Portmarnock Weather in October

Portmarnock in October averages 15°C (59°F) during the day and 9°C (48°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Portmarnock in October

Typically around 17 days of rainfall are expected, averaging 87 mm (3.4 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Portmarnock in October

Daytime highs in Portmarnock in October reach 15°C (59°F), with nights around 9°C (48°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Portmarnock in October

With limited sunshine this month, there are about 97 hours of sun. It's ideal for those who prefer a cooler, cloudier climate.

Wind Speed in Portmarnock in October

October has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in October

With water at 14°C (57°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

If you prefer dry days with pleasant temperatures, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Ireland, check out our Portmarnock's climate page.

Portmarnock Temperature in October

Min Temperature 9°C (48°F)  

Max Temperature 15°C (59°F)  

Water Temperature 14°C (57°F) *  

Chance of Rain 55%  

Precipitation 87 mm (3.4 in)  

Rainy days 17 days  

Humidity 75% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 97 hours *  

Percentage Sunshine 31% *  

* Data from: Dublin, Ireland (7 KM, 4 Miles).

What to Wear in Portmarnock in October

The weather can swing between comfortable and chilly in October, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 14°C (57°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. With limited sunshine expected, sunglasses aren't a priority for packing.

What To Do in Portmarnock in October

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Portmarnock's climate page.

More climate data for Portmarnock

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Portmarnock climate overview or explore weather in Ireland.