Water Temperature of Lake Michigan Near Winthrop Harbor, IL

Current Water Temperature

45.7°F

Measurement Time: Thursday, May 7, 2026, 10:40 PM CDT

Temperature Locations

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Local Points of Interest

Pleasant Prairie, WI

Lake Michigan

Station Name: Winthrop Harbor Buoy, IL
Station Type: Buoy
Data Source: National Data Buoy Center

Elevation Above Sea Level: 574 feet

Nearest Address:
Offshore
Winthrop Harbor, IL 60096
Lake County

GPS Coordinates: 42.491, -87.779

Nearby Water Temperatures

Lake Michigan, Waukegan, IL (8.5 mi)
Lake Michigan, Racine, WI (16.1 mi)
Fox River, Burlington, WI (24.2 mi)
Lake Michigan, Wilmette, IL (25.4 mi)
Fox River, McHenry, IL (26.8 mi)
Root River, Franklin, WI (27.4 mi)
Lake Michigan, Milwaukee, WI (37.3 mi)
Honey Creek, Wauwatosa, WI (39.9 mi)
Lake Michigan, Lake Michigan, MI (40.3 mi)
Eagle Spring Lake, Mukwonago, WI (41.7 mi)
Lake Michigan, Chicago, IL (42.8 mi)
Chicago River, Chicago, IL (45.4 mi)
Cal-Sag Channel, Blue Island, IL (58.2 mi)
Grand Calumet River, Chicago, IL (59.2 mi)
Indiana Harbor Canal, East Chicago, IN (60.3 mi)

Weather Near Winthrop Harbor, Illinois

Current Weather

39°F
Overcast
Overcast
34.4°F
38.2°F
96%
SW 6.3 mph
13.2 mph
34.8°F
35.7°F
0 in
100%
9 mi
1012 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Fri
H: 67°F
L: 35°F
Patchy rain nearby
Sat
H: 66°F
L: 47°F
Partly Cloudy
Sun
H: 54°F
L: 43°F
Sunny
Mon
H: 51°F
L: 41°F
Moderate rain
Tue
H: 55°F
L: 42°F

Air Quality

AQI: 1 - Good
PM2.5: 18.85 μg/m3
PM10: 19.25 μg/m3
Carbon Monoxide: 232.85 μg/m3
Nitrogen Dioxide: 25.55 μg/m3
Sulphur Dioxide: 4.05 μg/m3
Ozone: 39 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:47 AM
Sunset: 7:59 PM
Daylight: 14 hrs 22 mins
Moonrise: 1:29 AM
Moon Transit: 6:05 AM
Moonset: 10:47 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

5:35 AM - 8:05 AM
6:16 PM - 8:46 PM

Minor Periods

10:17 AM - 11:47 AM
12:59 AM - 2:29 AM

Action Rating: 3 out of 5

Frost Advisory issued May 7 at 12:48PM CDT until May 8 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu May 7, 2026, 12:48 PM
Expires: Thu May 7, 2026, 11:15 PM

* WHAT...Temperatures dropping into the lower to middle 30s will result in frost formation. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...From 1 AM to 8 AM CDT Friday. * 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 7 at 7:18PM CDT until May 8 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu May 7, 2026, 7:18 PM
Expires: Fri May 8, 2026, 3:30 AM

* WHAT...Temperatures dropping into the lower to middle 30s will result in frost formation. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...From 1 AM to 8 AM CDT Friday. * 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 7 at 10:05PM CDT until May 8 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu May 7, 2026, 10:05 PM
Expires: Fri May 8, 2026, 7:30 AM

* WHAT...Temperatures dropping into the lower to middle 30s will result in frost formation. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...Until 8 AM CDT Friday. * 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.
Friday, May 8, 2026

Weather Forecast

Patchy rain nearby
66.7°F
35.1°F
51.4°F
74%
0.03 in
86%
0%
9.4 mph
4.8


Air Quality

AQI: 2 - Moderate
PM2.5: 17.76 μg/m3
PM10: 18.53 μg/m3
Carbon Monoxide: 210.01 μg/m3
Nitrogen Dioxide: 21.99 μg/m3
Sulphur Dioxide: 3.64 μg/m3
Ozone: 60.68 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:47 AM
Sunset: 7:59 PM
Daylight: 14 hrs 22 mins
Moonrise: 1:29 AM
Moon Transit: 6:05 AM
Moonset: 10:47 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

5:35 AM - 8:05 AM
6:16 PM - 8:46 PM

Minor Periods

10:17 AM - 11:47 AM
12:59 AM - 2:29 AM

Action Rating: 3 out of 5

Saturday, May 9, 2026

Weather Forecast

Patchy rain nearby
65.7°F
47.3°F
54.4°F
76%
0.03 in
87%
0%
15 mph
5.5


Air Quality

AQI: 2 - Moderate
PM2.5: 20.41 μg/m3
PM10: 21.74 μg/m3
Carbon Monoxide: 184.69 μg/m3
Nitrogen Dioxide: 18.77 μg/m3
Sulphur Dioxide: 3.19 μg/m3
Ozone: 68.64 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:47 AM
Sunset: 8:00 PM
Daylight: 14 hrs 24 mins
Moonrise: 1:58 AM
Moon Transit: 6:51 AM
Moonset: 11:54 AM
Moon Phase: Last Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

6:21 AM - 8:51 AM
7:02 PM - 9:32 PM

Minor Periods

11:24 AM - 12:54 AM
1:28 AM - 2:58 AM

Action Rating: 2 out of 5

Sunday, May 10, 2026

Weather Forecast

Partly Cloudy
54.1°F
42.5°F
48.2°F
65%
0 in
0%
0%
8.9 mph
6.8


Air Quality

AQI: 1 - Good
PM2.5: 8.79 μg/m3
PM10: 9.37 μg/m3
Carbon Monoxide: 163.29 μg/m3
Nitrogen Dioxide: 9.26 μg/m3
Sulphur Dioxide: 1.66 μg/m3
Ozone: 76.64 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 12:47 AM
Sunset: 8:01 PM
Daylight: 14 hrs 27 mins
Moonrise: 2:22 AM
Moon Transit: 7:36 AM
Moonset: 1:01 PM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:06 AM - 9:36 AM
7:47 PM - 10:17 PM

Minor Periods

12:31 AM - 2:01 PM
1:52 AM - 3:22 AM

Action Rating: 3 out of 5

Monday, May 11, 2026

Weather Forecast

Sunny
50.8°F
40.5°F
45.3°F
68%
0 in
0%
0%
10.1 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 4.81 μg/m3
PM10: 4.91 μg/m3
Carbon Monoxide: 162.85 μg/m3
Nitrogen Dioxide: 12.47 μg/m3
Sulphur Dioxide: 2.02 μg/m3
Ozone: 60.48 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:47 AM
Sunset: 8:02 PM
Daylight: 14 hrs 29 mins
Moonrise: 2:44 AM
Moon Transit: 8:21 AM
Moonset: 2:10 PM
Moon Phase: Last Quarter
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

7:51 AM - 10:21 AM
12:00 AM - 12:00 AM

Minor Periods

1:40 PM - 3:10 PM
2:14 AM - 3:44 AM

Action Rating: 2 out of 5

Tuesday, May 12, 2026

Weather Forecast

Moderate rain
55.4°F
42°F
45.9°F
78%
0.28 in
87%
0%
17.9 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 3.06 μg/m3
PM10: 3.1 μg/m3
Carbon Monoxide: 155.57 μg/m3
Nitrogen Dioxide: 10.95 μg/m3
Sulphur Dioxide: 2.88 μg/m3
Ozone: 59.46 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:47 AM
Sunset: 8:03 PM
Daylight: 14 hrs 31 mins
Moonrise: 3:05 AM
Moon Transit: 8:41 PM
Moonset: 3:20 PM
Moon Phase: Waning Crescent
Moon Illumination: 9.3%

Best Times for Fishing or Hunting

Major Periods

8:11 PM - 10:41 PM
8:11 PM - 10:41 PM

Minor Periods

2:50 PM - 4:20 PM
2:35 AM - 4:05 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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