Live readings · updated daily
Water temperature in California
The latest readings from USGS real-time water sensors across California, warmest first. Snapshot updated August 21, 2026.
Warmest sensor reading right now
94°F34°C
USGS gauge HOT C A FLUME NR MAMMOTH LAKES CA · as of 9 hrs ago
All reporting stations (warmest 50 of 507)
| Station | Water temp | Streamflow | Gage height | Observed |
|---|---|---|---|---|
| HOT C A FLUME NR MAMMOTH LAKES CAUSGS gauge | 94°F34°C | 40 ft³/s | 1.04 ft | 9 hrs ago |
| COLORADO RIVER ABOVE IMPERIAL DAM, AZ-CAUSGS gauge | 87°F30°C | — | — | 9 hrs ago |
| DEEP C NR HESPERIA CAUSGS gauge | 79°F26°C | 0 ft³/s | 0.75 ft | 9 hrs ago |
| SAN JOAQUIN R NR VERNALIS CAUSGS gauge | 77°F25°C | 566 ft³/s | 7.04 ft | 9 hrs ago |
| SAN JOAQUIN R NR CROWS LANDING CAUSGS gauge | 77°F25°C | 278 ft³/s | 36.65 ft | 9 hrs ago |
| MUD SLOUGH NR GUSTINE CAUSGS gauge | 77°F25°C | 7 ft³/s | 4.35 ft | 9 hrs ago |
| TUOLUMNE R A MODESTO CAUSGS gauge | 77°F25°C | 185 ft³/s | 36.61 ft | 8 hrs ago |
| SAN JOAQUIN R A FREMONT FORD BRIDGE CAUSGS gauge | 76°F25°C | 64 ft³/s | 58.25 ft | 9 hrs ago |
| SF TULE R NR RESERVATION BNDRY NR PORTERVILLE CAUSGS gauge | 76°F25°C | 7 ft³/s | 2.58 ft | 9 hrs ago |
| SANTA MARGARITA R NR TEMECULA CAUSGS gauge | 76°F24°C | 3 ft³/s | 1.61 ft | 9 hrs ago |
| SALT SLOUGH A HWY 165 NR STEVINSON CAUSGS gauge | 75°F24°C | 114 ft³/s | 67.10 ft | 9 hrs ago |
| SAN JOAQUIN R AB MERCED R NR NEWMAN CAUSGS gauge | 75°F24°C | 110 ft³/s | 48.22 ft | 9 hrs ago |
| EEL R A FORT SEWARD CAUSGS gauge | 75°F24°C | 27 ft³/s | 7.01 ft | 9 hrs ago |
| NF KINGS R A 24TH AVE BR NR LEMOORE CAUSGS gauge | 75°F24°C | 0 ft³/s | 12.63 ft | 9 hrs ago |
| SALT POND A4 NR ALVISO CAUSGS gauge | 74°F23°C | — | — | 8 hrs ago |
| TRINITY R A HOOPA CAUSGS gauge | 73°F23°C | 593 ft³/s | 11.11 ft | 9 hrs ago |
| STANISLAUS R A RIPON CAUSGS gauge | 73°F23°C | 178 ft³/s | 37.96 ft | 8 hrs ago |
| CROSS C A KANSAS AVE NR HANFORD CAUSGS gauge | 73°F23°C | 0 ft³/s | 12.64 ft | 9 hrs ago |
| KLAMATH R NR KLAMATH CAUSGS gauge | 73°F23°C | 2,280 ft³/s | 7.68 ft | 9 hrs ago |
| MOJAVE R A LO NARROWS NR VICTORVILLE CAUSGS gauge | 72°F22°C | 4 ft³/s | 7.02 ft | 8 hrs ago |
| ELEANOR C NR HETCH HETCHY CAUSGS gauge | 72°F22°C | 22 ft³/s | 10.28 ft | 8 hrs ago |
| SOUTH SAN FRANCISCO BAY AT DUMBARTON BRIDGE CAUSGS gauge | 72°F22°C | — | — | 9 hrs ago |
| SF BAY A SAN MATEO BRIDGE NR FOSTER CITY CAUSGS gauge | 72°F22°C | — | — | 9 hrs ago |
| RUSSIAN R A DIGGER BEND NR HEALDSBURG CAUSGS gauge | 71°F22°C | 100 ft³/s | 5.88 ft | 9 hrs ago |
| SALINAS R NR SANTA MARGARITA CAUSGS gauge | 71°F22°C | 0 ft³/s | 5.09 ft | 9 hrs ago |
| ARROYO DE LA LAGUNA A VERONA CAUSGS gauge | 71°F22°C | 6 ft³/s | 0.74 ft | 9 hrs ago |
| RUSSIAN R A HACIENDA BRIDGE NR GUERNEVILLE CAUSGS gauge | 71°F21°C | 101 ft³/s | 1.07 ft | 9 hrs ago |
| ALAMEDA C NR NILES CAUSGS gauge | 70°F21°C | 12 ft³/s | 2.68 ft | 9 hrs ago |
| SACRAMENTO R A FREEPORT CAUSGS gauge | 70°F21°C | 21,200 ft³/s | 105.78 ft | 9 hrs ago |
| DEER C NR VINA CAUSGS gauge | 70°F21°C | 89 ft³/s | 0.97 ft | 9 hrs ago |
| NURSE SLOUGH A BRADMOOR ISLAND NR BIRDS LANDING CAUSGS gauge | 70°F21°C | — | — | 9 hrs ago |
| COYOTE C NR MADRONE CAUSGS gauge | 70°F21°C | 11 ft³/s | 2.02 ft | 9 hrs ago |
| COYOTE C AB HWY 237 A MILPITAS CAUSGS gauge | 69°F21°C | 8 ft³/s | 5.00 ft | 9 hrs ago |
| SANTA YNEZ R A NARROWS NR LOMPOC CAUSGS gauge | 69°F21°C | 7 ft³/s | 1.74 ft | 8 hrs ago |
| ALAMEDA C A SUNOL WATER TEMPLE A SUNOL CAUSGS gauge | 69°F21°C | 15 ft³/s | 2.66 ft | 8 hrs ago |
| FIRST MALLARD BRANCH NR FAIRFIELD CAUSGS gauge | 69°F21°C | 192 ft³/s | 25.61 ft | 9 hrs ago |
| MILL C NR LOS MOLINOS CAUSGS gauge | 69°F21°C | 111 ft³/s | 2.04 ft | 8 hrs ago |
| SANTA YNEZ R A SOLVANG CAUSGS gauge | 69°F20°C | 17 ft³/s | 4.35 ft | 9 hrs ago |
| EF RUSSIAN R NR CALPELLA CAUSGS gauge | 69°F20°C | 32 ft³/s | 5.28 ft | 9 hrs ago |
| JALAMA C NR LOMPOC CAUSGS gauge | 69°F20°C | 0 ft³/s | 3.07 ft | 9 hrs ago |
| RUSSIAN R A JIMTOWN CAUSGS gauge | 69°F20°C | 104 ft³/s | 4.18 ft | 9 hrs ago |
| SACRAMENTO R BL WILKINS SLOUGH NR GRIMES CAUSGS gauge | 68°F20°C | 6,840 ft³/s | 30.73 ft | 9 hrs ago |
| CARQUINEZ STRAIT A CARQUINEZ BR NR CROCKETT CAUSGS gauge | 68°F20°C | — | — | 9 hrs ago |
| CHERRY C NR EARLY INTAKE CAUSGS gauge | 68°F20°C | 39 ft³/s | 2.04 ft | 8 hrs ago |
| SAN FRANCISCO BAY A RICHMOND-SAN RAFAEL BRIDGE CAUSGS gauge | 68°F20°C | — | — | 9 hrs ago |
| SUISUN BAY A BENICIA BRIDGE NR BENICIA CAUSGS gauge | 68°F20°C | — | — | 9 hrs ago |
| TUOLUMNE R A GRAND CYN OF TUOLUMNE AB HETCH HETCHYUSGS gauge | 68°F20°C | 32 ft³/s | 7.27 ft | 8 hrs ago |
| KLAMATH R AB FALL C NR COPCO CAUSGS gauge | 68°F20°C | — | 25.48 ft | 8 hrs ago |
| TECOLOTE C AB FOOTBRIDGE NR SAN DIEGO CAUSGS gauge | 68°F20°C | 0 ft³/s | 1.89 ft | 9 hrs ago |
| CHERRY C BL DION R HOLM PH NR MATHER CAUSGS gauge | 67°F19°C | 50 ft³/s | 6.24 ft | 9 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.