Leinster (Dublin)
September
Weather in Leinster for September 2025
Your guide to Leinster weather in September - trends and predictions
Yellow Wind Warning - See hour by hour.
Until now, September 2025 in Leinster is slightly cooler than the historical average by -1.5 °C.
Expect cooler weather in the next days in Leinster with the forecast suggesting a temperature of 15.4 °C, lower than the historical average.
In general, the average temperature in Leinster at the beginning of September is 17.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.6 °C by the end of September.
Leinster experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 116.4 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
6
Dry days
24
Rainy days
0
Snow days
16°/11°
Temperatures
21 km/h
Avg max wind
83 %
Avg humidity
Leinster Weather September
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What’s the Weather Like in Leinster This September?
Discover the average temperatures and weather trends across Leinster’s cities this September.
Temperatures trend during September in Leinster
See the weather trend as well as the moving average line
September weather in Leinster day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 17° /12° | 0.5 mm | 4 | |
| 2 Sept. |  Sunny | 17° /11° | 1.8 mm | 4 | |
| 3 Sept. | Sunny | 17° /11° | 11.8 mm | 4 | |
| 4 Sept. | Light rain shower | 17° /11° | 6.2 mm | 4 | |
| 5 Sept. | Patchy rain possible | 17° /11° | 4.1 mm | 4 | |
| 6 Sept. |  Partly cloudy | 19° /14° | 1.4 mm | 5 | |
| 7 Sept. | Light rain shower | 19° /13° | 3.4 mm | 5 | |
| 8 Sept. |  Cloudy | 18° /12° | 6.9 mm | 4 | |
| 9 Sept. | Patchy rain possible | 17° /12° | 6.4 mm | 4 | |
| 10 Sept. | Light rain shower | 17° /12° | 4.3 mm | 4 | |
| 11 Sept. | Light rain shower | 16° /11° | 8.5 mm | 4 | |
| 12 Sept. | Patchy rain possible | 15° /10° | 1.4 mm | 4 | |
| 13 Sept. |  Moderate or heavy rain shower | 15° /9° | 1.7 mm | 4 | |
| 14 Sept. | Patchy rain possible | 17° /10° | 2.7 mm | 4 | |
| 15 Sept. |  Moderate rain | 14° /11° | 6 mm | 0.3 | |
| 16 Sept. | Patchy rain possible | 16° /8° | 0.8 mm | 0.8 | |
| 17 Sept. | Moderate rain | 20° /11° | 9.1 mm | 0.6 | |
| 18 Sept. | Patchy rain possible | 20° /14° | 1.3 mm | 0.2 | |
| 19 Sept. | Patchy rain possible | 18° /10° | 2.4 mm | 0.6 | |
| 20 Sept. | Moderate rain | 12° /11° | 13.1 mm | 3 | |
| 21 Sept. | Moderate rain | 12° /11° | 8.6 mm | 3 | |
| 22 Sept. | Patchy rain possible | 15° /12° | 1.6 mm | 3 | |
| 23 Sept. | Patchy rain possible | 16° /10° | 0.2 mm | 3 | |
| 24 Sept. | Patchy rain possible | 12° /9° | 2.1 mm | 3 | |
| 25 Sept. | Partly cloudy | 16° /8° | 0 mm | 4 | |
| 26 Sept. | Patchy rain possible | 16° /7° | 0.3 mm | 3 | |
| 27 Sept. | Patchy rain possible | 16° /11° | 0.4 mm | 3 | |
| 28 Sept. | Patchy rain possible | 13° /8° | 0.4 mm | 3 | |
| 29 Sept. | Patchy rain possible | 14° /8° | 5 mm | 3 | |
| 30 Sept. | Moderate or heavy rain shower | 15° /9° | 9.7 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Leinster 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 Leinster forecast closer to your planned date for the most up-to-date weather information.
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Leinster in September - FAQ
What are the expected maximum and minimum temperatures in Leinster during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Leinster during September?
Significant rainfall exceeding 116.4 mm is expected in Leinster during September, occurring over more than 24 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Leinster during September?
The average wind speed in Leinster during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Leinster
Explore the daily rainfall trends and prepare for Leinsters September weather 💧
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