Sea Temperature

Portland Sea Temperature

(Today) May 2019

8.3°C / 47°F

Current weather

16°C / 62°F
(overcast clouds)

Partly cloudy

6 mph



The measurements for the water temperature in Portland, 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 Portland water temperature derived from many years of historical sea surface temperature data.

Maximum and minimum monthly sea temperatures in Portland
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 3.5 2.1 1.8 3.4 5.1 9.8 13.9 15.9 13.5 9.4 8.1 5.4
Max °C 6.8 5.4 4.9 7.3 11.2 15.3 18.7 19.3 18.2 16 11.4 9.4
Min °F 39.6 37.1 36.4 39.6 43.6 51.8 58.9 62 58.1 51.6 47.9 43.3
Max °F 42.9 40.4 39.5 43.5 49.7 57.3 63.7 65.4 62.8 58.2 51.2 47.3

7 day tide forecast for Portland

  • Low 6:10am
  • High 12:24pm
  • Low 6:20pm
  • High 12:33am
  • Low 6:56am
  • High 1:11pm
  • Low 7:05pm
  • High 1:16am
  • Low 7:41am
  • High 1:57pm
  • Low 7:49pm
  • High 2:00am
  • Low 8:27am
  • High 2:43pm
  • Low 8:35pm
  • High 2:45am
  • Low 9:13am
  • High 3:31pm
  • Low 9:22pm
  • High 3:32am
  • Low 10:01am
  • High 4:20pm
  • Low 10:12pm
  • High 4:22am
  • Low 10:50am
  • High 5:11pm
  • Low 11:06pm

*These tide times are estimates based on the nearest port (Portland, Maine) 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 May sea temperatures

  • Max: 11.2°C / 52.1°F
  • Avg: 8.1°C / 46.6°F
  • Min: 5.1°C / 41.1°F
Portland average sea temperature chart

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

Map showing location of Portland (43.661470, -70.255330)

Locations nearby


Whilst sea temperatures for Portland 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 Portland
Casco, Elbow, Falmouth, Falmouth Neck, Gorad Portlend, Indigreat, Machegony, Machigonne, PWM, Portland, Portland i Maine, Portlandia, Portlant, Portlend, Portlenda, Quack, The Neck, Uh-kos-is-co, bo te lan, bwrtland, portalanda, portalyanda, poteullaendeu, potorando, pwrtlnd, pwrtlnd myn, Πόρτλαντ, Горад Портленд, Портланд, Портленд, Փորթլենդ, פורטלנד, بورتلاند, ورٹلینڈ، مینے, پورتلند، مین, पोर्टलंड, পোর্টল্যান্ড, ポートランド, 波特蘭, 포틀랜드

Portland average sea temperature chart