Urgent Warning: Keep Windows Closed as False Widow Spiders Surge Across the UK

Homeowners across Britain are being urged to stay cautious as sightings of the False Widow spider rise sharply during its peak mating season. Experts warn that this is the time of year when the species becomes most active — and most likely to find its way into homes through open windows, vents, and small cracks.

The Season of the False Widow

Arachnologist Dr. Tom Elwood, who has spent more than ten years studying the species, explains:

“From August into early September, male spiders start roaming in search of mates. They often slip indoors through any tiny opening they can find.”

The False Widow (Steatoda nobilis), sometimes mistaken for the infamous Black Widow, has lived in the UK for more than a century. Its bite is rarely dangerous but can cause mild swelling or pain similar to a wasp sting. Over time, the spider has adapted to Britain’s mild climate and is now frequently found in homes, sheds, and garages — particularly during the warmer months.

How Climate Change Helped Them Spread

Once confined to southern coastal areas, False Widows have gradually spread north, thanks to warmer temperatures and milder winters. “They’re not going anywhere,” Dr. Elwood says. “But with a bit of awareness, people can easily avoid unwanted encounters.”

How to Keep False Widows Out of Your Home

Experts stress that prevention is far more effective than extermination. Simple steps can drastically reduce the chance of spiders getting indoors:

• Keep windows and doors closed, especially after dark. If you need airflow, install mesh screens.

• Seal cracks and gaps around doors, vents, and pipes.

• Regularly clean corners and window sills, as spiders prefer quiet, dusty places to build webs.

• Vacuum webs rather than removing them by hand.

• Use natural repellents like peppermint oil, vinegar, or citrus around entry points.

• Trim plants that touch your walls or windows, as they can provide a path inside.

• Reduce outdoor lighting to avoid attracting insects — a spider’s favorite meal.

“These spiders aren’t drawn to dirt,” Dr. Elwood explains. “They’re just looking for still, quiet spaces where insects are easy to catch.”

What to Do If You’re Bitten

Although bites are uncommon, they can happen. Typical symptoms include redness, swelling, or mild pain. Clean the bite with soap and water, apply a cold compress, and seek medical help if symptoms worsen. Most people recover within a few days without any complications.

Medical experts emphasize that serious reactions are extremely rare — and that most False Widow encounters end harmlessly.

Keep Calm and Stay Informed

Despite their fearsome reputation, False Widows actually help control pests by feeding on flies, mosquitoes, and other insects. Many scientists suggest that learning to coexist with them is more practical than trying to wipe them out.

“The False Widow isn’t an invading threat,” Dr. Elwood notes. “It’s simply adapting to our environment. Knowledge and calm are always better than panic.”

A Simple Reminder

As the UK enters the height of spider season, experts agree on one thing: awareness is key. Keep your home tidy, seal small gaps, and close those windows at night.

Before you go to sleep, a quick look around your windowsills might save you from an unexpected eight-legged guest.