World Resorts

USA

Portsmouth Weather

Portsmouth 14 Days Forecast

26.09
sat

Day

57°F

SW 24 mph

Precip.
34%

Night

55°F

SW 30 mph

Precip.
77%

27.09
sun

Day

57°F

SW 32 mph

Precip.
61%

Night

57°F

SW 22 mph

Precip.
72%

28.09
mon

Day

55°F

SW 24 mph

Precip.
69%

Night

54°F

SW 14 mph

Precip.
33%

29.09
tue

Day

57°F

SW 11 mph

Precip.
32%

Night

55°F

S 6 mph

Precip.
35%

30.09
wed

Day

64°F

NE 5 mph

Precip.
19%

Night

61°F

NE 6 mph

Precip.
30%

01.10
thu

Day

64°F

NE 10 mph

Precip.
23%

Night

63°F

E 11 mph

Precip.
28%

02.10
fri

Day

70°F

SE 14 mph

Precip.
1%

Night

54°F

SE 5 mph

Precip.
11%

03.10
sat

Day

57°F

NW 9 mph

Precip.
13%

Night

55°F

N 9 mph

Precip.
46%

04.10
sun

Day

64°F

NE 11 mph

Precip.
44%

Night

64°F

NE 9 mph

Precip.
36%

05.10
mon

Day

68°F

N 12 mph

Precip.
33%

Night

66°F

NE 17 mph

Precip.
94%

06.10
tue

Day

54°F

NE 14 mph

Precip.
16%

Night

45°F

S 9 mph

Precip.
8%

07.10
wed

Day

54°F

NE 5 mph

Precip.
3%

Night

48°F

SE 8 mph

Precip.
4%

08.10
thu

Day

55°F

W 8 mph

Precip.
14%

Night

46°F

S 5 mph

Precip.
11%

09.10
fri

Day

55°F

W 5 mph

Precip.
5%

Night

50°F

N 9 mph

Precip.
10%

sea water
temperature

Portsmouth

monthly
weather

Portsmouth

current
weather

Portsmouth

7 days
forecast

Portsmouth

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2026

2025

2024

The average sea water temperature in September of 2026 was 64.3°F. The highest and lowest sea temperatures during the month were 67.3°F and 60.6°F.

Show year:

2025

2024

2023

The average sea water temperature in October of 2025 was 58.0°F. The highest and lowest sea temperatures during the month were 63.1°F and 54.9°F.