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 17.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 14.7 °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.
Is September a good time to visit Leinster? check out the best time to travel to Leinster page.
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Temperatures
Rain 🌧️
More
6
Dry days
24
Rainy days
0
Snow days
16°/11°
Temperatures
21 km/h
Avg max wind
83 %
Avg humidity
Leinster in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2  17° | 3 17° | 4 17° | 5 17° | 6  19° | 7 19° |
| 8  19° | 9 18° | 10 17° | 11 16° | 12 15° | 13  16° | 14 17° |
| 15 15° | 16 16° | 17 16° | 18  16° | 19 16° | 20 16° | 21 16° |
| 22 15° | 23 15° | 24 16° | 25 15° | 26 15° | 27 14° | 28 14° |
| 29 14° | 30 15° |
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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. | Patchy rain possible | 17° /12° | 0.5 mm | 4 | |
| 2 Sept. | Sunny | 17° /12° | 2.3 mm | 4 | |
| 3 Sept. | Sunny | 17° /11° | 6.1 mm | 4 | |
| 4 Sept. | Patchy rain possible | 17° /11° | 7.3 mm | 4 | |
| 5 Sept. | Patchy rain possible | 17° /12° | 5.1 mm | 4 | |
| 6 Sept. | Partly cloudy | 19° /14° | 1.7 mm | 5 | |
| 7 Sept. | Sunny | 19° /14° | 3.3 mm | 5 | |
| 8 Sept. | Cloudy | 19° /13° | 7.5 mm | 5 | |
| 9 Sept. | Patchy rain possible | 18° /12° | 7.4 mm | 4 | |
| 10 Sept. | Patchy rain possible | 17° /12° | 4.3 mm | 4 | |
| 11 Sept. | Patchy rain possible | 16° /12° | 9.6 mm | 4 | |
| 12 Sept. | Patchy rain possible | 15° /10° | 1 mm | 4 | |
| 13 Sept. | Moderate or heavy rain shower | 16° /9° | 1.3 mm | 4 | |
| 14 Sept. | Patchy rain possible | 17° /10° | 1.8 mm | 4 | |
| 15 Sept. | Patchy rain possible | 15° /11° | 9.7 mm | 4 | |
| 16 Sept. | Patchy rain possible | 16° /9° | 2 mm | 4 | |
| 17 Sept. | Sunny | 16° /11° | 4.9 mm | 5 | |
| 18 Sept. | Overcast | 16° /10° | 0.1 mm | 4 | |
| 19 Sept. | Patchy rain possible | 16° /11° | 1.9 mm | 4 | |
| 20 Sept. | Overcast | 16° /10° | 0.6 mm | 4 | |
| 21 Sept. | Partly cloudy | 16° /11° | 0.4 mm | 4 | |
| 22 Sept. | Light rain shower | 15° /11° | 6 mm | 4 | |
| 23 Sept. | Patchy rain possible | 15° /10° | 1.7 mm | 4 | |
| 24 Sept. | Overcast | 16° /10° | 1.9 mm | 4 | |
| 25 Sept. | Overcast | 15° /10° | 0.1 mm | 4 | |
| 26 Sept. | Light rain shower | 15° /9° | 4.9 mm | 4 | |
| 27 Sept. | Patchy rain possible | 14° /9° | 7.2 mm | 3 | |
| 28 Sept. | Patchy rain possible | 14° /8° | 0.9 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 | |
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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 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.
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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