Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

51.8°F

Measurement Time: Thursday, May 14, 2026, 5:30 PM 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

49.1°F
Clear
Clear
47.5°F
49.1°F
56%
ENE 4.3 mph
8.9 mph
47.5°F
34.1°F
0 in
2%
6 mi
1017 mbar
0

Five Day Weather Forecast

Sunny
Fri
H: 64°F
L: 47°F
Sunny
Sat
H: 59°F
L: 43°F
Sunny
Sun
H: 60°F
L: 44°F
Sunny
Mon
H: 63°F
L: 46°F
Sunny
Tue
H: 66°F
L: 44°F

Air Quality

AQI: 1 - Good
PM2.5: 5.25 μg/m3
PM10: 7.35 μg/m3
Carbon Monoxide: 127.85 μg/m3
Nitrogen Dioxide: 3.45 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 55 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:54 AM
Sunset: 8:01 PM
Daylight: 14 hrs 13 mins
Moonrise: 4:37 AM
Moon Transit: 11:48 AM
Moonset: 7:13 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

7:42 PM - 10:12 PM
11:18 AM - 1:48 PM

Minor Periods

6:43 PM - 8:13 PM
4:07 AM - 5:37 AM

Action Rating: 6 out of 5

Fire Weather Watch issued May 14 at 10:21AM PDT until May 18 at 8:00PM PDT by NWS Hanford CA

Effective: Thu May 14, 2026, 10:21 AM
Expires: Thu May 14, 2026, 6:30 PM

The National Weather Service in Hanford has issued a Fire Weather Watch, which is in effect from early Saturday morning through Monday evening. * AFFECTED AREA...Fire weather zone 579 West Side Hills. Fire weather zone 580 San Joaquin Valley. * WIND...GUSTING TO 35 MPH SATURDAY AND SUNDAY * HUMIDITY...20% OR LESS SATURDAY AND SUNDAY THEN 15% OR LESS MONDAY * HIGHEST THREAT...FAST-MOVING GRASS FIRES * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.


Fire Weather Watch issued May 14 at 6:09PM PDT until May 18 at 8:00PM PDT by NWS Hanford CA

Effective: Thu May 14, 2026, 6:09 PM
Expires: Fri May 15, 2026, 3:00 AM

* AFFECTED AREA...Fire weather zone 579 West Side Hills on the Coastal Range. Fire weather zone 580 San Joaquin Valley. * WIND...GUSTING TO 35 MPH SATURDAY AND SUNDAY * HUMIDITY...20% OR LESS SATURDAY AND SUNDAY THEN 15% OR LESS MONDAY * HIGHEST THREAT...FAST-MOVING GRASS FIRES * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.


Fire Weather Watch issued May 14 at 10:24AM PDT until May 18 at 8:00PM PDT by NWS Sacramento CA

Effective: Thu May 14, 2026, 10:24 AM
Expires: Fri May 15, 2026, 5:00 PM

The National Weather Service in Sacramento has issued a Fire Weather Watch for gusty winds and low humidity, which is in effect from late Friday night through Monday evening. * Winds...North winds 15 to 25 mph. Gusts 35 to 45 mph, locally up to 50 mph around the Delta. * Humidity...Daytime minimum humidities of 9 to 15%. * Highest Threat...Along the Interstate 5 corridor in the Sacramento Valley. Strongest winds are expected Sunday into Monday. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity. Outdoor burning is not recommended

A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
Friday, May 15, 2026

Weather Forecast

Sunny
63.6°F
47°F
54.5°F
42%
0 in
0%
0%
9.8 mph
10


Air Quality

AQI: 1 - Good
PM2.5: 6.47 μg/m3
PM10: 10.63 μg/m3
Carbon Monoxide: 127.65 μg/m3
Nitrogen Dioxide: 3.34 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 92.72 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:54 AM
Sunset: 8:01 PM
Daylight: 14 hrs 13 mins
Moonrise: 4:37 AM
Moon Transit: 11:48 AM
Moonset: 7:13 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

7:42 PM - 10:12 PM
11:18 AM - 1:48 PM

Minor Periods

6:43 PM - 8:13 PM
4:07 AM - 5:37 AM

Action Rating: 6 out of 5

Saturday, May 16, 2026

Weather Forecast

Sunny
58.5°F
42.7°F
50.2°F
45%
0 in
0%
0%
9.8 mph
8.8


Air Quality

AQI: 1 - Good
PM2.5: 5.11 μg/m3
PM10: 9.51 μg/m3
Carbon Monoxide: 128.73 μg/m3
Nitrogen Dioxide: 2.8 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 100.04 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:54 AM
Sunset: 8:02 PM
Daylight: 14 hrs 15 mins
Moonrise: 5:15 AM
Moon Transit: 12:48 AM
Moonset: 8:33 PM
Moon Phase: New
Moon Illumination: 2.0%

Best Times for Fishing or Hunting

Major Periods

8:43 PM - 11:13 PM
12:18 AM - 2:48 PM

Minor Periods

8:03 PM - 9:33 PM
4:45 AM - 6:15 AM

Action Rating: 5 out of 5

Sunday, May 17, 2026

Weather Forecast

Sunny
59.5°F
43.7°F
51.5°F
50%
0 in
0%
0%
9.4 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 4.82 μg/m3
PM10: 9.93 μg/m3
Carbon Monoxide: 131.25 μg/m3
Nitrogen Dioxide: 2.87 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 82.92 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:54 AM
Sunset: 8:03 PM
Daylight: 14 hrs 17 mins
Moonrise: 6:04 AM
Moon Transit: 1:53 PM
Moonset: 9:50 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:23 PM - 3:53 PM

Minor Periods

9:20 PM - 10:50 PM
5:34 AM - 7:04 AM

Action Rating: 4 out of 5

Monday, May 18, 2026

Weather Forecast

Sunny
63°F
45.5°F
53°F
47%
0 in
0%
0%
10.1 mph
9.9


Air Quality

AQI: 1 - Good
PM2.5: 2.82 μg/m3
PM10: 6.34 μg/m3
Carbon Monoxide: 121.11 μg/m3
Nitrogen Dioxide: 2.03 μg/m3
Sulphur Dioxide: 1.67 μg/m3
Ozone: 102.96 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:54 AM
Sunset: 8:04 PM
Daylight: 14 hrs 18 mins
Moonrise: 7:03 AM
Moon Transit: 3:00 PM
Moonset: 10:58 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:30 PM - 5:00 PM

Minor Periods

10:28 PM - 11:58 PM
6:33 AM - 8:03 AM

Action Rating: 3 out of 5

Tuesday, May 19, 2026

Weather Forecast

Sunny
66.2°F
44.2°F
52.2°F
46%
0 in
0%
0%
9.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.37 μg/m3
PM10: 7.17 μg/m3
Carbon Monoxide: 133.5 μg/m3
Nitrogen Dioxide: 4.28 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 74.38 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:54 AM
Sunset: 8:05 PM
Daylight: 14 hrs 20 mins
Moonrise: 8:13 AM
Moon Transit: 4:06 PM
Moonset: 11:54 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:36 PM - 6:06 PM

Minor Periods

12:00 AM - 12:00 AM
7:43 AM - 9:13 AM

Action Rating: 2 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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