Outlook: Warmer Summer Increases Risk of Heatwaves

The United Kingdom is bracing for a summer that is likely to be warmer than average, with forecasts pointing to an elevated risk of heatwaves. The Met Office published its three-month summer outlook on June 1, marking the start of the meteorological summer, and highlighted a greater-than-normal probability of hot conditions. Looking ahead to the entire season, which concludes at the end of August, the forecast indicates an "increased chance of heatwaves and heat-related impacts."

This prediction follows a late spring period characterized by record-shattering temperatures across the UK. Kew Gardens in London established a new all-time May record of 35.1C, surpassing the previous benchmark of 32.8C set in 1944. Additionally, the country issued its first yellow and amber heat health alerts of the year.

Building on these trends, long-range projections from the Met Office and MeteoGroup—the provider of BBC Weather data—suggest that the upcoming months will carry the risk of further heatwaves. MeteoGroup anticipates "a few notable high temperature spikes" and expects "above-average temperatures" throughout June, July, and August. They predict "significant bursts" of heat not only in the UK but across Europe as well. The Met Office notes that the likelihood of experiencing a hotter summer is now double that of the 1991-2020 reference period, a trend aligned with the broader warming climate.

Uncertainty Surrounding Rainfall

While temperature trends are clearer, there is less consensus regarding summer precipitation. Forecasters are divided on whether the season will be dry or wet. MeteoGroup anticipates a drier period, with long-range models showing precipitation below average, particularly in England and Wales during June and July. In contrast, Scotland is more likely to experience average rainfall levels.

Conversely, the Met Office suggests that the probability of a wet summer is "slightly higher than normal." However, recent history indicates significant variability in rainfall patterns. For instance, during the 2025 summer, while the UK-wide average rainfall was 84%, northern and western regions were much wetter than usual, whereas central, eastern, and southern areas were significantly drier, receiving less than half their expected rainfall. That same year, droughts were declared across much of England following an exceptionally dry spring, leading to hosepipe bans in the summer as water demand surged.

Water Supply Pressures

Heading into this summer, data from the Environment Agency shows that most UK reservoirs are currently at or above seasonal averages, bolstered by a wet winter. Nevertheless, parts of southern and eastern England experienced an extremely dry spring, with some locations receiving only a quarter to a third of their typical rainfall. Areas including Essex, Cambridgeshire, Suffolk, and Dorset recorded some of their driest springs on record.

Consequently, river levels in parts of England are dropping "notably" to "exceptionally low." Major water providers, including Thames Water, Anglian Water, and Yorkshire Water, have already reported stress on water supplies. Any developing heatwave could exacerbate these pressures. During last week’s heatwave, Thames Water reported a sharp spike in demand, noting that "over one billion litres of extra water were used over the bank holiday weekend compared to the same weekend in 2025." Similarly, South East Water experienced supply cut-offs for 18,000 homes due to extreme demand during the hot spell.

Understanding Seasonal Forecasts

Seasonal forecasts are designed to assist healthcare providers, energy suppliers, and government agencies in planning for the upcoming three months. Representing the cutting edge of meteorological science, these predictions are generated by analyzing large-scale weather patterns.

Source: BBC News Generated at: 2026-06-02 23:37:45 UTC