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

Current Water Temperature

37.0°F 2.8°C
Frigid Dangerously Cold
37.0°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 6, 2026, 2:00 PM PST

Temperature Locations

View Nearby Locations     View All California Locations     View Locations Near Me

Local Points of Interest

Devils Postpile National Monument

Sponsored Content

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

31.3°F
Clear
Conditions: Clear
Humidity: 45%
Feels Like: 25°F
Wind: NNW 2.2 mph
Wind Gusts: 6.8 mph
Pressure: 30.27 in
Precipitation: 0 in
Cloud Cover: 2%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Fri
H: 52°F
L: 27°F
Sunny
Sat
H: 60°F
L: 31°F
Sunny
Sun
H: 62°F
L: 32°F

Air Quality

EPA Index 1 • Good

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

PM2.5
0.8 μg/m³
Good
PM10
1.2 μg/m³
Good
Ozone (O3)
72 μg/m³
Photochemical
NO2
2.7 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
119 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 26m daylight
Sunrise 6:27 AM
Solar Noon 11:40 AM
Sunset 4:53 PM
Moon
Waning Crescent • 5%
Moonrise 3:55 AM
Transit 9:40 AM
Moonset 3:17 PM

Best Times for Fishing or Hunting

Major Periods

9:10 AM - 11:40 AM
9:32 PM - 12:02 AM

Minor Periods

3:25 AM - 4:55 AM
2:47 PM - 4:17 PM
Action Rating:
Fair Action 2/5
Friday, November 6, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 36.7°F
Average Humidity: 29%
Chance of Rain: 2%
Wind: 6.3 mph
UV Index: 4.4

Astronomical

Sun
10h 26m daylight
Sunrise 6:27 AM
Solar Noon 11:40 AM
Sunset 4:53 PM
Moon
Waning Crescent • 5%
Moonrise 3:55 AM
Transit 9:40 AM
Moonset 3:17 PM

Best Times for Fishing or Hunting

Major Periods

9:10 AM - 11:40 AM
9:32 PM - 12:02 AM

Minor Periods

3:25 AM - 4:55 AM
2:47 PM - 4:17 PM
Action Rating:
Fair Action 2/5
Saturday, November 7, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 42.4°F
Average Humidity: 30%
Chance of Rain: 2%
Wind: 6.7 mph
UV Index: 4.3

Astronomical

Sun
10h 24m daylight
Sunrise 6:28 AM
Solar Noon 11:40 AM
Sunset 4:52 PM
Moon
Waning Crescent • 1%
Moonrise 4:59 AM
Transit 10:24 AM
Moonset 3:43 PM

Best Times for Fishing or Hunting

Major Periods

9:54 AM - 12:24 PM
10:17 PM - 12:47 AM

Minor Periods

4:29 AM - 5:59 AM
3:13 PM - 4:43 PM
Action Rating:
Very Good 4/5
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 44.2°F
Average Humidity: 33%
Chance of Rain: 3%
Wind: 6.5 mph
UV Index: 4.2

Astronomical

Sun
10h 22m daylight
Sunrise 6:29 AM
Solar Noon 11:40 AM
Sunset 4:51 PM
Moon
New • 0%
Moonrise 6:03 AM
Transit 11:11 AM
Moonset 4:13 PM

Best Times for Fishing or Hunting

Major Periods

10:41 AM - 1:11 PM
11:05 PM - 1:35 AM

Minor Periods

5:33 AM - 7:03 AM
3:43 PM - 5:13 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.

Webcams Near Mammoth Lakes, CA

Sponsored Content