Measurements:
°C
°F
CURRENT WEATHER
00:48
Portsmouth
52°F
SE 10 mph
Feels like: 50°F
Precip: 17%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

10.27
tue
DAY
48°F
W 4 mph
precip
2%
NIGHT
38°F
SE 6 mph
precip
13%
10.28
wed
DAY
50°F
NE 2 mph
precip
13%
NIGHT
46°F
NE 9 mph
precip
5%
10.29
thu
DAY
62°F
NE 11 mph
precip
4%
NIGHT
56°F
NE 13 mph
precip
22%
10.30
fri
DAY
66°F
SE 12 mph
precip
2%
NIGHT
48°F
E 8 mph
precip
19%
10.31
sat
DAY
56°F
SE 3 mph
precip
3%
NIGHT
42°F
E 2 mph
precip
17%
11.01
sun
DAY
56°F
N 6 mph
precip
7%
NIGHT
48°F
NE 5 mph
precip
14%
11.02
mon
DAY
58°F
N 6 mph
precip
18%
NIGHT
50°F
W 4 mph
precip
33%

Portsmouth Sea Water Temperature in October, °F

Select Year: 2026 2025 2024

The average sea surface temperature in October 2026 for Portsmouth was 13.7°F. The maximum and minimum values were 11.8°F and 16.0°F respectively.

Portsmouth on the Weather Map

Best Time to Visit Portsmouth
The most sunny months:
November 16 days
July 13 days
October 13 days
The most warm months:
July 82.8 °F
August 80.9 °F
June 76.1 °F
Warmest sea temperature:
August 67.0 °F
July 65.2 °F
September 63.8 °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
September 2 days
The most windy months:
January 9 mph
March 9 mph
November 9 mph
more details