Climate Insights for Ardglass

The climate in Ardglass is temperate. The average annual temperature is 11°C and approximately 1013mm of precipitation falls per year. Ardglass receives a notable amount of rainfall throughout the year, including during its driest month. Ardglass is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, March, January, when temperatures can drop to 6°C. Light snow can occur between February and March.

Ardglass has relatively stable temperatures year-round, staying within a 10°C range. August is the warmest month, though highs remain moderate at 16°C with a mean of 15°C. February is the coolest month, with minimum temperatures around 6°C and an average of 7°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between October and November, with a 2°C shift in average temperatures.

Ardglass is a moderately rainy area, receiving approximately 1013mm of precipitation annually, which averages out to around 84mm per month. The wettest month is November, averaging 126mm of rainfall. December and October also tend to see above-average precipitation. The driest month is May, with just 36mm. That's 90mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between February and March, totalling around 5cm annually. March is the snowiest month with approximately 3cm.

Ardglass is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 9km/h in winter, 7km/h in spring, 6km/h in summer, 8km/h in autumn.

It is currently summer in Ardglass, which began on June 21, 2026. Ardglass is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 16°C, while the coldest stretch bottoms out in February near 6°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Ardglass is during August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 97mm per month. By contrast, February can be quite cold with temperatures dropping to 6°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Ardglass based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.