Water Temperature of the Illinois River in Seneca, IL

Current Water Temperature

32.0°F

Measurement Time: Friday, January 23, 2026, 8:45 AM CST

Temperature Locations

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Illinois River

Station Name: Seneca
Data Source: USGS

Elevation Above Sea Level: 499 feet

Nearest Address:
Harbor Lane
Seneca, IL 61360
La Salle County

GPS Coordinates: 41.2997, -88.6142

Nearby Water Temperatures

Illinois River, Seneca, IL (0 mi)
Illinois River, Marseilles, IL (5.5 mi)
Hanson Gravel Pit, Morris, IL (8 mi)
Kankakee River, Morris, IL (19.3 mi)
Illinois River, Utica, IL (19.4 mi)
Des Plaines River, Channahon, IL (22.2 mi)
Kankakee River, Wilmington, IL (22.4 mi)
Kankakee River, Custer Park, IL (25.5 mi)
Des Plaines River, Rockdale, IL (29.7 mi)
Des Plaines River, Joliet, IL (32 mi)
Des Plaines River, Lockport, IL (33.4 mi)
Chicago Sanitary and Ship Canal, Romeoville, IL (37.2 mi)
Illinois River, Henry, IL (40.8 mi)
Cal-Sag Channel, Blue Island, IL (54.6 mi)
Plum Creek, Dyer, IN (59 mi)

Weather for Seneca, Illinois

Current Weather

45.1°F
Clear
Clear
42.7°F
46°F
85%
ENE 4.7 mph
9.1 mph
41°F
40.7°F
0 in
0%
9 mi
1016 mbar
0

Five Day Weather Forecast

Partly Cloudy
Sun
H: 71°F
L: 44°F
Moderate rain
Mon
H: 70°F
L: 57°F
Patchy rain nearby
Tue
H: 63°F
L: 51°F
Patchy rain nearby
Wed
H: 59°F
L: 46°F
Sunny
Thu
H: 59°F
L: 42°F

Air Quality

PM2.5: 18.85 μg/m3
PM10: 18.95 μg/m3
Carbon Monoxide: 195.85 μg/m3
Nitrogen Dioxide: 9.45 μg/m3
Sulphur Dioxide: 3.85 μg/m3
Ozone: 51 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 12:52 AM
Sunset: 7:47 PM
Daylight: 13 hrs 48 mins
Moonrise: 2:56 PM
Moon Transit: 9:33 PM
Moonset: 3:37 AM
Moon Phase: First Quarter
Moon Illumination: 72.3%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
9:03 PM - 11:33 PM

Minor Periods

2:26 PM - 3:56 PM
3:07 AM - 4:37 AM

Action Rating: 2 out of 5

Flood Warning issued April 25 at 10:19AM CDT until April 29 at 7:00PM CDT by NWS Chicago IL

Effective: Sat April 25, 2026, 10:19 AM
Expires: Sun April 26, 2026, 4:30 AM

...The Flood Warning is extended for the following rivers in Illinois... Fox River at Montgomery affecting Kendall and Kane Counties. ...The Flood Warning continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting McHenry, Lake IL and Kane Counties. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater, Montgomery, Dayton...Major flooding is forecast. * WHAT...Minor flooding is occurring and is forecasted to continue. * WHERE...Fox River from Red Gate Road in St. Charles downstream to Millington, including the Montgomery gauge. * WHEN...Until Wednesday evening. * IMPACTS...At 13.5 feet, Low-lying parking lots at city hall and Boy Scout Island are threatened in St. Charles. Fox River Trail is threatened at St. Mary Park in St. Charles. * ADDITIONAL DETAILS... - At 9:00 AM CDT Saturday the stage was 13.5 feet. - Forecast...The river is expected to remain nearly steady at around 13.5 feet through at least early next week. - Flood stage is 13.5 feet. - http://www.weather.gov/safety/flood

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.


Flood Warning issued April 25 at 10:19AM CDT by NWS Chicago IL

Effective: Sat April 25, 2026, 10:19 AM
Expires: Sun April 26, 2026, 4:30 AM

...The Flood Warning is extended for the following rivers in Illinois... Fox River at Montgomery affecting Kendall and Kane Counties. ...The Flood Warning continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting McHenry, Lake IL and Kane Counties. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater, Montgomery, Dayton...Major flooding is forecast. * WHAT...Major flooding is occurring and is forecasted to fall to moderate today. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge. * WHEN...Until further notice. * IMPACTS...At 12.0 feet, structures threatened along River Street, Johnson Street, and Maiden Lane in East Dundee. North Harrison Street threatened near Riverside Park in Algonquin. Washington Street threatened in Carpentersville. Water Street, Edwards Avenue, and Elgin Avenue threatened in East Dundee. Bayview Road threatened in Elgin. Low-lying areas of Festival Park are threatened in Elgin. * ADDITIONAL DETAILS... - At 9:30 AM CDT Saturday the stage was 12.0 feet. - Forecast...The river has crested and will began to slowly fall, but will remain above flood stage through at least next week. - Flood stage is 9.5 feet. - http://www.weather.gov/safety/flood

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.
Sunday, April 26, 2026

Weather Forecast

Partly Cloudy
70.6°F
44.1°F
56.6°F
72%
0 in
0%
0%
14.1 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 12.39 μg/m3
PM10: 12.83 μg/m3
Carbon Monoxide: 209.25 μg/m3
Nitrogen Dioxide: 7.8 μg/m3
Sulphur Dioxide: 4.31 μg/m3
Ozone: 83.84 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 12:52 AM
Sunset: 7:47 PM
Daylight: 13 hrs 48 mins
Moonrise: 2:56 PM
Moon Transit: 9:33 PM
Moonset: 3:37 AM
Moon Phase: First Quarter
Moon Illumination: 72.3%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
9:03 PM - 11:33 PM

Minor Periods

2:26 PM - 3:56 PM
3:07 AM - 4:37 AM

Action Rating: 2 out of 5

Monday, April 27, 2026

Weather Forecast

Moderate rain
70.3°F
57.1°F
63.9°F
77%
0.7 in
83%
0%
22.8 mph
4.6


Air Quality

AQI: 1 - Good
PM2.5: 8.3 μg/m3
PM10: 8.6 μg/m3
Carbon Monoxide: 206.53 μg/m3
Nitrogen Dioxide: 3.87 μg/m3
Sulphur Dioxide: 5.2 μg/m3
Ozone: 101.32 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 12:52 AM
Sunset: 7:48 PM
Daylight: 13 hrs 51 mins
Moonrise: 4:02 PM
Moon Transit: 10:16 PM
Moonset: 3:59 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.8%

Best Times for Fishing or Hunting

Major Periods

9:36 AM - 12:06 AM
12:00 AM - 12:00 AM

Minor Periods

3:32 PM - 5:02 PM
3:29 AM - 4:59 AM

Action Rating: 2 out of 5

Tuesday, April 28, 2026

Weather Forecast

Patchy rain nearby
63.4°F
51.3°F
56°F
73%
0.01 in
83%
0%
19 mph
3.3


Air Quality

AQI: 1 - Good
PM2.5: 4.05 μg/m3
PM10: 4.3 μg/m3
Carbon Monoxide: 169.59 μg/m3
Nitrogen Dioxide: 3.09 μg/m3
Sulphur Dioxide: 1.48 μg/m3
Ozone: 93 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 12:51 AM
Sunset: 7:49 PM
Daylight: 13 hrs 53 mins
Moonrise: 5:06 PM
Moon Transit: 10:57 PM
Moonset: 4:19 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 89.6%

Best Times for Fishing or Hunting

Major Periods

10:18 AM - 12:48 AM
12:00 AM - 12:00 AM

Minor Periods

4:36 PM - 6:06 PM
3:49 AM - 5:19 AM

Action Rating: 2 out of 5

Wednesday, April 29, 2026

Weather Forecast

Patchy rain nearby
58.9°F
46.3°F
53°F
69%
0.03 in
87%
0%
12.8 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 7.23 μg/m3
PM10: 7.34 μg/m3
Carbon Monoxide: 223.08 μg/m3
Nitrogen Dioxide: 14.8 μg/m3
Sulphur Dioxide: 2.84 μg/m3
Ozone: 60.46 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 12:51 AM
Sunset: 7:50 PM
Daylight: 13 hrs 55 mins
Moonrise: 6:11 PM
Moon Transit: 11:40 PM
Moonset: 4:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

11:00 AM - 1:30 PM
12:00 AM - 12:00 AM

Minor Periods

5:41 PM - 7:11 PM
4:09 AM - 5:39 AM

Action Rating: 3 out of 5

Thursday, April 30, 2026

Weather Forecast

Sunny
58.7°F
42.1°F
49°F
65%
0 in
0%
0%
10.3 mph
0.2


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 12:51 AM
Sunset: 7:51 PM
Daylight: 13 hrs 58 mins
Moonrise: 7:15 PM
Moon Transit: 12:00 AM
Moonset: 5:01 AM
Moon Phase: Full
Moon Illumination: 99.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:43 AM - 2:13 PM

Minor Periods

6:45 PM - 8:15 PM
4:31 AM - 6:01 AM

Action Rating: 5 out of 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.

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