Weather in Portstewart in september 2025

The weather in Portstewart in september comes from statistical datas on the last years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.

Average weather throughout september

tolerable weather

Weather at 6am
54°F

Moderate rain at times

24%

Cloudy

22%

Clear/Sunny

17%

Weather at 12pm
59°F

Partly Cloudy

22%

Cloudy

21%

Clear/Sunny

15%

Weather at 6pm
58°F

Partly Cloudy

21%

Cloudy

16%

Clear/Sunny

15%

Weather at 3am
54°F

Moderate rain at times

26%

Partly Cloudy

24%

Cloudy

19%

Clear/Sunny

19%



Evolution of daily average temperature and precipitation in Portstewart in september

These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Portstewart in september.


The climate of Portstewart in september is tolerable

The climate in september in Portstewart is wet (with 4.1in of rainfall over 7 days). The weather is better from the previous month since in august it receives an average of 5.9in of precipitation over 10 days.

The climate is relatively cool there this month, but it is liveable when dressing warm. The high seasonal norm is 61°F. In the morning the temperature drops to 54°F. Thus, the mean temperature average in september in Portstewart is 58°F. Note that seasonal normals in contrast with those observed in Portstewart in september with a maximum record of 70°F in 2021 and a minimum record of 41°F in 2010. You can hope to have about 3 days with temperatures up to 65°F, or 10% of time.

On this month of september, day length in Portstewart is generally 12:44. Sunrise is at 05:59 and sets at 18:43.

With a correct climate, this month is okay (but not the best) to go in this locality.



September: another location in Northern Ireland?

If you want to go to Northern Ireland in september, there are destinations with better weather than Portstewart:

In september, Donwpatrick, Larne, Annalong, Bangor, Carrickfergus and Dundrum have good weather.

more information about North Ireland's weather in september


Seasonal average climate and temperature of Portstewart in september

Check below seasonal norms These statistics are generated from the weather statements earlier years of september.

September
Outside temperature
Average temperature 58°F
Highest temperature 61°F
Lowest temperature 54°F
Highest record temperature 70°F
(2021)
Lowest record temperature 41°F
(2010)
Number of days at +65°F 3 day(s)
(10%)
Sea temperature
Average sea temperature 58°F
Lowest sea temperature 56°F
Highest sea temperature 59°F
Wind
Wind speed 26km/h
Wind temperature 50°F
Precipitation (rainfall)
Rainfall 4.1in
Number of days with rainfall 7 day(s)
(24%)
Record daily rainfall 1.1in
(2017)
Other climate data
Humidity 90%
Visibility 8.97km
Cloud cover 58%
UV index 4
Daily sunshine hours 10
Sunrise and sunset
Time of sunrise 05:59
Time of sunset 18:43
Length of day 12:44
Our opinion about the weather in september
Our opinion at whereandwhen.net tolerable



How was the weather last september?

Here is the day by day recorded weather in Portstewart in september 2024:

01-09-2024
Overcast
58°F to 59°F
02-09-2024
Light rain
58°F to 59°F
03-09-2024
Patchy rain nearby
56°F to 58°F
04-09-2024
Light rain shower
56°F to 58°F
05-09-2024
Clear/Sunny
56°F to 58°F
06-09-2024
Clear/Sunny
59°F to 61°F
07-09-2024
Clear/Sunny
59°F to 61°F
08-09-2024
Patchy rain nearby
56°F to 58°F
09-09-2024
Partly Cloudy
56°F to 58°F
10-09-2024
Patchy rain nearby
54°F to 58°F
11-09-2024
Patchy rain nearby
52°F to 54°F
12-09-2024
Patchy rain nearby
52°F to 54°F
13-09-2024
Overcast
50°F to 54°F
14-09-2024
Cloudy
56°F to 61°F
15-09-2024
Patchy rain nearby
58°F to 59°F
16-09-2024
Clear/Sunny
54°F to 61°F
17-09-2024
Clear/Sunny
58°F to 63°F
18-09-2024
Clear/Sunny
58°F to 61°F
19-09-2024
Clear/Sunny
56°F to 61°F
20-09-2024
Clear/Sunny
58°F to 59°F
21-09-2024
Clear/Sunny
58°F to 61°F
22-09-2024
Clear/Sunny
56°F to 59°F
23-09-2024
Patchy rain nearby
54°F to 58°F
24-09-2024
Patchy rain nearby
52°F to 56°F
25-09-2024
Light rain shower
50°F to 52°F
26-09-2024
Light rain
50°F to 54°F
27-09-2024
Patchy rain nearby
52°F to 54°F
28-09-2024
Patchy rain nearby
50°F to 56°F
29-09-2024
Patchy rain nearby
52°F to 56°F
30-09-2024
Light rain
50°F to 54°F

Map: other cities in Northern Ireland in september

Cities near Portstewart:

Portrush in septembertolerable weather
Castlerock in septembertolerable weather
Coleraine in septembertolerable weather
Ballymoney in septembertolerable weather
Limavady in septembertolerable weather
Ballycastle (Causeway Coast) in septembertolerable weather
Maghera in septembertolerable weather
Derry (Londonderry) in septembertolerable weather
Glenariff in septembertolerable weather
Ballymena in septembertolerable weather
Magherafelt in septembertolerable weather
Cookstown in septembertolerable weather
North Ireland in september: See full list of cities

Click over cities on the map for information about the weather in september.

Legend: Portstewart perfect weather good tolerable bad very bad


Weather data for Portstewart in september:

Weather data for Portstewart for september are derived from an average of the weather forecast since 2009 in Portstewart. There is a margin of error and these forecasts are to be considered as general information only. The weather in Portstewart 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 Portstewart.


Weather in august in Portstewart
Weather in october in Portstewart
Change units