Derry
September
Weather in Derry for September 2026
Your guide to Derry weather in September - trends and predictions
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 13.4 °C by the end of September.
Derry in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 204.7 mm.
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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
18°/6°
Temperatures
19 km/h
Avg max wind
85 %
Avg humidity
Derry Weather September
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Temperatures trend during September in Derry
See the weather trend as well as the moving average line
September weather in Derry day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 16° /9° | 4.1 mm | 4 | |
| 2 Sept. | Light rain shower | 18° /9° | 3.9 mm | 4 | |
| 3 Sept. |  Partly cloudy | 17° /9° | 1.9 mm | 4 | |
| 4 Sept. | Light rain shower | 18° /8° | 1.5 mm | 4 | |
| 5 Sept. |  Fog | 19° /9° | 0 mm | 4 | |
| 6 Sept. | Mist | 21° /10° | 0.3 mm | 5 | |
| 7 Sept. | Patchy rain possible | 21° /11° | 1.9 mm | 5 | |
| 8 Sept. | Patchy rain possible | 19° /9° | 2.2 mm | 5 | |
| 9 Sept. | Patchy rain possible | 17° /9° | 0.7 mm | 4 | |
| 10 Sept. | Light rain shower | 16° /9° | 6.8 mm | 4 | |
| 11 Sept. | Light rain shower | 13° /6° | 6.6 mm | 3 | |
| 12 Sept. | Light rain shower | 13° /5° | 4.5 mm | 3 | |
| 13 Sept. |  Moderate rain | 12° /4° | 7.4 mm | 3 | |
| 14 Sept. | Mist | 15° /8° | 4.2 mm | 4 | |
| 15 Sept. | Light rain shower | 14° /8° | 3.2 mm | 3 | |
| 16 Sept. | Patchy rain possible | 16° /6° | 0.7 mm | 4 | |
| 17 Sept. | Moderate rain | 17° /9° | 8.4 mm | 4 | |
| 18 Sept. | Light rain shower | 16° /8° | 3.1 mm | 4 | |
| 19 Sept. | Light rain shower | 17° /8° | 4.4 mm | 5 | |
| 20 Sept. | Light rain shower | 16° /8° | 6.9 mm | 4 | |
| 21 Sept. |  Light rain | 13° /6° | 2.6 mm | 3 | |
| 22 Sept. | Light rain shower | 14° /6° | 2 mm | 3 | |
| 23 Sept. | Patchy light rain | 14° /4° | 0.9 mm | 3 | |
| 24 Sept. | Light rain shower | 14° /7° | 2.8 mm | 3 | |
| 25 Sept. | Patchy rain possible | 14° /8° | 1.5 mm | 3 | |
| 26 Sept. | Light rain shower | 13° /5° | 5.4 mm | 4 | |
| 27 Sept. | Light rain shower | 12° /5° | 6.8 mm | 3 | |
| 28 Sept. | Light drizzle | 13° /6° | 2 mm | 3 | |
| 29 Sept. | Patchy rain possible | 14° /7° | 0.6 mm | 3 | |
| 30 Sept. | Light drizzle | 14° /8° | 2.8 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.
Change Month
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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