Dublin

Ireland Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Ireland in September.

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Dublin Killarney Galway Cork

Planning a trip to Ireland this September? Here's what you need to know about the weather:

What to Expect in Ireland in September

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

Temperatures

During the day the temperature is mild in Greencastle at 16°C (61°F) and pleasant in Drogheda at 18°C (64°F). As night falls, temperatures generally drop to 11°C (52°F) in Drogheda and 12°C (54°F) in Greencastle.

For a closer look at conditions across Ireland, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Kilkenny with an average of 69 mm (2.7 in) to high rainfall in Kincasslagh with 144 mm (5.7 in).

Average sunshine

Most areas see decent amounts of sunshine this month. Dublin gets around 128 hours of sunlight, providing a pleasant balance of sun and clouds. If you'd prefer more guaranteed sunshine, our weather planner can show you sunnier spots around the world.

Explore Ireland by month

Pick a month to see the average temperature, rainfall and sunshine in Ireland — and find the best time to visit. (based on Dublin)

January9°C (48°F) February10°C (50°F) March11°C (52°F) April13°C (55°F) May16°C (61°F) June18°C (64°F) This monthJuly20°C (68°F) August20°C (68°F) September18°C (64°F) October15°C (59°F) November12°C (54°F) December10°C (50°F)
Best Time to Visit Ireland →

Best Places to Visit in Ireland in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Ireland.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Ireland

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

Temperature range in Ireland (September)

Precipitation variation in Ireland (September)

Dublin

In September Dublin generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 11°C (52°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
20°C (68°F)
18°C (64°F)
15°C (59°F)
Min temperature
13°C (55°F)
11°C (52°F)
9°C (48°F)
Monthly sun hours
157 hours
128 hours
97 hours
Monthly rainfall
81 mm (3.2 in)
74 mm (2.9 in)
79 mm (3.1 in)
Monthly rainy days
16 days
15 days
17 days
Weather conditions
perfect
pleasant
tolerable
Climate in Dublin →

Killarney

In September Killarney generally has moderate temperatures with maximum daytime temperatures around 17°C (63°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are tolerable that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
17°C (63°F)
14°C (57°F)
Min temperature
11°C (52°F)
10°C (50°F)
7°C (45°F)
Monthly sun hours
139 hours
118 hours
82 hours
Monthly rainfall
102 mm (4 in)
93 mm (3.7 in)
114 mm (4.5 in)
Monthly rainy days
20 days
19 days
22 days
Weather conditions
tolerable
tolerable
unpleasant
Climate in Killarney →

Galway

In September Galway generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
15°C (59°F)
Min temperature
12°C (54°F)
10°C (50°F)
8°C (46°F)
Monthly sun hours
118 hours
93 hours
74 hours
Monthly rainfall
100 mm (3.9 in)
86 mm (3.4 in)
104 mm (4.1 in)
Monthly rainy days
20 days
20 days
21 days
Weather conditions
tolerable
pleasant
unpleasant
Climate in Galway →

Kenmare

In September Kenmare generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are tolerable that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
14°C (57°F)
Min temperature
11°C (52°F)
10°C (50°F)
7°C (45°F)
Monthly sun hours
139 hours
118 hours
82 hours
Monthly rainfall
107 mm (4.2 in)
100 mm (3.9 in)
125 mm (4.9 in)
Monthly rainy days
20 days
19 days
22 days
Weather conditions
tolerable
tolerable
unpleasant
Climate in Kenmare →

Cork

In September Cork generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 12°C (54°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
15°C (59°F)
Min temperature
13°C (55°F)
12°C (54°F)
9°C (48°F)
Monthly sun hours
160 hours
128 hours
92 hours
Monthly rainfall
79 mm (3.1 in)
77 mm (3 in)
102 mm (4 in)
Monthly rainy days
18 days
17 days
19 days
Weather conditions
pleasant
pleasant
unpleasant
Climate in Cork →

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

Popular cities in September

Day & night temperatures, rainfall and average weather in Ireland in September.

City Weather Day temp Night temp Rainfall
Dublin 18°C (64°F) 11°C (52°F) 74 mm (2.9 in)
Killarney 17°C (63°F) 10°C (50°F) 93 mm (3.7 in)
Galway 18°C (64°F) 10°C (50°F) 86 mm (3.4 in)
Cork 18°C (64°F) 12°C (54°F) 77 mm (3 in)
Doolin 17°C (63°F) 12°C (54°F) 132 mm (5.2 in)
Rosslare 17°C (63°F) 14°C (57°F) 81 mm (3.2 in)

Ireland weather in September: frequently asked questions

What is the weather like in Ireland in September?

Expect pleasant weather across Ireland in September. The popular destination of Dublin averages 18°C (64°F) by day and 11°C (52°F) at night during this month.

What is the average temperature in Ireland in September?

Dublin averages a daytime maximum of 18°C (64°F) in September, with overnight lows close to 11°C (52°F).

Does Ireland get a lot of rain in September?

Not particularly. Dublin averages just 74 mm (2.9 in) of rain in September, making it a mostly dry month for Ireland.

Is September a Good 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.

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.

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