Winthrop Harbor water temp
This data the coastal Winthrop Harbor water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current water temperature in Winthrop Harbor
Water temperature in Winthrop Harbor today is 69.8°F. Based on our historical data over a period of ten years, the warmest water in this day in Winthrop Harbor was recorded in 2024 and was 73.4°F, and the coldest was recorded in 2018 at 63.1°F. Water temperature in Winthrop Harbor is expected to drop to 68.2°F in the next 10 days. September average water temperature in Winthrop Harbor is 67.8°F, the minimum temperature is 61°F, and the maximum is 73.6°F.
The swimming season in Winthrop Harbor lasts from July to September. During those months, Winthrop Harbor water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Winthrop Harbor in winter reaches 37.4°F, in spring 40.5°F, in summer the average temperature rises to 66.6°F, and in autumn it is 57.9°F.
Winthrop Harbor water temperature now
| September 5, 2025 |
|---|
| today temp |
| 69.8°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 71.1°F |
Surf Forecast in Winthrop Harbor for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Winthrop Harbor. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Winthrop Harbor. Data in table shown for September 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 1' 0" | 1' 9" | 2' 4" | 2' 4" |
| 0.3 m | 0.54 m | 0.71 m | 0.7 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 2' 7" | 2' 3" | 1' 11" | 1' 3" |
| 0.78 m | 0.68 m | 0.58 m | 0.37 m |
Surf report in Winthrop Harbor
Winthrop Harbor weather forecast
Current temperature and weather
Data in a table show Winthrop Harbor temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Winthrop Harbor.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  |  |  |
| 60.6°F | 60.8°F | 57.4°F | 58.1°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 61°F | 63°F | 62.8°F | 54.1°F |
You may also be interested in other sections of our site for Winthrop Harbor: Sunrise and Sunset, Tides
Winthrop Harbor water temperature by month
These figures shows the average, minimum and maximum monthly water temperature in Winthrop Harbor. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Winthrop Harbor on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 36.7°F | 31.5°F | 42.3°F | cold |
| Water temperature in Winthrop Harbor in January | ||||
| February | 34.3°F | 29.7°F | 38.5°F | cold |
| Water temperature in Winthrop Harbor in February | ||||
| March | 35.8°F | 31.5°F | 44.2°F | cold |
| Water temperature in Winthrop Harbor in March | ||||
| April | 39.2°F | 32.7°F | 47.3°F | cold |
| Water temperature in Winthrop Harbor in April | ||||
| May | 46.4°F | 37.4°F | 57.4°F | cold |
| Water temperature in Winthrop Harbor in May | ||||
| June | 57.9°F | 47.1°F | 70°F | cold |
| Water temperature in Winthrop Harbor in June | ||||
| July | 69.4°F | 58.3°F | 77.4°F | warm |
| Water temperature in Winthrop Harbor in July | ||||
| August | 72.1°F | 63.3°F | 77°F | warm |
| Water temperature in Winthrop Harbor in August | ||||
| September | 67.8°F | 61°F | 73.6°F | cold |
| Water temperature in Winthrop Harbor in September | ||||
| October | 57.7°F | 45.3°F | 69.1°F | cold |
| Water temperature in Winthrop Harbor in October | ||||
| November | 48.2°F | 38.1°F | 57.7°F | cold |
| Water temperature in Winthrop Harbor in November | ||||
| December | 41.4°F | 34.5°F | 46.9°F | cold |
| Water temperature in Winthrop Harbor in December | ||||
Chart monthly average water temperature in Winthrop Harbor
