
Moonset: 8:33 AM
Moon Phase: Full
Moon Illumination: 90.9%

Best Times for Fishing or Hunting

Major Periods

1:43 AM - 4:13 AM
9:58 AM - 12:28 AM

Minor Periods

8:19 PM - 9:49 PM
8:03 AM - 9:33 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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