Sea Temperature

Portsmouth Harbor Sea Temperature

(Today) Oct 2018

13.9°C / 57°F

Current weather

13°C / 55°F
(mist)

Partly cloudy
Wind

9 mph

Humidity

93%


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

MonTueWedThuFriSatSun
  • High 04:23am
    (8.01m)
  • Low 10:22am
    (1.47m)
  • High 04:31pm
    (8.55m)
  • Low 11:05pm
    (0.84m)
  • High 05:19am
    (7.69m)
  • Low 11:18am
    (1.79m)
  • High 05:28pm
    (8.24m)
  • Low 12:03am
    (1.11m)
  • High 06:18am
    (7.53m)
  • Low 12:18pm
    (1.93m)
  • High 06:27pm
    (8.07m)
  • Low 01:01am
    (1.22m)
  • High 07:16am
    (7.55m)
  • Low 01:18pm
    (1.88m)
  • High 07:26pm
    (8.06m)
  • Low 01:56am
    (1.18m)
  • High 08:09am
    (7.72m)
  • Low 02:14pm
    (1.67m)
  • High 08:21pm
    (8.19m)
  • Low 02:46am
    (1.04m)
  • High 08:57am
    (8.01m)
  • Low 03:04pm
    (1.34m)
  • High 09:10pm
    (8.39m)
  • Low 03:29am
    (0.84m)
  • High 09:39am
    (8.36m)
  • Low 03:48pm
    (0.95m)
  • High 09:54pm
    (8.61m)

*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 October sea temperatures

  • Max: 16.7°C / 62°F
  • Avg: 13.2°C / 55.8°F
  • Min: 9.8°C / 49.6°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