Residents across the United Kingdom are being urged to keep their windows shut both day and night as the False Widow spider—a venomous species related to the Black Widow—enters its peak mating season. This alert comes from Dr. Tom Elwood, a top arachnologist, who warns that now is not the time for panic—but for smart preparation. “August is when male spiders become active,” Elwood explained. “They’re searching for a mate and will wander through open windows, vents, or even bathroom drains.”

The False Widow, though not lethal, can deliver a bite with wasp-like pain, causing burning, swelling, and fever. It’s one of the few spider species in the UK known to regularly bite humans, and experts say their presence in homes is increasing. The spider’s venom has led to multiple medical reports in recent years. BBC News previously documented cases where victims experienced intense skin irritation and systemic reactions—making it a pest not to ignore.

To protect your home during this peak activity season, residents are being advised to take several precautionary steps. Keep all windows shut—day and night, especially during the next four weeks. Clean windows and frames weekly, as spiders prefer dusty, grimy surfaces where webs adhere better. Seal any gaps or cracks—particularly around doors, vents, and pipe openings. Use peppermint oil, a natural deterrent known to repel spiders, and remove spider webs regularly to disrupt their breeding zones.

Another important measure is to trim foliage or vegetation that touches your house, as this can act as a natural bridge for spiders trying to enter. Spiders often use overhanging branches or plants to access upper floors or windows, making it easier for them to infiltrate your home. Keeping the perimeter of your home clean and clutter-free reduces potential entry points and hiding spots for these arachnids.

“Spiders are already on the move,” warns Dr. Elwood. “You may not see them, but they’re climbing walls, slipping in through vents, and squeezing through cracks.” As experts emphasize, preparation now can save you from a very unpleasant surprise later. With climate change contributing to longer mating seasons and increased indoor spider sightings, now is the time to act.