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Weather in Portlaoise for September 2025

Your guide to Portlaoise weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Portlaoise has been nearly identical to the historical average, with a temperature of 15.6 °C (showing only a slight deviation of 0.2 °C).

  • The forecast for the next days in Portlaoise predicts temperatures to be around 15 °C, close to the historical average.

  • In general, the average temperature in Portlaoise at the beginning of September is 16.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.6 °C by the end of September.

    • Rain 🌧️

  • Portlaoise in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 82.6 mm.

Average dry days
13
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/8°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
83 %
Avg humidity

Portlaoise Weather September

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

Temperatures trend during September in Portlaoise

See the weather trend as well as the moving average line

September weather in Portlaoise 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
 15° /9° 3.2 mm 4
2 Sept. Patchy rain possible
Patchy rain possible
 18° /7° 0 mm 4
3 Sept. Moderate rain
Moderate rain
 14° /10° 23.2 mm 3
4 Sept. Light rain shower
Light rain shower
 17° /8° 1.1 mm 4
5 Sept. Patchy rain possible
Patchy rain possible
 17° /8° 0 mm 4
6 Sept. Patchy rain possible
Patchy rain possible
 18° /10° 0.2 mm 4
7 Sept. Light rain shower
Light rain shower
 15° /7° 2.2 mm 4
8 Sept. Patchy rain possible
Patchy rain possible
 16° /6° 0.2 mm 4
9 Sept. Overcast
Overcast
 16° /9° 2.2 mm 4
10 Sept. Moderate rain at times
Moderate rain at times
 14° /9° 2.8 mm 4
11 Sept. Moderate rain at times
Moderate rain at times
 12° /7° 2.8 mm 3
12 Sept. Patchy rain possible
Patchy rain possible
 13° /5° 1.7 mm 3
13 Sept. Overcast
Overcast
 12° /2° 0 mm 3
14 Sept. Moderate rain
Moderate rain
 17° /7° 6 mm 0.3
15 Sept. Patchy rain possible
Patchy rain possible
 14° /11° 4.7 mm 0.5
16 Sept. Moderate rain
Moderate rain
 15° /9° 5.1 mm 0.8
17 Sept. Moderate rain
Moderate rain
 17° /10° 5.4 mm 0.7
18 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 0.1 mm 0.7
19 Sept. Partly cloudy
Partly cloudy
 17° /9° 0 mm 4
20 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.8 mm 3
21 Sept. Patchy rain possible
Patchy rain possible
 12° /10° 1.8 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 14° /8° 0 mm 3
23 Sept. Sunny
Sunny
 14° /4° 0 mm 3
24 Sept. Overcast
Overcast
 14° /5° 0 mm 2
25 Sept. Patchy rain possible
Patchy rain possible
 14° /8° 0.7 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 13° /4° 0.2 mm 2
27 Sept. Patchy rain possible
Patchy rain possible
 12° /7° 1.9 mm 2
28 Sept. Patchy rain possible
Patchy rain possible
 12° /3° 0.1 mm 3
29 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /7° 6.7 mm 3
30 Sept. Light rain shower
Light rain shower
 11° /6° 4.9 mm 3
Next
Important Notice
Our weather forecast for Portlaoise 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 Portlaoise forecast closer to your planned date for the most up-to-date weather information.
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Portlaoise in September - FAQ

What are the expected maximum and minimum temperatures in Portlaoise 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 Portlaoise during September?
Moderate rainfall is anticipated in Portlaoise during September, with a total of 82.6 mm spread over approximately 17 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Portlaoise during September?
The average wind speed in Portlaoise during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Portlaoise

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

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Location coordinates Where is Portlaoise?

Get accurate weather forecasts for Portlaoise, located at latitude 53.034 and longitude -7.3. Stay updated with localized weather information tailored for Portlaoise.

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