Osterville Water Temperature

(Today) 2025

23.3°C / 74°F

The water will feel warm (balmy). Most people will be OK with just bathers / swimming costume at this temperature. If you intend to stay in the water for a while a thin shorty wetsuit will suffice.

*Live data from NANTUCKET SOUND: 24.1°C / 75.4°F

Current weather

21°C / 70°F
(clear sky)
Partly cloudy
Wind
0 mph
Humidity
77%

The measurements for the water temperature in Osterville, Massachusetts are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.

*Live data may vary from satellite readings for a number of reasons. These include local factors, depth of smapling and time of day.

Water temp by month

Monthly average max / min water temperatures

The graph below shows the range of monthly Osterville water temperature derived from many years of historical sea surface temperature data.

Osterville average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Osterville
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.9 2 1.6 3.6 7.1 11 16.1 18.5 17.2 12.7 9.6 5.1
Max °C 7.4 4.9 5.7 9.7 13.3 18.6 21.9 21.9 20.3 18.9 13.9 11.4
Min °F 39 36.7 36.5 40.9 47.3 54.8 63.3 66.7 64.2 57.3 51 43.7
Max °F 43.5 39.6 40.6 47 53.5 62.4 69.1 70.1 67.3 63.5 55.3 50

The warmest water temperature is in August with an average around 68.4°F / 20.2°C. The coldest month is February with an average water temperature of 38.1°F / 3.4°C.

7 day tide forecast for Osterville

SatSunMonTueWedThuFri
  • Low 1:09am
    (0.01m)
  • High 7:48am
    (0.74m)
  • Low 1:25pm
    (0.05m)
  • High 8:11pm
    (0.85m)
  • Low 2:11am
    (0m)
  • High 8:51am
    (0.72m)
  • Low 2:24pm
    (0.06m)
  • High 9:10pm
    (0.86m)
  • Low 3:13am
    (-0.01m)
  • High 9:55am
    (0.72m)
  • Low 3:24pm
    (0.06m)
  • High 10:11pm
    (0.87m)
  • Low 4:15am
    (-0.02m)
  • High 10:58am
    (0.73m)
  • Low 4:23pm
    (0.05m)
  • High 11:10pm
    (0.88m)
  • Low 5:13am
    (-0.04m)
  • High 11:57am
    (0.74m)
  • Low 5:20pm
    (0.04m)
  • High 12:08am
    (0.89m)
  • Low 6:07am
    (-0.05m)
  • High 12:53pm
    (0.75m)
  • Low 6:15pm
    (0.03m)
  • High 1:02am
    (0.89m)
  • Low 6:58am
    (-0.05m)
  • High 1:44pm
    (0.77m)
  • Low 7:06pm
    (0.02m)
7 day tide times for Osterville

*These tide times are estimates based on the nearest accurate location (Cotuit Highlands, Nantucket Sound, Massachusetts) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.