Ireland weather in September 2025
Ireland weather in September 2025
Day
17 °C
Night
10 °C
Sea
15 °C
Precipitation
85 mm
in month
Rainy days
14 days
in month
Daylight
13 hours
average
Sunshine
4 hours
average
Humidity
85 %
Day
17 °C
Night
10 °C
Sea
15 °C
Precipitation
85 mm
in month
Rainy days
14 days
in month
Daylight
13 hours
average
Sunshine
4 hours
average
Humidity
85 %
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Weather overview and FAQs
Weather overview
In Ireland in September, the average air temperature ranges from 17 °C (63 °F) during the day to 10 °C (51 °F) at night. There are 14 days of rain on average, where the rainfall is 85 mm (3.36 in).
Is September a good month to visit Ireland?
Ireland can be visited in September - the weather will be moderate. A relatively low temperature of 17 °C (63 °F) may be ideal for walking or outdoor activities, but some people may have a different idea of the holiday. The temperature of 10 °C (51 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
What is the air temperature in Ireland in September at night?
The average night temperature in Ireland in September is 10 °C (51 °F). Nights can be cooler, morning running can be refreshing but choose appropriate clothing, evening outdoor sitting can be pleasant but you can also be cold.
What temperature can I expect during the day in September in Ireland?
In Ireland in September, the average daily temperatures will be 17 °C (63 °F). Nice temperature for walking around the city or on the beach, but you will probably get cold soon when wearing a swimsuit. When walking around all day, people used to cold conditions, pull out their shorts and get rid of their sweaters. On some days, when spending time in the direct sun, sunscreen can be useful, especially for people with more sensitive skin.
How many rainy days can I expect in September in Ireland?
There are 14 days, which are rainy in September in Ireland, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 3.2 days of the week, or in general - 45 % days.
Is Ireland rainier in September than in August?
No, September in Ireland is not a rainier month than August.
What is the rainfall intensity in September in Ireland?
In Ireland in September, there is 85 mm (3.36 in) rainfall, which means on average 3 mm (0.11 in) rainfall per day.
Is the weather in Ireland warmer in September than in August?
No, in September in Ireland the temperature is not higher than in August.
How many sunny hours can I expect in Ireland in September?
In September in Ireland, you can expect around 4 hours of sunshine.
What is the temperature trend in September in Ireland?
During September in Ireland, the day temperatures are decreasing - from 18 °C (65 °F) at the beginning of the month to 16 °C (60 °F) at the end of the month.
How long is the day (from dawn till dusk) in Ireland in September?
The length of daylight in Ireland in September is 13 hours.
How windy is Ireland in September?
In Ireland in September, there will be an average wind scale of 4.
How humid is Ireland in September?
Humidity in Ireland in September is 85 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.