Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 12°C. Select a day from the live weather forecast for Portsmouth, New Hampshire, USA for more weather parameters.

Monday
16th Mar
12

3

0

1
Tuesday
17th Mar
13

-3

9

4
Wednesday
18th Mar
2

-5

8

4
Thursday
19th Mar
5

-2

10

3
Friday
20th Mar
10

0

4

4

5-day weather forecast updated at 04:03 on Monday 16th March 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 Monday 16th March 2026

Expect cloudy with some rain in Portsmouth, New Hampshire with a maximum temperature of 12°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 99% chance of some rain and a fresh breeze of 29 kph from the south.

12
°C maximum temperature
3
°C minimum temperature
cloudy with some rain
0
hours of sunshine
1
UV index (Low)
99
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
29
kph wind from S

Portsmouth weather for Tuesday 17th March 2026

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 13°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 5-10 mm of rainfall expected with 18% chance of some rain and a fresh breeze of 31 kph from the west.

13
°C maximum temperature
-3
°C minimum temperature
sunshine and showers
9
hours of sunshine
4
UV index (Moderate)
18
% chance of some rain
<10
mm of rainfall expected
13
°C wind chill
31
kph wind from W

Portsmouth weather for Wednesday 18th March 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 2°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the west.

2
°C maximum temperature
-5
°C minimum temperature
scattered clouds
8
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
-3
°C wind chill
18
kph wind from W

Portsmouth weather for Thursday 19th March 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 5°C, maximum UV of 3 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

5
°C maximum temperature
-2
°C minimum temperature
scattered clouds
10
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
2
°C wind chill
14
kph wind from S

Portsmouth weather for Friday 20th March 2026

Expect broken clouds in Portsmouth, New Hampshire with a maximum temperature of 10°C, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the west.