The weather in September in Ireland
It's cool to moderate in September in Ireland with an average temperature of 17°C. Temperatures this month range from a low of 15°C to a high of 19°C. At night, you can expect temperatures between 8°C and 12°C.
Looking for sun and warm weather? September isn’t a good month to be in Ireland. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Ireland. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 27°C in 2023, Ireland reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 10°C in 2018. The extreme nighttime temperatures ranged from a lowest recorded value of 0°C to a highest value of 17°C.
Rainfall amount
In September, there is an average of 63 mm of precipitation, spread over 9 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Ireland
Click on any day in September to get detailed info about the usual weather on that day in Ireland. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Ireland | New York | |
|---|---|---|
| Average temperature | 17°C | 27°C |
| Max. temperature | 19°C | 31°C |
| Min. temperature | 8°C | -5°C |
| Total precipitation | 63 mm | 57 mm |
| Rainy days | 9 days | 9 days |
Start of September
The month of September starts in Ireland with mild temps, averaging around 18°C during the day and nights around 12°C.
Mid September
By mid-September, daytime temps drop to around 17°C, with nights around 11°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Ireland is around 16°C, while nighttime temps are about 9°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Ireland for all months and discover the best travel time
You can check out all destinations in Ireland to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in Ireland. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Ireland
Temperature in September in Ireland over the years
Precipitation charts
These charts show the average amount of precipitation in September in Ireland. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Ireland
Total precipitation in September in Ireland over the years
Daily UV index in September in Ireland
This chart shows the average daily UV index in September in Ireland, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Ireland
The weather in September in Ireland is rated 3 out of 5 stars by 1 visitor. Have you been to Ireland? Share your weather experience to help other visitors.
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September in Ireland is mild, but you can expect rainy days and scant sunshine. The temperature hovers around 15 degrees. Not ideal for sun worshippers but ideal for nature lovers.— This text is automatically translated to English
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Average weather in Ireland by month
Click on a month below to see detailed weather info for Ireland. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.