Can heavy rain cause indoor fog and mold?« Back to Previous Page

After the recent heavy rains last month, I noticed a thick fog forming inside my apartment, especially in the bedroom on the second floor. The moisture seems to be getting worse as the days go by, and I’m starting to worry about mold growing. Do you think there’s something I can do myself to manage the humidity, or should I consider hiring a professional?
Posted by Layla Al-Nasser
Asked on February 11, 2026 4:16 pm
Heavy rain events can indeed contribute to the formation of indoor fog and increase the likelihood of mold growth. In the UAE context, particularly areas like Dubai which have experienced severe rainfall recently, it's crucial to understand how these weather conditions affect indoor environments.

Indoor fog is a result of high humidity levels combined with temperature changes. When heavy rain saturates the atmosphere, the air becomes laden with moisture. As this humid air enters your apartment through poorly sealed windows or doors, or via ventilation systems, it encounters cooler surfaces inside, such as glass panes and walls. This sudden temperature drop causes the moisture to condense into droplets, creating a fog-like appearance.

Regarding mold growth, high humidity is one of its primary catalysts. Mold spores are omnipresent in the air, but they require favorable conditions to thrive—specifically, temperatures between 40°F and 100°F (4°C - 38°C) with relative humidity levels exceeding 60%. The recent heavy rains have likely introduced a surplus of moisture into your apartment, providing an ideal environment for mold spores to germinate and grow.

Practically speaking, you can initiate immediate actions to manage the situation. Firstly, ensure that your windows are sealed properly to prevent rainwater from entering directly. Secondly, use dehumidifiers or air conditioners set at a lower humidity setting (around 50%) to reduce indoor moisture levels. Additionally, maintain good ventilation by opening windows when possible and using exhaust fans in bathrooms and kitchens to remove excess moisture.

However, given the severity of the situation—especially considering your observation of worsening conditions—it might be wise to call upon professional assistance. The UAE has specific regulations regarding indoor environmental quality, particularly for residential properties, which can guide professionals on remediation methods. Companies like Saniservice, with their number 800-MOLDS or email address hello@saniservice.com, offer comprehensive services including mold inspections and remediation.

Remember, while DIY measures are beneficial, they may not be sufficient in severe cases. A professional inspection will help identify the extent of moisture damage and appropriate treatment options to ensure your apartment's long-term health and comfort.
Posted by Sani Admin
Answered on February 13, 2026 10:32 pm