Water Temperature of the Tuolumne River in Groveland, CA

Current Water Temperature

50.9°F

Measurement Time: Friday, May 15, 2026, 9:30 PM PDT

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

56.5°F
Clear
Clear
57°F
56.5°F
38%
ENE 4.3 mph
8.9 mph
57°F
31°F
0 in
0%
6 mi
1012 mbar
0

Five Day Weather Forecast

Sunny
Sat
H: 77°F
L: 46°F
Sunny
Sun
H: 71°F
L: 44°F
Sunny
Mon
H: 74°F
L: 42°F
Sunny
Tue
H: 79°F
L: 47°F
Sunny
Wed
H: 84°F
L: 49°F

Air Quality

AQI: 1 - Good
PM2.5: 8.15 μg/m3
PM10: 25.95 μg/m3
Carbon Monoxide: 138.85 μg/m3
Nitrogen Dioxide: 2.35 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 99 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 12:56 AM
Sunset: 8:04 PM
Daylight: 14 hrs 16 mins
Moonrise: 5:16 AM
Moon Transit: 12:50 AM
Moonset: 8:35 PM
Moon Phase: New
Moon Illumination: 2.0%

Best Times for Fishing or Hunting

Major Periods

8:42 PM - 11:12 PM
12:20 AM - 2:50 PM

Minor Periods

8:05 PM - 9:35 PM
4:46 AM - 6:16 AM

Action Rating: 5 out of 5

Red Flag Warning issued May 15 at 10:51AM PDT until May 18 at 8:00PM PDT by NWS Sacramento CA

Effective: Fri May 15, 2026, 10:51 AM
Expires: Sat May 16, 2026, 8:00 PM

The National Weather Service in Sacramento has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 5 AM Saturday to 8 PM PDT Monday. The Fire Weather Watch is no longer in effect. * Winds...North winds 20 to 30 mph. Gusts 35 to 45 mph, locally up to 50 mph around the Delta and the far western Sacramento Valley. * Humidity...Daytime minimum humidities of 7 to 15%; Overnight maximum relative humidities 30 to 55%. * Highest Threat...Along and west of the Interstate 5 corridor in the Sacramento Valley. Strongest winds are expected Saturday night through Sunday. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity. Outdoor burning is not recommended

A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.


Red Flag Warning issued May 15 at 7:52PM PDT until May 18 at 8:00PM PDT by NWS Hanford CA

Effective: Fri May 15, 2026, 7:52 PM
Expires: Sat May 16, 2026, 4:00 AM

* AFFECTED AREA...Fire weather zone 579 West Side Hills on the Coastal Range. Fire weather zone 580 San Joaquin Valley. * WIND...GUSTING TO 35 MPH SATURDAY AND SUNDAY. * HUMIDITY...20% OR LESS SATURDAY AND SUNDAY THEN 15% OR LESS MONDAY * HIGHEST THREAT...FAST-MOVING GRASS FIRES * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
Saturday, May 16, 2026

Weather Forecast

Sunny
76.6°F
46.4°F
62.3°F
38%
0 in
0%
0%
10.7 mph
8.4


Air Quality

AQI: 1 - Good
PM2.5: 5.66 μg/m3
PM10: 19.32 μg/m3
Carbon Monoxide: 132.33 μg/m3
Nitrogen Dioxide: 3.79 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 86.28 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 12:56 AM
Sunset: 8:04 PM
Daylight: 14 hrs 16 mins
Moonrise: 5:16 AM
Moon Transit: 12:50 AM
Moonset: 8:35 PM
Moon Phase: New
Moon Illumination: 2.0%

Best Times for Fishing or Hunting

Major Periods

8:42 PM - 11:12 PM
12:20 AM - 2:50 PM

Minor Periods

8:05 PM - 9:35 PM
4:46 AM - 6:16 AM

Action Rating: 5 out of 5

Sunday, May 17, 2026

Weather Forecast

Sunny
71.4°F
43.5°F
56.9°F
45%
0 in
0%
0%
10.3 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 5.83 μg/m3
PM10: 24.66 μg/m3
Carbon Monoxide: 133.45 μg/m3
Nitrogen Dioxide: 3.51 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 78.36 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:56 AM
Sunset: 8:05 PM
Daylight: 14 hrs 17 mins
Moonrise: 6:05 AM
Moon Transit: 1:55 PM
Moonset: 9:52 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:25 PM - 3:55 PM

Minor Periods

9:22 PM - 10:52 PM
5:35 AM - 7:05 AM

Action Rating: 4 out of 5

Monday, May 18, 2026

Weather Forecast

Sunny
73.6°F
41.9°F
57.7°F
31%
0 in
0%
0%
9.6 mph
9.1


Air Quality

AQI: 1 - Good
PM2.5: 5.05 μg/m3
PM10: 19.69 μg/m3
Carbon Monoxide: 123.81 μg/m3
Nitrogen Dioxide: 2.54 μg/m3
Sulphur Dioxide: 1.73 μg/m3
Ozone: 92.16 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:56 AM
Sunset: 8:06 PM
Daylight: 14 hrs 19 mins
Moonrise: 7:04 AM
Moon Transit: 3:02 PM
Moonset: 11:00 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:32 PM - 5:02 PM

Minor Periods

10:30 PM - 12:00 PM
6:34 AM - 8:04 AM

Action Rating: 3 out of 5

Tuesday, May 19, 2026

Weather Forecast

Sunny
79.3°F
46.8°F
62.3°F
35%
0 in
0%
0%
9.8 mph
9.1


Air Quality

AQI: 1 - Good
PM2.5: 5.25 μg/m3
PM10: 15.2 μg/m3
Carbon Monoxide: 125.25 μg/m3
Nitrogen Dioxide: 3.29 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 87.4 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:56 AM
Sunset: 8:07 PM
Daylight: 14 hrs 21 mins
Moonrise: 8:14 AM
Moon Transit: 4:08 PM
Moonset: 11:56 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:38 PM - 6:08 PM

Minor Periods

12:00 AM - 12:00 AM
7:44 AM - 9:14 AM

Action Rating: 2 out of 5

Wednesday, May 20, 2026

Weather Forecast

Sunny
84.3°F
49.4°F
62.4°F
34%
0 in
0%
0%
8.9 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.87 μg/m3
PM10: 10.9 μg/m3
Carbon Monoxide: 142.21 μg/m3
Nitrogen Dioxide: 4.9 μg/m3
Sulphur Dioxide: 1.2 μg/m3
Ozone: 74.77 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:56 AM
Sunset: 8:08 PM
Daylight: 14 hrs 22 mins
Moonrise: 9:29 AM
Moon Transit: 5:09 PM
Moonset: 12:56 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
4:39 PM - 7:09 PM

Minor Periods

8:59 AM - 10:29 AM
12:00 AM - 12:00 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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