Ireland weather in September
Ireland in September averages 13°C (56°F), 65 mm of rain and 3.6 hours of sun a day.
Of the twelve months in Ireland, September is the fourth warmest, the fifth driest and the sixth sunniest.
- Average temp
- 13°C (56°F)
9–17°C · 49–63°F
- Rainfall
- 65 mm
Showers likely
- Sunshine
- 3.6 h
hours per day
- Wind
- 17 km/h
What is Ireland like in September?
Daytime
Days are cool.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Ireland in September?
A light rain jacket
About 65 mm falls this month — showers rather than washouts.
A warm mid-layer
Nights drop to around 9°C (49°F).
September compared with August and October
September in Ireland is 2.1°C cooler than August and about as wet as it, which averages 15°C (60°F).
September in Ireland is 3.3°C warmer than October and 31 mm drier than it, which averages 10°C (50°F).
Daylight in Ireland in September
On 15 September the sun is up for 12 hours 40 minutes in Ireland, rising about 07:07 and setting about 19:47 local time.
September ends 2 hours 1 minute shorter than it begins, so the last week of the month is a different length of day from the first.
That is 4 hours 20 minutes short of June, the longest-lit month here.
Travel guides for Ireland
What to read before you book.
Ireland weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 6°C / 42°F | 82 mm |
| February | 6°C / 42°F | 63 mm |
| March | 7°C / 45°F | 60 mm |
| April | 9°C / 47°F | 69 mm |
| May | 11°C / 52°F | 56 mm |
| June | 14°C / 57°F | 70 mm |
| July | 15°C / 60°F | 59 mm |
| August | 15°C / 60°F | 70 mm |
| September | 13°C / 56°F | 65 mm |
| October | 10°C / 50°F | 96 mm |
| November | 8°C / 46°F | 82 mm |
| December | 6°C / 42°F | 80 mm |
Similar weather in September
Other destinations whose September averages sit close to this one.
Check another month
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FAQs about Ireland in September
September climate averages for Ireland, 1991–2020.
Ireland averages 13°C (56°F) in September, ranging from about 9°C (49°F) at night to 17°C (63°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 65 mm falls across September, enough to need a light jacket but not enough to reshape a trip.
Yes. September averages 13°C (56°F) against 10°C (50°F) in October — 3.3°C warmer.
September is 2.1°C cooler than August, and about as wet.
Yes. September falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 3.6 hours of sun a day on the 1991–2020 average, so daylight is short on useful sun.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 40 minutes of daylight in mid-September, against 17 hours in June and 7 hours 31 minutes in December.
On 15 September, sunrise is about 07:07 and sunset about 19:47 local time. Both shift across the month — the month ends 2 hours 1 minute shorter than it starts.
