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

Current Water Temperature

32.0°F 0.0°C
Frigid Dangerously Cold
32.0°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 13, 2026, 3:00 PM PST

Temperature Locations

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Local Points of Interest

Devils Postpile National Monument

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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

28.4°F
Overcast
Conditions: Overcast
Humidity: 98%
Feels Like: 17.8°F
Wind: SW 15 mph
Wind Gusts: 26 mph
Pressure: 29.79 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 7.6 mi
UV Index: 0

Five-Day Weather Forecast

Heavy Snow
Fri
H: 36°F
L: 27°F
Overcast
Sat
H: 37°F
L: 22°F
Overcast
Sun
H: 41°F
L: 23°F
Moderate Snow
Mon
H: 36°F
L: 24°F
Moderate Snow
Tue
H: 31°F
L: 8°F

Air Quality

EPA Index 1 • Good

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

PM2.5
0.3 μg/m³
Good
PM10
0.3 μg/m³
Good
Ozone (O3)
85 μg/m³
Photochemical
NO2
0.8 μg/m³
Nitrogen Dioxide
SO2
0 μg/m³
Sulfur Dioxide
CO
114 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 12m daylight
Sunrise 6:35 AM
Solar Noon 11:40 AM
Sunset 4:47 PM
Moon
Waxing Crescent • 13%
Moonrise 10:45 AM
Transit 3:23 PM
Moonset 8:05 PM

Best Times for Fishing or Hunting

Major Periods

2:28 AM - 4:58 AM
2:53 PM - 5:23 PM

Minor Periods

10:15 AM - 11:45 AM
7:35 PM - 9:05 PM
Action Rating:
Fair Action 2/5
Friday, November 13, 2026

Weather Forecast

Conditions: Heavy Snow
Average Temperature: 32.9°F
Average Humidity: 90%
Chance of Rain: 97%
Wind: 28.5 mph
UV Index: 2.6

Air Quality

EPA Index 2 • Moderate
PM2.5
7 μg/m³
Good
PM10
7.9 μg/m³
Good
Ozone (O3)
85 μg/m³
Photochemical
NO2
3 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
127.3 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 12m daylight
Sunrise 6:35 AM
Solar Noon 11:40 AM
Sunset 4:47 PM
Moon
Waxing Crescent • 13%
Moonrise 10:45 AM
Transit 3:23 PM
Moonset 8:05 PM

Best Times for Fishing or Hunting

Major Periods

2:28 AM - 4:58 AM
2:53 PM - 5:23 PM

Minor Periods

10:15 AM - 11:45 AM
7:35 PM - 9:05 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 30.6°F
Average Humidity: 68%
Chance of Rain: 4%
Wind: 18.6 mph
UV Index: 4.7

Air Quality

EPA Index 2 • Moderate
PM2.5
11.6 μg/m³
Good
PM10
12.6 μg/m³
Good
Ozone (O3)
104.1 μg/m³
Photochemical
NO2
1.7 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
111.4 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 10m daylight
Sunrise 6:36 AM
Solar Noon 11:40 AM
Sunset 4:46 PM
Moon
Waxing Crescent • 21%
Moonrise 11:24 AM
Transit 4:11 PM
Moonset 9:04 PM

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
3:41 PM - 6:11 PM

Minor Periods

10:54 AM - 12:24 PM
8:34 PM - 10:04 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 31.6°F
Average Humidity: 67%
Chance of Rain: 10%
Wind: 15.5 mph
UV Index: 4.6

Air Quality

EPA Index 2 • Moderate
PM2.5
18.6 μg/m³
Moderate
PM10
20.5 μg/m³
Good
Ozone (O3)
106 μg/m³
Photochemical
NO2
2.9 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
124.3 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 9m daylight
Sunrise 6:37 AM
Solar Noon 11:41 AM
Sunset 4:45 PM
Moon
Waxing Crescent • 31%
Moonrise 11:57 AM
Transit 4:57 PM
Moonset 10:05 PM

Best Times for Fishing or Hunting

Major Periods

4:05 AM - 6:35 AM
4:27 PM - 6:57 PM

Minor Periods

11:27 AM - 12:57 PM
9:35 PM - 11:05 PM
Action Rating:
Very Good 4/5
Monday, November 16, 2026

Weather Forecast

Conditions: Moderate Snow
Average Temperature: 30°F
Average Humidity: 92%
Chance of Rain: 89%
Wind: 9.4 mph
UV Index: 3.2

Air Quality

EPA Index 2 • Moderate
PM2.5
4.2 μg/m³
Good
PM10
4.8 μg/m³
Good
Ozone (O3)
82.2 μg/m³
Photochemical
NO2
4.3 μg/m³
Nitrogen Dioxide
SO2
0.1 μg/m³
Sulfur Dioxide
CO
129.3 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 7m daylight
Sunrise 6:38 AM
Solar Noon 11:41 AM
Sunset 4:45 PM
Moon
First Quarter • 42%
Moonrise 12:26 PM
Transit 5:42 PM
Moonset 11:06 PM

Best Times for Fishing or Hunting

Major Periods

4:50 AM - 7:20 AM
5:12 PM - 7:42 PM

Minor Periods

11:56 AM - 1:26 PM
10:36 PM - 12:06 AM
Action Rating:
Good Action 3/5
Tuesday, November 17, 2026

Weather Forecast

Conditions: Moderate Snow
Average Temperature: 23.2°F
Average Humidity: 89%
Chance of Rain: 39%
Wind: 7.2 mph
UV Index: 4

Air Quality

EPA Index 1 • Good
PM2.5
3.9 μg/m³
Good
PM10
4.5 μg/m³
Good
Ozone (O3)
87.3 μg/m³
Photochemical
NO2
2.8 μg/m³
Nitrogen Dioxide
SO2
0.2 μg/m³
Sulfur Dioxide
CO
137.8 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 5m daylight
Sunrise 6:39 AM
Solar Noon 11:41 AM
Sunset 4:44 PM
Moon
First Quarter • 54%
Moonrise 12:51 PM
Transit 6:24 PM
Moonset 1:17 AM

Best Times for Fishing or Hunting

Major Periods

5:33 AM - 8:03 AM
5:54 PM - 8:24 PM

Minor Periods

12:47 AM - 2:17 AM
12:21 PM - 1:51 PM
Action Rating:
Fair Action 2/5
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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