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Weather in September in Ireland

Are you planning a trip a to Ireland in September and wondering what kind of weather to expect? This page has all the details you need.

What is the weather like in Ireland in September?

September in Ireland generally has temperatures that range from moderate to pleasant, with precipitation levels ranging from moderate to high.

Temperatures

During the day the temperature is moderate in Greencastle at 16°C and pleasant in Drogheda at 18°C. As night falls, temperatures generally drop to 11°C in Drogheda and 12°C in Greencastle.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Kilkenny with an average of 69 mm to high rainfall in Kincasslagh with 144 mm.

Average sunshine

Dublin enjoys a balanced 128 hours of sunlight. Ensuring it's neither too overcast nor too sunny.

To learn more about the conditions in specific areas of Ireland in September, check out the map below. For more details on the yearly weather, visit our Ireland climate page.

Where to go in Ireland in September

Find more information for the most popular destinations in the Ireland on the map below. Click on a destination dot for more detailes.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations

What is the weather like in September for the 5 most popular destinations in Ireland?

Dublin

In September Dublin generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 11°C and moderate monthly rainfall. So on average the conditions are pleasant that month.

Dublin
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
20°C 
13°C 
157 hours 
81 mm 
16 days 
18°C 
11°C 
128 hours 
74 mm 
15 days 
October   >> October
>>  
15°C 
9°C 
97 hours 
79 mm 
17 days 
Climate in Dublin

Killarney

In September Killarney generally has moderate temperatures with maximum daytime temperatures around 17°C, minimum nighttime temperatures around 10°C and moderate monthly rainfall. So on average the conditions are tolerable that month.

Killarney
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
11°C 
139 hours 
102 mm 
20 days 
17°C 
10°C 
118 hours 
93 mm 
19 days 
October   >> October
>>  
14°C 
7°C 
82 hours 
114 mm 
22 days 
Climate in Killarney

Galway

In September Galway generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 10°C and moderate monthly rainfall. So on average the conditions are pleasant that month.

Galway
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
12°C 
118 hours 
100 mm 
20 days 
18°C 
10°C 
93 hours 
86 mm 
20 days 
October   >> October
>>  
15°C 
8°C 
74 hours 
104 mm 
21 days 
Climate in Galway

Kenmare

In September Kenmare generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 10°C and moderate monthly rainfall. So on average the conditions are tolerable that month.

Kenmare
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
11°C 
139 hours 
107 mm 
20 days 
18°C 
10°C 
118 hours 
100 mm 
19 days 
October   >> October
>>  
14°C 
7°C 
82 hours 
125 mm 
22 days 
Climate in Kenmare

Cork

In September Cork generally has moderate temperatures with maximum daytime temperatures around 18°C, minimum nighttime temperatures around 12°C and moderate monthly rainfall. So on average the conditions are pleasant that month.

Cork
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
19°C 
13°C 
160 hours 
79 mm 
18 days 
18°C 
12°C 
128 hours 
77 mm 
17 days 
October   >> October
>>  
15°C 
9°C 
92 hours 
102 mm 
19 days 
Climate in Cork

Is your destination not in the list? Have a look at other destinations in Ireland.

Is September the best time to visit Ireland?

In our opinion, September is a good time to visit Ireland with overall pleasant weather in Dublin. It's worth noting that weather conditions might differ depending on the location you visit.

On average, the best time to visit Ireland is in July and August with generally perfect weather in Dublin. On the other hand, the weather in January, February and December tend to be poor.

Interested in more climate information?

We have much more information about the climate in Ireland. Interested in the weather conditions in a specific month? Select the month below.

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  • Weather and climate has detailed information for every country in the world. Are you going to Ireland? Get detailed historical weather averages for many cities in Ireland.

    Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.