Measurements:
°C
°F
CURRENT WEATHER
19:52
Portsmouth
52°F
SE 19 mph
Feels like: 46°F
Precip: 2%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

10.05
mon
DAY
66°F
E 14 mph
precip
26%
NIGHT
46°F
SE 17 mph
precip
4%
10.06
tue
DAY
52°F
SE 20 mph
precip
2%
NIGHT
42°F
E 8 mph
precip
4%
10.07
wed
DAY
60°F
N 9 mph
precip
1%
NIGHT
56°F
NE 13 mph
precip
16%
10.08
thu
DAY
70°F
NE 13 mph
precip
3%
NIGHT
54°F
E 10 mph
precip
5%
10.09
fri
DAY
60°F
E 16 mph
precip
1%
NIGHT
50°F
NE 11 mph
precip
5%
10.10
sat
DAY
54°F
SE 13 mph
precip
1%
NIGHT
46°F
W 4 mph
precip
13%
10.11
sun
DAY
60°F
NE 12 mph
precip
13%
NIGHT
60°F
NE 11 mph
precip
53%

Portsmouth Sea Water Temperature in October, °F

Select Year: 2025 2024 2023

The average sea surface temperature in October 2025 for Portsmouth was 14.5°F. The maximum and minimum values were 12.7°F and 17.3°F respectively.

Portsmouth on the Weather Map

Best Time to Visit Portsmouth
The most sunny months:
November 16 days
October 14 days
July 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