11/08/2026
We all know the advice about keeping cool in hot weather – drink plenty of water, stay in the shade, keep curtains and blinds closed to prevent heat getting in. But did you know that hot weather can increase the risk of damp, mould and condensation in our homes?
This is because warm air holds more water vapour than cool air, which means that during hot spells indoor humidity rises, especially in homes with closed windows or poor airflow. Warm air absorbs moisture from cooking, showering, and drying clothes. This is the same way that winter condensation happens, but in the summer, this is driven by humidity rather than cold.
So what can we do to reduce the risks of damp, mould and condensation during the hot summer months?
* Ventilate early morning and late evening when the air is cooler
* Always use an extractor fan if available to remove moisture from the air, particularly after showering or cooking
* If you have one, use a dehumidifier during laundry and showers
* Move furniture slightly off external walls to discourage mould and damp from forming - check behind furniture weekly for mould
* Keep blinds closed during the day to reduce indoor heat