Climate Insights for Ballycastle

The climate in Ballycastle is cool. The average annual temperature is 10°C and approximately 1432mm of precipitation falls per year. Ballycastle receives a notable amount of rainfall throughout the year, including during its driest month. Ballycastle is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, September, July. The coldest months are February, March, January, when temperatures can drop to 5°C. Light snow can occur between January and December.

Ballycastle has relatively stable temperatures year-round, staying within a 10°C range. August is the warmest month, though highs remain moderate at 15°C with a mean of 14°C. February is the coolest month, with minimum temperatures around 5°C and an average of 6°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.

Ballycastle is a fairly wet location, receiving approximately 1432mm of precipitation annually, which averages out to around 119mm per month. The wettest month is November, averaging 163mm of rainfall. January and December also tend to see above-average precipitation. The driest month is April, with just 57mm. That's 106mm 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 January and December, totalling around 15cm annually. February is the snowiest month with approximately 5cm.

Ballycastle is relatively calm, with an average annual wind speed of 8km/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 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, 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 4km/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 Ballycastle, which began on June 21, 2026. Ballycastle 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 15°C, while the coldest stretch bottoms out in February near 5°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The table below shows monthly climate averages for Ballycastle 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.