UK residents are being urged to keep their windows closed this August as the venomous False Widow spider enters its peak mating season.

The spider, often called Britain’s most dangerous native species, becomes highly active during late summer. Male spiders leave their webs to search for mates and may enter homes through open windows, vents, or even drains.

Dr. Tom Elwood, a leading spider expert, explained that while False Widow bites are not deadly, they can be extremely painful. Victims often compare the sensation to a wasp sting.

In some cases, the venom can cause severe swelling, burning pain, and fever. Several medical reports in the UK have confirmed these more serious reactions, making the species a growing concern.

False Widows are increasingly common in British homes, particularly in warm, sheltered spots such as attics, sheds, and window frames. Their sticky webs can often be spotted in corners and crevices.

To reduce the risk of unwanted visitors, experts advise keeping windows closed around the clock for the next month. This is the most active period for the spiders, and limiting entry points is key.

Other recommended precautions include cleaning window frames weekly to remove webs and sealing cracks around doors, vents, and pipes where spiders could slip inside.

While the False Widow is unlikely to pose a life-threatening danger, awareness and prevention can help residents avoid painful encounters during the height of the spider’s breeding season.