Sea Temperature

Portsmouth Harbor Sea Temperature

(Today) Dec 2018

7.2°C / 45°F

Current weather

-3°C / 27°F
(overcast clouds)

Partly cloudy
Wind

0 mph

Humidity

66%


The measurements for the water temperature in Portsmouth Harbor, Maine 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.

Monthly average max / min water temperatures

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

Maximum and minimum monthly sea temperatures in Portsmouth Harbor
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 3.8 2.4 2.1 3.7 5.2 10.2 14.9 16.9 14.3 9.8 8.3 5.7
Max °C 6.7 5.2 5.1 7.8 11.8 16.4 19.7 20.4 18.9 16.7 11.5 9.6
Min °F 40 37.4 37 40.3 44 52.8 60.7 63.8 59.6 52.4 48.2 43.8
Max °F 42.9 40.2 40 44.4 50.6 59 65.5 67.3 64.2 59.3 51.4 47.7

7 day tide forecast for Portsmouth Harbor

ThuFriSatSunMonTueWed
  • High 02:58am
    (7.75m)
  • Low 08:54am
    (1.54m)
  • High 03:00pm
    (8.29m)
  • Low 09:28pm
    (0.78m)
  • High 03:44am
    (7.69m)
  • Low 09:44am
    (1.65m)
  • High 03:50pm
    (8.03m)
  • Low 10:15pm
    (0.96m)
  • High 04:33am
    (7.72m)
  • Low 10:37am
    (1.66m)
  • High 04:43pm
    (7.84m)
  • Low 11:04pm
    (1.06m)
  • High 05:22am
    (7.85m)
  • Low 11:33am
    (1.53m)
  • High 05:38pm
    (7.75m)
  • Low 11:53pm
    (1.07m)
  • High 06:11am
    (8.11m)
  • Low 12:28pm
    (1.25m)
  • High 06:33pm
    (7.78m)
  • Low 12:43am
    (0.97m)
  • High 07:00am
    (8.47m)
  • Low 01:21pm
    (0.83m)
  • High 07:27pm
    (7.95m)
  • Low 01:33am
    (0.77m)
  • High 07:47am
    (8.93m)
  • Low 02:12pm
    (0.30m)
  • High 08:19pm
    (8.21m)

*These tide times are estimates based on the nearest port (Fort Point, Portsmouth Harbor) and may differ by up to half and hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.

Average December sea temperatures

  • Max: 9.6°C / 49.2°F
  • Avg: 7.6°C / 45.7°F
  • Min: 5.7°C / 42.2°F
Portsmouth Harbor average sea temperature chart

These average ocean temperatures for Portsmouth Harbor are calculated from several years of archived data.

Map showing location of Portsmouth Harbor (43.077030, -70.712830)

Locations nearby

Variations

Whilst sea temperatures for Portsmouth Harbor are as accurate as current data allows, there may be slight local and regional variations depending on conditions. Time of day and wind direction may have a temporary local effect as can water flows from neraby rivers.

Alternate names for Portsmouth Harbor

Portsmouth Harbor average sea temperature chart