Water Temperature of the Rock River in Byron, IL

Current Water Temperature

46.2°F 7.9°C
Frigid Dangerously Cold
46.2°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Friday, November 13, 2026, 9:15 PM CST

Temperature Locations

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Local Points of Interest

River Park East; Hamas Park; Sunshine Park; Byron Forest Preserve District

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Rock River

Station Name: ROCK RIVER AT BYRON, IL
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 679 feet

Nearest Address:
State Rte 72
Byron, IL 61010
Ogle County

GPS Coordinates: 42.12218889, -89.2553639

Nearby Water Temperatures

Mississippi River, Fulton, IL (48.7 mi)
Mississippi River, Fulton, IL (48.9 mi)
Beaver Slough, Clinton, IA (52.2 mi)
Fox River, McHenry, IL (53.2 mi)
Mississippi River, Camanche, IA (56.4 mi)
Illinois River, Utica, IL (56.9 mi)
Sugar River, Verona, WI (59 mi)
Mississippi River, Bellevue, IA (60.5 mi)
Badger Mill Creek, Verona, WI (60.8 mi)
Swan Creek, Fitchburg, WI (60.9 mi)
Illinois River, Marseilles, IL (61.7 mi)
Fox River, Burlington, WI (62.5 mi)
Lake Monona, Madison, WI (65.4 mi)
Eagle Spring Lake, Mukwonago, WI (65.6 mi)
Illinois River, Seneca, IL (65.7 mi)

Weather for Byron, Illinois

Current Weather

30.4°F
Clear
Conditions: Clear
Humidity: 85%
Feels Like: 25.2°F
Wind: NNW 1.4 mph
Wind Gusts: 9.6 mph
Pressure: 30.24 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 10.4 mi
UV Index: 0

Five-Day Weather Forecast

Sunny
Sat
H: 43°F
L: 30°F
Overcast
Sun
H: 46°F
L: 31°F
Overcast
Mon
H: 51°F
L: 34°F
Overcast
Tue
H: 53°F
L: 36°F
Overcast
Wed
H: 56°F
L: 41°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
9.7 μg/m³
Good
PM10
10.1 μg/m³
Good
Ozone (O3)
40 μg/m³
Photochemical
NO2
7.5 μg/m³
Nitrogen Dioxide
SO2
0.5 μg/m³
Sulfur Dioxide
CO
136 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 50m daylight
Sunrise 6:46 AM
Solar Noon 11:41 AM
Sunset 4:37 PM
Moon
Waxing Crescent • 21%
Moonrise 11:37 AM
Transit 4:08 PM
Moonset 8:45 PM

Best Times for Fishing or Hunting

Major Periods

3:14 AM - 5:44 AM
3:38 PM - 6:08 PM

Minor Periods

11:07 AM - 12:37 PM
8:15 PM - 9:45 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 34.7°F
Average Humidity: 70%
Chance of Rain: 0%
Wind: 6.4 mph
UV Index: 3

Air Quality

EPA Index 1 • Good
PM2.5
5.9 μg/m³
Good
PM10
6.1 μg/m³
Good
Ozone (O3)
43.4 μg/m³
Photochemical
NO2
9.3 μg/m³
Nitrogen Dioxide
SO2
0.6 μg/m³
Sulfur Dioxide
CO
137.4 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 50m daylight
Sunrise 6:46 AM
Solar Noon 11:41 AM
Sunset 4:37 PM
Moon
Waxing Crescent • 21%
Moonrise 11:37 AM
Transit 4:08 PM
Moonset 8:45 PM

Best Times for Fishing or Hunting

Major Periods

3:14 AM - 5:44 AM
3:38 PM - 6:08 PM

Minor Periods

11:07 AM - 12:37 PM
8:15 PM - 9:45 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 36.1°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 3.8 mph
UV Index: 2.9

Air Quality

EPA Index 1 • Good
PM2.5
8.4 μg/m³
Good
PM10
8.7 μg/m³
Good
Ozone (O3)
30.5 μg/m³
Photochemical
NO2
20.7 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
178.3 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 48m daylight
Sunrise 6:48 AM
Solar Noon 11:41 AM
Sunset 4:36 PM
Moon
Waxing Crescent • 31%
Moonrise 12:08 PM
Transit 4:54 PM
Moonset 9:49 PM

Best Times for Fishing or Hunting

Major Periods

4:01 AM - 6:31 AM
4:24 PM - 6:54 PM

Minor Periods

11:38 AM - 1:08 PM
9:19 PM - 10:49 PM
Action Rating:
Very Good 4/5
Monday, November 16, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 40.8°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 9.6 mph
UV Index: 2.9

Air Quality

EPA Index 2 • Moderate
PM2.5
11.1 μg/m³
Good
PM10
11.4 μg/m³
Good
Ozone (O3)
38.1 μg/m³
Photochemical
NO2
13.6 μg/m³
Nitrogen Dioxide
SO2
1.2 μg/m³
Sulfur Dioxide
CO
192.3 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 46m daylight
Sunrise 6:49 AM
Solar Noon 11:41 AM
Sunset 4:35 PM
Moon
First Quarter • 42%
Moonrise 12:34 PM
Transit 5:39 PM
Moonset 10:53 PM

Best Times for Fishing or Hunting

Major Periods

4:47 AM - 7:17 AM
5:09 PM - 7:39 PM

Minor Periods

12:04 PM - 1:34 PM
10:23 PM - 11:53 PM
Action Rating:
Good Action 3/5
Tuesday, November 17, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 43°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 13.8 mph
UV Index: 2.7

Air Quality

EPA Index 2 • Moderate
PM2.5
12.4 μg/m³
Moderate
PM10
12.4 μg/m³
Good
Ozone (O3)
43.2 μg/m³
Photochemical
NO2
8.1 μg/m³
Nitrogen Dioxide
SO2
3 μg/m³
Sulfur Dioxide
CO
178.2 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 44m daylight
Sunrise 6:50 AM
Solar Noon 11:42 AM
Sunset 4:34 PM
Moon
First Quarter • 54%
Moonrise 12:56 PM
Transit 6:22 PM
Moonset 11:58 PM

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
5:52 PM - 8:22 PM

Minor Periods

12:26 PM - 1:56 PM
11:28 PM - 12:58 AM
Action Rating:
Fair Action 2/5
Wednesday, November 18, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 48.4°F
Average Humidity: 57%
Chance of Rain: 1%
Wind: 18 mph
UV Index: 2.9

Air Quality

EPA Index 2 • Moderate
PM2.5
7.9 μg/m³
Good
PM10
8 μg/m³
Good
Ozone (O3)
54.3 μg/m³
Photochemical
NO2
5.8 μg/m³
Nitrogen Dioxide
SO2
2 μg/m³
Sulfur Dioxide
CO
195.4 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 42m daylight
Sunrise 6:51 AM
Solar Noon 11:42 AM
Sunset 4:33 PM
Moon
First Quarter • 65%
Moonrise 1:17 PM
Transit 7:04 PM
Moonset 1:42 AM

Best Times for Fishing or Hunting

Major Periods

6:13 AM - 8:43 AM
6:34 PM - 9:04 PM

Minor Periods

1:12 AM - 2:42 AM
12:47 PM - 2:17 PM
Action Rating:
Fair Action 2/5
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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