Leinster (Dublin)
September
Weather in Leinster for September 2025
Your guide to Leinster weather in September - trends and predictions
In general, the average temperature in Leinster at the beginning of September is 17.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.3 °C by the end of September.
Expect significant rainfall in Leinster during September, with an average of 20 rainy days.
Is September a good time to visit Leinster? check out the best time to travel to Leinster page.
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10
Dry days
20
Rainy days
0
Snow days
17°/12°
Temperatures
24 km/h
Avg max wind
84 %
Avg humidity
Leinster in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2  17° | 3  18° | 4  17° | 5  17° | 6  19° | 7 19° |
| 8  19° | 9 18° | 10 16° | 11  15° | 12 14° | 13 15° | 14 17° |
| 15 14° | 16 16° | 17 16° | 18  15° | 19 16° | 20 16° | 21 15° |
| 22 14° | 23 15° | 24 15° | 25 14° | 26 14° | 27 14° | 28 15° |
| 29 14° | 30 14° |
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Temperatures trend during September in Leinster
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 17° /13° | 0.4 mm | 4 | |
| 2 Sept. | Cloudy | 17° /12° | 3.1 mm | 4 | |
| 3 Sept. | Overcast | 18° /11° | 0.3 mm | 4 | |
| 4 Sept. | Sunny | 17° /10° | 1.2 mm | 5 | |
| 5 Sept. | Mist | 17° /12° | 4.3 mm | 4 | |
| 6 Sept. | Partly cloudy | 19° /15° | 0 mm | 5 | |
| 7 Sept. | Light rain shower | 19° /14° | 4.1 mm | 5 | |
| 8 Sept. | Moderate or heavy rain shower | 19° /13° | 11 mm | 5 | |
| 9 Sept. | Patchy rain possible | 18° /12° | 1.1 mm | 5 | |
| 10 Sept. | Light rain shower | 16° /12° | 8.1 mm | 4 | |
| 11 Sept. | Moderate rain | 15° /11° | 8.2 mm | 4 | |
| 12 Sept. | Partly cloudy | 14° /7° | 0.2 mm | 4 | |
| 13 Sept. | Overcast | 15° /7° | 0.2 mm | 4 | |
| 14 Sept. | Overcast | 17° /10° | 3.6 mm | 5 | |
| 15 Sept. | Moderate rain | 14° /11° | 18.9 mm | 4 | |
| 16 Sept. | Light rain shower | 16° /10° | 3.3 mm | 4 | |
| 17 Sept. | Light rain shower | 16° /13° | 6.2 mm | 5 | |
| 18 Sept. | Light drizzle | 15° /11° | 0.2 mm | 4 | |
| 19 Sept. | Light rain shower | 16° /12° | 2.2 mm | 5 | |
| 20 Sept. | Patchy rain possible | 16° /11° | 1.2 mm | 4 | |
| 21 Sept. | Patchy rain possible | 15° /11° | 0.7 mm | 4 | |
| 22 Sept. | Light rain shower | 14° /10° | 3.3 mm | 3 | |
| 23 Sept. | Patchy rain possible | 15° /9° | 2.9 mm | 4 | |
| 24 Sept. | Light rain | 15° /11° | 3.8 mm | 4 | |
| 25 Sept. | Overcast | 14° /10° | 0 mm | 4 | |
| 26 Sept. | Light rain shower | 14° /10° | 4.6 mm | 4 | |
| 27 Sept. | Light rain shower | 14° /8° | 11.2 mm | 4 | |
| 28 Sept. | Light drizzle | 15° /9° | 1.4 mm | 4 | |
| 29 Sept. | Patchy rain possible | 14° /10° | 9.2 mm | 4 | |
| 30 Sept. | Moderate rain | 14° /9° | 10.6 mm | 4 | |
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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.
Leinster in September - FAQ
What are the expected maximum and minimum temperatures in Leinster during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 12°. 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 179.8 mm is expected in Leinster during September, occurring over more than 20 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 24 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Leinster in September?
As you prepare for your trip to Leinster in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Leinster, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Leinster
Explore the daily rainfall trends and prepare for Leinsters September weather 💧
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