Portsmouth Water Temperature

Portsmouth is a town close to Gulf of Maine. August is the month with the highest water temperature at 64.2°F / 17.9°C.
The coldest month is March with an average water temperature of 37.8°F / 3.2°C.
October is the driest at 0in / 0mm and January the wettest month with 1.1in / 28.2mm.
With an average air temperature of 71.4°F / 21.9°C, July is the warmest month in a year. January is the coldest with 25.2°F / -3.8°C average air temperature.
The Climate is described as Warm-summer humid continental climate. Best time to Visit would be in June, July, August, September.

Portsmouth Summary

Description Value
Current water temperature 57.2 °F / 14 °C
Warmest Month Water Temperature: August with 64.2°F / 17.9°C
Coldest Month Water Temperature: March with 37.8°F / 3.2°C
Warmest Month Air Temperature: July with 71.4°F / 21.9°C
Coldest Month Air Temperature: January with 25.2°F / -3.8°C
Wettest Month: January with 28.2in / 28.2mm
Highest Humidity August with 75.4%
Lowest Humidity February with 66.3%
Best Time to Visit: June, July, August, September
Climate Classification Warm-summer humid continental climate

Portsmouth Water Temperature

Portsmouth,United States of America: The current water temperature 57.2 °F

The temperature is too cold to swim

Gulf of Maine water temperature by month

Max. Water

Temperature

(°F)

ø. Water

Temperature

(°F)

Min. Water

Temperature

(°F)

January

43.2 41.4 39.6

February

39.6 38.7 37.9

March

38.8 37.9 37.6

April

44.2 41.2 38.8
May 51.8 47.7 44.4

June

59.4 55.4 51.8

July

64.2 62.1 58.6

August

64.8 64 62.6

September

63.1 60.6 58.1

October

57.9 54.5 51.1

November

51.1 49.1 47.1

December

47.1 45.1 43.2

Portsmouth,United States of America: The current water temperature 14 °C

The temperature is too cold to swim

Gulf of Maine water temperature by month

Max. Water

Temperature

(°C)

ø. Water

Temperature

(°C)

Min. Water

Temperature

(°C)

January

6.2 5.2 4.2

February

4.2 3.7 3.3

March

3.8 3.3 3.1

April

6.8 5.1 3.8
May 11 8.7 6.9

June

15.2 13 11

July

17.9 16.7 14.8

August

18.2 17.8 17

September

17.3 15.9 14.5

October

14.4 12.5 10.6

November

10.6 9.5 8.4

December

8.4 7.3 6.2
August is the month with the warmest water temperature at 64.2°F / 17.9°C. The month with the coldest is March with an average water temperature of 37.8°F / 3.2°C.

Portsmouth weather by month

Max.

Temperature

(°F)

ø.

Temperature

(°F)

Min.

Temperature

(°F)

Precip.

(inch)

Rainy Days

(day)

Rel. Humidity

(%)

January

37.4 25.2 13.5 28.2 0.7 67.8%

February

37.8 27.1 15.6 20.5 0 66.3%

March

47.5 34 21.7 6.5 0 67.4%

April

58.8 45 32.7 14.9 4 66.6%

May

71.2 55 42.8 11.9 0.6 72.3%

June

78.4 64.4 53.4 16.3 1.2 75.2%

July

81.1 71.4 63.5 4.7 1.9 74.1%

August

79.9 70.3 61.5 4.6 0 75.4%

September

75.9 64.2 54.7 5.7 0.6 75.2%

October

64.4 52.3 40.6 0 0 73.1%

November

57 42.1 31.8 0 0 71.3%

December

43.7 32.5 23.4 5.5 0 69.5%
Max.

Temperature

(°C)

ø.

Temperature

(°C)

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(days)

Rel. Humidity

(%)

January

3 -3.8 -10.3 28.2 0.7 67.8%

February

3.2 -2.7 -9.1 20.5 0 66.3%

March

8.6 1.1 -5.7 6.5 0 67.4%

April

14.9 7.2 0.4 14.9 4 66.6%

May

21.8 12.8 6 11.9 0.6 72.3%

June

25.8 18 11.9 16.3 1.2 75.2%

July

27.3 21.9 17.5 4.7 1.9 74.1%

August

26.6 21.3 16.4 4.6 0 75.4%

September

24.4 17.9 12.6 5.7 0.6 75.2%

October

18 11.3 4.8 0 0 73.1%

November

13.9 5.6 -0.1 0 0 71.3%

December

6.5 0.3 -4.8 5.5 0 69.5%
October is the driest at 0in / 0mm and January the wettest month with 1.1in / 28.2mm. With an average temperature of 71.4°F / 21.9°C, July is the warmest month in a year. January is the coldest with 25.2°F / -3.8°C average temperature.

Activities & POI in Portsmouth

Type of Activity List
Attraction Wentworth-Coolidge Historic Site