Weather in County Donegal for September 2025
In general, the average temperature in County 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.
Expect significant rainfall in County Donegal during September, with an average of 20 rainy days.
Is September a good time to visit County Donegal? check out the best time to travel to County Donegal page.
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County Donegal in September average weather
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 County Donegal
September weather day by day
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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County Donegal in September - FAQ
What to pack to County Donegal in September?
As you prepare for your trip to County Donegal in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in County Donegal, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in County Donegal
UV exposure in County Donegal during September
Quick links
Get accurate weather forecasts for County Donegal, located at latitude 54.654 and longitude -8.111. Stay updated with localized weather information tailored for County Donegal.