Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 29°C. Select a day from the live weather forecast for Portsmouth, New Hampshire, USA for more weather parameters.

Thursday
11th Jun
29

20

7

8
Friday
12th Jun
27

18

4

7
Saturday
13th Jun
29

18

9

9
Sunday
14th Jun
29

17

8

8
Monday
15th Jun
27

18

12

8

5-day weather forecast updated at 04:04 on Thursday 11th June 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 11th June 2026

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and a light breeze of 8 kph from the south-west.

29
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
8
UV index (Very High)
43
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
8
kph wind from SW

Portsmouth weather for Friday 12th June 2026

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 33% chance of some rain and a light breeze of 10 kph from the east.

27
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
7
UV index (High)
33
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
10
kph wind from E

Portsmouth weather for Saturday 13th June 2026

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 9% chance of some rain and a gentle breeze of 13 kph from the west.

29
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
9
UV index (Very High)
9
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from W

Portsmouth weather for Sunday 14th June 2026

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 37% chance of some rain and a gentle breeze of 17 kph from the south.

29
°C maximum temperature
17
°C minimum temperature
sunshine and showers
8
hours of sunshine
8
UV index (Very High)
37
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
17
kph wind from S

Portsmouth weather for Monday 15th June 2026

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 2-5 mm of rainfall expected with 40% chance of some rain and a gentle breeze of 15 kph from the west.