Weather in Derry City and Strabane for September 2025
Until now, September 2025 in Derry City and Strabane is cooler than usual, with temperatures averaging 14.6 °C, this is -2.2 °C below the typical seasonal average.
Expect cooler weather in the next days in Derry City and Strabane with the forecast suggesting a temperature of 13.9 °C, lower than the historical average.
In general, the average temperature in Derry City and Strabane at the beginning of September is 18.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.1 °C by the end of September.
Derry City and Strabane in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 204.7 mm.
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Derry City and Strabane Weather September
Temperatures trend during September in Derry City and Strabane
September weather in Derry City and Strabane day by day
| 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 | 15° /10° | 3.3 mm | 0.7 | |
| 17 Sept. | Moderate rain | 16° /10° | 12.3 mm | 0.7 | |
| 18 Sept. | Patchy rain possible | 17° /11° | 4 mm | 0.4 | |
| 19 Sept. | Patchy rain possible | 17° /10° | 0.5 mm | 0.6 | |
| 20 Sept. | Patchy rain possible | 15° /9° | 3.8 mm | 0.1 | |
| 21 Sept. | Patchy rain possible | 11° /9° | 1.7 mm | 2 | |
| 22 Sept. | Patchy rain possible | 12° /6° | 0.2 mm | 2 | |
| 23 Sept. | Patchy rain possible | 13° /6° | 0.8 mm | 3 | |
| 24 Sept. |  Sunny | 15° /4° | 0 mm | 3 | |
| 25 Sept. |  Cloudy | 15° /6° | 0 mm | 2 | |
| 26 Sept. | Patchy rain possible | 14° /6° | 0 mm | 2 | |
| 27 Sept. | Patchy rain possible | 13° /9° | 2.6 mm | 3 | |
| 28 Sept. | Moderate rain | 10° /8° | 5.3 mm | 2 | |
| 29 Sept. | Patchy rain possible | 12° /8° | 0.2 mm | 2 | |
| 30 Sept. |  Light drizzle | 13° /7° | 3.3 mm | 4 | |
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Derry City and Strabane in September - FAQ
September rainfall patterns in Derry City and Strabane
UV exposure in Derry City and Strabane during September
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Where is Derry City and Strabane?Get accurate weather forecasts for Derry City and Strabane, located at latitude 54.998 and longitude -7.309. Stay updated with localized weather information tailored for Derry City and Strabane.