County Donegal (Donegal)
September
Weather in County Donegal for September 2026
Your guide to County Donegal weather in September - trends and predictions
In general, the average temperature in County Donegal at the beginning of September is 18.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °C by the end of September.
County 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
County Donegal Weather September
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Temperatures trend during September in County Donegal
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September weather in County Donegal day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 17° /9° | 6.8 mm | 4 | |
| 2 Sept. | Light rain shower | 17° /9° | 3.5 mm | 4 | |
| 3 Sept. |  Sunny | 17° /9° | 1.4 mm | 4 | |
| 4 Sept. |  Partly cloudy | 18° /8° | 0.8 mm | 4 | |
| 5 Sept. |  Mist | 19° /9° | 0.2 mm | 4 | |
| 6 Sept. | Light rain shower | 21° /11° | 1.4 mm | 5 | |
| 7 Sept. | Partly cloudy | 21° /11° | 1.9 mm | 5 | |
| 8 Sept. | Light rain shower | 18° /10° | 3.2 mm | 4 | |
| 9 Sept. | Light rain shower | 16° /10° | 2 mm | 4 | |
| 10 Sept. | Mist | 15° /10° | 8.4 mm | 4 | |
| 11 Sept. | Light rain shower | 13° /8° | 8 mm | 3 | |
| 12 Sept. | Light rain shower | 13° /6° | 5.3 mm | 3 | |
| 13 Sept. |  Moderate rain | 12° /5° | 10 mm | 3 | |
| 14 Sept. |  Overcast | 14° /8° | 3.9 mm | 3 | |
| 15 Sept. | Overcast | 14° /9° | 6.2 mm | 3 | |
| 16 Sept. |  Cloudy | 16° /8° | 1.6 mm | 4 | |
| 17 Sept. |  Light rain | 17° /10° | 8.6 mm | 4 | |
| 18 Sept. | Light rain shower | 16° /8° | 3.9 mm | 4 | |
| 19 Sept. | Light rain shower | 17° /8° | 8.7 mm | 4 | |
| 20 Sept. | Light rain shower | 16° /8° | 6.7 mm | 4 | |
| 21 Sept. | Light rain shower | 14° /6° | 3 mm | 3 | |
| 22 Sept. | Light rain shower | 15° /6° | 1.7 mm | 3 | |
| 23 Sept. | Patchy light rain | 14° /5° | 1.1 mm | 4 | |
| 24 Sept. | Light rain shower | 14° /7° | 3.9 mm | 3 | |
| 25 Sept. | Light rain shower | 14° /7° | 1.4 mm | 4 | |
| 26 Sept. | Light rain shower | 13° /6° | 6.9 mm | 3 | |
| 27 Sept. | Light rain shower | 13° /6° | 9.3 mm | 3 | |
| 28 Sept. | Light rain shower | 13° /7° | 2.7 mm | 3 | |
| 29 Sept. | Light rain shower | 14° /7° | 1.3 mm | 3 | |
| 30 Sept. | Light drizzle | 14° /8° | 3.6 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for County 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 County Donegal forecast closer to your planned date for the most up-to-date weather information.
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County Donegal in September - FAQ
What are the expected maximum and minimum temperatures in County 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 County Donegal during September?
Significant rainfall exceeding 104.1 mm is expected in County 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 County Donegal during September?
The average wind speed in County Donegal during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in County Donegal
Explore the daily rainfall trends and prepare for County Donegals September weather 💧
UV exposure in County Donegal during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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