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Weather in Ulster for September 2026

Your guide to Ulster weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Ulster is slightly cooler than the historical average by 1.1 °C.

  • The forecast for the next days in Ulster predicts temperatures to be around 16 °C, close to the historical average.

  • In general, the average temperature in Ulster at the beginning of September is 17.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.6 °C by the end of September.

    • Rain 🌧️

  • Ulster experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 127.5 mm.

Average dry days
2
Dry days
Average rainy days
28
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/8°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Ulster Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain shower
17°
2
Light rain shower
17°
3
Sunny
16°
4
Patchy rain possible
17°
5
Mist
18°
6
Light rain shower
21°
7
Partly cloudy
19°
8
Light rain shower
17°
9
Light rain shower
16°
10
Mist
15°
11
Light rain shower
13°
12
Light rain shower
14°
13
Moderate rain
14°
14
Overcast
15°
15
Overcast
14°
16
Patchy rain possible
13°
17
Patchy rain possible
12°
18
Patchy rain possible
14°
19
Patchy rain possible
14°
20
Patchy rain possible
16°
21
Sunny
20°
22
Sunny
20°
23
Fog
20°
24
Patchy rain possible
14°
25
Cloudy
17°
26
Sunny
17°
27
Patchy rain possible
14°
28
Patchy rain possible
13°
29
Patchy rain possible
13°
30
Light drizzle
14°

What’s the Weather Like in Ulster This September?

Discover the average temperatures and weather trends across Ulster’s cities this September.
Patchy rain possibleDonegal15 °C / 8 °CPatchy rain possibleCavan15 °C / 7 °CMore Locations

Temperatures trend during September in Ulster

See the weather trend as well as the moving average line

September weather in Ulster day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 17° /9° 5.8 mm 3
2 Sept. Light rain shower
Light rain shower
 17° /10° 3.1 mm 3
3 Sept. Sunny
Sunny
 16° /10° 2.6 mm 4
4 Sept. Patchy rain possible
Patchy rain possible
 17° /8° 1 mm 4
5 Sept. Mist
Mist
 18° /9° 0.3 mm 4
6 Sept. Light rain shower
Light rain shower
 21° /11° 1.6 mm 4
7 Sept. Partly cloudy
Partly cloudy
 19° /11° 2.4 mm 4
8 Sept. Light rain shower
Light rain shower
 17° /9° 3.3 mm 3
9 Sept. Light rain shower
Light rain shower
 16° /9° 1.6 mm 3
10 Sept. Mist
Mist
 15° /10° 8.6 mm 3
11 Sept. Light rain shower
Light rain shower
 13° /8° 6.2 mm 3
12 Sept. Light rain shower
Light rain shower
 14° /7° 7.6 mm 3
13 Sept. Moderate rain
Moderate rain
 14° /6° 7.6 mm 2
14 Sept. Overcast
Overcast
 15° /9° 6.7 mm 2
15 Sept. Overcast
Overcast
 14° /9° 6.2 mm 3
16 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 5.8 mm 2.4
17 Sept. Patchy rain possible
Patchy rain possible
 12° /10° 2.7 mm 2.3
18 Sept. Patchy rain possible
Patchy rain possible
 14° /11° 5.1 mm 0.4
19 Sept. Patchy rain possible
Patchy rain possible
 14° /10° 2.3 mm 2.7
20 Sept. Patchy rain possible
Patchy rain possible
 16° /8° 0.3 mm 4
21 Sept. Sunny
Sunny
 20° /13° 0 mm 5
22 Sept. Sunny
Sunny
 20° /12° 0 mm 5
23 Sept. Fog
Fog
 20° /11° 2.3 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 14° /7° 1.9 mm 3
25 Sept. Cloudy
Cloudy
 17° /6° 0 mm 5
26 Sept. Sunny
Sunny
 17° /9° 0.1 mm 5
27 Sept. Patchy rain possible
Patchy rain possible
 14° /10° 1.1 mm 3
28 Sept. Patchy rain possible
Patchy rain possible
 13° /11° 1.5 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 3 mm 3
30 Sept. Light drizzle
Light drizzle
 14° /8° 3.6 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.
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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 8°, suitable for diverse activities and preferences.

How much rainfall should be expected in Ulster during September?
Significant rainfall exceeding 127.5 mm is expected in Ulster during September, occurring over more than 28 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 20 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 28 rainy days in September with a total of 127.5 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
Select a province for an accurate weather forecast
An CabhánCounty Donegal
Top locations in Ulster
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CavanDonegal
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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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