How much rain will Cornwall need to end the drought?

You’ve probably noticed it lately. Wet pavements, grey skies, the odd proper downpour. So the drought must be over by now?

Not yet, according to South West Water.

What South West Water is saying

The water company has taken on the question plenty of people across the region are asking: how much rain will it actually take for our water supplies to recover?

Its answer starts with where things stand. The South West is still experiencing severe drought, and months of unusually hot, dry weather have put significant pressure on rivers, reservoirs and the wider environment.

Getting those water resources back will take sustained rainfall over time. A handful of wet days won’t do it.

Why a downpour isn’t enough

To explain why, South West Water pointed people to a deep dive from the Met Office, published in August, looking at the UK’s rainfall deficit and why recovery takes so long.

At the time, parts of England and Wales had received around 150mm less rainfall than average since April. Some places had gone almost two months with consecutive dry days.

The heat made it worse. Strong sunshine drives up evaporation, so soils lose moisture faster and need even more rain before they bounce back.

And the kind of rain matters as much as the amount. The Met Office explained that drought relief works best when rain arrives in prolonged, steady spells. Showers can dump big totals in one spot and leave somewhere a short distance away with very little.

A summer for the record books

The dry spell sat alongside two major heatwaves, one in late June and another in mid-August, with temperatures reaching 38°C in both. The June heatwave brought the earliest 38°C on record.

By August, bone-dry vegetation and soils had pushed up the wildfire risk, with significant fires in several locations.

Back then, the Met Office said what England and Wales needed was a sustained period of wetter weather lasting well into autumn. Any rain at that point, it said, was a start rather than a solution.

Every drop still counts

In the meantime, South West Water has thanked everyone who keeps doing their bit to save water at home, saying those efforts are making a difference.

“Every drop really does count,” the company said.