Portmarnock Weather in September

What's the weather like in Portmarnock (Leinster) in September 2024?

The climate in Portmarnock during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Portmarnock and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 17°C (62°F), whilst at night 10°C (49°F) is normal.

Portmarnock weather averages (imperial / metric)
Daytime temperature 16.6°C 61.9°F
Nightly temperature 9.5°C 49.1°F
Average temperature 13.1°C 55.5°F
Daily sunshine 4.7 hrs
Avg rainfall 78 mm 3.1 ins
Rainy days 15 days
Sea temperature 15.3°C 59.5°F
Humidity 83%
Windspeed 17.6kph 11 mph

On average September is the 5th wettest month of the year in Portmarnock with around 78mm 3.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.

On the flip side this corresponds to an average of 4.7 hours of sunshine per day.

September temperatures in Portmarnock

Portmarnock average temperature in September

September rainfall

Portmarnock average rain in September

September hourly sunshine

Portmarnock average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Portmarnock in September 2024.

Other monthly averages

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Portmarnock weather stats

Portmarnock weather statistics
Hottest month: July 18.8°C 65.8°F
Driest month: April 55mm 2.2ins
Sunniest month: May 6.6hrs
Coldest month: February 7.4°C 45.3°F
Wettest month: December 94mm 3.7ins
Map showing location of Portmarnock (53.42306, -6.1375) Portmarnock map pin © Google

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