Why Are Pests More Active in Summer?

The Pests Most Commonly Seen in Summer

Wasps and Hornets

Wasp season in the UK typically runs from around May through to October, with peak activity falling in July and August. During this period, worker wasps are foraging constantly to feed the larvae back in the nest, which is why they become such a frequent presence at outdoor events, in gardens, and around food preparation areas.

By late summer, the larvae have developed and the colony begins to wind down. At this point, worker wasps no longer have larvae to feed, which means they lose their source of sugar and begin seeking it elsewhere. This is the stage when wasps become most aggressive and most likely to sting unprovoked.

Wasp nest removal should always be handled by a professional. Attempting to deal with an active nest without the right equipment and training significantly increases the risk of stings, particularly if the nest is disturbed.

Flies

Flies thrive in warm conditions and become far more active as temperatures rise. House flies, bluebottles, fruit flies, and drain flies are all common during the summer months, and all present hygiene risks, particularly in food handling environments.

Flies carry bacteria on their bodies and transfer them to surfaces, food, and preparation areas simply by landing. A single housefly can carry millions of bacteria. In a commercial kitchen or food retail environment, even a small fly problem can represent a serious hygiene risk and a potential compliance issue.

Flying insect control during summer requires a combination of physical barriers, monitoring, and, where necessary, targeted treatment. Good waste management and hygiene standards are also essential.

Ants

Ant activity peaks during the summer, and the annual flying ant season, usually falling in July or August across the UK, can bring swarms of winged ants to gardens and properties across the country. While flying ants themselves are relatively short-lived, the worker ants foraging through summer can become a persistent problem in homes and businesses if a nest is established nearby.

Ants follow scent trails, which means once a food source has been identified inside a property, the same route will be used repeatedly until the nest is treated. Surface sprays may disrupt the trail temporarily but rarely address the root cause.

Rodents

Rats and mice are present year-round, but their behaviour changes across the seasons. In summer, food availability outdoors tends to draw them away from buildings, but that does not mean they disappear. Gardens, allotments, commercial waste areas, and outdoor dining spaces all attract rodent activity during the warmer months.

The real surge in indoor rodent problems tends to come in early autumn as temperatures drop, but the nests and populations that develop outdoors during summer are exactly what drives that later influx. Addressing rodent activity early in the season reduces the scale of the problem when the weather changes.

Birds

Summer is the nesting season for many urban bird species. Pigeons, gulls, starlings, and sparrows can all cause significant problems during this period, particularly on commercial buildings where nesting leads to damage, fouling, and noise. Gull activity in particular intensifies during the breeding season, with birds becoming more territorial and aggressive around nesting sites.

Once birds have established nesting sites on a building, they will return to the same location year after year. Early intervention is far more effective than trying to deal with an established colony. Bird control solutions range from deterrent systems to proofing measures that prevent access to favoured nesting areas.