Why Are There More Insects in the Summer?

Summer is the time to have fun in the sun, but we’ve all had our picnic ruined by a swarm of ants or an annoying mosquito.

But why are there so many more bugs in the summer? It isn’t just one reason, there are a couple factors that add up to you having to stock up on a concerning amount of bug spray.


Bugs are cold-blooded, which means they cannot regulate their temperature. Warm-blooded creatures (or homeotherms) are able to keep a stable internal body heat, no matter the weather outside. Cold-blooded creatures (poikilotherms), such as insects and reptiles, are at the mercy of mother nature. As it gets colder, so do they. In the winter they will either hibernate or simply die away. During summer, however, the heat allows them to function normally, and they become increasingly more active.

Mating Season

During winter most bugs will either die or hibernate. That means when it finally begins to heat up, they are all eager to come out and play. For many insects, spring is mating season, as it is with most wild animals. The eggs laid during the spring will hatch in summer, creating a whole wave of new insects. Summer itself is mating season for other insects, as they attempt to stock their colonies before it becomes too cold. Either way, this leads to insect activity reaching its peak.


Like all living things, insects rely on water to survive. During summer there is increased rainfall and more moisture in the air, creating more favorable conditions. Insects are drawn to moist areas and, if it gets too hot, insects are known to head indoors in search of shade and water. Certain animals, such as the detestable mosquito, lay their eggs upon stagnant water. This means places like lakes and ponds, as well as places closer to home, such as blocked gutters and drains, swimming pools, water filled containers and areas with poor drainage.


Insects aren’t the only thing found in abundance during summer. There is plentiful vegetation growing thanks to the summer showers and increased daylight. As more plants grow, there is a larger food source for creepy crawlies to snack on.

It isn’t just plants they snack on. Some insects will drink the blood or sweat of mammals and, as more people and animals head outside during summer, there are more targets available. Certain predatory insects will hunt other insects and will be drawn out by the sudden abundance of other creepy-crawlies, creating a sort of self-fulfilling prophecy.


During the summer we enjoy longer days but we aren’t the only ones. Most insects are far more active during the day than night. More hours in the day gives them more time to eat, to breed and to invade your home and claim it as their own.

If you are dealing with an infestation of pests this summer, call CDI Pest Management on 1300 737 826 today!