Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

36.3°F

Measurement Time: Monday, January 12, 2026, 8:30 PM 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

7°F
Clear
Clear
-8.2°F
41.6°F
78%
ENE 11.2 mph
23.5 mph
34.6°F
2°F
0 in
0%
9 mi
1035 mbar
0

Five Day Weather Forecast

Sunny
Tue
H: 57°F
L: 37°F
Sunny
Wed
H: 59°F
L: 46°F
Sunny
Thu
H: 57°F
L: 39°F
Sunny
Fri
H: 56°F
L: 39°F
Sunny
Sat
H: 56°F
L: 41°F

Air Quality

AQI: 1 - Good
PM2.5: 2.45 μg/m3
PM10: 2.75 μg/m3
Carbon Monoxide: 110.85 μg/m3
Nitrogen Dioxide: 2.25 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:07 AM
Sunset: 5:02 PM
Daylight: 9 hrs 49 mins
Moonrise: 3:06 AM
Moon Transit: 7:56 AM
Moonset: 12:41 AM
Moon Phase: Waning Crescent
Moon Illumination: 15.9%

Best Times for Fishing or Hunting

Major Periods

7:26 AM - 9:56 AM
3:45 PM - 6:15 PM

Minor Periods

12:11 AM - 1:41 PM
2:36 AM - 4:06 AM

Action Rating: 3 out of 5

Dense Fog Advisory issued January 12 at 8:02PM PST until January 13 at 10:00AM PST by NWS Hanford CA

Effective: Mon January 12, 2026, 8:02 PM
Expires: Tue January 13, 2026, 5:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Caruthers - San Joaquin - Selma, Delano-Wasco-Shafter, Fresno-Clovis, Hanford - Corcoran - Lemoore, Los Banos - Dos Palos, Merced - Madera - Mendota, Planada - Le Grand - Snelling, Southeast San Joaquin Valley, Visalia - Porterville - Reedley, and West Side of Fresno and Kings Counties. * WHEN...From 3 AM to 10 AM PST Tuesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Tuesday, January 13, 2026

Weather Forecast

Sunny
56.7°F
37.2°F
46.9°F
36%
0 in
0%
0%
11.6 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 4.18 μg/m3
PM10: 4.57 μg/m3
Carbon Monoxide: 111.89 μg/m3
Nitrogen Dioxide: 2.82 μg/m3
Sulphur Dioxide: 1.07 μg/m3
Ozone: 81.36 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:07 AM
Sunset: 5:02 PM
Daylight: 9 hrs 49 mins
Moonrise: 3:06 AM
Moon Transit: 7:56 AM
Moonset: 12:41 AM
Moon Phase: Waning Crescent
Moon Illumination: 15.9%

Best Times for Fishing or Hunting

Major Periods

7:26 AM - 9:56 AM
3:45 PM - 6:15 PM

Minor Periods

12:11 AM - 1:41 PM
2:36 AM - 4:06 AM

Action Rating: 3 out of 5

Wednesday, January 14, 2026

Weather Forecast

Sunny
58.6°F
45.9°F
50.2°F
32%
0 in
0%
0%
11.6 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 2.27 μg/m3
PM10: 2.55 μg/m3
Carbon Monoxide: 113.73 μg/m3
Nitrogen Dioxide: 3.31 μg/m3
Sulphur Dioxide: 1.08 μg/m3
Ozone: 74.36 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:07 AM
Sunset: 5:03 PM
Daylight: 9 hrs 50 mins
Moonrise: 4:07 AM
Moon Transit: 8:45 AM
Moonset: 1:20 PM
Moon Phase: Waning Crescent
Moon Illumination: 8.5%

Best Times for Fishing or Hunting

Major Periods

8:15 AM - 10:45 AM
4:35 PM - 7:05 PM

Minor Periods

12:50 AM - 2:20 PM
3:37 AM - 5:07 AM

Action Rating: 3 out of 5

Thursday, January 15, 2026

Weather Forecast

Sunny
56.7°F
39.4°F
46.2°F
38%
0 in
0%
0%
10.7 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 1.82 μg/m3
PM10: 2.02 μg/m3
Carbon Monoxide: 110.53 μg/m3
Nitrogen Dioxide: 3.29 μg/m3
Sulphur Dioxide: 1.11 μg/m3
Ozone: 74.4 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:07 AM
Sunset: 5:04 PM
Daylight: 9 hrs 51 mins
Moonrise: 5:05 AM
Moon Transit: 9:36 AM
Moonset: 2:07 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

5:27 PM - 7:57 PM
9:06 AM - 11:36 AM

Minor Periods

1:37 PM - 3:07 PM
4:35 AM - 6:05 AM

Action Rating: 3 out of 5

Friday, January 16, 2026

Weather Forecast

Sunny
55.5°F
38.7°F
44.8°F
33%
0 in
0%
0%
10.5 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 1.72 μg/m3
PM10: 1.85 μg/m3
Carbon Monoxide: 109.79 μg/m3
Nitrogen Dioxide: 3.21 μg/m3
Sulphur Dioxide: 1.12 μg/m3
Ozone: 76.88 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:08 AM
Sunset: 5:05 PM
Daylight: 9 hrs 53 mins
Moonrise: 5:58 AM
Moon Transit: 10:28 AM
Moonset: 3:01 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

6:19 PM - 8:49 PM
9:58 AM - 12:28 AM

Minor Periods

2:31 PM - 4:01 PM
5:28 AM - 6:58 AM

Action Rating: 3 out of 5

Saturday, January 17, 2026

Weather Forecast

Sunny
56.2°F
40.7°F
45.2°F
29%
0 in
0%
0%
8.5 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.01 μg/m3
PM10: 2.33 μg/m3
Carbon Monoxide: 134.22 μg/m3
Nitrogen Dioxide: 4.6 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 67.46 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:08 AM
Sunset: 5:06 PM
Daylight: 9 hrs 54 mins
Moonrise: 6:45 AM
Moon Transit: 11:21 AM
Moonset: 4:01 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

7:12 PM - 9:42 PM
10:51 AM - 1:21 PM

Minor Periods

3:31 PM - 5:01 PM
6:15 AM - 7:45 AM

Action Rating: 4 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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