Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 84°F. Select a day from the live weather forecast for Portsmouth, New Hampshire, USA for more weather parameters.

Thursday
16th Jul
84

66

10

7
Friday
17th Jul
77

63

12

7
Saturday
18th Jul
75

63

2

4
Sunday
19th Jul
79

66

6

7
Monday
20th Jul
81

61

10

7

5-day weather forecast updated at 04:03 on Thursday 16th July 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 16th July 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 84°F, low levels of heat & humidity, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the west.

84
°F maximum temperature
66
°F minimum temperature
scattered clouds
10
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
14
mph wind from W

Portsmouth weather for Friday 17th July 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 77°F, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the west.

77
°F maximum temperature
63
°F minimum temperature
scattered clouds
12
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
77
°F wind chill
11
mph wind from W

Portsmouth weather for Saturday 18th July 2026

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 75°F, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 79% chance of some rain and a gentle breeze of 11 mph from the south.

75
°F maximum temperature
63
°F minimum temperature
mostly cloudy with light rain
2
hours of sunshine
4
UV index (Moderate)
79
% chance of some rain
<5
mm of rainfall expected
75
°F wind chill
11
mph wind from S

Portsmouth weather for Sunday 19th July 2026

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 79°F, low levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 53% chance of some rain and a moderate breeze of 12 mph from the north-west.

79
°F maximum temperature
66
°F minimum temperature
isolated thunderstorms
6
hours of sunshine
7
UV index (High)
53
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
12
mph wind from NW

Portsmouth weather for Monday 20th July 2026

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south.