Weather in Ireland for September 2027
In general, the average temperature in Ireland at the beginning of September is 17.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 14.8 °C by the end of September.
The climate of Ireland in September is notably wet, with an average of 15 rainy days, and a total of 115.8 mm of precipitation.
Is September a good time to visit Ireland? check out the best time to travel to Ireland page.
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Ireland Weather September
What’s the Weather Like in Ireland This September?
Temperatures trend during September in Ireland
September weather in Ireland day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 17° /12° | 0.4 mm | 4 | |
| 2 Sept. |  Light rain | 17° /12° | 2.8 mm | 4 | |
| 3 Sept. |  Moderate rain | 17° /12° | 10.4 mm | 4 | |
| 4 Sept. | Light rain | 17° /11° | 5.3 mm | 4 | |
| 5 Sept. | Light rain | 17° /11° | 3.4 mm | 4 | |
| 6 Sept. | Patchy rain possible | 19° /14° | 1.5 mm | 4 | |
| 7 Sept. | Light rain | 18° /13° | 3.5 mm | 4 | |
| 8 Sept. | Light rain | 17° /12° | 5.9 mm | 4 | |
| 9 Sept. | Light rain | 17° /11° | 5.3 mm | 4 | |
| 10 Sept. | Light rain | 17° /12° | 3.8 mm | 3 | |
| 11 Sept. | Light rain | 16° /12° | 7.1 mm | 4 | |
| 12 Sept. | Patchy rain possible | 15° /10° | 2 mm | 3 | |
| 13 Sept. | Patchy rain possible | 16° /10° | 1.6 mm | 3 | |
| 14 Sept. | Light rain | 18° /11° | 2.7 mm | 4 | |
| 15 Sept. | Light rain | 15° /11° | 7.2 mm | 3 | |
| 16 Sept. | Patchy rain possible | 16° /10° | 1.4 mm | 4 | |
| 17 Sept. | Light rain | 16° /11° | 5.2 mm | 3.9 | |
| 18 Sept. | Patchy rain possible | 16° /11° | 1.8 mm | 3 | |
| 19 Sept. | Light rain | 16° /11° | 3.6 mm | 3.7 | |
| 20 Sept. | Light rain | 16° /10° | 3.5 mm | 3 | |
| 21 Sept. | Patchy rain possible | 16° /11° | 0.7 mm | 3.5 | |
| 22 Sept. | Light rain | 15° /11° | 4.3 mm | 3 | |
| 23 Sept. | Patchy rain possible | 15° /9° | 1.4 mm | 3 | |
| 24 Sept. | Patchy rain possible | 16° /10° | 1.3 mm | 3 | |
| 25 Sept. |  Overcast | 15° /10° | 0.4 mm | 3 | |
| 26 Sept. | Light rain | 15° /10° | 3.3 mm | 3.1 | |
| 27 Sept. | Moderate rain | 14° /9° | 10.7 mm | 3 | |
| 28 Sept. | Patchy rain possible | 14° /8° | 0.7 mm | 3 | |
| 29 Sept. | Light rain | 14° /9° | 5.9 mm | 2.9 | |
| 30 Sept. |  Moderate or heavy rain shower | 15° /10° | 8.8 mm | 2.8 | |
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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.