Portsmouth Water Temperature

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Portsmouth is a town close to Gulf of Maine. August is the month with the hottest water temperature at 64.2°F / 17.9°C. The coldest month is March with an ø water temperature of 37.8°F / 3.2°C. October is the month with the lowest precipitation of 0in / 0mm and January with the highest precipitation in a year with 1.1in / 28.2mm. The avg. air temperature is around 71.4°F / 21.9°C, July is the month with the highest temperature. January is the coolest with 25.2°F / -3.8°C average air temperature. June, July, August, September would be the best time to visit. Warm-summer humid continental climate would be the climate here.

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

°F

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

°C

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
The warmest water temperature are in August with around 64.2°F / 17.9°C. The coldest in March with an average water temperature of 37.8°F / 3.2°C.

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Portsmouth weather today & 14-day weather forecast

7-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
 Rel. Humidity
Apr. 29
Few clouds
83 °F
50°F
28 °C
10°C
2mph (3km/h)
south-southwest
0in (0mm)
0 %
56%
Apr. 30
Scattered clouds
87 °F
63°F
30 °C
17°C
2mph (4km/h)
south
0in (1mm)
30 %
62%
May. 01
Broken clouds
83 °F
64°F
28 °C
18°C
1mph (2km/h)
south-southeast
0in (2mm)
35 %
73%
May. 02
Broken clouds
85 °F
65°F
29 °C
18°C
3mph (5km/h)
south-southwest
0in (2mm)
35 %
64%
May. 03
Thunderstorm with rain
78 °F
61°F
26 °C
16°C
2mph (4km/h)
west-southwest
0in (6mm)
65 %
73%
May. 04
Broken clouds
71 °F
56°F
22 °C
14°C
3mph (5km/h)
south-southeast
0in (1mm)
30 %
65%
May. 05
Few clouds
69 °F
58°F
21 °C
14°C
3mph (5km/h)
east
0in (0mm)
0 %
67%

+9-day forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
 Rel. Humidity
May. 06
Few clouds
73 °F
58°F
23 °C
14°C
3mph (5km/h)
east-southeast
0in (0mm)
0 %
66%
May. 07
Scattered clouds
73 °F
63°F
23 °C
17°C
3mph (5km/h)
south-southeast
0in (1mm)
30 %
62%
May. 08
Light rain
71 °F
60°F
22 °C
16°C
2mph (4km/h)
south-southeast
0in (5mm)
60 %
65%
May. 09
Light shower rain
64 °F
53°F
18 °C
12°C
3mph (4km/h)
east-southeast
0in (4mm)
65 %
83%
May. 10
Overcast clouds
64 °F
56°F
18 °C
14°C
3mph (5km/h)
east-northeast
0in (0mm)
10 %
92%
May. 11
Light shower rain
65 °F
58°F
18 °C
15°C
4mph (6km/h)
east-northeast
0in (2mm)
50 %
93%
May. 12
Heavy rain
67 °F
60°F
19 °C
15°C
4mph (6km/h)
east-southeast
1in (15mm)
90 %
97%
May. 13
Overcast clouds
66 °F
58°F
19 °C
14°C
2mph (4km/h)
west-northwest
0in (1mm)
25 %
90%
May. 14
Overcast clouds
66 °F
60°F
19 °C
16°C
2mph (3km/h)
east-northeast
0in (0mm)
10 %
91%

Portsmouth weather by month / climate table

°F

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%

°C

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 month with the lowest rain of 0in / 0mm and January with the highest precipitation in a year with 1.1in / 28.2mm. The avg. temperature is around 71.4°F / 21.9°C, July is the month with the highest temperature. January is the coolest with 25.2°F / -3.8°C average temperature.

Activities & POI in Portsmouth

Type of Activity List
Attraction Wentworth-Coolidge Historic Site

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