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

61.2°F
Overcast
Overcast
61.2°F
62.5°F
70%
SSE 17.2 mph
21.5 mph
61.9°F
59.4°F
0.03 in
100%
9 mi
1008 mbar
4.4

Five Day Weather Forecast

Moderate rain
Mon
H: 70°F
L: 57°F
Patchy rain nearby
Tue
H: 62°F
L: 50°F
Patchy rain nearby
Wed
H: 60°F
L: 46°F
Moderate rain
Thu
H: 59°F
L: 42°F
Patchy rain nearby
Fri
H: 54°F
L: 39°F

Air Quality

AQI: 1 - Good
PM2.5: 9.25 μg/m3
PM10: 10.05 μg/m3
Carbon Monoxide: 170.85 μg/m3
Nitrogen Dioxide: 4.75 μg/m3
Sulphur Dioxide: 5.35 μg/m3
Ozone: 98 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

Flood Watch issued April 26 at 8:36PM CDT until April 30 at 7:00PM CDT by NWS Chicago IL

Effective: Sun April 26, 2026, 8:36 PM
Expires: Mon April 27, 2026, 2:45 PM

...The National Weather Service in Chicago IL has issued a Flood Watch for the following rivers in Illinois... Illinois River at La Salle affecting Putnam, Bureau and La Salle zones. * WHAT...Flooding is possible. * WHERE...Illinois River from Starved Rock Lock and Dam downstream to confluence with Big Bureau Creek, including the La Salle gauge. * WHEN...From late Tuesday night to Thursday evening. * IMPACTS...At 20.0 feet, agricultural areas in La Salle, Spring Valley, and Peru are inundated. * ADDITIONAL DETAILS... - At 7:45 PM CDT Sunday, the stage was 18.8 feet. - Forecast...Flood stage may be reached early Wednesday morning. - Flood stage is 20.0 feet. - http://www.weather.gov/safety/flood

A Flood Watch means water levels above flood stage are possible, but not yet certain, based upon the latest forecasts. Persons along rivers and streams in the watch area should monitor the latest forecasts and be prepared to take action should flooding develop. 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 Monday afternoon.


Flood Warning issued April 26 at 8:28PM CDT until April 29 at 7:00PM CDT by NWS Chicago IL

Effective: Sun April 26, 2026, 8:28 PM
Expires: Mon April 27, 2026, 2:30 PM

...Forecast flooding changed to Minor severity for the following rivers in Illinois... Fox River at Montgomery affecting Kane and Kendall Counties. * WHAT...Minor flooding is forecasted. * 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 8:00 PM CDT Sunday, the stage was 13.4 feet. - Forecast...The river is expected to rise to a crest of 13.5 feet early Tuesday morning. It will then fall below flood stage Tuesday evening or on Wednesday. - 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 Monday afternoon.


Flood Warning issued April 26 at 8:29PM CDT by NWS Chicago IL

Effective: Sun April 26, 2026, 8:29 PM
Expires: Mon April 27, 2026, 2:30 PM

...The Flood Warning continues for the following rivers in Illinois... Fox River at Algonquin Lock & Dam tailwater affecting Lake IL, Kane and McHenry Counties. * WHAT...Moderate flooding is occurring and is forecasted to continue. * 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 7:30 PM CDT Sunday, the stage was 11.8 feet. - Forecast...The river is expected to gradually fall over the next several days, but will remain above flood stage through this 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 Monday afternoon.


Monday, April 27, 2026

Weather Forecast

Moderate rain
70.3°F
56.7°F
61°F
82%
0.65 in
89%
0%
23.3 mph
4.9


Air Quality

AQI: 1 - Good
PM2.5: 8.06 μg/m3
PM10: 8.53 μg/m3
Carbon Monoxide: 188.69 μg/m3
Nitrogen Dioxide: 5.03 μg/m3
Sulphur Dioxide: 5.39 μg/m3
Ozone: 92.24 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
61.7°F
49.6°F
55.3°F
71%
0 in
87%
0%
17.2 mph
6.3


Air Quality

AQI: 1 - Good
PM2.5: 3.09 μg/m3
PM10: 3.27 μg/m3
Carbon Monoxide: 170.41 μg/m3
Nitrogen Dioxide: 3.61 μg/m3
Sulphur Dioxide: 1.26 μg/m3
Ozone: 84.76 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
60.1°F
45.7°F
52.6°F
62%
0.01 in
86%
0%
14.1 mph
4.8


Air Quality

AQI: 1 - Good
PM2.5: 4.02 μg/m3
PM10: 4.32 μg/m3
Carbon Monoxide: 162.97 μg/m3
Nitrogen Dioxide: 4.29 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 79.08 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

Moderate rain
59.3°F
42.2°F
51.4°F
69%
0.2 in
87%
0%
13.6 mph
6.8


Air Quality

AQI: 1 - Good
PM2.5: 5.25 μg/m3
PM10: 5.52 μg/m3
Carbon Monoxide: 162.33 μg/m3
Nitrogen Dioxide: 5.52 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 77.16 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

Friday, May 1, 2026

Weather Forecast

Patchy rain nearby
54.1°F
39.1°F
48.3°F
68%
0.05 in
89%
0%
13.6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 10.12 μg/m3
PM10: 10.43 μg/m3
Carbon Monoxide: 176.44 μg/m3
Nitrogen Dioxide: 9.78 μg/m3
Sulphur Dioxide: 3.86 μg/m3
Ozone: 67.08 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 12:51 AM
Sunset: 7:52 PM
Daylight: 14 hrs mins
Moonrise: 8:20 PM
Moon Transit: 12:23 AM
Moonset: 5:24 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:27 AM - 2:57 PM

Minor Periods

7:50 PM - 9:20 PM
4:54 AM - 6:24 AM

Action Rating: 4 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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