Walnut Beach water temp
This data the coastal Walnut Beach ocean 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 ocean temperature in Walnut Beach
Water temperature in Walnut Beach today is 70.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Long Island Sound near Walnut Beach was recorded in 2021 and was 72.5°F, and the coldest was recorded in 2020 at 68°F. Sea water temperature in Walnut Beach is expected to drop to 68°F in the next 10 days. September average water temperature in Walnut Beach is 71.6°F, the minimum temperature is 67.1°F, and the maximum is 78.1°F.
The swimming season in Walnut Beach lasts from July to September. During those months, Walnut Beach water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Walnut Beach in winter reaches 41°F, in spring 45.5°F, in summer the average temperature rises to 70.2°F, and in autumn it is 64.2°F.
Walnut Beach water temperature now
| September 25, 2025 |
|---|
| today temp |
| 70.2°F |
| September 24, 2025 |
|---|
| yesterday temp |
| 70.3°F |
Surf Forecast in Walnut Beach 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 Walnut Beach. 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 Walnut Beach. Data in table shown for September 25, 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 |
|---|---|---|---|
| 0' 9" | 0' 10" | 0' 11" | 1' 1" |
| 0.22 m | 0.26 m | 0.27 m | 0.33 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 3" | 1' 3" | 1' 3" | 1' 5" |
| 0.37 m | 0.38 m | 0.38 m | 0.43 m |
Surf report in Walnut Beach
Walnut Beach weather forecast
Current temperature and weather
Data in a table show Walnut Beach temperature today (September 25, 2025). For more information and forecast for a few days, go to the weather forecast Walnut Beach.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 67.8°F | 67.6°F | 68.9°F | 70.5°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 72.1°F | 71.6°F | 71.4°F | 71.2°F |
You may also be interested in other sections of our site for Walnut Beach: Sunrise and Sunset, Tides
Walnut Beach water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Walnut Beach. 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 Walnut Beach 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 | 39.9°F | 34.2°F | 47.8°F | cold |
| Ocean water temperature in Walnut Beach in January | ||||
| February | 36.5°F | 30.4°F | 41.2°F | cold |
| Ocean water temperature in Walnut Beach in February | ||||
| March | 38.3°F | 31.8°F | 48.4°F | cold |
| Ocean water temperature in Walnut Beach in March | ||||
| April | 44.4°F | 35.6°F | 52.7°F | cold |
| Ocean water temperature in Walnut Beach in April | ||||
| May | 54°F | 45.1°F | 65.1°F | cold |
| Ocean water temperature in Walnut Beach in May | ||||
| June | 64°F | 55°F | 72.3°F | cold |
| Ocean water temperature in Walnut Beach in June | ||||
| July | 72.5°F | 65.5°F | 78.1°F | warm |
| Ocean water temperature in Walnut Beach in July | ||||
| August | 73.9°F | 69.1°F | 78.3°F | warm |
| Ocean water temperature in Walnut Beach in August | ||||
| September | 71.6°F | 67.1°F | 78.1°F | warm |
| Ocean water temperature in Walnut Beach in September | ||||
| October | 65.1°F | 57.7°F | 72°F | cold |
| Ocean water temperature in Walnut Beach in October | ||||
| November | 55.9°F | 48.4°F | 63.7°F | cold |
| Ocean water temperature in Walnut Beach in November | ||||
| December | 46.6°F | 39.7°F | 53.4°F | cold |
| Ocean water temperature in Walnut Beach in December | ||||
Chart monthly average water temperature in Walnut Beach
