Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

48.9°F

Measurement Time: Tuesday, May 26, 2026, 2:30 AM PDT

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

37.9°F
Moderate or heavy snow showers
Moderate or heavy snow showers
32.2°F
37.9°F
97%
SW 7.2 mph
10.3 mph
32.2°F
36.7°F
0.01 in
100%
4 mi
1008 mbar
3.1

Five Day Weather Forecast

Moderate rain
Tue
H: 39°F
L: 30°F
Moderate or heavy snow showers
Wed
H: 40°F
L: 28°F
Moderate rain
Thu
H: 39°F
L: 32°F
Patchy rain nearby
Fri
H: 45°F
L: 33°F
Patchy rain nearby
Sat
H: 55°F
L: 37°F

Air Quality

AQI: 1 - Good
PM2.5: 4.95 μg/m3
PM10: 10.75 μg/m3
Carbon Monoxide: 114.85 μg/m3
Nitrogen Dioxide: 1.35 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 88 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:55 AM
Sunset: 8:10 PM
Daylight: 14 hrs 30 mins
Moonrise: 4:08 PM
Moon Transit: 9:46 PM
Moonset: 2:53 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

4:52 AM - 7:22 AM
9:16 PM - 11:46 PM

Minor Periods

3:38 PM - 5:08 PM
2:23 AM - 3:53 AM

Action Rating: 2 out of 5

Lake Wind Advisory issued May 25 at 11:15PM PDT until May 26 at 5:00PM PDT by NWS Reno NV

Effective: Mon May 25, 2026, 11:15 PM
Expires: Tue May 26, 2026, 5:00 PM

* WHAT...Southwest winds 15 to 25 mph with gusts up to 40 mph for Topaz Lake, Bridgeport Reservoir, Mono Lake, and Crowley Lake. * WHERE...Mono County. * WHEN...From 8 AM to 5 PM PDT Tuesday. * IMPACTS...Small boats, kayaks and paddle boards will be prone to capsizing and should remain off lake waters until conditions improve.

Check lake conditions before heading out and be prepared for a sudden increase in winds and wave heights. Consider postponing boating activities on the lake until a day with less wind.
Tuesday, May 26, 2026

Weather Forecast

Moderate rain
39.2°F
30.4°F
37.9°F
87%
0.3 in
85%
9%
9.4 mph
7.6


Air Quality

AQI: 1 - Good
PM2.5: 8.13 μg/m3
PM10: 21.06 μg/m3
Carbon Monoxide: 119.97 μg/m3
Nitrogen Dioxide: 3.01 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 94.84 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:55 AM
Sunset: 8:10 PM
Daylight: 14 hrs 30 mins
Moonrise: 4:08 PM
Moon Transit: 9:46 PM
Moonset: 2:53 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

4:52 AM - 7:22 AM
9:16 PM - 11:46 PM

Minor Periods

3:38 PM - 5:08 PM
2:23 AM - 3:53 AM

Action Rating: 2 out of 5

Wednesday, May 27, 2026

Weather Forecast

Moderate or heavy snow showers
39.8°F
27.5°F
33.1°F
86%
0.29 in
89%
19%
6 mph
4.5


Air Quality

AQI: 1 - Good
PM2.5: 4.15 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 114.65 μg/m3
Nitrogen Dioxide: 2.87 μg/m3
Sulphur Dioxide: 1.11 μg/m3
Ozone: 75.68 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:55 AM
Sunset: 8:11 PM
Daylight: 14 hrs 31 mins
Moonrise: 5:09 PM
Moon Transit: 10:29 PM
Moonset: 3:17 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.7%

Best Times for Fishing or Hunting

Major Periods

5:34 AM - 8:04 AM
12:00 AM - 12:00 AM

Minor Periods

4:39 PM - 6:09 PM
2:47 AM - 4:17 AM

Action Rating: 3 out of 5

Thursday, May 28, 2026

Weather Forecast

Moderate rain
39.4°F
32.2°F
35.2°F
90%
0.49 in
80%
17%
4.9 mph
7.3


Air Quality

AQI: 1 - Good
PM2.5: 2.79 μg/m3
PM10: 4.51 μg/m3
Carbon Monoxide: 111.77 μg/m3
Nitrogen Dioxide: 3.03 μg/m3
Sulphur Dioxide: 1.01 μg/m3
Ozone: 71.48 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:55 AM
Sunset: 8:12 PM
Daylight: 14 hrs 32 mins
Moonrise: 6:11 PM
Moon Transit: 11:14 PM
Moonset: 3:42 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.7%

Best Times for Fishing or Hunting

Major Periods

6:17 AM - 8:47 AM
12:00 AM - 12:00 AM

Minor Periods

5:41 PM - 7:11 PM
3:12 AM - 4:42 AM

Action Rating: 2 out of 5

Friday, May 29, 2026

Weather Forecast

Patchy rain nearby
44.6°F
33°F
38.6°F
88%
0.05 in
89%
15%
6 mph
9.1


Air Quality

AQI: 1 - Good
PM2.5: 3.42 μg/m3
PM10: 5.41 μg/m3
Carbon Monoxide: 114.15 μg/m3
Nitrogen Dioxide: 2.97 μg/m3
Sulphur Dioxide: 0.96 μg/m3
Ozone: 85.44 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:55 AM
Sunset: 8:13 PM
Daylight: 14 hrs 34 mins
Moonrise: 7:12 PM
Moon Transit: 12:00 AM
Moonset: 4:12 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:03 AM - 9:33 AM

Minor Periods

6:42 PM - 8:12 PM
3:42 AM - 5:12 AM

Action Rating: 4 out of 5

Saturday, May 30, 2026

Weather Forecast

Patchy rain nearby
54.9°F
37.3°F
46°F
67%
0.01 in
88%
0%
9.2 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 5.34 μg/m3
PM10: 8.93 μg/m3
Carbon Monoxide: 124.85 μg/m3
Nitrogen Dioxide: 4.85 μg/m3
Sulphur Dioxide: 0.95 μg/m3
Ozone: 64.69 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:55 AM
Sunset: 8:13 PM
Daylight: 14 hrs 35 mins
Moonrise: 8:13 PM
Moon Transit: 12:01 AM
Moonset: 4:46 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

7:43 PM - 9:13 PM
4:16 AM - 5:46 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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