Sea Temperature in Portland in December

Complete information on the sea temperature range in the Atlantic Ocean in Portland in December. Historical daily data. Climate details for December. Tips on swimming conditions and beach relaxation in Portland. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Water Temperature Range in Portland in December

37°F

MINIMUN

45°F

AVERAGE

52°F

MAXIMUM

Historical Data of Water Temperature in December in Portland

Water Temperature Chart for Atlantic Ocean in Portland in December

Sea Temperature Table in Portland in December Over the Past Years

Day	2024	2023	2022	Average
Dec 1	48°C	48°C	48°C	49°C
Dec 2	48°C	48°C	46°C	48°C
Dec 3	48°C	46°C	46°C	48°C
Dec 4	48°C	46°C	48°C	48°C
Dec 5	48°C	48°C	48°C	49°C
Dec 6	48°C	46°C	46°C	47°C
Dec 7	46°C	48°C	46°C	47°C
Dec 8	46°C	46°C	46°C	47°C
Dec 9	46°C	46°C	46°C	47°C
Dec 10	46°C	46°C	48°C	47°C
Dec 11	46°C	45°C	48°C	47°C
Dec 12	46°C	45°C	48°C	46°C
Dec 13	46°C	46°C	46°C	46°C
Dec 14	45°C	46°C	46°C	46°C
Dec 15	45°C	46°C	46°C	46°C
Dec 16	45°C	46°C	46°C	46°C
Dec 17	45°C	45°C	46°C	46°C
Dec 18	45°C	46°C	46°C	46°C
Dec 19	45°C	46°C	46°C	46°C
Dec 20	45°C	46°C	46°C	46°C
Dec 21	45°C	45°C	45°C	46°C
Dec 22	43°C	45°C	45°C	45°C
Dec 23	43°C	43°C	43°C	44°C
Dec 24	43°C	43°C	45°C	44°C
Dec 25	43°C	43°C	45°C	44°C
Dec 26	43°C	43°C	45°C	44°C
Dec 27	45°C	41°C	45°C	44°C
Dec 28	45°C	43°C	45°C	45°C
Dec 29	43°C	45°C	45°C	45°C
Dec 30	43°C	45°C	45°C	45°C

Portland Climate and Swimming Opportunities in December

46°F

Average Day Air Temperature

37°F

Average Night Air Temperature

3 in

Precipitation Amount per Month

18 days

Number of Rainy Days

7 hrs

Daylight
per Day

1 hrs

Sunshine
per Day

13 mph

Average Wind Speed

91%

Average
humidity

Portland lies within the Maine in United States. The average daytime temperature in Portland in December is 46°F (8°C), while the nighttime average is 37°F (3°C). There are typically 18 rainy days during the month, with a total precipitation of 3.4 inches (86 mm). The daylight duration in December in Portland is 7 hours, with an average of 1 hours of sunshine per day. The average wind speed in December is 14 mph (22 km/h), and the humidity level is around 91%.

The water temperature in Portland in December ranges from 43°F to 48°F (6°C to 9°C). At the beginning of the month, the average temperature is around 48°F (9°C), shifting to 46°F (8°C) by mid-December and reaching 45°F (7°C) in the last ten days. Overall, the average sea temperature in Portland for December is 46°F (8°C). Still too cold for most swimmers. Only short dips in proper gear are advisable.

Sea Temperature in December in Nearby Cities

Frequently Asked Questions About Water Temperatures in December in Portland

What is the sea temperature in Portland in December?

The water temperature in the Atlantic Ocean in Portland in December ranges from 43°F to 48°F (6°C to 9°C).

Is it possible to swim in the Atlantic Ocean in Portland in December?

The average sea temperature in Portland in December is 46°F (8°C), and the air temperature is 46°F (8°C), so still too cold for most swimmers. Only short dips in proper gear are advisable.