Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

36.7°F

Measurement Time: Wednesday, January 7, 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

34.2°F
Mist
Mist
30.1°F
29.4°F
44%
WNW 4.5 mph
6.5 mph
22.9°F
28.3°F
0 in
0%
9 mi
1012 mbar
0.6

Five Day Weather Forecast

Mist
Wed
H: 33°F
L: 18°F
Sunny
Thu
H: 39°F
L: 18°F
Sunny
Fri
H: 41°F
L: 25°F
Sunny
Sat
H: 45°F
L: 25°F
Sunny
Sun
H: 49°F
L: 30°F

Air Quality

AQI: 1 - Good
PM2.5: 1.65 μg/m3
PM10: 1.85 μg/m3
Carbon Monoxide: 128.85 μg/m3
Nitrogen Dioxide: 4.75 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 77 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:04 AM
Sunset: 4:56 PM
Daylight: 9 hrs 42 mins
Moonrise: 10:02 PM
Moon Transit: 3:37 AM
Moonset: 10:07 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.6%

Best Times for Fishing or Hunting

Major Periods

3:07 AM - 5:37 AM
11:26 AM - 1:56 PM

Minor Periods

9:32 PM - 11:02 PM
9:37 AM - 11:07 AM

Action Rating: 2 out of 5

Dense Fog Advisory issued January 7 at 12:39AM PST until January 7 at 11:00AM PST by NWS Hanford CA

Effective: Wed January 7, 2026, 12:39 AM
Expires: Wed January 7, 2026, 8:45 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 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.


Dense Fog Advisory issued January 7 at 8:32AM PST until January 7 at 11:00AM PST by NWS Hanford CA

Effective: Wed January 7, 2026, 8:32 AM
Expires: Wed January 7, 2026, 11:00 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 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.
Wednesday, January 7, 2026

Weather Forecast

Mist
33.1°F
18.1°F
25.3°F
90%
0 in
0%
4%
7.8 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 3.03 μg/m3
PM10: 3.59 μg/m3
Carbon Monoxide: 125.09 μg/m3
Nitrogen Dioxide: 3.84 μg/m3
Sulphur Dioxide: 1.16 μg/m3
Ozone: 82.12 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:04 AM
Sunset: 4:56 PM
Daylight: 9 hrs 42 mins
Moonrise: 10:02 PM
Moon Transit: 3:37 AM
Moonset: 10:07 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.6%

Best Times for Fishing or Hunting

Major Periods

3:07 AM - 5:37 AM
11:26 AM - 1:56 PM

Minor Periods

9:32 PM - 11:02 PM
9:37 AM - 11:07 AM

Action Rating: 2 out of 5

Thursday, January 8, 2026

Weather Forecast

Sunny
38.7°F
18.1°F
27.2°F
53%
0 in
0%
0%
10.1 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.21 μg/m3
PM10: 2.8 μg/m3
Carbon Monoxide: 135.73 μg/m3
Nitrogen Dioxide: 3.25 μg/m3
Sulphur Dioxide: 1.48 μg/m3
Ozone: 81 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:05 AM
Sunset: 4:57 PM
Daylight: 9 hrs 43 mins
Moonrise: 11:04 PM
Moon Transit: 4:21 AM
Moonset: 10:31 AM
Moon Phase: Waning Gibbous
Moon Illumination: 68.7%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
12:08 AM - 2:38 PM

Minor Periods

12:00 AM - 12:00 AM
10:01 AM - 11:31 AM

Action Rating: 2 out of 5

Friday, January 9, 2026

Weather Forecast

Sunny
40.8°F
24.6°F
31.8°F
45%
0 in
0%
0%
10.3 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.55 μg/m3
PM10: 3.4 μg/m3
Carbon Monoxide: 143.81 μg/m3
Nitrogen Dioxide: 2.47 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 92.36 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:05 AM
Sunset: 4:58 PM
Daylight: 9 hrs 44 mins
Moonrise: 12:04 AM
Moon Transit: 5:03 AM
Moonset: 10:53 AM
Moon Phase: Waning Gibbous
Moon Illumination: 57.8%

Best Times for Fishing or Hunting

Major Periods

4:33 AM - 7:03 AM
12:50 AM - 3:20 PM

Minor Periods

10:23 AM - 11:53 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Saturday, January 10, 2026

Weather Forecast

Sunny
45.2°F
25.1°F
32.9°F
67%
0 in
0%
0%
10.3 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 2.51 μg/m3
PM10: 3.12 μg/m3
Carbon Monoxide: 142.3 μg/m3
Nitrogen Dioxide: 3.53 μg/m3
Sulphur Dioxide: 1.33 μg/m3
Ozone: 91.2 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:05 AM
Sunset: 4:59 PM
Daylight: 9 hrs 45 mins
Moonrise: 12:05 AM
Moon Transit: 5:44 AM
Moonset: 11:15 AM
Moon Phase: Last Quarter
Moon Illumination: 46.5%

Best Times for Fishing or Hunting

Major Periods

5:14 AM - 7:44 AM
1:31 PM - 4:01 PM

Minor Periods

10:45 AM - 12:15 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, January 11, 2026

Weather Forecast

Sunny
49.2°F
29.6°F
35°F
62%
0 in
0%
0%
10.1 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.78 μg/m3
PM10: 3.07 μg/m3
Carbon Monoxide: 164.13 μg/m3
Nitrogen Dioxide: 5.26 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 86.23 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:06 AM
Sunset: 5:00 PM
Daylight: 9 hrs 46 mins
Moonrise: 1:05 AM
Moon Transit: 6:26 AM
Moonset: 11:40 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

5:56 AM - 8:26 AM
2:14 PM - 4:44 PM

Minor Periods

11:10 AM - 12:40 AM
12:35 AM - 2:05 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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