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Weather in Derry for September 2025

Your guide to Derry weather in September - trends and predictions
  • In general, the average temperature in Derry at the beginning of September is 19.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13 °C by the end of September.

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

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Average dry days
9
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/9°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
86 %
Avg humidity

Derry in September average weather

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Temperatures trend during September in Derry

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. Patchy rain possible
Patchy rain possible
17° /9° 0.1 mm 4
2 Sept. Mist
Mist
18° /10° 5.3 mm 4
3 Sept. Partly cloudy
Partly cloudy
18° /9° 1.1 mm 5
4 Sept. Partly cloudy
Partly cloudy
18° /8° 1.7 mm 5
5 Sept. Mist
Mist
20° /9° 0 mm 5
6 Sept. Mist
Mist
22° /11° 0.3 mm 5
7 Sept. Patchy rain possible
Patchy rain possible
24° /13° 0.2 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
20° /11° 3.1 mm 5
9 Sept. Light rain shower
Light rain shower
18° /10° 1 mm 4
10 Sept. Light rain shower
Light rain shower
17° /10° 4.2 mm 4
11 Sept. Light rain shower
Light rain shower
13° /6° 5.3 mm 4
12 Sept. Mist
Mist
13° /4° 1 mm 4
13 Sept. Moderate rain
Moderate rain
12° /4° 8.3 mm 3
14 Sept. Mist
Mist
16° /8° 0.6 mm 4
15 Sept. Overcast
Overcast
14° /7° 0.2 mm 4
16 Sept. Patchy rain possible
Patchy rain possible
17° /6° 0.1 mm 4
17 Sept. Moderate rain
Moderate rain
18° /9° 8.1 mm 5
18 Sept. Light rain shower
Light rain shower
16° /8° 3.8 mm 4
19 Sept. Light rain shower
Light rain shower
18° /8° 6.4 mm 5
20 Sept. Light rain shower
Light rain shower
17° /8° 6.7 mm 5
21 Sept. Light rain
Light rain
14° /6° 2.7 mm 4
22 Sept. Light rain shower
Light rain shower
14° /8° 3 mm 4
23 Sept. Patchy light rain
Patchy light rain
14° /5° 1.3 mm 3
24 Sept. Light rain shower
Light rain shower
14° /9° 4.2 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
13° /9° 2.2 mm 3
26 Sept. Light rain shower
Light rain shower
12° /5° 8.2 mm 3
27 Sept. Light rain shower
Light rain shower
12° /5° 5.3 mm 3
28 Sept. Light drizzle
Light drizzle
13° /7° 2 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
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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.

Derry in September - FAQ

What are the expected maximum and minimum temperatures in Derry during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 9°. 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 112.1 mm is expected in Derry during September, occurring over more than 21 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 20 km/h, suggesting breezy to windy conditions, depending on your activities.

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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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