Portsmouth Weather Year-Round — Best Time to Visit
Portsmouth, United States has mild weather year-round. The best time to visit is May (score: 81/100). Annual average high: 20.2°C, total rainfall: 1149mm.
When is the best time to visit Portsmouth?
81
May is the best month to visit Portsmouth with a travel score of 81/100 (Excellent).
Expect highs of 24.1°C, 11 rain days, and 11.1 hours of daily sunshine.
View May weather details →Travel Score by Month
57
Jan
60
Feb
66
Mar
77
Apr
81
May
81
Jun
77
Jul
79
Aug
80
Sep
79
Oct
68
Nov
60
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Portsmouth each month?
20.2°C
Avg High
11.7°C
Avg Low
1149mm
Annual Rain
How much rain does Portsmouth get?
Portsmouth receives 1149mm of rain annually. The wettest month is typically July with 128mm, while February is the driest.
What is the weather like each month in Portsmouth?
January
57
9°C
Low: 1°C
9 rain days
Mixed
February
60
11°C
Low: 2°C
9 rain days
Good
March
66
15°C
Low: 5°C
10 rain days
Good
April
77
20°C
Low: 10°C
9 rain days
Good
May
Best time to visit81
24°C
Low: 15°C
11 rain days
Excellent
June
81
28°C
Low: 20°C
11 rain days
Excellent
July
77
30°C
Low: 22°C
14 rain days
Good
August
79
29°C
Low: 22°C
12 rain days
Good
September
80
26°C
Low: 19°C
10 rain days
Excellent
October
79
21°C
Low: 13°C
7 rain days
Good
November
68
16°C
Low: 7°C
8 rain days
Good
December
60
12°C
Low: 4°C
9 rain days
Mixed
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Data based on 1994–2024 averages · Last updated: 2024-12-31