Water Temperature of Lake Michigan Near Winthrop Harbor, IL

Current Water Temperature

45.9°F

Measurement Time: Wednesday, May 6, 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
Clear
Clear
33.8°F
37.1°F
59%
WNW 7.2 mph
13.1 mph
32.9°F
26.1°F
0 in
0%
9 mi
1015 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 58°F
L: 33°F
Patchy rain nearby
Fri
H: 58°F
L: 43°F
Patchy rain nearby
Sat
H: 70°F
L: 46°F
Patchy rain nearby
Sun
H: 52°F
L: 42°F
Partly Cloudy
Mon
H: 50°F
L: 40°F

Air Quality

PM2.5: 6.75 μg/m3
PM10: 6.75 μg/m3
Carbon Monoxide: 190.85 μg/m3
Nitrogen Dioxide: 10.75 μg/m3
Sulphur Dioxide: 2.05 μg/m3
Ozone: 40 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:47 AM
Sunset: 7:58 PM
Daylight: 14 hrs 20 mins
Moonrise: 12:55 AM
Moon Transit: 5:16 AM
Moonset: 9:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:46 AM - 7:16 AM
5:30 PM - 8:00 PM

Minor Periods

9:12 AM - 10:42 AM
12:25 AM - 1:55 AM

Action Rating: 3 out of 5

Frost Advisory issued May 6 at 1:20PM CDT until May 7 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Wed May 6, 2026, 1:20 PM
Expires: Wed May 6, 2026, 9:30 PM

* WHAT...Temperatures as low as 30 will result in frost formation. * WHERE...Portions of east central, south central, and southeast Wisconsin. * 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 6:51PM CDT until May 7 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Wed May 6, 2026, 6:51 PM
Expires: Thu May 7, 2026, 3:00 AM

* WHAT...Temperatures as low as 30 will result in frost formation. * WHERE...Portions of east central, south central, and southeast Wisconsin. * 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 7 at 12:38AM CDT until May 7 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Thu May 7, 2026, 12:38 AM
Expires: Thu May 7, 2026, 8:00 AM

* WHAT...Temperatures as low as 30 will result in frost formation. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...Until 8 AM CDT this morning. * 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 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.
Thursday, May 7, 2026

Weather Forecast

Patchy rain nearby
57.6°F
33.3°F
44.9°F
65%
0.12 in
87%
0%
8.1 mph
5.5


Air Quality

AQI: 1 - Good
PM2.5: 4.68 μg/m3
PM10: 4.79 μg/m3
Carbon Monoxide: 161.13 μg/m3
Nitrogen Dioxide: 8.03 μg/m3
Sulphur Dioxide: 1.57 μg/m3
Ozone: 63.68 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:47 AM
Sunset: 7:58 PM
Daylight: 14 hrs 20 mins
Moonrise: 12:55 AM
Moon Transit: 5:16 AM
Moonset: 9:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:46 AM - 7:16 AM
5:30 PM - 8:00 PM

Minor Periods

9:12 AM - 10:42 AM
12:25 AM - 1:55 AM

Action Rating: 3 out of 5

Friday, May 8, 2026

Weather Forecast

Patchy rain nearby
57.8°F
42.9°F
50.4°F
79%
0.02 in
84%
0%
12.5 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 10.75 μg/m3
PM10: 11.3 μg/m3
Carbon Monoxide: 202.89 μg/m3
Nitrogen Dioxide: 12.51 μg/m3
Sulphur Dioxide: 2.47 μg/m3
Ozone: 73.44 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
69.9°F
45.7°F
54.5°F
76%
0.04 in
88%
0%
17.7 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 15.17 μg/m3
PM10: 15.63 μg/m3
Carbon Monoxide: 196.42 μg/m3
Nitrogen Dioxide: 13.59 μg/m3
Sulphur Dioxide: 3.38 μg/m3
Ozone: 79.2 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

Patchy rain nearby
52.2°F
41.7°F
46.6°F
72%
0.01 in
86%
0%
8.5 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 9.09 μg/m3
PM10: 9.45 μg/m3
Carbon Monoxide: 168.71 μg/m3
Nitrogen Dioxide: 8.47 μg/m3
Sulphur Dioxide: 1.79 μg/m3
Ozone: 68.23 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

Partly Cloudy
49.5°F
39.5°F
44.1°F
72%
0 in
0%
0%
8.3 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 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

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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