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Weather in Northern Ireland for September 2027

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

    Temperatures

  • In general, the average temperature in Northern Ireland at the beginning of September is 17.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.9 °C by the end of September.

    • Rain 🌧️

  • Northern Ireland in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 109.5 mm.

    • More

  • Is September a good time to visit Northern Ireland? check out the best time to travel to Northern Ireland page.

  • ✨ Is September a good time to visit Northern Ireland? – Ask the AI Weatherman

Average dry days
13
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/9°
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
Light rain
16°
2
Light rain
18°
3
Light rain
16°
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
16°
11
Light rain
15°
12
Light rain
15°
13
Patchy rain possible
14°
14
Light rain
16°
15
Moderate rain
14°
16
Cloudy
16°
17
Light rain
16°
18
Light rain
16°
19
Light rain
16°
20
Light rain shower
15°
21
Light rain shower
16°
22
Patchy rain possible
15°
23
Light rain
14°
24
Light rain
15°
25
Patchy rain possible
14°
26
Light rain
14°
27
Moderate rain
13°
28
Light rain shower
14°
29
Patchy rain possible
15°
30
Moderate rain
14°

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 possibleBelfast16 °C / 9 °CPatchy rain possibleBangor15 °C / 11 °CPatchy rain possibleDerry15 °C / 8 °CPatchy rain possibleLisburn16 °C / 9 °CPatchy rain possibleNewtownabbey16 °C / 9 °CPatchy rain possibleCraigavon16 °C / 9 °CPatchy rain possiblePortrush15 °C / 11 °CPatchy rain possibleEnniskillen15 °C / 8 °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. Light rain
Light rain
 16° /11° 2.8 mm 3
2 Sept. Light rain
Light rain
 18° /10° 3.1 mm 3
3 Sept. Light rain
Light rain
 16° /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° /12° 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° /10° 0.6 mm 4
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 16° /10° 7.3 mm 3
11 Sept. Light rain
Light rain
 15° /9° 2.6 mm 3
12 Sept. Light rain
Light rain
 15° /8° 3.9 mm 3
13 Sept. Patchy rain possible
Patchy rain possible
 14° /7° 1.2 mm 3
14 Sept. Light rain
Light rain
 16° /10° 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° /10° 8.5 mm 3
18 Sept. Light rain
Light rain
 16° /10° 4.3 mm 3
19 Sept. Light rain
Light rain
 16° /10° 3.9 mm 3
20 Sept. Light rain shower
Light rain shower
 15° /9° 1.3 mm 3
21 Sept. Light rain shower
Light rain shower
 16° /8° 0.6 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 15° /8° 1.3 mm 3
23 Sept. Light rain
Light rain
 14° /7° 2.6 mm 3
24 Sept. Light rain
Light rain
 15° /8° 4.3 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 14° /9° 1.6 mm 3
26 Sept. Light rain
Light rain
 14° /8° 7.3 mm 2.9
27 Sept. Moderate rain
Moderate rain
 13° /7° 16.9 mm 2
28 Sept. Light rain shower
Light rain shower
 14° /6° 1.2 mm 2.8
29 Sept. Patchy rain possible
Patchy rain possible
 15° /8° 1.4 mm 2.7
30 Sept. Moderate rain
Moderate rain
 14° /9° 11.6 mm 2.6
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?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 9°. 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 109.5 mm is expected in Northern Ireland during September, occurring over more than 17 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 17 rainy days in September with a total of 109.5 mm of rainfall.
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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