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United Kingdom weather

Weather in Derry for September 2025

Your guide to Derry weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Derry is cooler than usual, with temperatures averaging 14.8 °C, this is -2.2 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Derry with the forecast suggesting a temperature of 13.9 °C, lower than the historical average.

  • In general, the average temperature in Derry at the beginning of September is 18.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.9 °C by the end of September.

    • Rain 🌧️

  • Derry in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 204.7 mm.

    • More

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

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/6°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
85 %
Avg humidity

Derry 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
Partly cloudy
17°
4
Light rain shower
18°
5
Fog
19°
6
Mist
21°
7
Patchy rain possible
21°
8
Patchy rain possible
19°
9
Patchy rain possible
17°
10
Light rain shower
16°
11
Light rain shower
13°
12
Light rain shower
13°
13
Moderate rain
12°
14
Mist
16°
15
Moderate rain
15°
16
Patchy rain possible
15°
17
Patchy rain possible
19°
18
Patchy rain possible
17°
19
Patchy rain possible
16°
20
Patchy rain possible
11°
21
Patchy rain possible
12°
22
Patchy rain possible
12°
23
Patchy rain possible
14°
24
Partly cloudy
11°
25
Sunny
13°
26
Mist
12°
27
Cloudy
13°
28
Sunny
14°
29
Patchy rain possible
14°
30
Light drizzle
13°

Temperatures trend during September in Derry

See the weather trend as well as the moving average line

September weather in Derry 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° /9° 4.1 mm 4
2 Sept. Light rain shower
Light rain shower
 18° /9° 3.9 mm 4
3 Sept. Partly cloudy
Partly cloudy
 17° /9° 1.9 mm 4
4 Sept. Light rain shower
Light rain shower
 18° /8° 1.5 mm 4
5 Sept. Fog
Fog
 19° /9° 0 mm 4
6 Sept. Mist
Mist
 21° /10° 0.3 mm 5
7 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 1.9 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 19° /9° 2.2 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 17° /9° 0.7 mm 4
10 Sept. Light rain shower
Light rain shower
 16° /9° 6.8 mm 4
11 Sept. Light rain shower
Light rain shower
 13° /6° 6.6 mm 3
12 Sept. Light rain shower
Light rain shower
 13° /5° 4.5 mm 3
13 Sept. Moderate rain
Moderate rain
 12° /4° 7.4 mm 3
14 Sept. Mist
Mist
 16° /8° 0.6 mm 4
15 Sept. Moderate rain
Moderate rain
 15° /9° 9.1 mm 0.7
16 Sept. Patchy rain possible
Patchy rain possible
 15° /9° 1.9 mm 0.8
17 Sept. Patchy rain possible
Patchy rain possible
 19° /9° 1.7 mm 0.6
18 Sept. Patchy rain possible
Patchy rain possible
 17° /11° 0.6 mm 0.6
19 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 1.7 mm 0.6
20 Sept. Patchy rain possible
Patchy rain possible
 11° /8° 3.6 mm 2
21 Sept. Patchy rain possible
Patchy rain possible
 12° /7° 0.8 mm 2
22 Sept. Patchy rain possible
Patchy rain possible
 12° /6° 0.1 mm 2
23 Sept. Patchy rain possible
Patchy rain possible
 14° /9° 0.9 mm 3
24 Sept. Partly cloudy
Partly cloudy
 11° /4° 0 mm 3
25 Sept. Sunny
Sunny
 13° /6° 0 mm 3
26 Sept. Mist
Mist
 12° /5° 0 mm 2
27 Sept. Cloudy
Cloudy
 13° /5° 0.1 mm 2
28 Sept. Sunny
Sunny
 14° /3° 0 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 14° /7° 0.7 mm 4
30 Sept. Light drizzle
Light drizzle
 13° /7° 3.3 mm 4
Next
Important Notice
Our weather forecast for Derry 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 Derry forecast closer to your planned date for the most up-to-date weather information.
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Derry in September - FAQ

What are the expected maximum and minimum temperatures in Derry during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Derry during September?
Significant rainfall exceeding 204.7 mm is expected in Derry during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Derry during September?
The average wind speed in Derry during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Derry

Explore the daily rainfall trends and prepare for Derrys September weather 💧

UV exposure in Derry during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Derry?

Get accurate weather forecasts for Derry, located at latitude 54.998 and longitude -7.309. Stay updated with localized weather information tailored for Derry.

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