Water Temperature of the Merced River in Yosemite Valley, CA
Current Water Temperature
Measurement Time: Sunday, July 20, 2025, 9:30 AM PDT
Temperature Locations
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Local Points of Interest
Happy Isles Bridge; Yosemite National ParkSponsored Content
Station Name: MERCED R A HAPPY ISLES BRIDGE NR YOSEMITE CA
Data Source: Water Data - usgc.gov
Elevation Above Sea Level: 4,094 feet / 1,248 meters
Nearest Address:
Happy Isle Loop Rd
Yosemite Valley, CA 95389
Mariposa County
GPS Coordinates: 37.73131496, -119.5590514
Nearby Water Temperatures
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Middle Fork San Joaquin River, Mammoth Lakes, CA (26.7 mi)
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San Joaquin River, Friant, CA (52.4 mi)
Walker Lake, Walker Lake, NV (80.9 mi)
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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

Humidity: 40%
Feels Like: 75.3°F
Wind: WSW 11 mph
Wind Gusts: 12.6 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 3.3
Five Day Weather Forecast

Sun
H: 74°F
L: 60°F

Mon
H: 68°F
L: 51°F

Tue
H: 64°F
L: 51°F

Wed
H: 64°F
L: 50°F

Thu
H: 68°F
L: 48°F
Air Quality
Nitrogen Dioxide: 8.51 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 109 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:17 PM
Daylight: 14 hrs 24 mins
Moon Transit: 9:04 AM
Moonset: 4:54 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%
Best Times for Fishing or Hunting
Major Periods
8:34 AM - 11:04 AM4:58 PM - 7:28 PM
Minor Periods
4:24 PM - 5:54 PM12:54 AM - 2:24 AM
Action Rating: 2 out of 5
Lake Wind Advisory issued July 20 at 1:46AM PDT until July 20 at 11:00PM PDT by NWS Reno NV
Effective: Sun July 20, 2025, 1:46 AM
Expires: Mon July 21, 2025, 11:00 AM
* WHAT...For the first Lake Wind Advisory, west winds 15 to 20 mph with gusts up to 30 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. For the second Lake Wind Advisory, west winds 20 to 25 mph with gusts up to 35 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. * WHERE...Greater Lake Tahoe Area, and Western Nevada Basin and Range including Pyramid Lake. * WHEN...For the first Lake Wind Advisory, from 2 PM this afternoon to 11 PM PDT this evening. For the second Lake Wind Advisory, from 11 AM to 11 PM PDT Monday. * 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.
Lake Wind Advisory issued July 20 at 1:46AM PDT until July 21 at 11:00PM PDT by NWS Reno NV
Effective: Sun July 20, 2025, 1:46 AM
Expires: Mon July 21, 2025, 11:00 AM
* WHAT...For the first Lake Wind Advisory, west winds 15 to 20 mph with gusts up to 30 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. For the second Lake Wind Advisory, west winds 20 to 25 mph with gusts up to 35 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. * WHERE...Greater Lake Tahoe Area, and Western Nevada Basin and Range including Pyramid Lake. * WHEN...For the first Lake Wind Advisory, from 2 PM this afternoon to 11 PM PDT this evening. For the second Lake Wind Advisory, from 11 AM to 11 PM PDT Monday. * 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.
Lake Wind Advisory issued July 20 at 1:46AM PDT until July 20 at 11:00PM PDT by NWS Reno NV
Effective: Sun July 20, 2025, 1:46 AM
Expires: Mon July 21, 2025, 11:00 AM
* WHAT...For the first Lake Wind Advisory, west winds 15 to 20 mph with gusts up to 30 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. For the second Lake Wind Advisory, west winds 20 to 25 mph with gusts up to 35 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. * WHERE...Greater Lake Tahoe Area, and Western Nevada Basin and Range including Pyramid Lake. * WHEN...For the first Lake Wind Advisory, from 2 PM this afternoon to 11 PM PDT this evening. For the second Lake Wind Advisory, from 11 AM to 11 PM PDT Monday. * 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.
Lake Wind Advisory issued July 20 at 1:46AM PDT until July 21 at 11:00PM PDT by NWS Reno NV
Effective: Sun July 20, 2025, 1:46 AM
Expires: Mon July 21, 2025, 11:00 AM
* WHAT...For the first Lake Wind Advisory, west winds 15 to 20 mph with gusts up to 30 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. For the second Lake Wind Advisory, west winds 20 to 25 mph with gusts up to 35 mph and wave heights of 1 to 3 feet on Lake Tahoe and Pyramid Lake. * WHERE...Greater Lake Tahoe Area, and Western Nevada Basin and Range including Pyramid Lake. * WHEN...For the first Lake Wind Advisory, from 2 PM this afternoon to 11 PM PDT this evening. For the second Lake Wind Advisory, from 11 AM to 11 PM PDT Monday. * 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.
Weather Forecast
Average Temperature: 66.9°F
Average Humidity: 42%
Wind: 12.1 mph
UV Index: 3
Air Quality
Nitrogen Dioxide: 4.17 μg/m3
Sulphur Dioxide: 1.47 μg/m3
Ozone: 120.68 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:17 PM
Daylight: 14 hrs 24 mins
Moon Transit: 9:04 AM
Moonset: 4:54 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%
Best Times for Fishing or Hunting
Major Periods
8:34 AM - 11:04 AM4:58 PM - 7:28 PM
Minor Periods
4:24 PM - 5:54 PM12:54 AM - 2:24 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 60.1°F
Average Humidity: 45%
Wind: 12.3 mph
UV Index: 3.1
Air Quality
Nitrogen Dioxide: 3.58 μg/m3
Sulphur Dioxide: 1.12 μg/m3
Ozone: 122.6 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:16 PM
Daylight: 14 hrs 23 mins
Moon Transit: 10:07 AM
Moonset: 6:05 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.4%
Best Times for Fishing or Hunting
Major Periods
6:01 PM - 8:31 PM9:37 AM - 12:07 AM
Minor Periods
5:35 PM - 7:05 PM1:43 AM - 3:13 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 56.5°F
Average Humidity: 52%
Wind: 11.2 mph
UV Index: 3
Air Quality
Nitrogen Dioxide: 4.08 μg/m3
Sulphur Dioxide: 1.03 μg/m3
Ozone: 93.88 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:15 PM
Daylight: 14 hrs 21 mins
Moon Transit: 11:10 AM
Moonset: 7:07 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.6%
Best Times for Fishing or Hunting
Major Periods
7:05 PM - 9:35 PM10:40 AM - 1:10 PM
Minor Periods
6:37 PM - 8:07 PM2:42 AM - 4:12 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 54.1°F
Average Humidity: 45%
Wind: 12.1 mph
UV Index: 3
Air Quality
Nitrogen Dioxide: 4.62 μg/m3
Sulphur Dioxide: 1.44 μg/m3
Ozone: 95.8 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:14 PM
Daylight: 14 hrs 20 mins
Moon Transit: 12:12 AM
Moonset: 7:58 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%
Best Times for Fishing or Hunting
Major Periods
8:06 PM - 10:36 PM11:42 AM - 2:12 PM
Minor Periods
7:28 PM - 8:58 PM3:50 AM - 5:20 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 57.6°F
Average Humidity: 45%
Wind: 11.9 mph
UV Index: 3
Air Quality
Nitrogen Dioxide: 6.59 μg/m3
Sulphur Dioxide: 1.57 μg/m3
Ozone: 95.08 μg/m3
Astronomical
Sun Transit: 1:04 PM
Sunset: 8:14 PM
Daylight: 14 hrs 18 mins
Moon Transit: 1:10 PM
Moonset: 8:39 PM
Moon Phase: New
Moon Illumination: 0.4%
Best Times for Fishing or Hunting
Major Periods
9:02 PM - 11:32 PM12:40 AM - 3:10 PM
Minor Periods
8:09 PM - 9:39 PM5:02 AM - 6:32 AM
Action Rating: 4 out of 5