Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

36.1°F

Measurement Time: Monday, February 2, 2026, 2:30 AM PST

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

32.2°F
Sunny
Sunny
30.7°F
49.6°F
59%
ESE 2.2 mph
6.7 mph
47.1°F
35.2°F
0 in
0%
9 mi
1030 mbar
3.3

Five Day Weather Forecast

Sunny
Mon
H: 56°F
L: 37°F
Sunny
Tue
H: 57°F
L: 37°F
Sunny
Wed
H: 58°F
L: 35°F
Sunny
Thu
H: 53°F
L: 40°F
Patchy rain nearby
Fri
H: 47°F
L: 37°F

Air Quality

AQI: 1 - Good
PM2.5: 6.75 μg/m3
PM10: 7.55 μg/m3
Carbon Monoxide: 140.85 μg/m3
Nitrogen Dioxide: 7.55 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 73 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:11 AM
Sunset: 5:23 PM
Daylight: 10 hrs 22 mins
Moonrise: 6:35 PM
Moon Transit: 12:36 AM
Moonset: 7:39 AM
Moon Phase: Full
Moon Illumination: 99.4%

Best Times for Fishing or Hunting

Major Periods

12:06 AM - 2:36 AM
8:27 AM - 10:57 AM

Minor Periods

6:05 PM - 7:35 PM
7:09 AM - 8:39 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued February 1 at 8:46PM PST until February 2 at 12:00PM PST by NWS Hanford CA

Effective: Sun February 1, 2026, 8:46 PM
Expires: Mon February 2, 2026, 5:00 AM

* WHAT...Visibility from one quarter mile down to 200 feet or less in dense fog. * WHERE...A portion of central California. * WHEN...Until noon PST Monday. * IMPACTS...Low visibility could make driving conditions dangerous. * ADDITIONAL DETAILS...Highways impacted include, but are not limited to Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 180 and 198.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued February 2 at 4:49AM PST until February 2 at 12:00PM PST by NWS Hanford CA

Effective: Mon February 2, 2026, 4:49 AM
Expires: Mon February 2, 2026, 12:00 PM

* WHAT...Visibility from one quarter mile down to 200 feet or less in dense fog. * WHERE...A portion of central California. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions dangerous. * ADDITIONAL DETAILS...Highways impacted include, but are not limited to Interstate 5, State Routes 99, 41, 43, 46, 58, 59, 140, 152, 165, 180 and 198.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued February 1 at 12:59PM PST until February 2 at 12:00PM PST by NWS Sacramento CA

Effective: Sun February 1, 2026, 12:59 PM
Expires: Mon February 2, 2026, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Northern San Joaquin Valley and Southern Sacramento Valley. * WHEN...From 11 PM this evening to noon PST Monday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Monday, February 2, 2026

Weather Forecast

Sunny
55.8°F
37°F
44.9°F
45%
0 in
0%
0%
9.6 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 5.09 μg/m3
PM10: 6.05 μg/m3
Carbon Monoxide: 130.41 μg/m3
Nitrogen Dioxide: 3.49 μg/m3
Sulphur Dioxide: 1.8 μg/m3
Ozone: 84 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:11 AM
Sunset: 5:23 PM
Daylight: 10 hrs 22 mins
Moonrise: 6:35 PM
Moon Transit: 12:36 AM
Moonset: 7:39 AM
Moon Phase: Full
Moon Illumination: 99.4%

Best Times for Fishing or Hunting

Major Periods

12:06 AM - 2:36 AM
8:27 AM - 10:57 AM

Minor Periods

6:05 PM - 7:35 PM
7:09 AM - 8:39 AM

Action Rating: 4 out of 5

Tuesday, February 3, 2026

Weather Forecast

Sunny
57°F
37.3°F
45.4°F
30%
0 in
0%
0%
9.6 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 4.75 μg/m3
PM10: 5.49 μg/m3
Carbon Monoxide: 130.53 μg/m3
Nitrogen Dioxide: 3.69 μg/m3
Sulphur Dioxide: 1.67 μg/m3
Ozone: 83.92 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:12 AM
Sunset: 5:24 PM
Daylight: 10 hrs 24 mins
Moonrise: 7:42 PM
Moon Transit: 1:26 AM
Moonset: 8:06 AM
Moon Phase: Full
Moon Illumination: 96.3%

Best Times for Fishing or Hunting

Major Periods

12:56 AM - 3:26 AM
9:15 AM - 11:45 AM

Minor Periods

7:12 PM - 8:42 PM
7:36 AM - 9:06 AM

Action Rating: 3 out of 5

Wednesday, February 4, 2026

Weather Forecast

Sunny
58.3°F
35.2°F
44.8°F
26%
0 in
0%
0%
10.3 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 3.57 μg/m3
PM10: 3.94 μg/m3
Carbon Monoxide: 120.25 μg/m3
Nitrogen Dioxide: 3.61 μg/m3
Sulphur Dioxide: 1.47 μg/m3
Ozone: 86.56 μg/m3

Astronomical

Sunrise: 6:59 AM
Sun Transit: 12:12 AM
Sunset: 5:25 PM
Daylight: 10 hrs 26 mins
Moonrise: 8:47 PM
Moon Transit: 2:12 AM
Moonset: 8:31 AM
Moon Phase: Full
Moon Illumination: 90.9%

Best Times for Fishing or Hunting

Major Periods

1:42 AM - 4:12 AM
10:00 AM - 12:30 AM

Minor Periods

8:17 PM - 9:47 PM
8:01 AM - 9:31 AM

Action Rating: 3 out of 5

Thursday, February 5, 2026

Weather Forecast

Sunny
53.4°F
39.7°F
44.6°F
34%
0 in
0%
0%
8.3 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 3.27 μg/m3
PM10: 3.63 μg/m3
Carbon Monoxide: 124.8 μg/m3
Nitrogen Dioxide: 3.47 μg/m3
Sulphur Dioxide: 1.47 μg/m3
Ozone: 87.72 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:12 AM
Sunset: 5:26 PM
Daylight: 10 hrs 28 mins
Moonrise: 9:50 PM
Moon Transit: 2:55 AM
Moonset: 8:54 AM
Moon Phase: Waning Gibbous
Moon Illumination: 83.4%

Best Times for Fishing or Hunting

Major Periods

2:25 AM - 4:55 AM
10:43 AM - 1:13 PM

Minor Periods

9:20 PM - 10:50 PM
8:24 AM - 9:54 AM

Action Rating: 2 out of 5

Friday, February 6, 2026

Weather Forecast

Patchy rain nearby
46.5°F
36.6°F
42°F
53%
0.03 in
89%
0%
6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.63 μg/m3
PM10: 4.29 μg/m3
Carbon Monoxide: 156.33 μg/m3
Nitrogen Dioxide: 4.52 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 82.08 μg/m3

Astronomical

Sunrise: 6:57 AM
Sun Transit: 12:12 AM
Sunset: 5:27 PM
Daylight: 10 hrs 30 mins
Moonrise: 10:51 PM
Moon Transit: 3:37 AM
Moonset: 9:17 AM
Moon Phase: Waning Gibbous
Moon Illumination: 74.1%

Best Times for Fishing or Hunting

Major Periods

3:07 AM - 5:37 AM
11:25 AM - 1:55 PM

Minor Periods

10:21 PM - 11:51 PM
8:47 AM - 10:17 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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