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Weather in Donegal for September 2025

Your guide to Donegal weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Donegal is cooler than usual, with temperatures averaging 14.5 °C, this is -2.2 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Donegal with the forecast suggesting a temperature of 13.7 °C, lower than the historical average.

  • In general, the average temperature in Donegal at the beginning of September is 18.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °C by the end of September.

    • Rain 🌧️

  • Donegal experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 104.1 mm.

Average dry days
4
Dry days
Average rainy days
26
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/8°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
83 %
Avg humidity

Donegal Weather September

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

Temperatures trend during September in Donegal

See the weather trend as well as the moving average line

September weather in Donegal 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° 6.8 mm 4
2 Sept. Light rain shower
Light rain shower
 17° /9° 3.5 mm 4
3 Sept. Sunny
Sunny
 17° /9° 1.4 mm 4
4 Sept. Partly cloudy
Partly cloudy
 18° /8° 0.8 mm 4
5 Sept. Mist
Mist
 19° /9° 0.2 mm 4
6 Sept. Light rain shower
Light rain shower
 21° /11° 1.4 mm 5
7 Sept. Partly cloudy
Partly cloudy
 21° /11° 1.9 mm 5
8 Sept. Light rain shower
Light rain shower
 18° /10° 3.2 mm 4
9 Sept. Light rain shower
Light rain shower
 16° /10° 2 mm 4
10 Sept. Mist
Mist
 15° /10° 8.4 mm 4
11 Sept. Light rain shower
Light rain shower
 13° /8° 8 mm 3
12 Sept. Light rain shower
Light rain shower
 13° /6° 5.3 mm 3
13 Sept. Moderate rain
Moderate rain
 12° /5° 10 mm 3
14 Sept. Overcast
Overcast
 14° /8° 1.1 mm 3
15 Sept. Moderate rain
Moderate rain
 15° /11° 12.5 mm 0.5
16 Sept. Patchy rain possible
Patchy rain possible
 15° /10° 4.5 mm 0.8
17 Sept. Moderate rain
Moderate rain
 16° /10° 10.2 mm 0.7
18 Sept. Moderate rain
Moderate rain
 16° /11° 10 mm 0.7
19 Sept. Patchy rain possible
Patchy rain possible
 15° /10° 2.6 mm 0.6
20 Sept. Patchy rain possible
Patchy rain possible
 10° /9° 0.2 mm 2
21 Sept. Patchy rain possible
Patchy rain possible
 9° /7° 4 mm 2
22 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 0.1 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 15° /9° 0.5 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 4.1 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 0.7 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 15° /8° 2.8 mm 3
27 Sept. Patchy rain possible
Patchy rain possible
 14° /10° 2.5 mm 3
28 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 3.3 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
Next
Important Notice
Our weather forecast for Donegal 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 Donegal forecast closer to your planned date for the most up-to-date weather information.
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Donegal in September - FAQ

What are the expected maximum and minimum temperatures in Donegal 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 Donegal during September?
Significant rainfall exceeding 104.1 mm is expected in Donegal during September, occurring over more than 26 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Donegal during September?
The average wind speed in Donegal during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Donegal

Explore the daily rainfall trends and prepare for Donegals September weather 💧

UV exposure in Donegal during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Donegal?

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

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