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Lisburn and Castlereagh (Lisburn)
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Weather in Lisburn and Castlereagh for September 2026

Your guide to Lisburn and Castlereagh weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Lisburn and Castlereagh has been nearly identical to the historical average, with a temperature of 16.6 °C (showing only a slight deviation of 0.3 °C).

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

  • In general, the average temperature in Lisburn and Castlereagh at the beginning of September is 18.3 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 18.4 °C by the end of September.

    • Rain 🌧️

  • Lisburn and Castlereagh experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 109.4 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
16°/8°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
85 %
Avg humidity

Lisburn and Castlereagh Weather September

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

Temperatures trend during September in Lisburn and Castlereagh

See the weather trend as well as the moving average line

September weather in Lisburn and Castlereagh day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 17° /10° 2.9 mm 3
2 Sept. Light rain shower
Light rain shower
 18° /10° 3 mm 4
3 Sept. Partly cloudy
Partly cloudy
 17° /10° 5.4 mm 4
4 Sept. Sunny
Sunny
 18° /8° 1.3 mm 4
5 Sept. Partly cloudy
Partly cloudy
 18° /9° 0 mm 4
6 Sept. Patchy rain possible
Patchy rain possible
 20° /12° 0.4 mm 4
7 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 1.9 mm 4
8 Sept. Cloudy
Cloudy
 18° /9° 0.7 mm 4
9 Sept. Patchy rain possible
Patchy rain possible
 17° /10° 0.6 mm 4
10 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /10° 8.6 mm 3
11 Sept. Light rain shower
Light rain shower
 15° /8° 2.3 mm 3
12 Sept. Cloudy
Cloudy
 15° /7° 3.8 mm 3
13 Sept. Mist
Mist
 15° /6° 2.2 mm 3
14 Sept. Overcast
Overcast
 17° /9° 3.4 mm 3
15 Sept. Moderate rain
Moderate rain
 14° /9° 8.3 mm 3
16 Sept. Patchy rain possible
Patchy rain possible
 16° /8° 0.6 mm 3
17 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 7.1 mm 3
18 Sept. Light drizzle
Light drizzle
 16° /8° 5.1 mm 3
19 Sept. Light rain
Light rain
 17° /8° 5.3 mm 4
20 Sept. Sunny
Sunny
 15° /8° 0 mm 2.9
21 Sept. Partly cloudy
Partly cloudy
 22° /11° 0.7 mm 3.2
22 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 0.8 mm 2.2
23 Sept. Patchy rain possible
Patchy rain possible
 14° /8° 10.8 mm 2.5
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 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.
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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 16° and cooler nights around 8°. 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 109.4 mm is expected in Lisburn and Castlereagh during September, occurring over more than 22 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 💧
Typically, Lisburn and Castlereagh has 22 rainy days in September with a total of 109.4 mm of rainfall.

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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