Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

50.9°F

Measurement Time: Tuesday, September 22, 2026, 12:30 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

56°F
Sunny
Sunny
49%
E 5 mph
37°F

Weather Forecast

Sunny
Today
77°F - Sunny
Mostly Clear
Tonight
56°F - Mostly Clear
Sunny
Wednesday
82°F - Sunny
Mostly Clear
Wednesday Night
57°F - Mostly Clear
Sunny
Thursday
81°F - Sunny
Mostly Clear
Thursday Night
57°F - Mostly Clear
Sunny
Friday
76°F - Sunny
Mostly Clear
Friday Night
54°F - Mostly Clear
Sunny
Saturday
76°F - Sunny
Partly Cloudy
Saturday Night
52°F - Partly Cloudy
Sunny
Sunday
72°F - Sunny
Mostly Clear
Sunday Night
49°F - Mostly Clear
Sunny
Monday
74°F - Sunny
Clear
Monday Night
51°F - Clear

Astronomical

Sunrise: 6:46 AM
Sun Transit: 12:50 AM
Sunset: 6:55 PM
Daylight: 12 hrs 9 mins
Moonrise: 5:02 PM
Moon Transit: 10:14 PM
Moonset: 2:32 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

5:17 AM - 7:47 AM
12:00 AM - 12:00 AM

Minor Periods

4:32 PM - 6:02 PM
2:02 AM - 3:32 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: 6:46 AM
Sun Transit: 12:50 AM
Sunset: 6:55 PM
Daylight: 12 hrs 9 mins
Moonrise: 5:02 PM
Moon Transit: 10:14 PM
Moonset: 2:32 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

5:17 AM - 7:47 AM
12:00 AM - 12:00 AM

Minor Periods

4:32 PM - 6:02 PM
2:02 AM - 3:32 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: 6:46 AM
Sun Transit: 12:50 AM
Sunset: 6:55 PM
Daylight: 12 hrs 9 mins
Moonrise: 5:02 PM
Moon Transit: 10:14 PM
Moonset: 2:32 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

5:17 AM - 7:47 AM
12:00 AM - 12:00 AM

Minor Periods

4:32 PM - 6:02 PM
2:02 AM - 3:32 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: 6:47 AM
Sun Transit: 12:50 AM
Sunset: 6:53 PM
Daylight: 12 hrs 6 mins
Moonrise: 5:28 PM
Moon Transit: 11:00 PM
Moonset: 3:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

6:03 AM - 8:33 AM
12:00 AM - 12:00 AM

Minor Periods

4:58 PM - 6:28 PM
3:05 AM - 4:35 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: 6:47 AM
Sun Transit: 12:50 AM
Sunset: 6:53 PM
Daylight: 12 hrs 6 mins
Moonrise: 5:28 PM
Moon Transit: 11:00 PM
Moonset: 3:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

6:03 AM - 8:33 AM
12:00 AM - 12:00 AM

Minor Periods

4:58 PM - 6:28 PM
3:05 AM - 4:35 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: 6:48 AM
Sun Transit: 12:50 AM
Sunset: 6:52 PM
Daylight: 12 hrs 4 mins
Moonrise: 5:53 PM
Moon Transit: 11:43 PM
Moonset: 4:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

6:47 AM - 9:17 AM
12:00 AM - 12:00 AM

Minor Periods

5:23 PM - 6:53 PM
4:09 AM - 5:39 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: 6:48 AM
Sun Transit: 12:50 AM
Sunset: 6:52 PM
Daylight: 12 hrs 4 mins
Moonrise: 5:53 PM
Moon Transit: 11:43 PM
Moonset: 4:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

6:47 AM - 9:17 AM
12:00 AM - 12:00 AM

Minor Periods

5:23 PM - 6:53 PM
4:09 AM - 5:39 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: 6:49 AM
Sun Transit: 12:49 AM
Sunset: 6:50 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:17 PM
Moon Transit: 12:00 AM
Moonset: 5:43 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

5:47 PM - 7:17 PM
5:13 AM - 6:43 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: 6:49 AM
Sun Transit: 12:49 AM
Sunset: 6:50 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:17 PM
Moon Transit: 12:00 AM
Moonset: 5:43 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

5:47 PM - 7:17 PM
5:13 AM - 6:43 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: 6:50 AM
Sun Transit: 12:49 AM
Sunset: 6:49 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:42 PM
Moon Transit: 5:33 AM
Moonset: 6:49 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

5:03 AM - 7:33 AM
5:03 AM - 7:33 AM

Minor Periods

6:12 PM - 7:42 PM
6:19 AM - 7:49 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: 6:50 AM
Sun Transit: 12:49 AM
Sunset: 6:49 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:42 PM
Moon Transit: 5:33 AM
Moonset: 6:49 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

5:03 AM - 7:33 AM
5:03 AM - 7:33 AM

Minor Periods

6:12 PM - 7:42 PM
6:19 AM - 7:49 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: 6:51 AM
Sun Transit: 12:49 AM
Sunset: 6:47 PM
Daylight: 11 hrs 57 mins
Moonrise: 7:09 PM
Moon Transit: 1:13 AM
Moonset: 7:57 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:43 AM - 3:13 AM
9:03 AM - 11:33 AM

Minor Periods

6:39 PM - 8:09 PM
7:27 AM - 8:57 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: 6:51 AM
Sun Transit: 12:49 AM
Sunset: 6:47 PM
Daylight: 11 hrs 57 mins
Moonrise: 7:09 PM
Moon Transit: 1:13 AM
Moonset: 7:57 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:43 AM - 3:13 AM
9:03 AM - 11:33 AM

Minor Periods

6:39 PM - 8:09 PM
7:27 AM - 8:57 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: 6:52 AM
Sun Transit: 12:48 AM
Sunset: 6:46 PM
Daylight: 11 hrs 54 mins
Moonrise: 7:40 PM
Moon Transit: 2:02 AM
Moonset: 9:07 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

1:32 AM - 4:02 AM
9:52 AM - 12:22 AM

Minor Periods

7:10 PM - 8:40 PM
8:37 AM - 10:07 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: 6:52 AM
Sun Transit: 12:48 AM
Sunset: 6:46 PM
Daylight: 11 hrs 54 mins
Moonrise: 7:40 PM
Moon Transit: 2:02 AM
Moonset: 9:07 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

1:32 AM - 4:02 AM
9:52 AM - 12:22 AM

Minor Periods

7:10 PM - 8:40 PM
8:37 AM - 10:07 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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