Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

57.0°F

Measurement Time: Wednesday, September 9, 2026, 2:30 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

73°F
Mostly Clear
Mostly Clear
41%
E 5 mph
48°F

Weather Forecast

Mostly Clear
Tonight
65°F - Mostly Clear
Sunny
Thursday
89°F - Sunny
Partly Cloudy
Thursday Night
63°F - Partly Cloudy
Sunny
Friday
85°F - Sunny
Mostly Clear
Friday Night
60°F - Mostly Clear
Sunny
Saturday
79°F - Sunny
Mostly Clear
Saturday Night
55°F - Mostly Clear
Sunny
Sunday
77°F - Sunny
Mostly Clear
Sunday Night
54°F - Mostly Clear
Sunny
Monday
79°F - Sunny
Mostly Clear
Monday Night
53°F - Mostly Clear
Sunny
Tuesday
78°F - Sunny
Mostly Clear
Tuesday Night
52°F - Mostly Clear
Sunny
Wednesday
76°F - Sunny

Astronomical

Sunrise: 6:36 AM
Sun Transit: 12:55 AM
Sunset: 7:15 PM
Daylight: 12 hrs 39 mins
Moonrise: 4:54 AM
Moon Transit: 11:49 AM
Moonset: 6:34 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

7:39 PM - 10:09 PM
11:19 AM - 1:49 PM

Minor Periods

6:04 PM - 7:34 PM
4:24 AM - 5:54 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:36 AM
Sun Transit: 12:55 AM
Sunset: 7:15 PM
Daylight: 12 hrs 39 mins
Moonrise: 4:54 AM
Moon Transit: 11:49 AM
Moonset: 6:34 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

7:39 PM - 10:09 PM
11:19 AM - 1:49 PM

Minor Periods

6:04 PM - 7:34 PM
4:24 AM - 5:54 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:36 AM
Sun Transit: 12:55 AM
Sunset: 7:13 PM
Daylight: 12 hrs 37 mins
Moonrise: 6:05 AM
Moon Transit: 12:37 AM
Moonset: 7:00 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

8:26 PM - 10:56 PM
12:07 AM - 2:37 PM

Minor Periods

6:30 PM - 8:00 PM
5:35 AM - 7:05 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:36 AM
Sun Transit: 12:55 AM
Sunset: 7:13 PM
Daylight: 12 hrs 37 mins
Moonrise: 6:05 AM
Moon Transit: 12:37 AM
Moonset: 7:00 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

8:26 PM - 10:56 PM
12:07 AM - 2:37 PM

Minor Periods

6:30 PM - 8:00 PM
5:35 AM - 7:05 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:37 AM
Sun Transit: 12:54 AM
Sunset: 7:12 PM
Daylight: 12 hrs 35 mins
Moonrise: 7:12 AM
Moon Transit: 1:23 PM
Moonset: 7:24 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

9:12 PM - 11:42 PM
12:53 AM - 3:23 PM

Minor Periods

6:54 PM - 8:24 PM
6:42 AM - 8:12 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:37 AM
Sun Transit: 12:54 AM
Sunset: 7:12 PM
Daylight: 12 hrs 35 mins
Moonrise: 7:12 AM
Moon Transit: 1:23 PM
Moonset: 7:24 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

9:12 PM - 11:42 PM
12:53 AM - 3:23 PM

Minor Periods

6:54 PM - 8:24 PM
6:42 AM - 8:12 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:38 AM
Sun Transit: 12:54 AM
Sunset: 7:10 PM
Daylight: 12 hrs 32 mins
Moonrise: 8:19 AM
Moon Transit: 2:08 PM
Moonset: 7:49 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:38 PM - 4:08 PM

Minor Periods

7:19 PM - 8:49 PM
7:49 AM - 9:19 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:38 AM
Sun Transit: 12:54 AM
Sunset: 7:10 PM
Daylight: 12 hrs 32 mins
Moonrise: 8:19 AM
Moon Transit: 2:08 PM
Moonset: 7:49 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:38 PM - 4:08 PM

Minor Periods

7:19 PM - 8:49 PM
7:49 AM - 9:19 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:39 AM
Sun Transit: 12:54 AM
Sunset: 7:09 PM
Daylight: 12 hrs 30 mins
Moonrise: 9:24 AM
Moon Transit: 2:53 PM
Moonset: 8:15 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:23 PM - 4:53 PM

Minor Periods

7:45 PM - 9:15 PM
8:54 AM - 10:24 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:39 AM
Sun Transit: 12:54 AM
Sunset: 7:09 PM
Daylight: 12 hrs 30 mins
Moonrise: 9:24 AM
Moon Transit: 2:53 PM
Moonset: 8:15 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:23 PM - 4:53 PM

Minor Periods

7:45 PM - 9:15 PM
8:54 AM - 10:24 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:40 AM
Sun Transit: 12:53 AM
Sunset: 7:07 PM
Daylight: 12 hrs 28 mins
Moonrise: 10:29 AM
Moon Transit: 3:39 PM
Moonset: 8:44 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:09 PM - 5:39 PM

Minor Periods

8:14 PM - 9:44 PM
9:59 AM - 11:29 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:40 AM
Sun Transit: 12:53 AM
Sunset: 7:07 PM
Daylight: 12 hrs 28 mins
Moonrise: 10:29 AM
Moon Transit: 3:39 PM
Moonset: 8:44 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:09 PM - 5:39 PM

Minor Periods

8:14 PM - 9:44 PM
9:59 AM - 11:29 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:41 AM
Sun Transit: 12:53 AM
Sunset: 7:06 PM
Daylight: 12 hrs 25 mins
Moonrise: 11:33 AM
Moon Transit: 4:27 PM
Moonset: 9:17 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:57 PM - 6:27 PM

Minor Periods

8:47 PM - 10:17 PM
11:03 AM - 12:33 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:41 AM
Sun Transit: 12:53 AM
Sunset: 7:06 PM
Daylight: 12 hrs 25 mins
Moonrise: 11:33 AM
Moon Transit: 4:27 PM
Moonset: 9:17 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:57 PM - 6:27 PM

Minor Periods

8:47 PM - 10:17 PM
11:03 AM - 12:33 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 6:41 AM
Sun Transit: 12:52 AM
Sunset: 7:04 PM
Daylight: 12 hrs 23 mins
Moonrise: 12:36 AM
Moon Transit: 5:17 PM
Moonset: 9:55 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.0%

Best Times for Fishing or Hunting

Major Periods

12:17 AM - 2:47 AM
4:47 PM - 7:17 PM

Minor Periods

9:25 PM - 10:55 PM
12:06 AM - 1:36 PM

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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