Average monthly water temperature in Portland, the United States of America

On this page you find the mean water temperature over the year in Portland (Maine), the United States of America. Take a closer look at the water temperature patterns and what they mean for swimming and recreation.

In Portland, water temperatures remain cool throughout the year. The warmest month is August, with an average water temperature of 18°C (64°F).

The coldest water temperature month is March, with an average temperature of 3°C (37°F). This temperature is not very suitable for swimming.

Portland (ME) 3-Day Forecast

10-Day Forecast

More climate data for Portland

Temperature Rainfall Sunshine Humidity Water Temp

See the full Portland climate overview or explore weather in the United States of America.

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