Measurements:
°C
°F
CURRENT WEATHER
15:30
Portsmouth
100°F
SE 14 mph
Feels like: 102°F
Precip: 0%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

07.15
wed
DAY
92°F
SE 16 mph
precip
2%
NIGHT
72°F
E 6 mph
precip
2%
07.16
thu
DAY
88°F
E 12 mph
precip
3%
NIGHT
68°F
E 7 mph
precip
2%
07.17
fri
DAY
80°F
SE 10 mph
precip
1%
NIGHT
62°F
SE 3 mph
precip
3%
07.18
sat
DAY
68°F
NE 4 mph
precip
7%
NIGHT
68°F
N 6 mph
precip
55%
07.19
sun
DAY
84°F
E 18 mph
precip
13%
NIGHT
66°F
E 9 mph
precip
3%
07.20
mon
DAY
80°F
NE 5 mph
precip
1%
NIGHT
68°F
NE 8 mph
precip
10%
07.21
tue
DAY
70°F
N 9 mph
precip
76%
NIGHT
64°F
E 11 mph
precip
6%

Portsmouth Sea Water Temperature in July, °F

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Portsmouth was 18.9°F. The maximum and minimum values were 17.2°F and 21.2°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 76.1 °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