California Water Temperatures
Current lake & river temperatures in California — updated daily from USGS sensors.
California — Ranked by Temperature
100 with data| # | Water Body | °F | °C | Condition | 🏊 | Date |
|---|---|---|---|---|---|---|
| 1 | Hot C A Flume Nr Mammoth Lakes Ca Lake | 94.5° | 34.7° | 🔥 Hot | 🏊 Excellent | May 19 |
| 2 | Nacimiento R Bl Sapaque C Nr Bryson Ca Lake | 87.8° | 31° | 🔥 Hot | 🏊 Excellent | Aug 6 |
| 3 | San Antonio R Nr Lockwood Ca Lake | 85.1° | 29.5° | 🔥 Hot | 🏊 Excellent | May 15 |
| 4 | Elder C Nr Paskenta Ca Lake | 82.9° | 28.3° | ☀️ Warm | 🏊 Excellent | Sep 3 |
| 5 | San Lorenzo C A San Lorenzo Ca Lake | 82.6° | 28.1° | ☀️ Warm | 🏊 Excellent | Aug 18 |
| 6 | Arroyo Trabuco A San Juan Capistrano Ca Lake | 80.6° | 27° | ☀️ Warm | 🏊 Excellent | Sep 24 |
| 7 | Nf Kings R A 24Th Ave Br Nr Lemoore Ca Lake | 80.1° | 26.7° | ☀️ Warm | 🏊 Excellent | Jun 5 |
| 8 | Arroyo Valle Bl Lang Cyn Nr Livermore Ca Lake | 79.7° | 26.5° | ☀️ Warm | ✅ Good | May 14 |
| 9 | Colorado River Above Imperial Dam, Az-Ca River | 79.7° | 26.5° | ☀️ Warm | ✅ Good | Jun 4 |
| 10 | San Joaquin R Ab Merced R Nr Newman Ca Lake | 78.1° | 25.6° | ☀️ Warm | ✅ Good | Jun 5 |
| 11 | Deer C Nr Smartsville Ca Lake | 77.9° | 25.5° | ☀️ Warm | ✅ Good | Jun 30 |
| 12 | San Joaquin R A Fremont Ford Bridge Ca Lake | 77.9° | 25.5° | ☀️ Warm | ✅ Good | Jun 5 |
| 13 | San Joaquin R Nr Crows Landing Ca Lake | 77.7° | 25.4° | ☀️ Warm | ✅ Good | Jun 5 |
| 14 | New R At International Boundary At Calexico Ca Lake | 77.7° | 25.4° | ☀️ Warm | ✅ Good | Sep 29 |
| 15 | San Luis Rey R A Oceanside Ca Lake | 77° | 25° | ☀️ Warm | ✅ Good | Sep 29 |
| 16 | Santa Margarita R A Ysidora Ca Lake | 77° | 25° | ☀️ Warm | ✅ Good | Jun 27 |
| 17 | White R Nr Ducor Ca Lake | 76.5° | 24.7° | ☀️ Warm | ✅ Good | Jun 5 |
| 18 | Santa Margarita R Nr Temecula Ca Lake | 75.6° | 24.2° | ☀️ Warm | ✅ Good | Jun 5 |
| 19 | Cross C A Kansas Ave Nr Hanford Ca Lake | 75.4° | 24.1° | ☀️ Warm | ✅ Good | Jun 5 |
| 20 | Coyote C Nr Edenvale Ca Lake | 75° | 23.9° | ☀️ Warm | ✅ Good | Jul 4 |
| 21 | Salinas R Nr Spreckels Ca Lake | 74.3° | 23.5° | 🌤️ Comfortable | ✅ Good | Jan 17 |
| 22 | Deer C A Road 272 Bridge Nr Porterville Ca Lake | 74.3° | 23.5° | 🌤️ Comfortable | ✅ Good | Jun 5 |
| 23 | Coyote C Bl Coyote Ranch Rd Nr Coyote Ca Lake | 73.9° | 23.3° | 🌤️ Comfortable | ✅ Good | Jul 4 |
| 24 | Santa Ana R Bl Prado Dam Ca Reservoir | 73.8° | 23.2° | 🌤️ Comfortable | ✅ Good | Apr 23 |
| 25 | Cucamonga C Nr Mira Loma Ca Lake | 73.4° | 23° | 🌤️ Comfortable | ✅ Good | Sep 30 |
More California Resources
❓ California Water Temperature FAQ
What is the warmest lake in California today?
Based on our latest USGS data, Hot C A Flume Nr Mammoth Lakes Ca is currently the warmest water body in California at 94.5°F.
Which California lakes are good for swimming right now?
Lakes with water temperatures above 72°F are generally comfortable for swimming. Currently, California's average water temperature is 69.8°F — check individual lakes above for specific conditions.
What is the best water temperature for fishing in California?
The optimal temperature range depends on your target species. For bass fishing, look for water bodies between 65–75°F. For trout, target the coldest water bodies in California — typically 50–65°F. Use the table above to identify which lakes are in the ideal range for your target species.
🔬 Data Methodology & Sources
Water temperature readings on this site are collected from USGS (United States Geological Survey) monitoring stations installed at lakes, rivers, and reservoirs across the country. Sensors measure water surface temperature in Celsius, which is converted to Fahrenheit for display. Data is retrieved and stored daily. Temperatures shown reflect the most recent available sensor reading for each water body, typically from the past 1–30 days depending on station reporting frequency.
⚠️ Water temperatures can vary significantly across a water body due to depth, currents, and time of day. Sensor readings represent conditions at the monitoring station location. Always exercise caution when swimming and consult local authorities for official safety advisories.