This year's long-range forecast for Portsmouth reveals higher temperatures, peaking at 35°, indicative of a warming trend against the historical average.
Select a month and click on a day for more information:
Saturday
Aug 1
30° / 22°
Sunday
Aug 2
31° / 23°
Monday
Aug 3
29° / 22°
Tuesday
Aug 4
33° / 23°
Wednesday
Aug 5
30° / 23°
Thursday
Aug 6
34° / 24°
Friday
Aug 7
33° / 24°
Saturday
Aug 8
33° / 24°
Sunday
Aug 9
34° / 24°
Monday
Aug 10
34° / 24°
Tuesday
Aug 11
33° / 25°
Wednesday
Aug 12
35° / 25°
Thursday
Aug 13
34° / 25°
Friday
Aug 14
28° / 23°
Saturday
Aug 15
30° / 22°
Sunday
Aug 16
30° / 24°
Monday
Aug 17
30° / 25°
Tuesday
Aug 18
29° / 23°
Wednesday
Aug 19
30° / 22°
Thursday
Aug 20
29° / 22°
Friday
Aug 21
28° / 22°
Saturday
Aug 22
28° / 21°
Sunday
Aug 23
28° / 21°
Monday
Aug 24
30° / 22°
Tuesday
Aug 25
31° / 23°
Wednesday
Aug 26
32° / 22°
Thursday
Aug 27
32° / 22°
Friday
Aug 28
32° / 23°
Saturday
Aug 29
31° / 22°
Sunday
Aug 30
30° / 23°
Monday
Aug 31
29° / 22°
Portsmouth 30 days weather forecast
Check out our estimated 30 days weather forecast for Portsmouth, this data is based on the average weather in Portsmouth in the last few years.
For a more accurate and detailed forecast, check out the 14 day weather for Portsmouth next to the desired date.