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As summer winds down and cooler evenings roll in, September is a critical month for household pest control. Many insects and rodents begin looking for warmth and shelter — and your home is often their first stop.
By understanding which pests are most active in September and taking a few preventative steps, you can stop infestations before they start and enjoy a pest-free autumn.

Why Pest Control in September is Important

  • Cooler nights drive pests indoors – rodents, spiders, and insects seek warmth.

  • Food sources change – as outdoor supplies dwindle, pests look for food inside your home.

  • Breeding season – wasps, spiders, and rodents are especially active in early autumn.

Taking action now means fewer problems later in the colder months.

How to Get Rid of Wasps in September

September is peak wasp season — nests are at their largest, and wasps become aggressive as their food sources decline.

Signs of a wasp problem:

  • Increased wasp activity near bins or outdoor eating areas

  • Visible nests under eaves, in roof spaces, or garden sheds

What to do:

  • Use a wasp nest destroyer spray directly on the nest (apply at night when activity is lowest)

  • Keep bins tightly closed and food covered outdoors

  • Call a professional if the nest is large or in a difficult location

Shop our full range of wasp control products at Lenehans.ie.

Preventing Spiders This Autumn

Spiders are most active indoors during September as males search for mates. While harmless, they’re not always welcome.

How to reduce spiders in the home:

Tip: Keeping rooms clutter-free reduces hiding spots.

How to Stop Rodents Entering Your Home in September

Mice and rats begin moving closer to houses in September, looking for warmth and food. Once inside, they can cause damage and spread germs.

Prevention steps:

Browse mice and rat control solutions at Lenehans.ie.

Ants and Other Crawling Insects in Early Autumn

While ants are less of a nuisance than in summer, damp weather in September can push them indoors. Other pests like silverfish and beetles may also appear.

How to keep ants and crawling pests out:

  • Clean up crumbs and spills immediately

  • Store food securely in airtight tubs

  • Apply ant powders and sprays around skirting boards and entry points

5 Easy Steps to Pest-Proof Your Home in September

  1. Seal gaps and cracks with sealants and fillers

  2. Secure bins and food with airtight containers and lids

  3. Clear the garden – trim hedges, remove leaf piles, and move firewood away from walls

  4. Inspect attics, basements, and sheds for signs of pests

  5. Use pest control products wisely – sprays, traps, and deterrents stop infestations early

Making Pest Control Easier

At Lenehans.ie, we make it simple to protect your home this September. From wasp sprays and ant powders to rodent traps and weatherproofing products, we stock everything you need to keep pests outdoors.

Need advice? Our AI Product Assistant can recommend the right product for your specific pest problem, helping you shop with confidence.

Final Thought

September is a turning point for pest activity in Ireland. Wasps, spiders, rodents, and ants are all on the move — but with the right preparation, you can keep them out of your home.
Take an afternoon this month to check seals, tidy the garden, and stock up on pest control essentials. A little effort now means peace of mind for the rest of autumn.

Visit Lenehans.ie Pest Control for everything you need this season.