Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

44.1°F

Measurement Time: Friday, February 27, 2026, 7:30 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

57.4°F
Cloudy
Cloudy
57.1°F
53.2°F
41%
WSW 4.5 mph
6.7 mph
52.6°F
42.6°F
0 in
0%
9 mi
1025 mbar
0.8

Five Day Weather Forecast

Partly Cloudy
Fri
H: 55°F
L: 39°F
Partly Cloudy
Sat
H: 57°F
L: 41°F
Patchy rain nearby
Sun
H: 43°F
L: 35°F
Moderate or heavy snow showers
Mon
H: 39°F
L: 26°F
Sunny
Tue
H: 49°F
L: 33°F

Air Quality

AQI: 1 - Good
PM2.5: 3.65 μg/m3
PM10: 3.85 μg/m3
Carbon Monoxide: 102.85 μg/m3
Nitrogen Dioxide: 5.25 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 62 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 12:10 AM
Sunset: 5:50 PM
Daylight: 11 hrs 18 mins
Moonrise: 1:49 PM
Moon Transit: 9:30 PM
Moonset: 4:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

4:25 AM - 6:55 AM
9:00 PM - 11:30 PM

Minor Periods

1:19 PM - 2:49 PM
3:50 AM - 5:20 AM

Action Rating: 3 out of 5

Dense Fog Advisory issued February 27 at 3:28AM PST until February 27 at 10:00AM PST by NWS Hanford CA

Effective: Fri February 27, 2026, 3:28 AM
Expires: Fri February 27, 2026, 10:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Bakersfield, Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Fresno-Clovis, Hanford - Corcoran - Lemoore, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Southeast San Joaquin Valley, and Visalia - Porterville - Reedley. * 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.
Friday, February 27, 2026

Weather Forecast

Partly Cloudy
54.7°F
38.8°F
49.8°F
64%
0 in
0%
0%
7.2 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 3.94 μg/m3
PM10: 4.58 μg/m3
Carbon Monoxide: 112.25 μg/m3
Nitrogen Dioxide: 3.51 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 71.44 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 12:10 AM
Sunset: 5:50 PM
Daylight: 11 hrs 18 mins
Moonrise: 1:49 PM
Moon Transit: 9:30 PM
Moonset: 4:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

4:25 AM - 6:55 AM
9:00 PM - 11:30 PM

Minor Periods

1:19 PM - 2:49 PM
3:50 AM - 5:20 AM

Action Rating: 3 out of 5

Saturday, February 28, 2026

Weather Forecast

Partly Cloudy
56.7°F
41.2°F
49.6°F
57%
0 in
0%
0%
11 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 3.56 μg/m3
PM10: 4.01 μg/m3
Carbon Monoxide: 106.21 μg/m3
Nitrogen Dioxide: 3.56 μg/m3
Sulphur Dioxide: 1.36 μg/m3
Ozone: 73.4 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 12:10 AM
Sunset: 5:51 PM
Daylight: 11 hrs 20 mins
Moonrise: 3:03 PM
Moon Transit: 10:25 PM
Moonset: 5:02 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

5:23 AM - 7:53 AM
12:00 AM - 12:00 AM

Minor Periods

2:33 PM - 4:03 PM
4:32 AM - 6:02 AM

Action Rating: 3 out of 5

Sunday, March 1, 2026

Weather Forecast

Patchy rain nearby
43.2°F
35.3°F
40°F
72%
0.08 in
89%
0%
10.1 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 7.02 μg/m3
PM10: 8.19 μg/m3
Carbon Monoxide: 114.85 μg/m3
Nitrogen Dioxide: 3.09 μg/m3
Sulphur Dioxide: 1.82 μg/m3
Ozone: 82.64 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 12:10 AM
Sunset: 5:52 PM
Daylight: 11 hrs 22 mins
Moonrise: 4:15 PM
Moon Transit: 11:16 PM
Moonset: 5:37 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

6:16 AM - 8:46 AM
12:00 AM - 12:00 AM

Minor Periods

3:45 PM - 5:15 PM
5:07 AM - 6:37 AM

Action Rating: 4 out of 5

Monday, March 2, 2026

Weather Forecast

Moderate or heavy snow showers
39.4°F
25.9°F
32.9°F
86%
0.36 in
77%
16%
6.5 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 5.38 μg/m3
PM10: 6.34 μg/m3
Carbon Monoxide: 131.28 μg/m3
Nitrogen Dioxide: 2.53 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 87.2 μg/m3

Astronomical

Sunrise: 6:28 AM
Sun Transit: 12:10 AM
Sunset: 5:53 PM
Daylight: 11 hrs 25 mins
Moonrise: 5:23 PM
Moon Transit: 12:00 AM
Moonset: 6:06 AM
Moon Phase: Full
Moon Illumination: 99.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:05 AM - 9:35 AM

Minor Periods

4:53 PM - 6:23 PM
5:36 AM - 7:06 AM

Action Rating: 4 out of 5

Tuesday, March 3, 2026

Weather Forecast

Sunny
49°F
33.2°F
39.9°F
64%
0 in
0%
0%
6.7 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.56 μg/m3
PM10: 4.5 μg/m3
Carbon Monoxide: 154.36 μg/m3
Nitrogen Dioxide: 4.67 μg/m3
Sulphur Dioxide: 1.13 μg/m3
Ozone: 84.46 μg/m3

Astronomical

Sunrise: 6:27 AM
Sun Transit: 12:10 AM
Sunset: 5:54 PM
Daylight: 11 hrs 27 mins
Moonrise: 6:29 PM
Moon Transit: 12:03 AM
Moonset: 6:32 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:51 AM - 10:21 AM

Minor Periods

5:59 PM - 7:29 PM
6:02 AM - 7:32 AM

Action Rating: 5 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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