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Northern Ireland (Belfast)
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Weather in Northern Ireland for September 2026

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

    Temperatures

  • Until now, September 2026 in Northern Ireland has been nearly identical to the historical average, with a temperature of 16.7 °C (showing only a slight deviation of 0.1 °C).

  • The forecast for the next days in Northern Ireland predicts temperatures to be around 18 °C, close to the historical average.

  • In general, the average temperature in Northern Ireland at the beginning of September is 18 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 18.4 °C by the end of September.

    • Rain 🌧️

  • Northern Ireland experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 109.1 mm.

    • More

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

Average dry days
8
Dry days
Average rainy days
22
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/8°
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
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
17°
2
Light rain shower
18°
3
Light rain shower
17°
4
Patchy rain possible
17°
5
Overcast
18°
6
Partly cloudy
20°
7
Patchy rain possible
19°
8
Partly cloudy
18°
9
Overcast
17°
10
Moderate or heavy rain shower
17°
11
Light rain shower
15°
12
Light rain shower
15°
13
Overcast
15°
14
Overcast
17°
15
Moderate rain
14°
16
Cloudy
16°
17
Light rain
16°
18
Patchy rain possible
16°
19
Light rain
16°
20
Sunny
15°
21
Sunny
22°
22
Overcast
18°
23
Patchy rain possible
14°
24
Overcast
16°
25
Partly cloudy
18°
26
Fog
17°
27
Overcast
16°
28
Sunny
21°
29
Sunny
19°
30
Sunny
22°

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

Discover the average temperatures and weather trends across Northern Ireland’s cities this September.
Patchy rain possibleBelfast15 °C / 8 °CPatchy rain possibleBangor15 °C / 10 °CPatchy rain possibleDerry15 °C / 8 °CPatchy rain possibleLisburn16 °C / 8 °CPatchy rain possibleNewtownabbey15 °C / 8 °CPatchy rain possibleCraigavon15 °C / 9 °CPatchy rain possiblePortrush14 °C / 10 °CPatchy rain possibleEnniskillen14 °C / 7 °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
 17° /10° 2.8 mm 3
2 Sept. Light rain shower
Light rain shower
 18° /10° 3.1 mm 3
3 Sept. Light rain shower
Light rain shower
 17° /10° 4.9 mm 4
4 Sept. Patchy rain possible
Patchy rain possible
 17° /9° 1.6 mm 4
5 Sept. Overcast
Overcast
 18° /9° 0 mm 4
6 Sept. Partly cloudy
Partly cloudy
 20° /11° 0.3 mm 4
7 Sept. Patchy rain possible
Patchy rain possible
 19° /11° 2.4 mm 4
8 Sept. Partly cloudy
Partly cloudy
 18° /9° 0.7 mm 4
9 Sept. Overcast
Overcast
 17° /9° 0.6 mm 4
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /10° 7.3 mm 3
11 Sept. Light rain shower
Light rain shower
 15° /8° 2.6 mm 3
12 Sept. Light rain shower
Light rain shower
 15° /7° 3.9 mm 3
13 Sept. Overcast
Overcast
 15° /6° 1.2 mm 3
14 Sept. Overcast
Overcast
 17° /9° 3.4 mm 3
15 Sept. Moderate rain
Moderate rain
 14° /9° 7.8 mm 3
16 Sept. Cloudy
Cloudy
 16° /8° 0.4 mm 3
17 Sept. Light rain
Light rain
 16° /9° 8.5 mm 3
18 Sept. Patchy rain possible
Patchy rain possible
 16° /9° 4.3 mm 3
19 Sept. Light rain
Light rain
 16° /9° 4.7 mm 4
20 Sept. Sunny
Sunny
 15° /8° 0 mm 2.8
21 Sept. Sunny
Sunny
 22° /12° 0.7 mm 3.1
22 Sept. Overcast
Overcast
 18° /12° 0.3 mm 2.1
23 Sept. Patchy rain possible
Patchy rain possible
 14° /8° 10.9 mm 2.4
24 Sept. Overcast
Overcast
 16° /8° 0 mm 4
25 Sept. Partly cloudy
Partly cloudy
 18° /12° 0 mm 5
26 Sept. Fog
Fog
 17° /9° 0.1 mm 5
27 Sept. Overcast
Overcast
 16° /8° 0 mm 4
28 Sept. Sunny
Sunny
 21° /10° 0 mm 6
29 Sept. Sunny
Sunny
 19° /12° 0 mm 5
30 Sept. Sunny
Sunny
 22° /12° 0 mm 6
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?
During September, expect a variety of temperatures with highs around 15° and lows near 8°, suitable for diverse activities and preferences.

How much rainfall should be expected in Northern Ireland during September?
Significant rainfall exceeding 109.1 mm is expected in Northern Ireland during September, occurring over more than 22 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 💧
Typically, Northern Ireland has 22 rainy days in September with a total of 109.1 mm of rainfall.

UV exposure in Northern Ireland during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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 StrabaneFermanagh and OmaghLisburn and Castlereagh
Top locations in Northern Ireland
Select a location for an accurate weather forecast
BangorBelfastCraigavonDerryEnniskillenLisburnNewtownabbeyPortrush
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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