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Weather in Portlaoise for September 2026

Your guide to Portlaoise weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in Portlaoise is slightly warmer than the historical average by 1.2 °C.

  • The forecast for the next days in Portlaoise predicts temperatures to be around 17 °C, close to the historical average.

  • In general, the average temperature in Portlaoise at the beginning of September is 17.4 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 15.7 °C by the end of September.

    • Rain 🌧️

  • Portlaoise experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 96 mm.

Average dry days
8
Dry days
Average rainy days
22
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/7°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Portlaoise 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
Patchy rain possible
20°
3
Moderate rain
16°
4
Light rain shower
17°
5
Patchy rain possible
17°
6
Patchy rain possible
19°
7
Light rain shower
16°
8
Patchy rain possible
15°
9
Overcast
16°
10
Moderate rain at times
15°
11
Moderate rain at times
14°
12
Patchy rain possible
16°
13
Overcast
15°
14
Moderate rain at times
19°
15
Patchy rain possible
15°
16
Overcast
16°
17
Patchy rain possible
15°
18
Overcast
15°
19
Patchy rain possible
16°
20
Mist
19°
21
Sunny
22°
22
Sunny
21°
23
Mist
19°
24
Patchy rain possible
14°
25
Partly cloudy
18°
26
Sunny
19°
27
Overcast
17°
28
Overcast
16°
29
Overcast
13°
30
Light rain shower
13°

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
 17° /9° 1.9 mm 3
2 Sept. Patchy rain possible
Patchy rain possible
 20° /9° 6.3 mm 3
3 Sept. Moderate rain
Moderate rain
 16° /11° 13.9 mm 2
4 Sept. Light rain shower
Light rain shower
 17° /9° 0.8 mm 3
5 Sept. Patchy rain possible
Patchy rain possible
 17° /8° 0.4 mm 3
6 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 0.7 mm 3
7 Sept. Light rain shower
Light rain shower
 16° /8° 4.1 mm 3
8 Sept. Patchy rain possible
Patchy rain possible
 15° /7° 0.4 mm 4
9 Sept. Overcast
Overcast
 16° /8° 1.5 mm 4
10 Sept. Moderate rain at times
Moderate rain at times
 15° /9° 2.7 mm 3
11 Sept. Moderate rain at times
Moderate rain at times
 14° /8° 1.9 mm 3
12 Sept. Patchy rain possible
Patchy rain possible
 16° /7° 2.7 mm 2
13 Sept. Overcast
Overcast
 15° /7° 3.6 mm 2
14 Sept. Moderate rain at times
Moderate rain at times
 19° /10° 3.1 mm 3
15 Sept. Patchy rain possible
Patchy rain possible
 15° /9° 3.2 mm 4
16 Sept. Overcast
Overcast
 16° /10° 0.1 mm 2.7
17 Sept. Patchy rain possible
Patchy rain possible
 15° /10° 1.2 mm 2.8
18 Sept. Overcast
Overcast
 15° /10° 1.9 mm 0.6
19 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 0.7 mm 3
20 Sept. Mist
Mist
 19° /9° 0.1 mm 4
21 Sept. Sunny
Sunny
 22° /15° 0 mm 6
22 Sept. Sunny
Sunny
 21° /14° 0 mm 6
23 Sept. Mist
Mist
 19° /13° 0 mm 5
24 Sept. Patchy rain possible
Patchy rain possible
 14° /9° 0 mm 3
25 Sept. Partly cloudy
Partly cloudy
 18° /7° 0 mm 5
26 Sept. Sunny
Sunny
 19° /9° 0 mm 5
27 Sept. Overcast
Overcast
 17° /9° 0 mm 4
28 Sept. Overcast
Overcast
 16° /9° 0.6 mm 5
29 Sept. Overcast
Overcast
 13° /10° 0.8 mm 3
30 Sept. Light rain shower
Light rain shower
 13° /7° 3.5 mm 4
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 7°, 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 96 mm spread over approximately 22 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 20 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 💧
Typically, Portlaoise has 22 rainy days in September with a total of 96 mm of rainfall.

UV exposure in Portlaoise during September

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

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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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