Live readings · updated daily
Water temperature in California
The latest readings from USGS real-time water sensors across California, warmest first. Snapshot updated October 19, 2026.
Warmest sensor reading right now
89°F32°C
USGS gauge HOT C A FLUME NR MAMMOTH LAKES CA · as of 20 hrs ago
All reporting stations (warmest 50 of 537)
| Station | Water temp | Streamflow | Gage height | Observed |
|---|---|---|---|---|
| HOT C A FLUME NR MAMMOTH LAKES CAUSGS gauge | 89°F32°C | 36 ft³/s | 0.98 ft | 20 hrs ago |
| COLORADO RIVER ABOVE IMPERIAL DAM, AZ-CAUSGS gauge | 71°F22°C | — | — | 20 hrs ago |
| MUD SLOUGH NR GUSTINE CAUSGS gauge | 68°F20°C | 69 ft³/s | 5.74 ft | 19 hrs ago |
| SF BAY A SAN MATEO BRIDGE NR FOSTER CITY CAUSGS gauge | 68°F20°C | — | — | 20 hrs ago |
| SOUTH SAN FRANCISCO BAY AT DUMBARTON BRIDGE CAUSGS gauge | 68°F20°C | — | — | 19 hrs ago |
| SALT POND A4 NR ALVISO CAUSGS gauge | 67°F19°C | — | — | 19 hrs ago |
| SANTA YNEZ R A NARROWS NR LOMPOC CAUSGS gauge | 66°F19°C | 3 ft³/s | 1.62 ft | 19 hrs ago |
| CARQUINEZ STRAIT A CARQUINEZ BR NR CROCKETT CAUSGS gauge | 66°F19°C | — | — | 20 hrs ago |
| SAN JOAQUIN R NR CROWS LANDING CAUSGS gauge | 66°F19°C | 331 ft³/s | 36.91 ft | 19 hrs ago |
| SUISUN BAY A BENICIA BRIDGE NR BENICIA CAUSGS gauge | 66°F19°C | — | — | 20 hrs ago |
| NURSE SLOUGH A BRADMOOR ISLAND NR BIRDS LANDING CAUSGS gauge | 65°F18°C | — | — | 19 hrs ago |
| SAN FRANCISCO BAY A RICHMOND-SAN RAFAEL BRIDGE CAUSGS gauge | 65°F18°C | — | — | 20 hrs ago |
| SAN JOAQUIN R AB MERCED R NR NEWMAN CAUSGS gauge | 65°F18°C | 156 ft³/s | 48.80 ft | 19 hrs ago |
| SANTA YNEZ R A SOLVANG CAUSGS gauge | 65°F18°C | 16 ft³/s | 4.35 ft | 19 hrs ago |
| ALAMEDA C A SUNOL WATER TEMPLE A SUNOL CAUSGS gauge | 64°F18°C | 15 ft³/s | 2.60 ft | 19 hrs ago |
| COYOTE C NR MADRONE CAUSGS gauge | 64°F18°C | 11 ft³/s | 2.03 ft | 19 hrs ago |
| SANTA MARGARITA R NR TEMECULA CAUSGS gauge | 64°F18°C | 4 ft³/s | 1.67 ft | 20 hrs ago |
| AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CAUSGS gauge | 64°F18°C | — | — | 19 hrs ago |
| FIRST MALLARD BRANCH NR FAIRFIELD CAUSGS gauge | 64°F18°C | 124 ft³/s | 25.18 ft | 19 hrs ago |
| TECOLOTE C AB FOOTBRIDGE NR SAN DIEGO CAUSGS gauge | 64°F18°C | 0 ft³/s | 2.10 ft | 20 hrs ago |
| JALAMA C NR LOMPOC CAUSGS gauge | 64°F18°C | 0 ft³/s | 3.14 ft | 19 hrs ago |
| SAN FRANCISCO BAY A NE SHORE ALCATRAZ ISLAND CAUSGS gauge | 64°F18°C | — | — | 20 hrs ago |
| SAN FRANCISCO BAY A PIER 17 A SAN FRANCISCO CAUSGS gauge | 64°F18°C | — | — | 20 hrs ago |
| SACRAMENTO R A FREEPORT CAUSGS gauge | 63°F17°C | 9,100 ft³/s | 104.45 ft | 19 hrs ago |
| SAN JOAQUIN R A FREMONT FORD BRIDGE CAUSGS gauge | 63°F17°C | 100 ft³/s | 58.67 ft | 19 hrs ago |
| COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge | 63°F17°C | 10 ft³/s | 5.12 ft | 20 hrs ago |
| 009N009W02F001MUSGS gauge | 63°F17°C | — | — | 20 hrs ago |
| SACRAMENTO R BL WILKINS SLOUGH NR GRIMES CAUSGS gauge | 63°F17°C | 4,370 ft³/s | 27.86 ft | 19 hrs ago |
| AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CAUSGS gauge | 63°F17°C | — | — | 19 hrs ago |
| MOJAVE R A LO NARROWS NR VICTORVILLE CAUSGS gauge | 62°F17°C | 3 ft³/s | 6.97 ft | 19 hrs ago |
| SALT SLOUGH A HWY 165 NR STEVINSON CAUSGS gauge | 62°F17°C | 84 ft³/s | 67.52 ft | 19 hrs ago |
| AMERICAN R A FAIR OAKS CAUSGS gauge | 62°F17°C | 1,530 ft³/s | 6.36 ft | 19 hrs ago |
| EEL R A FORT SEWARD CAUSGS gauge | 62°F17°C | 51 ft³/s | 7.19 ft | 19 hrs ago |
| SAN JOAQUIN R NR VERNALIS CAUSGS gauge | 62°F17°C | 2,520 ft³/s | 10.18 ft | 19 hrs ago |
| AMERICAN R BL FOLSOM DAM NR FOLSOM CAUSGS gauge | 62°F17°C | — | — | 19 hrs ago |
| ARROYO VALLE NR LIVERMORE CAUSGS gauge | 62°F17°C | 8 ft³/s | 2.90 ft | 19 hrs ago |
| RUSSIAN R A DIGGER BEND NR HEALDSBURG CAUSGS gauge | 62°F16°C | 172 ft³/s | 6.25 ft | 19 hrs ago |
| ALAMEDA C NR NILES CAUSGS gauge | 61°F16°C | 7 ft³/s | 2.50 ft | 20 hrs ago |
| RUSSIAN R A JIMTOWN CAUSGS gauge | 61°F16°C | 158 ft³/s | 4.52 ft | 20 hrs ago |
| SANTA YNEZ R A HWY 154 NR SANTA YNEZ CAUSGS gauge | 61°F16°C | 18 ft³/s | 11.09 ft | 20 hrs ago |
| SF TULE R NR RESERVATION BNDRY NR PORTERVILLE CAUSGS gauge | 61°F16°C | 8 ft³/s | 2.60 ft | 19 hrs ago |
| HILTON CYN C 0.25 MI BL BRADBURY DAM NR SANTA YNEZUSGS gauge | 61°F16°C | 6 ft³/s | 2.69 ft | 19 hrs ago |
| ARROYO DE LA LAGUNA A VERONA CAUSGS gauge | 60°F16°C | 7 ft³/s | 0.75 ft | 19 hrs ago |
| RUSSIAN R A HACIENDA BRIDGE NR GUERNEVILLE CAUSGS gauge | 60°F16°C | 164 ft³/s | 1.63 ft | 19 hrs ago |
| RUSSIAN R NR HOPLAND CAUSGS gauge | 60°F16°C | 215 ft³/s | 1.24 ft | 19 hrs ago |
| COYOTE C NR EDENVALE CAUSGS gauge | 60°F15°C | — | — | 19 hrs ago |
| DEEP C NR HESPERIA CAUSGS gauge | 60°F15°C | 4 ft³/s | 1.21 ft | 19 hrs ago |
| NF AMERICAN R A AUBURN DAM SITE NR AUBURN CAUSGS gauge | 59°F15°C | — | — | 19 hrs ago |
| SANTA YNEZ R NR SANTA YNEZ CAUSGS gauge | 59°F15°C | — | 6.52 ft | 19 hrs ago |
| NF KINGS R A 24TH AVE BR NR LEMOORE CAUSGS gauge | 59°F15°C | 0 ft³/s | 12.55 ft | 20 hrs ago |
Station links open the official monitoring page with charts and history.
About these readings
Readings come from USGS real-time monitoring stations — 106 sensors are currently reporting a water temperature in California. Each figure is a point measurement at one sensor, usually on a river or stream — it doesn’t describe a whole lake or shoreline, and coverage varies across the state. Data is provisional and can be revised by the USGS.
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Conditions are for general information only and can change quickly. Always judge the water in person and follow posted advisories and local guidance before swimming or paddling.