Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

43.3°F 6.3°C
Frigid Dangerously Cold
43.3°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Friday, November 6, 2026, 11:30 AM PST

Temperature Locations

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Local Points of Interest

Happy Isles Bridge; Yosemite National Park

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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

37°F
Partly Cloudy
Conditions: Partly Cloudy
Humidity: 30%
Feels Like: 30°F
Wind: ENE 9.8 mph
Wind Gusts: 21 mph
Pressure: 30.22 in
Precipitation: 0 in
Cloud Cover: 34%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Fri
H: 57°F
L: 31°F
Sunny
Sat
H: 60°F
L: 37°F
Sunny
Sun
H: 58°F
L: 37°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
2.7 μg/m³
Good
PM10
3.7 μg/m³
Good
Ozone (O3)
49 μg/m³
Photochemical
NO2
4.8 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
108 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 25m daylight
Sunrise 6:29 AM
Solar Noon 11:41 AM
Sunset 4:54 PM
Moon
Waning Crescent • 5%
Moonrise 3:57 AM
Transit 9:42 AM
Moonset 3:18 PM

Best Times for Fishing or Hunting

Major Periods

9:12 AM - 11:42 AM
9:34 PM - 12:04 AM

Minor Periods

3:27 AM - 4:57 AM
2:48 PM - 4:18 PM
Action Rating:
Fair Action 2/5
Friday, November 6, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 41°F
Average Humidity: 31%
Chance of Rain: 3%
Wind: 10.1 mph
UV Index: 3.8

Astronomical

Sun
10h 25m daylight
Sunrise 6:29 AM
Solar Noon 11:41 AM
Sunset 4:54 PM
Moon
Waning Crescent • 5%
Moonrise 3:57 AM
Transit 9:42 AM
Moonset 3:18 PM

Best Times for Fishing or Hunting

Major Periods

9:12 AM - 11:42 AM
9:34 PM - 12:04 AM

Minor Periods

3:27 AM - 4:57 AM
2:48 PM - 4:18 PM
Action Rating:
Fair Action 2/5
Saturday, November 7, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 44.9°F
Average Humidity: 34%
Chance of Rain: 3%
Wind: 8.7 mph
UV Index: 3.3

Astronomical

Sun
10h 23m daylight
Sunrise 6:30 AM
Solar Noon 11:41 AM
Sunset 4:54 PM
Moon
Waning Crescent • 1%
Moonrise 5:01 AM
Transit 10:26 AM
Moonset 3:45 PM

Best Times for Fishing or Hunting

Major Periods

9:56 AM - 12:26 PM
10:19 PM - 12:49 AM

Minor Periods

4:31 AM - 6:01 AM
3:15 PM - 4:45 PM
Action Rating:
Very Good 4/5
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 44.4°F
Average Humidity: 37%
Chance of Rain: 4%
Wind: 6.7 mph
UV Index: 3.5

Astronomical

Sun
10h 21m daylight
Sunrise 6:31 AM
Solar Noon 11:42 AM
Sunset 4:53 PM
Moon
New • 0%
Moonrise 6:05 AM
Transit 11:13 AM
Moonset 4:15 PM

Best Times for Fishing or Hunting

Major Periods

10:43 AM - 1:13 PM
11:07 PM - 1:37 AM

Minor Periods

5:35 AM - 7:05 AM
3:45 PM - 5:15 PM
Action Rating:
Very Good 4/5
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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