Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

62.2°F

Measurement Time: Sunday, July 19, 2026, 10:30 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

61.2°F
Clear
Clear
51.1°F
61.2°F
46%
ENE 5.1 mph
10.8 mph
61.2°F
40.3°F
0 in
10%
6 mi
1016 mbar
0

Five Day Weather Forecast

Sunny
Mon
H: 77°F
L: 61°F
Sunny
Tue
H: 77°F
L: 60°F
Sunny
Wed
H: 80°F
L: 60°F
Sunny
Thu
H: 82°F
L: 61°F
Sunny
Fri
H: 82°F
L: 62°F

Air Quality

AQI: 1 - Good
PM2.5: 4.7 μg/m3
PM10: 6.6 μg/m3
Carbon Monoxide: 93 μg/m3
Nitrogen Dioxide: 6 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 61 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:04 PM
Sunset: 8:17 PM
Daylight: 14 hrs 25 mins
Moonrise: 12:53 AM
Moon Transit: 6:24 PM
Moonset: 12:23 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

1:28 AM - 3:58 AM
5:54 PM - 8:24 PM

Minor Periods

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

Action Rating: 3 out of 5

Flood Watch issued July 20 at 3:27AM PDT until July 20 at 11:00PM PDT by NWS Reno NV

Effective: Mon July 20, 2026, 3:27 AM
Expires: Mon July 20, 2026, 11:00 PM

* WHAT...Flash flooding caused by excessive rainfall is possible due to thunderstorms. * WHERE...Portions of east central California, including the following area, Mono County and western Nevada, including the following area, Mineral and Southern Lyon Counties. * WHEN...From 2 PM PDT this afternoon through this evening. * IMPACTS...Excessive runoff may result in flooding of creeks, streams, urban areas, burn scars, and areas near steep terrain. * ADDITIONAL DETAILS... - Deeper monsoonal moisture combined with daytime heating will produce scattered thunderstorms Monday afternoon and evening. Slower moving storms could redevelop over similar areas, increasing the risk for heavy rainfall capable of producing flash flooding. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Monday, July 20, 2026

Weather Forecast

Sunny
77°F
61.2°F
67.5°F
36%
0 in
17%
0%
10.3 mph
11.2


Air Quality

AQI: 1 - Good
PM2.5: 5.14 μg/m3
PM10: 7.25 μg/m3
Carbon Monoxide: 95.17 μg/m3
Nitrogen Dioxide: 2.82 μg/m3
Sulphur Dioxide: 0.85 μg/m3
Ozone: 92.71 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:04 PM
Sunset: 8:17 PM
Daylight: 14 hrs 25 mins
Moonrise: 12:53 AM
Moon Transit: 6:24 PM
Moonset: 12:23 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

1:28 AM - 3:58 AM
5:54 PM - 8:24 PM

Minor Periods

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

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Sunny
77.2°F
60.1°F
67.6°F
35%
0 in
3%
0%
9.6 mph
9.3


Air Quality

AQI: 1 - Good
PM2.5: 3.99 μg/m3
PM10: 5.08 μg/m3
Carbon Monoxide: 92.83 μg/m3
Nitrogen Dioxide: 3.46 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 68.67 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:04 PM
Sunset: 8:16 PM
Daylight: 14 hrs 23 mins
Moonrise: 1:55 PM
Moon Transit: 7:08 PM
Moonset: 12:48 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

2:12 AM - 4:42 AM
6:38 PM - 9:08 PM

Minor Periods

1:25 PM - 2:55 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, July 22, 2026

Weather Forecast

Sunny
80°F
59.9°F
69°F
35%
0 in
1%
0%
11 mph
11.5


Air Quality

AQI: 1 - Good
PM2.5: 3.23 μg/m3
PM10: 3.8 μg/m3
Carbon Monoxide: 91.5 μg/m3
Nitrogen Dioxide: 3.27 μg/m3
Sulphur Dioxide: 0.43 μg/m3
Ozone: 64.17 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:04 PM
Sunset: 8:15 PM
Daylight: 14 hrs 22 mins
Moonrise: 2:57 PM
Moon Transit: 7:54 PM
Moonset: 12:15 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

2:57 AM - 5:27 AM
7:24 PM - 9:54 PM

Minor Periods

2:27 PM - 3:57 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
82°F
60.7°F
70.5°F
33%
0 in
1%
0%
13 mph
12.5


Air Quality

AQI: 1 - Good
PM2.5: 3.67 μg/m3
PM10: 4.11 μg/m3
Carbon Monoxide: 98.03 μg/m3
Nitrogen Dioxide: 3.11 μg/m3
Sulphur Dioxide: 0.65 μg/m3
Ozone: 70.88 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:04 PM
Sunset: 8:15 PM
Daylight: 14 hrs 20 mins
Moonrise: 3:58 PM
Moon Transit: 8:42 PM
Moonset: 12:46 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

3:43 AM - 6:13 AM
8:12 PM - 10:42 PM

Minor Periods

3:28 PM - 4:58 PM
12:16 AM - 1:46 AM

Action Rating: 4 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
82.1°F
62.3°F
71°F
34%
0 in
1%
0%
12.1 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 4.05 μg/m3
PM10: 4.57 μg/m3
Carbon Monoxide: 123.17 μg/m3
Nitrogen Dioxide: 5.85 μg/m3
Sulphur Dioxide: 0.62 μg/m3
Ozone: 52 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:04 PM
Sunset: 8:14 PM
Daylight: 14 hrs 18 mins
Moonrise: 4:58 PM
Moon Transit: 9:32 PM
Moonset: 1:22 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

4:32 AM - 7:02 AM
9:02 PM - 11:32 PM

Minor Periods

4:28 PM - 5:58 PM
12:52 AM - 2:22 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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