Water Temperature of the Middle Fork San Joaquin River in Mammoth Lakes, CA

Current Water Temperature

31.8°F

Measurement Time: Saturday, January 17, 2026, 9:00 PM PST

Temperature Locations

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Local Points of Interest

Devils Postpile National Monument

Middle Fork San Joaquin River

Station Name: MF SAN JOAQUIN R NR MAMMOTH LAKES CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 7,618 feet

Nearest Address:
A12 Devils Postpile Campground Rd
Mammoth Lakes, CA 93546
Madera County

GPS Coordinates: 37.63194444, -119.0863889

Nearby Water Temperatures

Deadman Creek, Mammoth Lakes, CA (11.5 mi)
Hot Creek, Mammoth Lakes, CA (12.3 mi)
Hot Creek, Mammoth Lakes, CA (12.9 mi)
Hot Creek, Mammoth Lakes, CA (14.9 mi)
Merced River, Yosemite Valley, CA (26.7 mi)
Tuolumne River, Groveland, CA (37 mi)
Tuolumne River, Groveland, CA (44.2 mi)
Tuolumne River, Groveland, CA (50 mi)
Cherry Creek, Groveland, CA (51 mi)
Tuolumne River, Groveland, CA (51.3 mi)
San Joaquin River, Friant, CA (56.8 mi)
Walker Lake, Walker Lake, NV (76.4 mi)
Walker Lake, Walker Lake, NV (79.8 mi)
Trout Creek, South Lake Tahoe, CA (101.1 mi)
Upper Truckee River, South Lake Tahoe, CA (101.8 mi)

Weather for Mammoth Lakes, California

Current Weather

5.7°F
Overcast
Overcast
-4.3°F
30.4°F
85%
SW 5.4 mph
11.3 mph
24.9°F
11.1°F
0 in
0%
9 mi
1028 mbar
0

Five Day Weather Forecast

Partly Cloudy
Sun
H: 51°F
L: 29°F
Sunny
Mon
H: 49°F
L: 29°F
Partly Cloudy
Tue
H: 49°F
L: 29°F
Patchy rain nearby
Wed
H: 42°F
L: 30°F
Moderate or heavy snow in area with thunder
Thu
H: 36°F
L: 23°F

Air Quality

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:06 AM
Sunset: 5:05 PM
Daylight: 9 hrs 56 mins
Moonrise: 7:23 AM
Moon Transit: 12:10 AM
Moonset: 5:03 PM
Moon Phase: New
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

8:04 PM - 10:34 PM
11:40 AM - 2:10 PM

Minor Periods

4:33 PM - 6:03 PM
6:53 AM - 8:23 AM

Action Rating: 4 out of 5

Sunday, January 18, 2026

Weather Forecast

Partly Cloudy
51.4°F
29.1°F
36.1°F
46%
0 in
0%
0%
5.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 2.05 μg/m3
PM10: 2.38 μg/m3
Carbon Monoxide: 127.67 μg/m3
Nitrogen Dioxide: 3.33 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 95.92 μg/m3

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:06 AM
Sunset: 5:05 PM
Daylight: 9 hrs 56 mins
Moonrise: 7:23 AM
Moon Transit: 12:10 AM
Moonset: 5:03 PM
Moon Phase: New
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

8:04 PM - 10:34 PM
11:40 AM - 2:10 PM

Minor Periods

4:33 PM - 6:03 PM
6:53 AM - 8:23 AM

Action Rating: 4 out of 5

Monday, January 19, 2026

Weather Forecast

Sunny
48.7°F
28.8°F
33.3°F
47%
0 in
0%
0%
4.5 mph
0


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:08 AM
Sun Transit: 12:07 AM
Sunset: 5:06 PM
Daylight: 9 hrs 58 mins
Moonrise: 7:57 AM
Moon Transit: 1:00 PM
Moonset: 6:09 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

8:53 PM - 11:23 PM
12:30 AM - 3:00 PM

Minor Periods

5:39 PM - 7:09 PM
7:27 AM - 8:57 AM

Action Rating: 4 out of 5

Tuesday, January 20, 2026

Weather Forecast

Partly Cloudy
49°F
29.3°F
36°F
41%
0 in
0%
0%
4.3 mph
2


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:08 AM
Sun Transit: 12:07 AM
Sunset: 5:07 PM
Daylight: 9 hrs 59 mins
Moonrise: 8:27 AM
Moon Transit: 1:46 PM
Moonset: 7:14 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:16 PM - 3:46 PM

Minor Periods

6:44 PM - 8:14 PM
7:57 AM - 9:27 AM

Action Rating: 3 out of 5

Wednesday, January 21, 2026

Weather Forecast

Patchy rain nearby
42.4°F
29.8°F
34.2°F
55%
0.01 in
81%
17%
5.1 mph
1


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:07 AM
Sunset: 5:08 PM
Daylight: 10 hrs 1 mins
Moonrise: 8:53 AM
Moon Transit: 2:31 PM
Moonset: 8:20 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:01 PM - 4:31 PM

Minor Periods

7:50 PM - 9:20 PM
8:23 AM - 9:53 AM

Action Rating: 2 out of 5

Thursday, January 22, 2026

Weather Forecast

Moderate or heavy snow in area with thunder
35.6°F
22.5°F
28.9°F
87%
0.07 in
69%
55%
6 mph
1


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:08 AM
Sunset: 5:09 PM
Daylight: 10 hrs 2 mins
Moonrise: 9:17 AM
Moon Transit: 12:00 AM
Moonset: 9:25 PM
Moon Phase: Waxing Crescent
Moon Illumination: 15.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

8:55 PM - 10:25 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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