Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 48°F. Select a day from the live weather forecast for Portsmouth, New Hampshire, USA for more weather parameters.

Thursday
15th Jan
48

28

2

1
Friday
16th Jan
30

21

9

1
Saturday
17th Jan
37

27

1

1
Sunday
18th Jan
37

28

2

1
Monday
19th Jan
34

23

9

1

5-day weather forecast updated at 04:05 on Thursday 15th January 2026 GMT

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The 5-day weather forecast for New Hampshire (Portsmouth) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Portsmouth weather forecast by day

Below are the detailed weather forecasts for Portsmouth for the next 5 days.

Portsmouth weather for Thursday 15th January 2026

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 48°F, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 8% chance of some rain and a gentle breeze of 12 mph from the south-west.

48
°F maximum temperature
28
°F minimum temperature
mostly cloudy with light rain
2
hours of sunshine
1
UV index (Low)
8
% chance of some rain
<2
mm of rainfall expected
43
°F wind chill
12
mph wind from SW

Portsmouth weather for Friday 16th January 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 30°F, maximum UV of 1 (Low) and 9 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 16 mph from the west.

30
°F maximum temperature
21
°F minimum temperature
scattered clouds
9
hours of sunshine
1
UV index (Low)
0
cm of snow expected
19
°F wind chill
16
mph wind from W

Portsmouth weather for Saturday 17th January 2026

Expect mostly cloudy with light snow in Portsmouth, New Hampshire with a maximum temperature of 37°F, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 45% chance of some snow and a light breeze of 6 mph from the south-west.

37
°F maximum temperature
27
°F minimum temperature
mostly cloudy with light snow
1
hour of sunshine
1
UV index (Low)
45
% chance of some snow
<2
cm of snow expected
32
°F wind chill
6
mph wind from SW

Portsmouth weather for Sunday 18th January 2026

Expect overcast skies in Portsmouth, New Hampshire with a maximum temperature of 37°F, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-west.

37
°F maximum temperature
28
°F minimum temperature
overcast skies
2
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
30
°F wind chill
7
mph wind from SW

Portsmouth weather for Monday 19th January 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 34°F, maximum UV of 1 (Low) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the west.