Ulster (Donegal)
September
Weather in Ulster for September 2025
Your guide to Ulster weather in September - trends and predictions
In general, the average temperature in Ulster 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.
Ulster 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
Ulster Weather September
Move between months or click on a day
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° |
You can click on date
Access Ulster weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Ulster
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
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 | |
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.
Ulster in September - FAQ
What are the expected maximum and minimum temperatures in Ulster 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 Ulster during September?
Significant rainfall exceeding 104.1 mm is expected in Ulster during September, occurring over more than 26 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 19 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 💧
UV exposure in Ulster during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Ulster
Select a province for an accurate weather forecast
Top locations in Ulster
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Get accurate weather forecasts for Ulster, located at latitude 54.654 and longitude -8.111. Stay updated with localized weather information tailored for Ulster.
Found a mistake?
We appreciate your attention to details. Tell us here.