Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 5°C. Select a day from the live weather forecast for Portsmouth, New Hampshire, USA for more weather parameters.

Thursday
5th Mar
5

-3

2

3
Friday
6th Mar
1

0

0

1
Saturday
7th Mar
8

1

0

2
Sunday
8th Mar
13

3

9

4
Monday
9th Mar
15

3

12

4

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

Expect mostly cloudy with light snow in Portsmouth, New Hampshire with a maximum temperature of 5°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 2-5 cm of snow expected with 91% chance of some snow and a gentle breeze of 19 kph from the north-east.

5
°C maximum temperature
-3
°C minimum temperature
mostly cloudy with light snow
2
hours of sunshine
3
UV index (Moderate)
91
% chance of some snow
<5
cm of snow expected
1
°C wind chill
19
kph wind from NE

Portsmouth weather for Friday 6th March 2026

Expect cloudy with sleet or snow in Portsmouth, New Hampshire with a maximum temperature of 1°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 mm of sleet/snow expected with 50% chance of some sleet or snow and a gentle breeze of 17 kph from the north-east.

1
°C maximum temperature
0
°C minimum temperature
cloudy with sleet or snow
0
hours of sunshine
1
UV index (Low)
50
% chance of some sleet or snow
<20
mm of sleet/snow expected
-3
°C wind chill
17
kph wind from NE

Portsmouth weather for Saturday 7th March 2026

Expect overcast with light rain in Portsmouth, New Hampshire with a maximum temperature of 8°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 17 kph from the south-west.

8
°C maximum temperature
1
°C minimum temperature
overcast with light rain
0
hours of sunshine
2
UV index (Low)
25
% chance of some rain
<2
mm of rainfall expected
6
°C wind chill
17
kph wind from SW

Portsmouth weather for Sunday 8th 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 0-2 mm of rainfall expected with 8% chance of some rain and a gentle breeze of 16 kph from the west.

13
°C maximum temperature
3
°C minimum temperature
sunshine and showers
9
hours of sunshine
4
UV index (Moderate)
8
% chance of some rain
<2
mm of rainfall expected
13
°C wind chill
16
kph wind from W

Portsmouth weather for Monday 9th March 2026

Expect clear skies in Portsmouth, New Hampshire with a maximum temperature of 15°C, maximum UV of 4 (Moderate) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south-west.