Average data for 10 years
1 September
Sunday
+23°
+19°
2 September
Monday
+22°
+19°
3 September
Tuesday
+22°
+18°
4 September
Wednesday
+22°
+18°
5 September
Thursday
+21°
+18°
6 September
Friday
+21°
+17°
7 September
Saturday
+21°
+18°
8 September
Sunday
+21°
+17°
9 September
Monday
+20°
+17°
10 September
Tuesday
+20°
+16°
11 September
Wednesday
+20°
+17°
12 September
Thursday
+19°
+16°
13 September
Friday
+21°
+17°
14 September
Saturday
+20°
+17°
15 September
Sunday
+19°
+16°
16 September
Monday
+18°
+15°
17 September
Tuesday
+19°
+15°
18 September
Wednesday
+18°
+15°
19 September
Thursday
+18°
+15°
20 September
Friday
+19°
+15°
21 September
Saturday
+20°
+17°
22 September
Sunday
+19°
+16°
23 September
Monday
+20°
+17°
24 September
Tuesday
+18°
+16°
25 September
Wednesday
+17°
+14°
26 September
Thursday
+18°
+15°
27 September
Friday
+20°
+17°
28 September
Saturday
+17°
+16°
29 September
Sunday
+16°
+15°
30 September
Monday
+15°
+14°
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September in Portsmouth is the sunniest month of the year. In September, the weather in Portsmouth is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Portsmouth has 16 sunny, 7 rainy, and 7 partly cloudy days in September. The rains are usually heavy. September as well as August is considered the most comfortable time to visit Portsmouth.