Derry
September
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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9
Dry days
21
Rainy days
0
Snow days
17°/9°
Temperatures
20 km/h
Avg max wind
86 %
Avg humidity
Derry in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2  18° | 3  18° | 4 18° | 5 20° | 6 22° | 7 24° |
| 8 20° | 9 18° | 10 17° | 11 13° | 12 13° | 13  12° | 14 16° |
| 15  14° | 16 17° | 17 18° | 18 16° | 19 18° | 20 17° | 21  14° |
| 22 14° | 23 14° | 24 14° | 25 13° | 26 12° | 27 12° | 28 13° |
| 29 14° | 30 13° |
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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 | 17° /9° | 0.1 mm | 4 | |
| 2 Sept. | Mist | 18° /10° | 5.3 mm | 4 | |
| 3 Sept. | Partly cloudy | 18° /9° | 1.1 mm | 5 | |
| 4 Sept. | Partly cloudy | 18° /8° | 1.7 mm | 5 | |
| 5 Sept. | Mist | 20° /9° | 0 mm | 5 | |
| 6 Sept. | Mist | 22° /11° | 0.3 mm | 5 | |
| 7 Sept. | Patchy rain possible | 24° /13° | 0.2 mm | 5 | |
| 8 Sept. | Patchy rain possible | 20° /11° | 3.1 mm | 5 | |
| 9 Sept. | Light rain shower | 18° /10° | 1 mm | 4 | |
| 10 Sept. | Light rain shower | 17° /10° | 4.2 mm | 4 | |
| 11 Sept. | Light rain shower | 13° /6° | 5.3 mm | 4 | |
| 12 Sept. | Mist | 13° /4° | 1 mm | 4 | |
| 13 Sept. | Moderate rain | 12° /4° | 8.3 mm | 3 | |
| 14 Sept. | Mist | 16° /8° | 0.6 mm | 4 | |
| 15 Sept. | Overcast | 14° /7° | 0.2 mm | 4 | |
| 16 Sept. | Patchy rain possible | 17° /6° | 0.1 mm | 4 | |
| 17 Sept. | Moderate rain | 18° /9° | 8.1 mm | 5 | |
| 18 Sept. | Light rain shower | 16° /8° | 3.8 mm | 4 | |
| 19 Sept. | Light rain shower | 18° /8° | 6.4 mm | 5 | |
| 20 Sept. | Light rain shower | 17° /8° | 6.7 mm | 5 | |
| 21 Sept. | Light rain | 14° /6° | 2.7 mm | 4 | |
| 22 Sept. | Light rain shower | 14° /8° | 3 mm | 4 | |
| 23 Sept. | Patchy light rain | 14° /5° | 1.3 mm | 3 | |
| 24 Sept. | Light rain shower | 14° /9° | 4.2 mm | 4 | |
| 25 Sept. | Patchy rain possible | 13° /9° | 2.2 mm | 3 | |
| 26 Sept. | Light rain shower | 12° /5° | 8.2 mm | 3 | |
| 27 Sept. | Light rain shower | 12° /5° | 5.3 mm | 3 | |
| 28 Sept. | Light drizzle | 13° /7° | 2 mm | 3 | |
| 29 Sept. | Patchy rain possible | 14° /7° | 0.7 mm | 4 | |
| 30 Sept. | 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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