Dublin

Dublin County Weather in September

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

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Dublin Swords Dun Laoghaire Rathgar

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

What to Expect in Dublin County in September

Dublin County, Ireland is a region in Ireland. September in Dublin County generally has mild temperatures, with moderate precipitation.

Temperatures

You can expect mild maximum daytime temperatures of around 18°C (64°F) and nighttime temperatures around 11°C (52°F) in Dublin.

To learn more about the conditions in specific areas of Dublin County, Ireland, check out the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Lucan with an average of 73 mm (2.9 in) to moderate rainfall in Dalkey with 81 mm (3.2 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 Dublin County by month

Pick a month to see the average temperature, rainfall and sunshine in Dublin County — 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 Dublin County →

Best Places to Visit in Dublin County in September

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

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 Dublin County

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

Temperature range in Dublin County (September)

Precipitation variation in Dublin County (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 →

Swords

In September Swords 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)
81 mm (3.2 in)
Monthly rainy days
16 days
15 days
17 days
Weather conditions
perfect
pleasant
tolerable
Climate in Swords →

Dun Laoghaire

In September Dun Laoghaire generally has moderate temperatures with maximum daytime temperatures around 17°C (63°F), minimum nighttime temperatures around 11°C (52°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
13°C (55°F)
11°C (52°F)
9°C (48°F)
Monthly sun hours
157 hours
128 hours
97 hours
Monthly rainfall
84 mm (3.3 in)
80 mm (3.1 in)
90 mm (3.5 in)
Monthly rainy days
16 days
15 days
17 days
Weather conditions
pleasant
tolerable
tolerable
Climate in Dun Laoghaire →

Rathgar

In September Rathgar 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
19°C (66°F)
18°C (64°F)
14°C (57°F)
Min temperature
12°C (54°F)
11°C (52°F)
8°C (46°F)
Monthly sun hours
157 hours
128 hours
97 hours
Monthly rainfall
84 mm (3.3 in)
77 mm (3 in)
82 mm (3.2 in)
Monthly rainy days
16 days
15 days
17 days
Weather conditions
pleasant
pleasant
tolerable
Climate in Rathgar →

Cloghran

In September Cloghran 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)
75 mm (3 in)
81 mm (3.2 in)
Monthly rainy days
16 days
15 days
17 days
Weather conditions
perfect
pleasant
tolerable
Climate in Cloghran →

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

Popular cities in September

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

City Weather Day temp Night temp Rainfall
Dublin 18°C (64°F) 11°C (52°F) 74 mm (2.9 in)
Swords 18°C (64°F) 11°C (52°F) 74 mm (2.9 in)
Dun Laoghaire 17°C (63°F) 11°C (52°F) 80 mm (3.1 in)
Rathgar 18°C (64°F) 11°C (52°F) 77 mm (3 in)
Cloghran 18°C (64°F) 11°C (52°F) 75 mm (3 in)
Clondalkin 18°C (64°F) 10°C (50°F) 74 mm (2.9 in)

Dublin County weather in September: frequently asked questions

What is the weather like in Dublin County, Ireland in September?

Expect pleasant weather across Dublin County, 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 Dublin County, Ireland in September?

Daytime temperatures in Dublin peak at roughly 18°C (64°F) in September, dropping to about 11°C (52°F) overnight.

Does Dublin County, 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 Dublin County, Ireland.

Is September a Good Time to Visit Dublin County, Ireland?

In our opinion, September is a good time to visit Dublin County, 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 Dublin County, Ireland is in July and August with generally perfect weather in Dublin. On the other hand, the months of January, February and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Dublin County.

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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