Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

43.5°F 6.4°C
Frigid Dangerously Cold
43.5°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: Thursday, November 12, 2026, 1:30 PM 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

52.2°F
Clear
Conditions: Clear
Humidity: 32%
Feels Like: 44.1°F
Wind: N 7.7 mph
Wind Gusts: 9.4 mph
Pressure: 29.78 in
Precipitation: 0 in
Cloud Cover: 1%
Visibility: 25.4 mi
UV Index: 0

Five-Day Weather Forecast

Partly Cloudy
Thu
H: 71°F
L: 51°F
Heavy Rain
Fri
H: 54°F
L: 38°F
Moderate Drizzle
Sat
H: 49°F
L: 38°F
Overcast
Sun
H: 54°F
L: 38°F
Moderate Rain
Mon
H: 43°F
L: 36°F

Air Quality

EPA Index 1 • Good

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

PM2.5
8.8 μg/m³
Good
PM10
10.1 μg/m³
Good
Ozone (O3)
80 μg/m³
Photochemical
NO2
4.8 μg/m³
Nitrogen Dioxide
SO2
0.5 μg/m³
Sulfur Dioxide
CO
123 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 14m daylight
Sunrise 6:36 AM
Solar Noon 11:42 AM
Sunset 4:49 PM
Moon
Waxing Crescent • 6%
Moonrise 10:02 AM
Transit 2:34 PM
Moonset 7:09 PM

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
2:04 PM - 4:34 PM

Minor Periods

9:32 AM - 11:02 AM
6:39 PM - 8:09 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 57.9°F
Average Humidity: 21%
Chance of Rain: 1%
Wind: 11.2 mph
UV Index: 4.2

Air Quality

EPA Index 1 • Good
PM2.5
6 μg/m³
Good
PM10
7.3 μg/m³
Good
Ozone (O3)
87 μg/m³
Photochemical
NO2
2.7 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
116.8 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 14m daylight
Sunrise 6:36 AM
Solar Noon 11:42 AM
Sunset 4:49 PM
Moon
Waxing Crescent • 6%
Moonrise 10:02 AM
Transit 2:34 PM
Moonset 7:09 PM

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
2:04 PM - 4:34 PM

Minor Periods

9:32 AM - 11:02 AM
6:39 PM - 8:09 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Heavy Rain
Average Temperature: 46°F
Average Humidity: 82%
Chance of Rain: 100%
Wind: 12.1 mph
UV Index: 3.6

Air Quality

EPA Index 1 • Good
PM2.5
5.2 μg/m³
Good
PM10
6.9 μg/m³
Good
Ozone (O3)
87.1 μg/m³
Photochemical
NO2
2.3 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
121.6 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 12m daylight
Sunrise 6:37 AM
Solar Noon 11:42 AM
Sunset 4:48 PM
Moon
Waxing Crescent • 13%
Moonrise 10:48 AM
Transit 3:25 PM
Moonset 8:06 PM

Best Times for Fishing or Hunting

Major Periods

2:30 AM - 5:00 AM
2:55 PM - 5:25 PM

Minor Periods

10:18 AM - 11:48 AM
7:36 PM - 9:06 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Moderate Drizzle
Average Temperature: 41.7°F
Average Humidity: 79%
Chance of Rain: 24%
Wind: 7.6 mph
UV Index: 4.4

Air Quality

EPA Index 1 • Good
PM2.5
4.3 μg/m³
Good
PM10
5.2 μg/m³
Good
Ozone (O3)
85.3 μg/m³
Photochemical
NO2
2.2 μg/m³
Nitrogen Dioxide
SO2
0.2 μg/m³
Sulfur Dioxide
CO
108.8 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 10m daylight
Sunrise 6:38 AM
Solar Noon 11:42 AM
Sunset 4:48 PM
Moon
Waxing Crescent • 21%
Moonrise 11:26 AM
Transit 4:13 PM
Moonset 9:06 PM

Best Times for Fishing or Hunting

Major Periods

3:19 AM - 5:49 AM
3:43 PM - 6:13 PM

Minor Periods

10:56 AM - 12:26 PM
8:36 PM - 10:06 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 43°F
Average Humidity: 82%
Chance of Rain: 51%
Wind: 9.2 mph
UV Index: 3.9

Air Quality

EPA Index 1 • Good
PM2.5
7.3 μg/m³
Good
PM10
9.2 μg/m³
Good
Ozone (O3)
84.5 μg/m³
Photochemical
NO2
2.5 μg/m³
Nitrogen Dioxide
SO2
0.2 μg/m³
Sulfur Dioxide
CO
114.6 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 8m daylight
Sunrise 6:39 AM
Solar Noon 11:42 AM
Sunset 4:47 PM
Moon
Waxing Crescent • 31%
Moonrise 11:59 AM
Transit 5:00 PM
Moonset 10:07 PM

Best Times for Fishing or Hunting

Major Periods

4:07 AM - 6:37 AM
4:30 PM - 7:00 PM

Minor Periods

11:29 AM - 12:59 PM
9:37 PM - 11:07 PM
Action Rating:
Very Good 4/5
Monday, November 16, 2026

Weather Forecast

Conditions: Moderate Rain
Average Temperature: 40.3°F
Average Humidity: 96%
Chance of Rain: 77%
Wind: 7.9 mph
UV Index: 0.7

Air Quality

EPA Index 1 • Good
PM2.5
2.8 μg/m³
Good
PM10
3.7 μg/m³
Good
Ozone (O3)
78 μg/m³
Photochemical
NO2
2.4 μg/m³
Nitrogen Dioxide
SO2
0.2 μg/m³
Sulfur Dioxide
CO
131.1 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 6m daylight
Sunrise 6:40 AM
Solar Noon 11:43 AM
Sunset 4:46 PM
Moon
First Quarter • 42%
Moonrise 12:28 PM
Transit 5:44 PM
Moonset 11:08 PM

Best Times for Fishing or Hunting

Major Periods

4:52 AM - 7:22 AM
5:14 PM - 7:44 PM

Minor Periods

11:58 AM - 1:28 PM
10:38 PM - 12:08 AM
Action Rating:
Good Action 3/5
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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