Portmarnock weather in September (Dublin County, Ireland)
Curious about the September weather in Portmarnock? Wondering if it's the right time to visit? Browse this page for a comprehensive overview of the weather conditions for that month.
In September, Portmarnock typically experiences moderate temperatures and moderate rainfall. September falls within the summer season. Throughout the daytime, temperatures often hover around 17°C. However, as the sun sets and evening approaches, there's a noticeable cool-down, with temperatures gently dropping to a more temperate 12°C.
Portmarnock in September usually receives moderate rainfall, averaging around 78 mm for the month. Typically around 15 days of rainfall is expected.
The area enjoys a balanced 128 hours of sunlight. Ensuring it's neither too overcast nor too sunny.
If your ideal day consists of dry skies and moderate temperatures July and August generally stand out with the best circumstances. While January, February and December tend to showcase less optimal conditions.
For an in-depth look at the yearly conditions, visit our specialized Portmarnock climate page with graphs.
Portmarnock, monthly averages in September
Min Temperature
12°C
Max Temperature
17°C
Water Temperature
15°C *
Chance of Rain
50%
Precipitation
78 mm
Rainy days
15 days
Humidity
71% *
Windspeed
14 km/h *
Sunshine
128 hours *
Percentage Sunshine
33% *
Where to go in Ireland in September
Find out more about the weather in Ireland in September and which places have the best weather conditions in this month.
perfect weather
pleasant
tolerable
unpleasant
poor
So, what should you wear in Portmarnock in September?
For visitors traveling to Portmarnock, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes. With a water temperature of around 15°C there is no need to bring your swimwear.What To Do
We rated the following activities from 1 (least suitable) to 10 (best) to do in September.
Interested in more climate information?
Weather and Climate provides you with all the information you need about the climate in Portmarnock.
Our site offers climate and forecast data for every country in the world. Are you going to Ireland? On this website you can find 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 climate conditions. Find out where to go with our weather planner.
