UK residents are being warned to keep their windows shut this August as the False Widow spider enters its peak mating season. Known as Britain’s most venomous native species, its activity increases sharply in late summer.

During this period, male False Widows leave their webs in search of mates. In doing so, they often wander into houses through open windows, vents, and even drains, raising the likelihood of human encounters.

The False Widow has earned a notorious reputation because of its venomous bite. While not usually life-threatening, it is far more painful than bites from other native spiders found in the UK.

Dr. Tom Elwood, a leading arachnologist, noted that many victims describe the sensation as similar to a wasp sting. In most cases, the discomfort fades within a few hours or days.

However, more severe reactions have been documented. Medical reports detail symptoms including intense swelling, burning pain, dizziness, and fever. These cases, while less common, highlight why the species is taken so seriously by experts.

The spider’s increasing spread across the country has added to public concern. Originally from the Canary Islands and Madeira, the False Widow has adapted well to the UK’s climate and urban areas.

Experts advise simple precautions during mating season. Keeping windows closed, especially at night, reduces the risk of spiders entering homes. Sealing gaps, using window screens, and avoiding clutter where they may hide are also recommended.

Though encounters can be alarming, Dr. Elwood stresses that bites remain relatively rare. “Awareness and prevention are key,” he said. “By taking simple steps, people can avoid unwanted surprises this summer.”