Measurements:
°C
°F
CURRENT WEATHER
00:38
Portsmouth
30°F
SE 3 mph
Feels like: 26°F
Precip: 0%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

01.09
fri
DAY
32°F
N 7 mph
precip
0%
NIGHT
42°F
NE 15 mph
precip
100%
01.10
sat
DAY
38°F
E 5 mph
precip
0%
NIGHT
34°F
W 14 mph
precip
100%
01.11
sun
DAY
32°F
S 3 mph
precip
0%
NIGHT
30°F
E 17 mph
precip
0%
01.12
mon
DAY
28°F
E 16 mph
precip
0%
NIGHT
28°F
NE 9 mph
precip
0%
01.13
tue
DAY
36°F
NE 11 mph
precip
0%
NIGHT
34°F
NE 12 mph
precip
0%
01.14
wed
DAY
40°F
NE 11 mph
precip
0%
NIGHT
32°F
E 10 mph
precip
0%
01.15
thu
DAY
22°F
S 7 mph
precip
0%
NIGHT
18°F
S 7 mph
precip
0%

Portsmouth Sea Water Temperature in January, °F

Select Year: 2025 2024 2023

The average sea surface temperature in January 2025 for Portsmouth was 5.0°F. The maximum and minimum values were 4.1°F and 6.0°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 31.4 °F
February 32.4 °F
December 36.4 °F
The most rainy months:
July 3 days
April 3 days
August 2 days
The most windy months:
March 9 mph
January 9 mph
February 9 mph
more details