Climate Insights for Cahersiveen

The climate in Cahersiveen is temperate. The average annual temperature is 11°C and approximately 1543mm of precipitation falls per year. Cahersiveen receives a notable amount of rainfall throughout the year, including during its driest month. Cahersiveen is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, March, February, when temperatures can drop to 5°C. Light snow can occur between January and November.

Cahersiveen sees moderate temperature variation throughout the year, ranging from 5°C to 17°C. August is the warmest month, though highs remain moderate at 17°C with a mean of 15°C. January is the coolest month, with minimum temperatures around 5°C and an average of 7°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Cahersiveen is a fairly wet location, receiving approximately 1543mm of precipitation annually, which averages out to around 129mm per month. The wettest month is December, averaging 171mm of rainfall. October and November also tend to see above-average precipitation. The driest month is May, with just 77mm. That's 95mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and November, totalling around 6cm annually. March is the snowiest month with approximately 2cm.

Cahersiveen is mildly breezy, with an average annual wind speed of 19km/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 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 9km/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 23km/h in winter, 18km/h in spring, 17km/h in summer, 20km/h in autumn.

It is currently autumn in Cahersiveen, which began on September 23, 2026. Cahersiveen 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 17°C, while the coldest stretch bottoms out in January near 5°C. Winter is next, beginning on December 21, 2026 (87 days from now).

The best time to visit Cahersiveen is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 94mm per month. By contrast, August can be uncomfortably hot with highs reaching 17°C, while January is the coldest period with lows dropping to 5°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 Cahersiveen 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.