Portland average March sea temperature

Max: 18.2°C / 64.8°F

Avg: 17°C / 62.6°F

Min: 15.9°C / 60.7°F

These figures are calculated from several years of recorded data and are the maximum, minimum and average temperatures of all the recorded years

Average daily March sea temperatures


Monthly Portland water temperature chart

The bar chart below shows the average monthly sea temperatures at Portland over the year.

  • Jan
    17.2°C
    62.9°F
  • Feb
    17.2°C
    63°F
  • Mar
    17°C
    62.6°F
  • Apr
    16.5°C
    61.7°F
  • May
    16°C
    60.9°F
  • Jun
    15.7°C
    60.2°F
  • Jul
    15.2°C
    59.3°F
  • Aug
    14.5°C
    58.1°F
  • Sep
    14.1°C
    57.4°F
  • Oct
    14.4°C
    57.9°F
  • Nov
    15.5°C
    59.8°F
  • Dec
    16.3°C
    61.3°F