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

75.7°F
Partly Cloudy
Partly Cloudy
67.6°F
80.4°F
93%
S 2.2 mph
2.3 mph
75.7°F
73.5°F
0 in
34%
1 mi
1013 mbar
0.8

Five Day Weather Forecast

Sunny
Sun
H: 96°F
L: 71°F
Sunny
Mon
H: 93°F
L: 75°F
Sunny
Tue
H: 94°F
L: 71°F
Sunny
Wed
H: 85°F
L: 62°F
Sunny
Thu
H: 86°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 2.9 μg/m3
PM10: 3.1 μg/m3
Carbon Monoxide: 185 μg/m3
Nitrogen Dioxide: 10.4 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 47 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:01 PM
Sunset: 8:18 PM
Daylight: 14 hrs 34 mins
Moonrise: 6:49 PM
Moon Transit: 11:07 PM
Moonset: 2:32 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

10:22 AM - 12:52 AM
12:00 AM - 12:00 AM

Minor Periods

6:19 PM - 7:49 PM
2:02 AM - 3:32 AM

Action Rating: 3 out of 5

Heat Advisory issued July 26 at 12:23AM CDT until July 27 at 9:00PM CDT by NWS Lincoln IL

Effective: Sun July 26, 2026, 12:23 AM
Expires: Sun July 26, 2026, 3:30 PM

* WHAT...Heat index values near 105. * WHERE...De Witt, Macon, Marshall, McLean, Piatt, Shelby, Woodford, and Moultrie Counties. * WHEN...From noon today to 9 PM CDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.


Heat Advisory issued July 26 at 3:39AM CDT until July 27 at 9:00PM CDT by NWS Lincoln IL

Effective: Sun July 26, 2026, 3:39 AM
Expires: Sun July 26, 2026, 3:30 PM

* WHAT...Heat index values between 105-110. * WHERE...Portions of central, east central, and southeast Illinois. * WHEN...From noon today to 9 PM CDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Sunday, July 26, 2026

Weather Forecast

Sunny
95.5°F
70.5°F
80.6°F
82%
0 in
19%
0%
11.9 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 4.8 μg/m3
PM10: 5.09 μg/m3
Carbon Monoxide: 168.29 μg/m3
Nitrogen Dioxide: 8.77 μg/m3
Sulphur Dioxide: 1.33 μg/m3
Ozone: 69.5 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:01 PM
Sunset: 8:18 PM
Daylight: 14 hrs 34 mins
Moonrise: 6:49 PM
Moon Transit: 11:07 PM
Moonset: 2:32 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

10:22 AM - 12:52 AM
12:00 AM - 12:00 AM

Minor Periods

6:19 PM - 7:49 PM
2:02 AM - 3:32 AM

Action Rating: 3 out of 5

Monday, July 27, 2026

Weather Forecast

Sunny
92.6°F
74.8°F
83.5°F
78%
0 in
8%
0%
9.2 mph
9.7


Air Quality

AQI: 1 - Good
PM2.5: 5.75 μg/m3
PM10: 6.99 μg/m3
Carbon Monoxide: 143.38 μg/m3
Nitrogen Dioxide: 7.72 μg/m3
Sulphur Dioxide: 0.99 μg/m3
Ozone: 77.13 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:01 PM
Sunset: 8:17 PM
Daylight: 14 hrs 32 mins
Moonrise: 7:30 PM
Moon Transit: 11:57 PM
Moonset: 3:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

11:14 AM - 1:44 PM
12:00 AM - 12:00 AM

Minor Periods

7:00 PM - 8:30 PM
2:58 AM - 4:28 AM

Action Rating: 3 out of 5

Tuesday, July 28, 2026

Weather Forecast

Sunny
93.6°F
71°F
83°F
79%
0 in
9%
0%
10.1 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 3.43 μg/m3
PM10: 3.67 μg/m3
Carbon Monoxide: 135.46 μg/m3
Nitrogen Dioxide: 5.63 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:01 PM
Sunset: 8:16 PM
Daylight: 14 hrs 30 mins
Moonrise: 8:05 PM
Moon Transit: 12:00 AM
Moonset: 4:30 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:03 AM - 2:33 PM

Minor Periods

7:35 PM - 9:05 PM
4:00 AM - 5:30 AM

Action Rating: 4 out of 5

Wednesday, July 29, 2026

Weather Forecast

Sunny
85.4°F
61.6°F
73.9°F
78%
0 in
9%
0%
11.2 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 3.11 μg/m3
PM10: 3.2 μg/m3
Carbon Monoxide: 137.88 μg/m3
Nitrogen Dioxide: 6.55 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 65.21 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:00 PM
Sunset: 8:15 PM
Daylight: 14 hrs 28 mins
Moonrise: 8:34 PM
Moon Transit: 12:46 AM
Moonset: 5:34 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:16 AM - 2:46 AM
12:51 AM - 3:21 PM

Minor Periods

8:04 PM - 9:34 PM
5:04 AM - 6:34 AM

Action Rating: 4 out of 5

Thursday, July 30, 2026

Weather Forecast

Sunny
86.1°F
55.2°F
72.8°F
75%
0 in
7%
0%
6 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 2.68 μg/m3
PM10: 2.89 μg/m3
Carbon Monoxide: 179.25 μg/m3
Nitrogen Dioxide: 13.94 μg/m3
Sulphur Dioxide: 1.36 μg/m3
Ozone: 38.5 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:00 PM
Sunset: 8:14 PM
Daylight: 14 hrs 26 mins
Moonrise: 8:58 PM
Moon Transit: 1:32 AM
Moonset: 6:40 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

1:02 AM - 3:32 AM
1:36 PM - 4:06 PM

Minor Periods

8:28 PM - 9:58 PM
6:10 AM - 7:40 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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