Rayleigh is under an Amber extreme heat warning as the Met Office warns of a dangerous hot spell gripping the town and wider Essex through Thursday night. The first warning runs until 11:59pm on Tuesday 23 June, with a second warning stretching from midnight Wednesday to 11:59pm on Thursday 25 June.
Temperatures are set to reach the low to mid-30s Celsius on Monday and become more widespread on Tuesday. Deputy Chief Forecaster Tom Crabtree said the heat will intensify further, with the Met Office forecasting a peak of 38C on Wednesday and Thursday. Overnight temperatures will stay above 20C, creating what meteorologists call Tropical Nights, especially in built‑up areas. The first warning carries a medium impact and likelihood rating, while the second has a high impact and medium likelihood.
The UK Health Security Agency has issued Yellow and Amber Heat Health Alerts for the region, highlighting the strain on health and social care services. The heatwave is expected to break the June temperature record of 35.6C, last recorded in Southampton in 1976 and Camden Square in 1957. High humidity will make conditions feel even more oppressive, with dew points around 22C by mid‑week, increasing the risk of heat stress on people and pressure on power and water supplies.
Emergency services in Rayleigh are braced for a rise in heat‑related calls and water safety incidents as residents seek relief at the coast, lakes, or rivers. The RNLI’s National Water Safety Partner Samantha Hughes urged caution, noting that sea temperatures remain cold despite the warm air, which can lead to cold water shock. Local authorities across Essex are responsible for implementing any local emergency measures if needed.
The hot spell follows a very warm weekend that acted as a precursor to the developing heatwave. Heatwave criteria, which require temperatures to stay above the local threshold for three consecutive days, are likely to be met across southern and southeastern England. The Met Office warns the combination of scorching days and sticky nights will affect the wider population, not just those typically vulnerable to extreme heat.
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