Meteorologists have warned that a rare 'blood rain' phenomenon is expected to hit parts of the UK this weekend as temperatures cool following a scorching heatwave. The event occurs when Saharan dust particles, swept into the atmosphere by high pressure, mix with rain and fall as reddish-coloured precipitation.
Where and When Will Blood Rain Occur?
The heaviest blood rain is forecast across southern England, with dust concentrations highest due to prevailing winds and the position of the high-pressure system. The rain will follow a cold front that brings an end to the current heatwave, with showers and thunderstorms expected. According to Jim Dale, senior meteorologist at the British Weather Service, the dust originates from the Sahara and Spain. He told The Mirror: 'Some of that dust sand will fall to earth in the showers that'll come. That's out of the Sahara, and out to Spain; the brown lands of Spain. So expect your cars to be covered in dust sand. It won't be everywhere, but it will be in certain places — mainly the south.'
Impact on Daily Life
Residents in affected areas should expect a layer of fine dust on cars, windows, garden furniture, and other outdoor surfaces. While the dust is not harmful to health, it can be unsightly and may require an extra wash. The phenomenon is primarily cosmetic, but it has caused inconvenience in the past. When the UK experienced blood rain in March 2026, many people had to clean their vehicles and windows to remove the stains.
Heatwave Conditions Preceding the Rain
The UK has been experiencing a severe heatwave, with temperatures reaching 36°C in Gosport, Hampshire, on Wednesday, according to the Met Office. A red weather warning, indicating a danger to life, has been in effect until Friday. Hundreds of schools have closed, particularly in South Wales and the Southwest of England. The heatwave is driven by a 'heat dome' bringing warm air from Europe and Africa.
What Is Blood Rain?
Blood rain is a rare weather phenomenon in the UK due to its typically mild climate. It occurs when high concentrations of dust from the Sahara Desert are lifted into the atmosphere and then deposited with rain. The dust gives the rain a reddish or brownish tint, hence the name. BBC lead weather presenter Stav Danaos explained earlier this year: 'The downside of Saharan dust is that when it mixes with rain, it can leave dirty deposits on surfaces, particularly cars and windows, a phenomenon commonly known as blood rain.'
Forecast for the Weekend
The Met Office expects the most significant rain in several days over the weekend, with the heaviest downpours in parts of Northern England. As the cold front moves in, temperatures will drop, providing relief from the heatwave. The dust-laden showers are most likely in southern and western areas, but some northern regions may also experience the phenomenon.
