Portsmouth in september: average Weather, Temperature and Climate
Weather in Portsmouth in september 2025
The weather in Portsmouth in september comes from statistical datas on the last years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
58°F
Partly Cloudy
34% of time
30%
17%
13%
Weather at 12pm
65°F
Clear/Sunny
33% of time
32%
19%
14%
Weather at 6pm
63°F
Clear/Sunny
39% of time
32%
15%
12%
Weather at 3am
58°F
34%
30%
15%
14%
Evolution of daily average temperature and precipitation in Portsmouth in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Portsmouth in september.
The climate of Portsmouth in september is good
In september in Portsmouth, the climate is rather dry (with 2.7in of rainfall over 4 days). The weather is better from the previous month since in august it receives an average of 3.2in of rainfall over 5 days.
The climate is rather cold here september, but it is tolerable when dressing warm. Temperatures are up to 67°F. The minimum is 58°F. Thus, the mean temperature average on this month of september in Portsmouth is 61°F. These temperatures are far removed from those records observed in Portsmouth in september with a maximum record of 77°F in 2013 and a minimum record of 45°F in 2010. You can plan to have about 19 days with temperatures above 65°F, or 63% of time.
On this month of september, day length in Portsmouth is generally 12:38. The sun rises at 05:40 and sets at 18:18.
With good weather conditions, this month is a good time to go there in England (United Kingdom).
Seasonal average climate and temperature of Portsmouth in september
Check below seasonal norms These statistics are compiled from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 61°F | ||||
| Highest temperature | 67°F | ||||
| Lowest temperature | 58°F | ||||
| Highest record temperature | 77°F (2013) | ||||
| Lowest record temperature | 45°F (2010) | ||||
| Number of days at +65°F | 19 day(s) (63%) | ||||
| Sea temperature | |||||
| Average sea temperature | 64°F | ||||
| Lowest sea temperature | 62°F | ||||
| Highest sea temperature | 65°F | ||||
| Wind | |||||
| Wind speed | 23km/h | ||||
| Wind temperature | 56°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 2.7in | ||||
| Number of days with rainfall | 4 day(s) (14%) | ||||
| Record daily rainfall | 1.6in (2012) | ||||
| Other climate data | |||||
| Humidity | 87% | ||||
| Visibility | 9.55km | ||||
| Cloud cover | 40% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:40 | ||||
| Time of sunset | 18:18 | ||||
| Length of day | 12:38 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Portsmouth in september 2024:
63°F to 74°F
63°F to 67°F
59°F to 68°F
54°F to 67°F
58°F to 63°F
61°F to 63°F
59°F to 70°F
61°F to 67°F
56°F to 65°F
61°F to 65°F
49°F to 59°F
45°F to 58°F
45°F to 59°F
49°F to 61°F
52°F to 65°F
54°F to 68°F
52°F to 68°F
58°F to 74°F
59°F to 74°F
61°F to 70°F
59°F to 68°F
61°F to 67°F
58°F to 65°F
56°F to 63°F
54°F to 59°F
59°F to 61°F
49°F to 56°F
43°F to 58°F
52°F to 56°F
59°F to 61°F
Map: other cities in England in september
Cities near Portsmouth:
| Isle of Wight in september | good weather |
| Southampton in september | good weather |
| Worthing in september | good weather |
| Bournemouth in september | good weather |
| Stonehenge in september | good weather |
| Brighton in september | good weather |
| Seven Sisters in september | good weather |
| Dorset in september | good weather |
| Eastbourne in september | good weather |
| Swindon in september | good weather |
| Weymouth in september | good weather |
| Isle of Portland in september | good weather |
Click over cities on the map for information about the weather in september.
Portsmouth
perfect weather
good
tolerable
bad
very bad
Weather data for Portsmouth in september:
Weather data for Portsmouth for september are derived from an average of the weather forecast since 2009 in Portsmouth. There is a margin of error and these forecasts are to be considered as general information only. The weather in Portsmouth can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Portsmouth.