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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.

  • Expect significant rainfall in Ulster during September, with an average of 20 rainy days.

  • Is September a good time to visit Ulster? check out the best time to travel to Ulster page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
10
Dry days
Average rainy days
20
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/9°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
85 %
Avg humidity

Ulster in September average weather

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Temperatures trend during September in Ulster

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
18° /9° 1 mm 4
2 Sept. Mist
Mist
17° /10° 4.7 mm 4
3 Sept. Sunny
Sunny
17° /9° 1.3 mm 5
4 Sept. Partly cloudy
Partly cloudy
18° /8° 1 mm 5
5 Sept. Mist
Mist
21° /10° 0 mm 5
6 Sept. Light rain shower
Light rain shower
23° /12° 1.4 mm 6
7 Sept. Partly cloudy
Partly cloudy
23° /13° 0.4 mm 6
8 Sept. Light rain shower
Light rain shower
20° /12° 3.8 mm 5
9 Sept. Light rain shower
Light rain shower
17° /10° 2.2 mm 4
10 Sept. Mist
Mist
16° /10° 2.9 mm 4
11 Sept. Light rain shower
Light rain shower
13° /7° 4.2 mm 4
12 Sept. Cloudy
Cloudy
13° /5° 1 mm 4
13 Sept. Moderate rain
Moderate rain
12° /4° 8.4 mm 3
14 Sept. Overcast
Overcast
14° /8° 1.1 mm 3
15 Sept. Overcast
Overcast
14° /8° 0.3 mm 4
16 Sept. Cloudy
Cloudy
16° /7° 0 mm 4
17 Sept. Light rain
Light rain
17° /10° 5.8 mm 5
18 Sept. Light rain shower
Light rain shower
16° /8° 4.8 mm 4
19 Sept. Light rain shower
Light rain shower
18° /8° 12.6 mm 5
20 Sept. Light rain shower
Light rain shower
18° /8° 6.6 mm 5
21 Sept. Light rain shower
Light rain shower
15° /7° 4.2 mm 4
22 Sept. Light rain shower
Light rain shower
16° /8° 2.6 mm 4
23 Sept. Patchy light rain
Patchy light rain
15° /6° 1.6 mm 4
24 Sept. Light rain shower
Light rain shower
14° /9° 5.9 mm 4
25 Sept. Light rain shower
Light rain shower
13° /8° 2.2 mm 4
26 Sept. Light rain shower
Light rain shower
11° /6° 10.4 mm 3
27 Sept. Light rain shower
Light rain shower
12° /6° 6.8 mm 3
28 Sept. Light rain
Light rain
13° /7° 2.7 mm 3
29 Sept. Light rain shower
Light rain shower
14° /7° 1.5 mm 3
30 Sept. Light drizzle
Light drizzle
13° /7° 2.9 mm 3
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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 9°. 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 154.8 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.

What to pack to Ulster in September?

As you prepare for your trip to Ulster 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 Ulster, 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 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 ☀️
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Location coordinates Where is Ulster?

Get accurate weather forecasts for Ulster, located at latitude 54.654 and longitude -8.111. Stay updated with localized weather information tailored for Ulster.

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