Britons have been warned to keep their windows closed this month during the latest sizzling heatwave as flying ants are set to swarm the UK. Dr Nathaniel Green has studied insect behaviour for more than two decades and fears conditions are lining up perfectly for a concentrated burst of the annual phenomenon known as Flying Ant Week. 

This year, he predicts the action will peak between August 13th and 18th – when warm temperatures, high humidity and still air create the ideal launchpad for millions of winged queens and males to take flight. Dr Green explains: “When the weather hits that sweet spot, it’s like a signal for ants everywhere to take to the air at once. Afternoons will be the main time to watch out — or keep your windows firmly shut.”

Why your windows are a magnet: 

Flying ants aren’t dangerous, but they’re not exactly welcome guests when they drift inside – and dirty windows could be inviting them in. 

Dr Green said: “Smears and dust on glass can reflect light in a way that draws insects closer. 

“Add in pollen or organic residue and you’ve basically got an insect buffet. Cleaning your windows before the swarms hit will make your home far less attractive to them.” 

That’s why he’s advising everyone to clean their windows now and keep them closed during peak hours in mid-August.

Short-lived, but unpleasant: 

The good news? Flying ant swarms don’t last long. Dr Green explains: “The flying phase only lasts a few days. Males die soon after mating, and fertilised queens land to start new colonies.” 

Still, those few days can be enough to leave your kitchen or lounge buzzing with unwanted visitors. 

The advice is simple: give your windows a proper clean, keep them closed during peak swarm hours, and brace for a few days in mid-August when the UK could be under insect invasion. 

With a bit of preparation, you can enjoy the summer warmth without sharing it with hundreds of winged intruders.

Expert window-cleaning tips: 

Window sticker experts at Quote My Wall have learned plenty of window-cleaning tricks over the years, as spotless glass is essential before any application of stickers. Here are their top three tips. 

1. Choose the right cleaner – A mix of equal parts white vinegar and water, or a quality glass cleaner, will break down grime and leave nothing for insects to feast on. 

2. Swap paper towels for microfibre cloths – They trap dust better, stop streaks, and give you a truly clean surface. 

3. Pick your moment – Clean on an overcast day. Direct sun dries the solution too fast and leaves marks.