Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

34.7°F

Measurement Time: Monday, January 26, 2026, 1:30 AM PST

Temperature Locations

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Local Points of Interest

Happy Isles Bridge; Yosemite National Park

Merced River

Station Name: MERCED R A HAPPY ISLES BRIDGE NR YOSEMITE CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 4,095 feet

Nearest Address:
Happy Isle Loop Rd
Yosemite Valley, CA 95389
Mariposa County

GPS Coordinates: 37.73131496, -119.5590514

Nearby Water Temperatures

Tuolumne River, Groveland, CA (13.9 mi)
Tuolumne River, Groveland, CA (19.3 mi)
Tuolumne River, Groveland, CA (23.5 mi)
Tuolumne River, Groveland, CA (24.7 mi)
Cherry Creek, Groveland, CA (25.5 mi)
Middle Fork San Joaquin River, Mammoth Lakes, CA (26.7 mi)
Deadman Creek, Mammoth Lakes, CA (33.9 mi)
Hot Creek, Mammoth Lakes, CA (38.6 mi)
Hot Creek, Mammoth Lakes, CA (39.2 mi)
Hot Creek, Mammoth Lakes, CA (40.8 mi)
San Joaquin River, Friant, CA (52.4 mi)
Walker Lake, Walker Lake, NV (80.9 mi)
Walker Lake, Walker Lake, NV (83.8 mi)
Trout Creek, South Lake Tahoe, CA (85.1 mi)
Upper Truckee River, South Lake Tahoe, CA (85.6 mi)

Weather for Yosemite Valley, California

Current Weather

21.2°F
Sunny
Sunny
16.2°F
36.8°F
68%
SSE 3.6 mph
5.4 mph
32.6°F
18.6°F
0 in
0%
9 mi
1029 mbar
1.9

Five Day Weather Forecast

Partly Cloudy
Mon
H: 41°F
L: 33°F
Sunny
Tue
H: 45°F
L: 30°F
Overcast
Wed
H: 47°F
L: 38°F
Sunny
Thu
H: 49°F
L: 38°F
Sunny
Fri
H: 56°F
L: 38°F

Air Quality

AQI: 1 - Good
PM2.5: 4.85 μg/m3
PM10: 5.35 μg/m3
Carbon Monoxide: 143.85 μg/m3
Nitrogen Dioxide: 5.15 μg/m3
Sulphur Dioxide: 2.05 μg/m3
Ozone: 87 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:10 AM
Sunset: 5:15 PM
Daylight: 10 hrs 9 mins
Moonrise: 11:09 AM
Moon Transit: 6:33 PM
Moonset: 12:54 AM
Moon Phase: First Quarter
Moon Illumination: 57.1%

Best Times for Fishing or Hunting

Major Periods

1:30 AM - 4:00 AM
6:03 PM - 8:33 PM

Minor Periods

10:39 AM - 12:09 AM
12:24 AM - 1:54 AM

Action Rating: 2 out of 5

Dense Fog Advisory issued January 26 at 4:10AM PST until January 26 at 11:00AM PST by NWS Hanford CA

Effective: Mon January 26, 2026, 4:10 AM
Expires: Mon January 26, 2026, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...San Joaquin Valley. * WHEN...Until 11 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.
Monday, January 26, 2026

Weather Forecast

Partly Cloudy
41.4°F
33.4°F
36.7°F
42%
0 in
0%
0%
7.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 5.85 μg/m3
PM10: 6.56 μg/m3
Carbon Monoxide: 141.89 μg/m3
Nitrogen Dioxide: 3.43 μg/m3
Sulphur Dioxide: 1.91 μg/m3
Ozone: 77.76 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:10 AM
Sunset: 5:15 PM
Daylight: 10 hrs 9 mins
Moonrise: 11:09 AM
Moon Transit: 6:33 PM
Moonset: 12:54 AM
Moon Phase: First Quarter
Moon Illumination: 57.1%

Best Times for Fishing or Hunting

Major Periods

1:30 AM - 4:00 AM
6:03 PM - 8:33 PM

Minor Periods

10:39 AM - 12:09 AM
12:24 AM - 1:54 AM

Action Rating: 2 out of 5

Tuesday, January 27, 2026

Weather Forecast

Sunny
45.3°F
29.7°F
37.8°F
30%
0 in
0%
0%
8.1 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 3.73 μg/m3
PM10: 4.05 μg/m3
Carbon Monoxide: 141.57 μg/m3
Nitrogen Dioxide: 3.41 μg/m3
Sulphur Dioxide: 1.9 μg/m3
Ozone: 84.56 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:11 AM
Sunset: 5:16 PM
Daylight: 10 hrs 11 mins
Moonrise: 11:49 AM
Moon Transit: 7:32 PM
Moonset: 2:09 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

2:25 AM - 4:55 AM
7:02 PM - 9:32 PM

Minor Periods

11:19 AM - 12:49 AM
1:39 AM - 3:09 AM

Action Rating: 2 out of 5

Wednesday, January 28, 2026

Weather Forecast

Overcast
46.6°F
37.8°F
41.7°F
36%
0 in
0%
0%
7.6 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 5.59 μg/m3
PM10: 6.23 μg/m3
Carbon Monoxide: 129.29 μg/m3
Nitrogen Dioxide: 3.47 μg/m3
Sulphur Dioxide: 1.9 μg/m3
Ozone: 86.24 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:11 AM
Sunset: 5:17 PM
Daylight: 10 hrs 12 mins
Moonrise: 12:40 AM
Moon Transit: 8:34 PM
Moonset: 3:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

3:26 AM - 5:56 AM
8:04 PM - 10:34 PM

Minor Periods

12:10 AM - 1:40 PM
2:53 AM - 4:23 AM

Action Rating: 2 out of 5

Thursday, January 29, 2026

Weather Forecast

Sunny
49.4°F
37.6°F
41.6°F
50%
0 in
0%
0%
8.7 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 3.01 μg/m3
PM10: 3.86 μg/m3
Carbon Monoxide: 123.28 μg/m3
Nitrogen Dioxide: 3.66 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 86.4 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:11 AM
Sunset: 5:19 PM
Daylight: 10 hrs 14 mins
Moonrise: 1:41 PM
Moon Transit: 9:39 PM
Moonset: 4:34 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

4:30 AM - 7:00 AM
9:09 PM - 11:39 PM

Minor Periods

1:11 PM - 2:41 PM
4:04 AM - 5:34 AM

Action Rating: 3 out of 5

Friday, January 30, 2026

Weather Forecast

Sunny
55.9°F
38.1°F
45.3°F
46%
0 in
0%
0%
8.5 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.02 μg/m3
PM10: 5.43 μg/m3
Carbon Monoxide: 160.6 μg/m3
Nitrogen Dioxide: 4.56 μg/m3
Sulphur Dioxide: 1.43 μg/m3
Ozone: 73.38 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:11 AM
Sunset: 5:20 PM
Daylight: 10 hrs 16 mins
Moonrise: 2:52 PM
Moon Transit: 10:43 PM
Moonset: 5:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

5:34 AM - 8:04 AM
12:00 AM - 12:00 AM

Minor Periods

2:22 PM - 3:52 PM
5:05 AM - 6:35 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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