Weather in Cork in August

Shoulder season. August is shoulder season in Cork — cheaper, quieter, and a genuine gamble. You should expect rain on 18 days of the month, which is more days wet than dry.

August ranks 4 of 12 in Cork: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 18 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average August reaches 30 °C. Across the twenty years measured, the hottest August day reached 26.2 °C and the coldest night fell to 5.7 °C, and the wettest single day dropped 30 mm — roughly 29% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 180 mm against 26 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 102 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 88%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 19 °C in July, 18.8 here, 17.2 in September. Nothing about the timing within the month matters much.

Daylight in August

14.7 hours of daylight, losing 1.8 hours across the month. That is between Cork's extremes of 16.7 and 7.8 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 16.6 °C in August — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, April is the trade worth considering — 14 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Cork versus nearby

If Cork is one option among several, the nearby comparison is worth making. Galway is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Dublin is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: August is effectively as good as it gets here — 2 points behind July, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Cork

See all twelve months in Cork, or where else to go in August.