Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

36.9°F

Measurement Time: Thursday, January 15, 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

23.2°F
Clear
Clear
13°F
42.1°F
49%
ENE 9.6 mph
20.2 mph
35.7°F
-1.8°F
0 in
0%
9 mi
1028 mbar
0

Five Day Weather Forecast

Sunny
Fri
H: 58°F
L: 38°F
Sunny
Sat
H: 55°F
L: 39°F
Partly Cloudy
Sun
H: 54°F
L: 41°F
Sunny
Mon
H: 55°F
L: 42°F
Partly Cloudy
Tue
H: 51°F
L: 41°F

Air Quality

PM2.5: 1.25 μg/m3
PM10: 1.35 μg/m3
Carbon Monoxide: 115.85 μg/m3
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 75 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

Dense Fog Advisory issued January 15 at 2:10PM PST until January 16 at 11:00AM PST by NWS Hanford CA

Effective: Thu January 15, 2026, 2:10 PM
Expires: Thu January 15, 2026, 11:00 PM

* WHAT...Visibility one quarter mile to as low as 200 feet in dense fog. * WHERE...A portion of central California. * WHEN...From 11 PM this evening to 11 AM PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Highways include, but are not limited to, Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 168, 180, and 198.

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


Dense Fog Advisory issued January 15 at 10:50PM PST until January 16 at 11:00AM PST by NWS Hanford CA

Effective: Thu January 15, 2026, 10:50 PM
Expires: Fri January 16, 2026, 7:00 AM

* WHAT...Visibility one quarter mile to as low as 200 feet in dense fog. * WHERE...A portion of central California. * WHEN...Until 11 AM PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Highways include, but are not limited to, Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 168, 180, and 198.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Friday, January 16, 2026

Weather Forecast

Sunny
57.7°F
38.3°F
46.5°F
32%
0 in
0%
0%
9.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 1.92 μg/m3
PM10: 2.03 μg/m3
Carbon Monoxide: 111.21 μg/m3
Nitrogen Dioxide: 3.53 μg/m3
Sulphur Dioxide: 1.16 μg/m3
Ozone: 73.64 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
55.2°F
39°F
45.2°F
37%
0 in
0%
0%
9.2 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 1.91 μg/m3
PM10: 2.07 μg/m3
Carbon Monoxide: 111.39 μg/m3
Nitrogen Dioxide: 3.87 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 68.12 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

Sunday, January 18, 2026

Weather Forecast

Partly Cloudy
53.8°F
41.3°F
46.4°F
30%
0 in
0%
0%
6.5 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 2.5 μg/m3
PM10: 2.61 μg/m3
Carbon Monoxide: 141.16 μg/m3
Nitrogen Dioxide: 5.06 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 67 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:08 AM
Sunset: 5:07 PM
Daylight: 9 hrs 56 mins
Moonrise: 7:25 AM
Moon Transit: 12:12 AM
Moonset: 5:05 PM
Moon Phase: New
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

8:02 PM - 10:32 PM
11:42 AM - 2:12 PM

Minor Periods

4:35 PM - 6:05 PM
6:55 AM - 8:25 AM

Action Rating: 4 out of 5

Monday, January 19, 2026

Weather Forecast

Sunny
54.5°F
41.8°F
45°F
30%
0 in
0%
0%
7.6 mph
0


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:09 AM
Sunset: 5:08 PM
Daylight: 9 hrs 57 mins
Moonrise: 8:00 AM
Moon Transit: 1:01 PM
Moonset: 6:11 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

8:51 PM - 11:21 PM
12:31 AM - 3:01 PM

Minor Periods

5:41 PM - 7:11 PM
7:30 AM - 9:00 AM

Action Rating: 4 out of 5

Tuesday, January 20, 2026

Weather Forecast

Partly Cloudy
51.1°F
40.9°F
44.4°F
37%
0 in
0%
0%
6.9 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:10 AM
Sun Transit: 12:09 AM
Sunset: 5:09 PM
Daylight: 9 hrs 59 mins
Moonrise: 8:29 AM
Moon Transit: 1:48 PM
Moonset: 7:16 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:18 PM - 3:48 PM

Minor Periods

6:46 PM - 8:16 PM
7:59 AM - 9:29 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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