Measurements:
°C
°F
CURRENT WEATHER
13:07
Portsmouth
58°F
NW 13 mph
Feels like: 54°F
Precip: 0%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

05.14
thu
DAY
58°F
NW 13 mph
precip
0%
NIGHT
50°F
W 14 mph
precip
100%
05.15
fri
DAY
48°F
SW 13 mph
precip
100%
NIGHT
46°F
E 5 mph
precip
0%
05.16
sat
DAY
68°F
NE 7 mph
precip
0%
NIGHT
60°F
NE 11 mph
precip
0%
05.17
sun
DAY
78°F
SE 12 mph
precip
0%
NIGHT
54°F
SW 4 mph
precip
0%
05.18
mon
DAY
66°F
NW 7 mph
precip
0%
NIGHT
56°F
N 6 mph
precip
0%
05.19
tue
DAY
86°F
NE 10 mph
precip
0%
NIGHT
72°F
NE 8 mph
precip
0%
05.20
wed
DAY
84°F
E 12 mph
precip
24%
NIGHT
64°F
E 11 mph
precip
0%

Portsmouth Sea Water Temperature in May, °F

Select Year: 2025 2024 2023

The average sea surface temperature in May 2025 for Portsmouth was 9.3°F. The maximum and minimum values were 6.2°F and 11.3°F respectively.

Portsmouth on the Weather Map

Best Time to Visit Portsmouth
The most sunny months:
November 16 days
October 14 days
September 13 days
The most warm months:
July 81.7 °F
August 80.0 °F
June 75.2 °F
Warmest sea temperature:
August 66.7 °F
July 64.8 °F
September 63.6 °F
The most cold months:
January 30.9 °F
February 32.1 °F
December 36.4 °F
The most rainy months:
July 3 days
August 2 days
October 2 days
The most windy months:
January 9 mph
March 9 mph
November 9 mph
more details