Rock River water temp
This data the coastal Rock River 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 Rock River
Water temperature in Rock River today is 63.5°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Rock River was recorded in 2023 and was 69.3°F, and the coldest was recorded in 2014 at 60.3°F. Water temperature in Rock River is expected to drop to 61.7°F in the next 10 days. September average water temperature in Rock River is 61.7°F, the minimum temperature is 51.4°F, and the maximum is 69.3°F.
Throughout the year, the water temperature in Rock River does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of July, August, September, the water temperature warms up to 68°F and above. The average water temperature in Rock River in winter reaches 36.1°F, in spring 35.4°F, in summer the average temperature rises to 57.6°F, and in autumn it is 54°F.
Rock River water temperature now
| September 5, 2025 |
|---|
| today temp |
| 63.5°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 64.2°F |
Surf Forecast in Rock River 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 Rock River. 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 Rock River. 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' 6" | 1' 2" | 0' 9" | 1' 10" |
| 0.46 m | 0.35 m | 0.24 m | 0.55 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 3' 4" | 3' 1" | 2' 7" | 2' 10" |
| 1.01 m | 0.95 m | 0.8 m | 0.86 m |
Surf report in Rock River
Rock River weather forecast
Current temperature and weather
Data in a table show Rock River temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Rock River.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  | | |
| 54.3°F | 50.7°F | 52.3°F | 51.1°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 52.7°F | 52.9°F | 52.5°F | 50.5°F |
You may also be interested in other sections of our site for Rock River: Sunrise and Sunset, Tides
Rock River water temperature by month
These figures shows the average, minimum and maximum monthly water temperature in Rock River. 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 Rock River 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 | 35.4°F | 30.4°F | 39.9°F | cold |
| Water temperature in Rock River in January | ||||
| February | 33.1°F | 30.6°F | 36°F | cold |
| Water temperature in Rock River in February | ||||
| March | 33.1°F | 30.7°F | 37.6°F | cold |
| Water temperature in Rock River in March | ||||
| April | 34.5°F | 31.1°F | 40.8°F | cold |
| Water temperature in Rock River in April | ||||
| May | 38.7°F | 32.9°F | 47.8°F | cold |
| Water temperature in Rock River in May | ||||
| June | 46.4°F | 36.9°F | 61°F | cold |
| Water temperature in Rock River in June | ||||
| July | 60.3°F | 45.1°F | 71.2°F | cold |
| Water temperature in Rock River in July | ||||
| August | 65.8°F | 58.1°F | 71.8°F | cold |
| Water temperature in Rock River in August | ||||
| September | 61.7°F | 51.4°F | 69.3°F | cold |
| Water temperature in Rock River in September | ||||
| October | 54°F | 45.9°F | 63.1°F | cold |
| Water temperature in Rock River in October | ||||
| November | 46°F | 39.4°F | 56.8°F | cold |
| Water temperature in Rock River in November | ||||
| December | 39.9°F | 34.7°F | 45.5°F | cold |
| Water temperature in Rock River in December | ||||
Chart monthly average water temperature in Rock River
