Weather in Ireland for September 2025
In general, the average temperature in Ireland 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 Ireland during September, with an average of 20 rainy days.
Is September a good time to visit Ireland? check out the best time to travel to Ireland page.
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Ireland in September average weather
| 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 Ireland
September weather day by day
| 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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Guide for Ireland in September
In September, Ireland experiences a transition from the late summer to early autumn, resulting in varied weather conditions throughout the month. At the beginning of September, the weather in Ireland is generally mild and pleasant, with average temperatures ranging from 14° to 17°.
The days are still relatively long, providing ample daylight for outdoor activities. However, occasional rain showers are common, so it's advisable for visitors to pack an umbrella or raincoat.
As the month progresses, the weather in Ireland gradually becomes cooler, with average temperatures dropping to 11° to 14°. The autumnal equinox occurs towards the end of September, marking the official start of autumn.
At this time, the days become noticeably shorter, and there is an increased likelihood of overcast skies and intermittent rainfall. Visitors should be prepared for cooler temperatures and the possibility of brisk winds, especially along the coastal areas.
Overall, September in Ireland offers a mix of mild temperatures, occasional rain, and the beautiful changing colors of the landscape as the season transitions from summer to autumn. It's a great time to explore the country's natural beauty and enjoy the unique charm of its cities and towns.
Ireland in September - FAQ
What to pack to Ireland in September?
As you prepare for your trip to Ireland 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 Ireland, 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
Quick links
Where is Ireland?Get accurate weather forecasts for Ireland, located at latitude 53.333 and longitude -6.249. Stay updated with localized weather information tailored for Ireland.