Measurements:
°C
°F
CURRENT WEATHER
01:28
Portsmouth
66°F
E 7 mph
Feels like: 66°F
Precip: 6%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

06.25
thu
DAY
82°F
NE 4 mph
precip
1%
NIGHT
64°F
W 3 mph
precip
30%
06.26
fri
DAY
68°F
N 7 mph
precip
39%
NIGHT
66°F
SE 4 mph
precip
14%
06.27
sat
DAY
72°F
W 9 mph
precip
14%
NIGHT
58°F
S 3 mph
precip
23%
06.28
sun
DAY
72°F
W 7 mph
precip
15%
NIGHT
60°F
E 4 mph
precip
40%
06.29
mon
DAY
78°F
W 5 mph
precip
3%
NIGHT
66°F
E 4 mph
precip
16%
06.30
tue
DAY
74°F
W 7 mph
precip
7%
NIGHT
60°F
SW 1 mph
precip
12%
07.01
wed
DAY
68°F
NW 8 mph
precip
7%
NIGHT
58°F
N 5 mph
precip
22%

Portsmouth Sea Water Temperature in June, °F

Select Year: 2026 2025 2024

The average sea surface temperature in June 2026 for Portsmouth was 15.4°F. The maximum and minimum values were 10.9°F and 18.2°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