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Northern Ireland (Belfast)
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Weather in Northern Ireland for September 2025

Your guide to Northern Ireland weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Northern Ireland is slightly cooler than the historical average by -1.4 °C.

  • The forecast for the next days in Northern Ireland predicts temperatures to be around 14 °C, close to the historical average.

  • In general, the average temperature in Northern Ireland at the beginning of September is 17.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 14.9 °C by the end of September.

    • Rain 🌧️

  • The climate of Northern Ireland in September is notably wet, with an average of 14 rainy days, and a total of 235.5 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/7°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Northern Ireland Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
16°
2
Light rain shower
18°
3
Light rain shower
16°
4
Sunny
17°
5
Partly cloudy
18°
6
Partly cloudy
20°
7
Patchy rain possible
20°
8
Partly cloudy
19°
9
Patchy rain possible
18°
10
Moderate or heavy rain shower
17°
11
Light rain shower
14°
12
Light rain shower
14°
13
Overcast
14°
14
Overcast
16°
15
Moderate rain
14°
16
Cloudy
16°
17
Light rain
17°
18
Patchy rain possible
16°
19
Patchy rain possible
16°
20
Moderate rain
12°
21
Heavy rain
11°
22
Partly cloudy
11°
23
Patchy rain possible
13°
24
Sunny
14°
25
Partly cloudy
14°
26
Sunny
14°
27
Sunny
15°
28
Sunny
16°
29
Sunny
16°
30
Partly cloudy
15°

What’s the Weather Like in Northern Ireland This September?

Discover the average temperatures and weather trends across Northern Ireland’s cities this September.
Light rain showerBelfast18 °C / 7 °CPatchy rain possibleBangor15 °C / 11 °CLight rain showerDerry18 °C / 6 °CPatchy rain possibleLisburn16 °C / 9 °CPatchy rain possibleNewtownabbey16 °C / 9 °CPatchy rain possibleCraigavon16 °C / 9 °CPatchy rain possiblePortrush14 °C / 10 °CMore Locations

Temperatures trend during September in Northern Ireland

See the weather trend as well as the moving average line

September weather in Northern Ireland day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 1.2 mm 4
2 Sept. Light rain shower
Light rain shower
 18° /9° 3.7 mm 4
3 Sept. Light rain shower
Light rain shower
 16° /9° 6 mm 4
4 Sept. Sunny
Sunny
 17° /8° 1.9 mm 4
5 Sept. Partly cloudy
Partly cloudy
 18° /9° 0 mm 5
6 Sept. Partly cloudy
Partly cloudy
 20° /11° 0 mm 5
7 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 2.7 mm 4
8 Sept. Partly cloudy
Partly cloudy
 19° /9° 0.8 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 18° /10° 0.8 mm 4
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /10° 8.2 mm 4
11 Sept. Light rain shower
Light rain shower
 14° /8° 3.4 mm 3
12 Sept. Light rain shower
Light rain shower
 14° /6° 1.2 mm 4
13 Sept. Overcast
Overcast
 14° /5° 1.5 mm 3
14 Sept. Overcast
Overcast
 16° /8° 3.3 mm 4
15 Sept. Moderate rain
Moderate rain
 14° /9° 8.6 mm 3
16 Sept. Cloudy
Cloudy
 16° /7° 0.1 mm 4
17 Sept. Light rain
Light rain
 17° /10° 8.4 mm 4
18 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 1.2 mm 0.3
19 Sept. Patchy rain possible
Patchy rain possible
 16° /9° 0.5 mm 0.6
20 Sept. Moderate rain
Moderate rain
 12° /8° 17 mm 0.2
21 Sept. Heavy rain
Heavy rain
 11° /6° 48.1 mm 0.2
22 Sept. Partly cloudy
Partly cloudy
 11° /6° 0 mm 0.6
23 Sept. Patchy rain possible
Patchy rain possible
 13° /6° 0.3 mm 3
24 Sept. Sunny
Sunny
 14° /5° 0 mm 3
25 Sept. Partly cloudy
Partly cloudy
 14° /6° 0 mm 3
26 Sept. Sunny
Sunny
 14° /6° 0 mm 3
27 Sept. Sunny
Sunny
 15° /7° 0 mm 4
28 Sept. Sunny
Sunny
 16° /7° 0 mm 4
29 Sept. Sunny
Sunny
 16° /8° 0 mm 4
30 Sept. Partly cloudy
Partly cloudy
 15° /9° 0 mm 4
Next
Important Notice
Our weather forecast for Northern Ireland in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Northern Ireland forecast closer to your planned date for the most up-to-date weather information.
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Northern Ireland in September - FAQ

What are the expected maximum and minimum temperatures in Northern Ireland during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Northern Ireland during September?
Significant rainfall exceeding 235.5 mm is expected in Northern Ireland during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Northern Ireland during September?
The average wind speed in Northern Ireland during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Northern Ireland

Explore the daily rainfall trends and prepare for Northern Irelands September weather 💧
Counties in Northern Ireland
Select a county for an accurate weather forecast
Antrim and NewtownabbeyArds and North DownArmagh City Banbridge and CraigavonCauseway Coast and GlensCity of BelfastDerry City and StrabaneLisburn and Castlereagh
Top locations in Northern Ireland
Select a location for an accurate weather forecast
BangorBelfastCraigavonDerryLisburnNewtownabbeyPortrush
More Locations

Quick links

More Northern Ireland weather pages
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Location coordinates Where is Northern Ireland?

Get accurate weather forecasts for Northern Ireland, located at latitude 54.597 and longitude -5.925. Stay updated with localized weather information tailored for Northern Ireland.

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