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

38.1°F
Clear
Clear
35.8°F
38.3°F
70%
W 3.4 mph
6.6 mph
34.8°F
26.9°F
0 in
0%
9 mi
1016 mbar
0

Five Day Weather Forecast

Moderate rain
Thu
H: 62°F
L: 36°F
Moderate rain
Fri
H: 60°F
L: 45°F
Patchy rain nearby
Sat
H: 72°F
L: 44°F
Heavy rain
Sun
H: 58°F
L: 46°F
Sunny
Mon
H: 62°F
L: 41°F

Air Quality

AQI: 1 - Good
PM2.5: 6.35 μg/m3
PM10: 6.45 μg/m3
Carbon Monoxide: 179.85 μg/m3
Nitrogen Dioxide: 8.95 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 51 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:51 AM
Sunset: 7:58 PM
Daylight: 14 hrs 14 mins
Moonrise: 12:54 AM
Moon Transit: 5:19 AM
Moonset: 9:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:49 AM - 7:19 AM
5:25 PM - 7:55 PM

Minor Periods

9:20 AM - 10:50 AM
12:24 AM - 1:54 AM

Action Rating: 3 out of 5

Frost Advisory issued May 6 at 1:23PM CDT until May 7 at 8:00AM CDT by NWS Chicago IL

Effective: Wed May 6, 2026, 1:23 PM
Expires: Wed May 6, 2026, 11:30 PM

* WHAT...Temperatures in the low to mid 30s and areas of frost. * WHERE...Portions of north central and northeast Illinois. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Frost Advisory issued May 6 at 9:01PM CDT until May 7 at 8:00AM CDT by NWS Chicago IL

Effective: Wed May 6, 2026, 9:01 PM
Expires: Thu May 7, 2026, 7:15 AM

* WHAT...Temperatures in the low to mid 30s and areas of frost. * WHERE...Portions of north central and northeast Illinois. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Frost Advisory issued May 6 at 7:27PM CDT until May 7 at 8:00AM CDT by NWS Quad Cities IA IL

Effective: Wed May 6, 2026, 7:27 PM
Expires: Thu May 7, 2026, 3:30 AM

* WHAT...Temperatures in the lower to middle 30s will result in frost formation. * WHERE...Portions of north central and northwest Illinois and east central and northeast Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.
Thursday, May 7, 2026

Weather Forecast

Moderate rain
62.4°F
36°F
48.8°F
66%
0.3 in
92%
0%
16.8 mph
6.2


Air Quality

AQI: 1 - Good
PM2.5: 7.14 μg/m3
PM10: 7.83 μg/m3
Carbon Monoxide: 163.73 μg/m3
Nitrogen Dioxide: 8.24 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 67.88 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:51 AM
Sunset: 7:58 PM
Daylight: 14 hrs 14 mins
Moonrise: 12:54 AM
Moon Transit: 5:19 AM
Moonset: 9:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:49 AM - 7:19 AM
5:25 PM - 7:55 PM

Minor Periods

9:20 AM - 10:50 AM
12:24 AM - 1:54 AM

Action Rating: 3 out of 5

Friday, May 8, 2026

Weather Forecast

Moderate rain
59.7°F
45.3°F
50.3°F
90%
0.59 in
86%
0%
9.8 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 14.31 μg/m3
PM10: 15.91 μg/m3
Carbon Monoxide: 163.89 μg/m3
Nitrogen Dioxide: 10.52 μg/m3
Sulphur Dioxide: 1.71 μg/m3
Ozone: 58.16 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 12:50 AM
Sunset: 7:59 PM
Daylight: 14 hrs 16 mins
Moonrise: 1:29 AM
Moon Transit: 6:08 AM
Moonset: 10:55 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

5:38 AM - 8:08 AM
6:13 PM - 8:43 PM

Minor Periods

10:25 AM - 11:55 AM
12:59 AM - 2:29 AM

Action Rating: 3 out of 5

Saturday, May 9, 2026

Weather Forecast

Patchy rain nearby
71.7°F
44.2°F
57.7°F
74%
0.11 in
80%
0%
17.7 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 14.12 μg/m3
PM10: 15.45 μg/m3
Carbon Monoxide: 166.97 μg/m3
Nitrogen Dioxide: 15.53 μg/m3
Sulphur Dioxide: 2.23 μg/m3
Ozone: 67.4 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:50 AM
Sunset: 8:00 PM
Daylight: 14 hrs 19 mins
Moonrise: 1:58 AM
Moon Transit: 6:55 AM
Moonset: 12:00 AM
Moon Phase: Last Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

6:25 AM - 8:55 AM
6:59 PM - 9:29 PM

Minor Periods

11:30 AM - 1:00 PM
1:28 AM - 2:58 AM

Action Rating: 2 out of 5

Sunday, May 10, 2026

Weather Forecast

Heavy rain
57.7°F
45.8°F
52.7°F
84%
0.86 in
83%
0%
19.7 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 9.89 μg/m3
PM10: 10.66 μg/m3
Carbon Monoxide: 164.54 μg/m3
Nitrogen Dioxide: 8.76 μg/m3
Sulphur Dioxide: 2.44 μg/m3
Ozone: 72.12 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:50 AM
Sunset: 8:01 PM
Daylight: 14 hrs 21 mins
Moonrise: 2:23 AM
Moon Transit: 7:40 AM
Moonset: 1:07 PM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
7:44 PM - 10:14 PM

Minor Periods

12:37 AM - 2:07 PM
1:53 AM - 3:23 AM

Action Rating: 3 out of 5

Monday, May 11, 2026

Weather Forecast

Sunny
62.4°F
40.5°F
49.2°F
66%
0 in
0%
0%
8.5 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 2.69 μg/m3
PM10: 2.82 μg/m3
Carbon Monoxide: 150.71 μg/m3
Nitrogen Dioxide: 5.73 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 66.46 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:50 AM
Sunset: 8:03 PM
Daylight: 14 hrs 23 mins
Moonrise: 2:46 AM
Moon Transit: 8:24 AM
Moonset: 2:15 PM
Moon Phase: Last Quarter
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

7:54 AM - 10:24 AM
8:28 PM - 10:58 PM

Minor Periods

1:45 PM - 3:15 PM
2:16 AM - 3:46 AM

Action Rating: 3 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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