The UK is preparing for a surge in venomous False Widow spiders entering homes as their annual mating season starts. Experts warn these spiders, considered the most venomous in the country, can deliver a painful bite. While their venom is not deadly, it can cause swelling, burning sensations, and fever.

Similar to the Black Widow

False Widows belong to the same family as the deadly Black Widow spider. They have now firmly established themselves in homes across the UK and are one of 12 spider species in the country known to have bitten humans.

Why They Enter Homes

Arachnologist Dr Tom Elwood explained, “August is when male spiders become active. They’re searching for a mate and they’ll wander through open windows, up walls, into bathtubs — anywhere they can.”

He noted that dust and debris on windowsills and frames can also attract spiders. “Spiders are drawn to dust, insect remains and debris on window frames. Webs cling better to rough or grimy surfaces. That’s why cleaning your windows is just as important as keeping them shut.”

Warning to Residents

Dr Elwood cautioned, “Spiders are already on the move. You may not see them, but they’re out there — climbing walls, slipping in through vents, and squeezing through the tiniest cracks.” He urged residents to keep windows closed both day and night, adding, “This isn’t paranoia — it’s smart preparation.”

Tips to Keep False Widows Out

• Keep windows closed at all times

• Clean glass and frames weekly

• Seal visible gaps and cracks

• Use vinegar-based sprays to prevent web-building

• Tidy corners and dark spaces where spiders hide

“Do the right things now, and you won’t be waking up to spiders crawling across your bedroom floor,” Dr Elwood advised.