Summary
Ireland experienced its second-hottest September on record last month, according to provisional figures from Met Éireann. The national average temperature reached 15.22°C, narrowly behind the record set in September 2021.
Breaking News: September Ranks Among Ireland’s Warmest Ever
Ireland has recorded an exceptionally warm September, with provisional Met Éireann data placing the month second on the national temperature record. The average temperature across the country was 15.22°C, just 0.05°C below the September 2021 record of 15.27°C.
The figures provide the latest indication of Ireland’s changing climate patterns. While individual months can vary considerably, the concentration of unusually warm months in recent decades has become increasingly clear in national weather records.
Key facts from the provisional data
- September’s average national temperature was 15.22°C.
- The month was the second-warmest September recorded in Ireland.
- September 2021 remains the warmest, with an average of 15.27°C.
- Six of Ireland’s 10 warmest Septembers have occurred since 2001.
- The figures remain provisional and may be subject to revision.
What the Met Éireann figures show
The small difference between the two warmest Septembers highlights how close the latest result came to the national record. A national average is calculated using observations from weather stations across Ireland, rather than relying on conditions in one town or county.
That means some areas may have experienced temperatures significantly above or below the national average. Local weather is influenced by factors including altitude, proximity to the coast, wind direction and cloud cover.
Even so, the national figure offers an important snapshot of Ireland’s weather. It also allows scientists and the public to compare current conditions with historical records over time.
Why a warm September matters for Ireland
A warmer-than-usual September can affect daily life, agriculture, energy demand and the timing of seasonal change. Mild conditions may extend the growing season for some crops, while also creating challenges for farming, water management and ecosystems.
For households, warmer weather can reduce the need for heating early in autumn. However, weather patterns do not move in a simple or predictable direction. A warm September does not rule out a colder winter, severe rainfall or storm conditions later in the year.
The result is best understood as one data point within a longer-term record. Met Éireann’s observation that six of the 10 warmest Septembers occurred since 2001 places the latest figures within a broader pattern of recent warmth.
How Ireland’s weather records are used
Temperature records help meteorologists identify trends, compare seasons and assess how conditions are changing over time. Provisional data is released quickly after a month ends, while checks and quality-control processes may follow.
That qualification is important. The September result has been described as provisional, so the final ranking could change if observations are updated or reviewed. The current data nevertheless shows that the month was unusually warm by historical standards.
Weather versus climate
Weather describes conditions over a short period, such as a day, month or season. Climate refers to longer-term patterns measured over many years. One warm month alone cannot explain the entire climate picture, but repeated records can contribute to the evidence used by researchers.
In Ireland, warming trends can appear alongside highly variable rainfall, wind and storm activity. This is why climate reporting needs to consider several measures rather than temperature alone.
What happens next?
Met Éireann is expected to continue monitoring conditions as autumn progresses. Later updates will provide further information on rainfall, sunshine, frost, wind and temperature across the country.
Residents should continue to check official forecasts for practical decisions, particularly when travelling, working outdoors or managing agricultural activities. A warm September does not mean that all of Ireland will experience the same conditions during the weeks ahead.
Frequently asked questions
Was September 2026 Ireland’s hottest September ever?
No. Based on provisional Met Éireann data, it was the second-hottest September on record. September 2021 remains the warmest, with an average temperature of 15.27°C.
What was Ireland’s average temperature in September?
The provisional national average was 15.22°C.
Could the ranking change?
Yes. The figures are provisional and may be revised following further checks of the national observations.
Does a warm September guarantee a mild winter?
No. Monthly weather conditions do not determine the weather for the entire winter. Ireland can experience a wide range of temperatures, rainfall and storm activity from autumn into winter.
The takeaway for Ireland
Ireland’s second-hottest September on record is a notable result, particularly because the month came within a fraction of the 2021 record. With six of the 10 warmest Septembers occurring since 2001, the latest Met Éireann figures add to the evidence of a changing national weather pattern. For readers, the key message is to follow official forecasts while viewing individual temperature records in their wider climate context.
