This data the coastal Mount Sinai sea 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.
Water temperature in Mount Sinai today is 71.1°F. Based on our historical data over a period of ten years, the warmest water in this day in the Long Island Sound near Mount Sinai was recorded in 2018 and was 77.4°F, and the coldest was recorded in 2017 at 70.3°F. Sea water temperature in Mount Sinai is expected to rise to 72°F in the next 10 days. September average water temperature in Mount Sinai is 71.6°F, the minimum temperature is 66.9°F, and the maximum is 77.5°F.
The swimming season in Mount Sinai lasts from July to September. During those months, Mount Sinai water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Mount Sinai in winter reaches 41.2°F, in spring 45.7°F, in summer the average temperature rises to 70°F, and in autumn it is 64.2°F.
September 5, 2025 |
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today temp |
71.1°F |
September 4, 2025 |
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yesterday temp |
71.1°F |
The sea salinity in Mount Sinai is 27.82‰, and the average salinity of the World Ocean is 35‰.
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 Mount Sinai. 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 Mount Sinai. 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' 1" | 1' 0" | 0' 8" | 0' 4" |
0.34 m | 0.3 m | 0.2 m | 0.1 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
0' 2" | 0' 4" | 0' 11" | 1' 6" |
0.05 m | 0.09 m | 0.29 m | 0.45 m |
Data in a table show Mount Sinai temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Mount Sinai.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
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![]() | ![]() | ![]() | ![]() |
69.6°F | 69.3°F | 70°F | 71.6°F |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
![]() | ![]() | ![]() | ![]() |
79°F | 82°F | 78.6°F | 74.5°F |
You may also be interested in other sections of our site for Mount Sinai: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in Mount Sinai. 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 Mount Sinai 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 | |
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January | 40.1°F | 34.2°F | 48°F | cold |
Sea water temperature in Mount Sinai in January | ||||
February | 36.7°F | 30°F | 41.5°F | cold |
Sea water temperature in Mount Sinai in February | ||||
March | 38.5°F | 31.5°F | 48.4°F | cold |
Sea water temperature in Mount Sinai in March | ||||
April | 44.6°F | 35.8°F | 52.7°F | cold |
Sea water temperature in Mount Sinai in April | ||||
May | 54.1°F | 45.9°F | 65.3°F | cold |
Sea water temperature in Mount Sinai in May | ||||
June | 64°F | 56.3°F | 72.1°F | cold |
Sea water temperature in Mount Sinai in June | ||||
July | 72.1°F | 65.5°F | 77.7°F | warm |
Sea water temperature in Mount Sinai in July | ||||
August | 73.8°F | 68.7°F | 78.1°F | warm |
Sea water temperature in Mount Sinai in August | ||||
September | 71.6°F | 66.9°F | 77.5°F | warm |
Sea water temperature in Mount Sinai in September | ||||
October | 65.1°F | 57.7°F | 70.5°F | cold |
Sea water temperature in Mount Sinai in October | ||||
November | 55.9°F | 48.4°F | 63.9°F | cold |
Sea water temperature in Mount Sinai in November | ||||
December | 46.8°F | 39.9°F | 53.4°F | cold |
Sea water temperature in Mount Sinai in December |