Live readings · updated daily
Water temperature in Illinois
The latest readings from USGS real-time water sensors across Illinois, warmest first. Snapshot updated August 21, 2026.
Warmest sensor reading right now
USGS gauge CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, IL · as of 9 hrs ago
All reporting stations (warmest 50 of 254)
| Station | Water temp | Streamflow | Gage height | Observed |
|---|---|---|---|---|
| CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, ILUSGS gauge | 84°F29°C | — | — | 9 hrs ago |
| OHIO RIVER AT OLMSTED, ILUSGS gauge | 82°F28°C | 330,000 ft³/s | 23.22 ft | 9 hrs ago |
| BIG MUDDY RIVER AT RTE 127 AT MURPHYSBORO, ILUSGS gauge | 80°F27°C | 870 ft³/s | 5.17 ft | 9 hrs ago |
| Mississippi River Pool Lock and Dam 26 at Alton,ILUSGS gauge | 79°F26°C | — | 17.49 ft | 9 hrs ago |
| MISSISSIPPI RIVER AT DAM 13 NEAR FULTON, ILUSGS gauge | 79°F26°C | — | 4.67 ft | 9 hrs ago |
| DES PLAINES RIVER AT CHANNAHON, ILUSGS gauge | 79°F26°C | — | — | 9 hrs ago |
| SUGAR CREEK NEAR CHATHAM, ILUSGS gauge | 79°F26°C | — | — | 9 hrs ago |
| HANSON GRAVEL PIT AT CULVERT NEAR MORRIS, ILUSGS gauge | 79°F26°C | — | — | 9 hrs ago |
| ILLINOIS RIVER AT FLORENCE, ILUSGS gauge | 78°F25°C | — | 24.47 ft | 9 hrs ago |
| ILLINOIS RIVER AT STARVED ROCK, ILUSGS gauge | 77°F25°C | — | — | 9 hrs ago |
| DES PLAINES RIVER AT ROCKDALE, ILUSGS gauge | 77°F25°C | — | — | 9 hrs ago |
| ILLINOIS RIVER AT HENRY, ILUSGS gauge | 77°F25°C | 25,900 ft³/s | 20.43 ft | 8 hrs ago |
| ILLINOIS RIVER AT SENECA, ILUSGS gauge | 77°F25°C | — | 22.02 ft | 9 hrs ago |
| CHICAGO S & S CANAL AT WESTERN AVE AT CHICAGO, ILUSGS gauge | 77°F25°C | — | -2.44 ft | 9 hrs ago |
| FOX RIVER NEAR MCHENRY, ILUSGS gauge | 76°F24°C | — | 4.09 ft | 9 hrs ago |
| DES PLAINES RIVER AT ROUTE 53 AT JOLIET, ILUSGS gauge | 75°F24°C | 4,130 ft³/s | 539.09 ft | 9 hrs ago |
| ROCK RIVER AT BYRON, ILUSGS gauge | 75°F24°C | 3,810 ft³/s | 5.85 ft | 9 hrs ago |
| Long Lake at BEN Dock at Long Lake, ILUSGS gauge | 75°F24°C | — | — | 2 days ago |
| KANKAKEE R AT INFLOW OF POWER PLANT NR LORENZO, ILUSGS gauge | 75°F24°C | — | 504.74 ft | 9 hrs ago |
| KANKAKEE RIVER AT CUSTER PARK, ILUSGS gauge | 74°F24°C | — | — | 9 hrs ago |
| LICK CREEK NEAR WOODSIDE, ILUSGS gauge | 74°F23°C | — | — | 9 hrs ago |
| KANKAKEE RIVER NEAR WILMINGTON, ILUSGS gauge | 74°F23°C | 12,500 ft³/s | 3.74 ft | 8 hrs ago |
| MASON TAZEWELL DRAINAGE D AT CR2350E NR TOPEKA, ILUSGS gauge | 71°F22°C | 279 ft³/s | 17.26 ft | 9 hrs ago |
| NORTH FORK SALT CREEK NEAR DE WITT, ILUSGS gauge | 69 °F21°C | 152 ft³/s | 692.35 ft | 9 hrs ago |
| SALT CREEK NEAR FARMER CITY, ILUSGS gauge | 68°F20°C | — | 692.23 ft | 9 hrs ago |
| 22N7W-29.1d4 (SH-2)USGS gauge | 63°F17°C | — | — | 9 hrs ago |
| 22N7W-29.1d3 (DP-2)USGS gauge | 57°F14°C | — | — | 9 hrs ago |
| 22N7W-28.5a (IL Tree Nursery)USGS gauge | 57°F14°C | — | — | 9 hrs ago |
| ADDISON CREEK AT BELLWOOD, ILUSGS gauge | — | 5 ft³/s | 1.22 ft | 9 hrs ago |
| APPLE RIVER NEAR HANOVER, ILUSGS gauge | — | 63 ft³/s | 4.07 ft | 9 hrs ago |
| AUX SABLE CREEK NEAR MORRIS, ILUSGS gauge | — | 145 ft³/s | 3.72 ft | 9 hrs ago |
| BEAR CREEK NEAR MARCELLINE, ILUSGS gauge | — | 53 ft³/s | 2.95 ft | 9 hrs ago |
| BIG BUREAU CREEK AT PRINCETON, ILUSGS gauge | — | 56 ft³/s | 2.98 ft | 8 hrs ago |
| BIG MUDDY RIVER AT PLUMFIELD, ILUSGS gauge | — | 186 ft³/s | 4.01 ft | 9 hrs ago |
| BIG MUDDY RIVER BELOW REND LAKE NR BENTON, ILUSGS gauge | — | 78 ft³/s | 7.93 ft | 9 hrs ago |
| BLACK SLOUGH AT CR 500N NR PHILO, ILUSGS gauge | — | 14 ft³/s | 6.94 ft | 9 hrs ago |
| BLACKBERRY CREEK NEAR MONTGOMERY, ILUSGS gauge | — | 72 ft³/s | 4.14 ft | 9 hrs ago |
| BLACKBERRY CREEK NEAR YORKVILLE, ILUSGS gauge | — | 87 ft³/s | 4.24 ft | 9 hrs ago |
| BONEYARD CREEK AT LINCOLN AVE AT URBANA, ILUSGS gauge | — | 30 ft³/s | 7.89 ft | 8 hrs ago |
| BONEYARD CREEK AT URBANA, ILUSGS gauge | — | 20 ft³/s | 11.21 ft | 9 hrs ago |
| BONEYARD CREEK BELOW 6TH STREET AT CHAMPAIGN, ILUSGS gauge | — | — | 11.94 ft | 9 hrs ago |
| BONPAS CREEK AT BROWNS, ILUSGS gauge | — | 201 ft³/s | 4.24 ft | 8 hrs ago |
| BOONE CREEK NEAR MC HENRY, ILUSGS gauge | — | 5 ft³/s | 1.03 ft | 8 hrs ago |
| BUFFALO CREEK NEAR WHEELING, ILUSGS gauge | — | 7 ft³/s | 1.79 ft | 9 hrs ago |
| BUTTERFIELD CREEK AT FLOSSMOOR, ILUSGS gauge | — | 22 ft³/s | 4.47 ft | 9 hrs ago |
| CACHE RIVER AT FORMAN, ILUSGS gauge | — | 14 ft³/s | 9.12 ft | 9 hrs ago |
| CAHOKIA CREEK AT EDWARDSVILLE, ILUSGS gauge | — | 20 ft³/s | 3.33 ft | 9 hrs ago |
| CALUMET UNION DRAINAGE CANAL NEAR MARKHAM, ILUSGS gauge | — | 9 ft³/s | 2.72 ft | 8 hrs ago |
| CASEY FORK AT MOUNT VERNON, ILUSGS gauge | — | 3 ft³/s | 1.58 ft | 9 hrs ago |
| CHANNEL LAKE NEAR ANTIOCH, ILUSGS gauge | — | — | 4.20 ft | 8 hrs ago |
Station links open the official monitoring page with charts and history.
About these readings
Readings come from USGS real-time monitoring stations — 28 sensors are currently reporting a water temperature in Illinois. 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.