Derry
September
Weather in Derry for September 2026
Your guide to Derry weather in September - trends and predictions
Until now, September 2026 in Derry is slightly cooler than the historical average by 1.9 °C.
Expect cooler weather in the next days in Derry with the forecast suggesting a temperature of 15.3 °C, lower than the historical average.
In general, the average temperature in Derry at the beginning of September is 18.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.7 °C by the end of September.
Derry experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 100 mm.
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Temperatures
Rain 🌧️
More
6
Dry days
24
Rainy days
0
Snow days
15°/8°
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° | 3.6 mm | 3 | |
| 2 Sept. | Light rain shower | 18° /9° | 3.8 mm | 3 | |
| 3 Sept. |  Partly cloudy | 17° /9° | 2.2 mm | 4 | |
| 4 Sept. | Light rain shower | 18° /8° | 1.4 mm | 4 | |
| 5 Sept. |  Fog | 18° /9° | 0.1 mm | 4 | |
| 6 Sept. | Mist | 20° /10° | 0.6 mm | 4 | |
| 7 Sept. | Patchy rain possible | 20° /10° | 2.2 mm | 4 | |
| 8 Sept. | Patchy rain possible | 18° /9° | 2.3 mm | 4 | |
| 9 Sept. | Patchy rain possible | 17° /9° | 0.7 mm | 3 | |
| 10 Sept. | Light rain shower | 16° /9° | 5.6 mm | 3 | |
| 11 Sept. | Light rain shower | 13° /6° | 6.6 mm | 3 | |
| 12 Sept. | Patchy rain possible | 16° /10° | 6.8 mm | 3.2 | |
| 13 Sept. |  Overcast | 16° /8° | 0 mm | 3.2 | |
| 14 Sept. | Mist | 21° /13° | 6.4 mm | 2.6 | |
| 15 Sept. | Patchy rain possible | 15° /10° | 13.9 mm | 3 | |
| 16 Sept. | Patchy rain possible | 14° /10° | 0.8 mm | 3 | |
| 17 Sept. | Patchy rain possible | 16° /8° | 0.1 mm | 4 | |
| 18 Sept. | Patchy rain possible | 15° /12° | 6.2 mm | 4 | |
| 19 Sept. | Light rain shower | 13° /8° | 10.6 mm | 3 | |
| 20 Sept. | Patchy rain possible | 13° /7° | 12.7 mm | 3 | |
| 21 Sept. | Patchy rain possible | 13° /6° | 5 mm | 4 | |
| 22 Sept. | Mist | 15° /6° | 0.3 mm | 4 | |
| 23 Sept. | Patchy rain possible | 16° /13° | 1.7 mm | 4 | |
| 24 Sept. | Patchy rain possible | 16° /11° | 0.8 mm | 4 | |
| 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.
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Derry in September - FAQ
What are the expected maximum and minimum temperatures in Derry during September?
During September, expect a variety of temperatures with highs around 15° and lows near 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in Derry during September?
Significant rainfall exceeding 100 mm is expected in Derry during September, occurring over more than 24 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 💧
Typically, Derry has 24 rainy days in September with a total of 100 mm of rainfall.
UV exposure in Derry during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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