Ireland is set to experience a significant rise in temperatures after an unusually cold May, with a warm spell expected to last through the first half of the upcoming week. Met Éireann, the national meteorological service, describes this weather pattern as a 'warm spell' rather than a heatwave, which requires five consecutive days of temperatures at or above 25 degrees Celsius at a single location. While some areas may see temperatures reach or exceed 25 degrees starting Monday, the forecast indicates that the warmest conditions will likely be concentrated in Leinster. The last heatwave in Ireland occurred in September 2023, and with just over a week until June, the likelihood of a heatwave this spring remains low. In contrast, parts of Britain are expected to enter official heatwave territory, with thresholds of three consecutive days exceeding 25 degrees in Scotland and Northern Ireland, and 28 degrees in London. Additionally, countries like France, Spain, and Portugal are forecasted to experience temperatures surpassing 30 degrees. Met Éireann attributes the increasing frequency and intensity of heatwaves globally to human-caused climate change.