Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

37.2°F

Measurement Time: Friday, January 30, 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

25.2°F
Overcast
Overcast
22.9°F
47.7°F
80%
E 2.2 mph
6.7 mph
47.3°F
24.9°F
0 in
0%
9 mi
1034 mbar
2.4

Five Day Weather Forecast

Overcast
Fri
H: 53°F
L: 43°F
Partly Cloudy
Sat
H: 55°F
L: 39°F
Sunny
Sun
H: 51°F
L: 41°F
Sunny
Mon
H: 51°F
L: 40°F
Sunny
Tue
H: 55°F
L: 40°F

Air Quality

AQI: 1 - Good
PM2.5: 6.35 μg/m3
PM10: 8.95 μg/m3
Carbon Monoxide: 134.85 μg/m3
Nitrogen Dioxide: 5.25 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 89 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

Dense Fog Advisory issued January 29 at 8:39PM PST until January 30 at 12:00PM PST by NWS Hanford CA

Effective: Thu January 29, 2026, 8:39 PM
Expires: Fri January 30, 2026, 5:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. Worst case scenario, visibilities down to zero. * WHERE...A portion of central California. * WHEN...Until noon 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, 180 and 198.

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


Dense Fog Advisory issued January 30 at 3:51AM PST until January 30 at 12:00PM PST by NWS Hanford CA

Effective: Fri January 30, 2026, 3:51 AM
Expires: Fri January 30, 2026, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...A portion of central California. * WHEN...Until noon PST today. * 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, 180 and 198.

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


Dense Fog Advisory issued January 29 at 12:41PM PST until January 30 at 12:00PM PST by NWS Sacramento CA

Effective: Thu January 29, 2026, 12:41 PM
Expires: Fri January 30, 2026, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carquinez Strait and Delta, Central/Southern Sacramento Valley, and Northern San Joaquin Valley. * WHEN...From midnight tonight to noon PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Friday, January 30, 2026

Weather Forecast

Overcast
53.4°F
43°F
47.4°F
40%
0 in
0%
0%
8.3 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 4.99 μg/m3
PM10: 7.19 μg/m3
Carbon Monoxide: 131.65 μg/m3
Nitrogen Dioxide: 3.64 μg/m3
Sulphur Dioxide: 1.58 μg/m3
Ozone: 82.88 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

Saturday, January 31, 2026

Weather Forecast

Partly Cloudy
54.5°F
39.2°F
48.1°F
29%
0 in
0%
0%
7.6 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 8.78 μg/m3
PM10: 12.5 μg/m3
Carbon Monoxide: 121.53 μg/m3
Nitrogen Dioxide: 3.29 μg/m3
Sulphur Dioxide: 1.56 μg/m3
Ozone: 90.6 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:11 AM
Sunset: 5:21 PM
Daylight: 10 hrs 18 mins
Moonrise: 4:08 PM
Moon Transit: 11:42 PM
Moonset: 6:26 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

6:37 AM - 9:07 AM
12:00 AM - 12:00 AM

Minor Periods

3:38 PM - 5:08 PM
5:56 AM - 7:26 AM

Action Rating: 5 out of 5

Sunday, February 1, 2026

Weather Forecast

Sunny
51.4°F
41.4°F
44.8°F
41%
0 in
0%
0%
7.2 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 9.38 μg/m3
PM10: 12.73 μg/m3
Carbon Monoxide: 122.85 μg/m3
Nitrogen Dioxide: 2.93 μg/m3
Sulphur Dioxide: 1.56 μg/m3
Ozone: 99.44 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:11 AM
Sunset: 5:22 PM
Daylight: 10 hrs 20 mins
Moonrise: 5:22 PM
Moon Transit: 12:00 AM
Moonset: 7:06 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:34 AM - 10:04 AM

Minor Periods

4:52 PM - 6:22 PM
6:36 AM - 8:06 AM

Action Rating: 5 out of 5

Monday, February 2, 2026

Weather Forecast

Sunny
50.9°F
40.1°F
43.7°F
31%
0 in
0%
0%
7.4 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 6.65 μg/m3
PM10: 8.16 μg/m3
Carbon Monoxide: 132.81 μg/m3
Nitrogen Dioxide: 3.56 μg/m3
Sulphur Dioxide: 1.79 μg/m3
Ozone: 87.72 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:11 AM
Sunset: 5:23 PM
Daylight: 10 hrs 22 mins
Moonrise: 6:35 PM
Moon Transit: 12:36 AM
Moonset: 7:39 AM
Moon Phase: Full
Moon Illumination: 99.4%

Best Times for Fishing or Hunting

Major Periods

12:06 AM - 2:36 AM
8:27 AM - 10:57 AM

Minor Periods

6:05 PM - 7:35 PM
7:09 AM - 8:39 AM

Action Rating: 4 out of 5

Tuesday, February 3, 2026

Weather Forecast

Sunny
55.1°F
39.8°F
45.4°F
36%
0 in
0%
0%
7.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 5.88 μg/m3
PM10: 6.86 μg/m3
Carbon Monoxide: 161.22 μg/m3
Nitrogen Dioxide: 5.58 μg/m3
Sulphur Dioxide: 1.81 μg/m3
Ozone: 69.69 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:12 AM
Sunset: 5:24 PM
Daylight: 10 hrs 24 mins
Moonrise: 7:42 PM
Moon Transit: 1:26 AM
Moonset: 8:06 AM
Moon Phase: Full
Moon Illumination: 96.3%

Best Times for Fishing or Hunting

Major Periods

12:56 AM - 3:26 AM
9:15 AM - 11:45 AM

Minor Periods

7:12 PM - 8:42 PM
7:36 AM - 9:06 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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