Donegal
September
Weather in Donegal for September 2025
Your guide to Donegal weather in September - trends and predictions
In general, the average temperature in Donegal at the beginning of September is 19.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.9 °C by the end of September.
Donegal experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 104.1 mm.
Temperatures
Rain 🌧️
4
Dry days
26
Rainy days
0
Snow days
16°/8°
Temperatures
19 km/h
Avg max wind
83 %
Avg humidity
Donegal in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  18° | 2  17° | 3  17° | 4  18° | 5 21° | 6 23° | 7 23° |
| 8 20° | 9 17° | 10 16° | 11 13° | 12  13° | 13  12° | 14  14° |
| 15 14° | 16 16° | 17  17° | 18 16° | 19 18° | 20 18° | 21 15° |
| 22 16° | 23 15° | 24 14° | 25 13° | 26 11° | 27 12° | 28 13° |
| 29 14° | 30 13° |
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Temperatures trend during September in Donegal
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. | Light rain shower | 18° /9° | 1 mm | 4 | |
| 2 Sept. | Mist | 17° /10° | 4.7 mm | 4 | |
| 3 Sept. | Sunny | 17° /9° | 1.3 mm | 5 | |
| 4 Sept. | Partly cloudy | 18° /8° | 1 mm | 5 | |
| 5 Sept. | Mist | 21° /10° | 0 mm | 5 | |
| 6 Sept. | Light rain shower | 23° /12° | 1.4 mm | 6 | |
| 7 Sept. | Partly cloudy | 23° /13° | 0.4 mm | 6 | |
| 8 Sept. | Light rain shower | 20° /12° | 3.8 mm | 5 | |
| 9 Sept. | Light rain shower | 17° /10° | 2.2 mm | 4 | |
| 10 Sept. | Mist | 16° /10° | 2.9 mm | 4 | |
| 11 Sept. | Light rain shower | 13° /7° | 4.2 mm | 4 | |
| 12 Sept. | Cloudy | 13° /5° | 1 mm | 4 | |
| 13 Sept. | Moderate rain | 12° /4° | 8.4 mm | 3 | |
| 14 Sept. | Overcast | 14° /8° | 1.1 mm | 3 | |
| 15 Sept. | Overcast | 14° /8° | 0.3 mm | 4 | |
| 16 Sept. | Cloudy | 16° /7° | 0 mm | 4 | |
| 17 Sept. | Light rain | 17° /10° | 5.8 mm | 5 | |
| 18 Sept. | Light rain shower | 16° /8° | 4.8 mm | 4 | |
| 19 Sept. | Light rain shower | 18° /8° | 12.6 mm | 5 | |
| 20 Sept. | Light rain shower | 18° /8° | 6.6 mm | 5 | |
| 21 Sept. | Light rain shower | 15° /7° | 4.2 mm | 4 | |
| 22 Sept. | Light rain shower | 16° /8° | 2.6 mm | 4 | |
| 23 Sept. | Patchy light rain | 15° /6° | 1.6 mm | 4 | |
| 24 Sept. | Light rain shower | 14° /9° | 5.9 mm | 4 | |
| 25 Sept. | Light rain shower | 13° /8° | 2.2 mm | 4 | |
| 26 Sept. | Light rain shower | 11° /6° | 10.4 mm | 3 | |
| 27 Sept. | Light rain shower | 12° /6° | 6.8 mm | 3 | |
| 28 Sept. | Light rain | 13° /7° | 2.7 mm | 3 | |
| 29 Sept. | Light rain shower | 14° /7° | 1.5 mm | 3 | |
| 30 Sept. | Light drizzle | 13° /7° | 2.9 mm | 3 | |
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Important Notice
Our weather forecast for Donegal 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 Donegal forecast closer to your planned date for the most up-to-date weather information.
Donegal in September - FAQ
What are the expected maximum and minimum temperatures in Donegal during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Donegal during September?
Significant rainfall exceeding 104.1 mm is expected in Donegal during September, occurring over more than 26 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Donegal during September?
The average wind speed in Donegal during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Donegal
Explore the daily rainfall trends and prepare for Donegals September weather 💧
UV exposure in Donegal during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Donegal?Get accurate weather forecasts for Donegal, located at latitude 54.654 and longitude -8.111. Stay updated with localized weather information tailored for Donegal.
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