Portsmouth Water Temperature

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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 /
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 1.1in / 28.2mm
Driest Month: October with 0in / 0mm
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

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Portsmouth water temperature by month

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

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.

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Portsmouth weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Dec. 22
Few clouds
37 °F
27°F
3 °C
-3°C
2mph (3km/h)
south
0in (0mm)
0 %
58%
Dec. 23
Few clouds
43 °F
26°F
6 °C
-3°C
1mph (2km/h)
northeast
0in (0mm)
0 %
70%
Dec. 24
Light shower rain
48 °F
31°F
9 °C
-1°C
1mph (1km/h)
southwest
0in (3mm)
60 %
78%
Dec. 25
Broken clouds
50 °F
37°F
10 °C
3°C
1mph (2km/h)
north-northeast
0in (0mm)
0 %
82%
Dec. 26
Broken clouds
51 °F
39°F
11 °C
4°C
2mph (3km/h)
north-northeast
0in (0mm)
0 %
83%
Dec. 27
Broken clouds
53 °F
39°F
12 °C
4°C
2mph (3km/h)
north-northeast
0in (0mm)
0 %
87%
Dec. 28
Scattered clouds
53 °F
42°F
12 °C
6°C
2mph (4km/h)
northeast
0in (0mm)
0 %
92%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Dec. 29
Scattered clouds
58 °F
48°F
15 °C
9°C
2mph (4km/h)
east-southeast
0in (0mm)
0 %
97%
Dec. 30
Overcast clouds
57 °F
47°F
14 °C
8°C
2mph (4km/h)
southwest
0in (0mm)
0 %
92%
Dec. 31
Overcast clouds
53 °F
45°F
12 °C
7°C
2mph (4km/h)
west
0in (0mm)
0 %
70%
Jan. 01
Light rain
53 °F
44°F
12 °C
7°C
3mph (5km/h)
west-southwest
0in (7mm)
80 %
69%
Jan. 02
Light rain
46 °F
41°F
8 °C
5°C
5mph (8km/h)
north-northwest
0in (7mm)
75 %
86%
Jan. 03
Scattered clouds
44 °F
41°F
7 °C
5°C
3mph (4km/h)
south
0in (0mm)
0 %
83%
Jan. 04
Overcast clouds
45 °F
42°F
7 °C
5°C
1mph (2km/h)
northwest
0in (0mm)
20 %
83%
Jan. 05
Few clouds
42 °F
37°F
6 °C
3°C
4mph (7km/h)
northwest
0in (0mm)
20 %
63%
Jan. 06
Clear Sky
43 °F
35°F
6 °C
2°C
3mph (5km/h)
north-northwest
0in (0mm)
0 %
53%

Portsmouth weather by month / climate table

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

37.4 25.2 13.5 1.1 1 67.8%

February

37.8 27.1 15.6 0.8 0 66.3%

March

47.5 34 21.7 0.3 0 67.4%

April

58.8 45 32.7 0.6 4 66.6%

May

71.2 55 42.8 0.5 1 72.3%

June

78.4 64.4 53.4 0.6 1 75.2%

July

81.1 71.4 63.5 0.2 2 74.1%

August

79.9 70.3 61.5 0.2 0 75.4%

September

75.9 64.2 54.7 0.2 1 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 0.2 0 69.5%

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

3 -3.8 -10.3 28.2 1 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 1 72.3%

June

25.8 18 11.9 16.3 1 75.2%

July

27.3 21.9 17.5 4.7 2 74.1%

August

26.6 21.3 16.4 4.6 0 75.4%

September

24.4 17.9 12.6 5.7 1 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 most draught at 0in / 0mm and January the month with the most rain around 1.1in / 28.2mm. The avg. temperature is around 71.4°F / 21.9°C, July is the hottest month in a year. January is the coolest with 25.2°F / -3.8°C avg. temperature.

Activities & POI in Portsmouth

Type of Activity List
Attraction Wentworth-Coolidge Historic Site