Large swathes of southern Britain face an intense heat spell this week after the Met Office upgraded forecasts and extended an Amber heat warning — raising the prospect of near-40°C temperatures that could disrupt daily life, strain services and create health risks. The warning covers a concentrated period in late June and brings not just daytime highs but unusually warm nights that will complicate recovery from daytime heat.
When and where the heat will be worst
The alert runs from Monday 22 June until Thursday 25 June and mainly affects the South East of England and parts of Wales. Temperatures are expected to climb rapidly on Monday, with southern areas reaching the mid-30s Celsius.
Models now point to the peak arriving on Wednesday and Thursday (24–25 June), when readings of around 38°C are possible in the hottest zones. By Friday the heat should ease, with highs nearer the low 30s across eastern regions.
Forecasters warn of an impactful event
Met Office deputy chief forecaster Tom Crabtree says the incoming spell is turning into a significant weather event, combining exceptionally high daytime temperatures with raised humidity. That mix, he warns, will increase pressure on public health, transport, power and water systems and spread disruption beyond those typically considered most vulnerable.
Night-time warmth and record risks
Forecasters are also flagging a string of Tropical Night conditions, where overnight temperatures stay above 20°C. Consecutive warm nights reduce the chance for bodies to recover from daytime heat, a factor that can worsen heat-related illness across the population.
Current projections make it likely that June temperature records — the previous high around 35.6°C recorded in 1976 — will be exceeded in some locations this week.
- Dates: 22–25 June (Amber warning period)
- Regions most affected: South East England and parts of Wales (with warm conditions spreading north later)
- Expected highs: 34°C on Monday, ~37°C on Tuesday, up to 38°C on Wednesday–Thursday; easing to ~33°C by Friday
- Night-time risk: consecutive nights likely to remain above 20°C (Tropical Nights)
- Key impacts: public health strain, transport delays, pressure on power and water supplies, more people seeking cooling at coasts and reservoirs
- Water safety advice: follow lifeguards, use flagged areas, and remember RNLI guidance if you get into difficulty
Although Scotland is not included in the Amber alert, warm air will push northward. Forecast charts indicate temperatures rising into the mid-20s in parts of eastern Scotland early next week, with some southern areas reaching about 30°C by Thursday.
The combination of heat and humidity also raises specific safety concerns around open water. With more people likely to head for beaches and lakes, authorities warn that sea and surface water remain relatively cold compared with air temperatures; sudden immersion can cause cold-water shock and raise drowning risk.
How to stay safer in and out of the water
Samantha Hughes, the National Water Safety Partner at the RNLI, stresses practical precautions. She reminds swimmers of the “Float to Live” technique — lean back to keep your head clear, control your breathing and stay calm if you get into trouble — and encourages people to choose lifeguarded beaches and swim between the flags. In coastal emergencies, call 999 for the coastguard.
Beyond water safety, public-health and emergency services advise practical measures to reduce heat risk: keep hydrated, avoid strenuous activity during the hottest hours, check on older people and those with health conditions, and plan for possible transport and utility disruptions.
Why this matters now: an extended run of very high daytime temperatures combined with warm nights creates conditions that are harder to manage than single hot days. The expanded Amber warning signals elevated risk across services and communities, making vigilance and simple precautions important for anyone in the affected areas.
Hi, I’m Benjamin, a member of the Sherburne County Citizen team. With a passion for writing and a deep interest in current affairs, I thoroughly enjoy bringing you the latest news and trends that affect our daily lives.
