Ulster (Donegal)
September
Weather in Ulster for September 2027
Your guide to Ulster weather in September - trends and predictions
In general, the average temperature in Ulster at the beginning of September is 17.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.5 °C by the end of September.
Ulster in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 136 mm.
Is September a good time to visit Ulster? check out the best time to travel to Ulster page.
Temperatures
Rain 🌧️
More
10
Dry days
20
Rainy days
0
Snow days
15°/9°
Temperatures
21 km/h
Avg max wind
85 %
Avg humidity
Ulster Weather September
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What’s the Weather Like in Ulster This September?
Discover the average temperatures and weather trends across Ulster’s cities this September.
Temperatures trend during September in Ulster
See the weather trend as well as the moving average line
September weather in Ulster day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain | 16° /10° | 5.8 mm | 3 | |
| 2 Sept. | Light rain | 16° /10° | 3.1 mm | 3 | |
| 3 Sept. | Light rain | 16° /10° | 2.6 mm | 4 | |
| 4 Sept. |  Patchy rain possible | 17° /9° | 1 mm | 4 | |
| 5 Sept. |  Mist | 18° /10° | 0.3 mm | 4 | |
| 6 Sept. | Light rain shower | 20° /11° | 1.6 mm | 4 | |
| 7 Sept. | Patchy rain possible | 19° /11° | 2.4 mm | 4 | |
| 8 Sept. | Light rain | 17° /10° | 3.3 mm | 3 | |
| 9 Sept. | Light rain shower | 16° /10° | 1.6 mm | 3 | |
| 10 Sept. | Light rain | 15° /10° | 8.6 mm | 3 | |
| 11 Sept. | Light rain | 13° /9° | 6.2 mm | 3 | |
| 12 Sept. | Light rain | 14° /7° | 7.6 mm | 3 | |
| 13 Sept. |  Moderate rain | 13° /6° | 7.6 mm | 2 | |
| 14 Sept. | Light rain | 15° /9° | 6.7 mm | 2 | |
| 15 Sept. | Light rain | 14° /10° | 8.1 mm | 3 | |
| 16 Sept. | Light rain | 15° /8° | 3 mm | 3 | |
| 17 Sept. | Light rain | 16° /10° | 6.9 mm | 3.6 | |
| 18 Sept. | Light rain | 15° /9° | 7.1 mm | 3 | |
| 19 Sept. | Light rain | 16° /9° | 7.2 mm | 3.4 | |
| 20 Sept. | Light rain | 15° /8° | 5 mm | 3.4 | |
| 21 Sept. | Light rain | 15° /8° | 2.6 mm | 3 | |
| 22 Sept. | Light rain | 15° /8° | 4.6 mm | 3 | |
| 23 Sept. | Patchy light rain | 14° /6° | 1.1 mm | 3 | |
| 24 Sept. | Light rain | 14° /8° | 5.4 mm | 3 | |
| 25 Sept. | Light rain shower | 14° /8° | 1.9 mm | 3 | |
| 26 Sept. | Light rain | 13° /7° | 6.6 mm | 2.9 | |
| 27 Sept. | Moderate rain | 12° /6° | 10.6 mm | 2 | |
| 28 Sept. | Light rain shower | 13° /7° | 2.1 mm | 2.7 | |
| 29 Sept. | Light rain shower | 15° /8° | 1.6 mm | 2.7 | |
| 30 Sept. | Light rain | 14° /9° | 3.8 mm | 2.6 | |
| Next | |||||
Important Notice
Our weather forecast for Ulster 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 Ulster forecast closer to your planned date for the most up-to-date weather information.
Change Month
Ulster in September - FAQ
What are the expected maximum and minimum temperatures in Ulster during September?
During September, expect a variety of temperatures with highs around 15° and lows near 9°, suitable for diverse activities and preferences.
How much rainfall should be expected in Ulster during September?
Significant rainfall exceeding 136 mm is expected in Ulster during September, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ulster during September?
The average wind speed in Ulster during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Ulster
Explore the daily rainfall trends and prepare for Ulsters September weather 💧
Typically, Ulster has 20 rainy days in September with a total of 136 mm of rainfall.
UV exposure in Ulster during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Ulster
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