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Weather in Lisburn and Castlereagh for September 2025

Your guide to Lisburn and Castlereagh weather in September - trends and predictions
  • In general, the average temperature in Lisburn and Castlereagh at the beginning of September is 19 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °C by the end of September.

  • Lisburn and Castlereagh experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
9
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/10°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
87 %
Avg humidity

Lisburn and Castlereagh in September average weather

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Temperatures trend during September in Lisburn and Castlereagh

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
16° /11° 0.8 mm 4
2 Sept. Patchy rain possible
Patchy rain possible
18° /10° 4.7 mm 5
3 Sept. Partly cloudy
Partly cloudy
18° /9° 0.3 mm 5
4 Sept. Sunny
Sunny
18° /9° 0.9 mm 5
5 Sept. Partly cloudy
Partly cloudy
19° /10° 0 mm 5
6 Sept. Patchy rain possible
Patchy rain possible
22° /13° 0.1 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
22° /13° 1.4 mm 5
8 Sept. Cloudy
Cloudy
21° /12° 1 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
19° /12° 1.1 mm 5
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
17° /10° 10.2 mm 4
11 Sept. Light rain shower
Light rain shower
14° /8° 3.3 mm 4
12 Sept. Cloudy
Cloudy
14° /5° 0.2 mm 4
13 Sept. Mist
Mist
14° /4° 2.3 mm 4
14 Sept. Overcast
Overcast
17° /9° 0.2 mm 4
15 Sept. Moderate rain
Moderate rain
13° /9° 9.2 mm 4
16 Sept. Patchy rain possible
Patchy rain possible
16° /7° 0.1 mm 4
17 Sept. Light rain
Light rain
17° /10° 6.6 mm 4
18 Sept. Light drizzle
Light drizzle
16° /8° 2 mm 4
19 Sept. Light rain
Light rain
17° /8° 4.5 mm 4
20 Sept. Light rain shower
Light rain shower
17° /8° 2.8 mm 4
21 Sept. Light rain shower
Light rain shower
16° /8° 0.8 mm 4
22 Sept. Light rain shower
Light rain shower
15° /8° 1.7 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
15° /6° 0.4 mm 4
24 Sept. Light rain shower
Light rain shower
15° /9° 7.2 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
14° /8° 1.8 mm 4
26 Sept. Light rain shower
Light rain shower
12° /7° 12.3 mm 3
27 Sept. Light rain shower
Light rain shower
13° /5° 11.3 mm 3
28 Sept. Light rain shower
Light rain shower
14° /6° 2 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
14° /7° 0.8 mm 4
30 Sept. Light rain
Light rain
13° /8° 10.3 mm 3
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Important Notice
Our weather forecast for Lisburn and Castlereagh 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 Lisburn and Castlereagh forecast closer to your planned date for the most up-to-date weather information.

Lisburn and Castlereagh in September - FAQ

What are the expected maximum and minimum temperatures in Lisburn and Castlereagh during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Lisburn and Castlereagh during September?
Significant rainfall exceeding 133.7 mm is expected in Lisburn and Castlereagh during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Lisburn and Castlereagh during September?
The average wind speed in Lisburn and Castlereagh during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Lisburn and Castlereagh

Explore the daily rainfall trends and prepare for Lisburn and Castlereaghs September weather 💧

UV exposure in Lisburn and Castlereagh during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Lisburn and Castlereagh?

Get accurate weather forecasts for Lisburn and Castlereagh, located at latitude 54.523 and longitude -6.035. Stay updated with localized weather information tailored for Lisburn and Castlereagh.

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