Bangkok's extreme heat, monsoon rains, and year-round humidity demand a proactive approach to home maintenance. Miss a step and you're dealing with mould, water damage, pest infestations, or a broken AC in 40-degree heat. This month-by-month calendar keeps your Bangkok home in top condition all year.

Cool/Dry Season (November - February)

November

The rainy season is ending — time to assess the damage. Inspect your roof and gutters for storm damage and clear any blockages. Clean and service air conditioning units after months of heavy monsoon use. Check walls, closets, and under sinks for water damage, mould patches, or damp spots. Treat any mould immediately with antifungal cleaners.

December

Ideal weather for a deep clean — open windows and let everything dry out. Inspect exterior paint for peeling or bubbling caused by monsoon moisture. Service water heaters before cooler evenings (Bangkok does get cool enough for hot showers in December). Check window and door seals for gaps that let in both air and pests.

January

Wash and store monsoon gear. Inspect wooden furniture and flooring for warping or termite damage — both common after Bangkok's wet season. Clean ceiling fans and light fixtures that accumulated dust during months of closed-window air conditioning. Power wash driveways, fences, and patios while the weather is dry.

February

Treat gardens and outdoor areas with pest prevention — this is when ants and termites become active again. Check outdoor furniture for rust or deterioration. Inspect plumbing for mineral buildup. Begin preparing AC systems for the upcoming hot season — book your servicing appointment now before the rush.

Hot Season (March - June)

March

Full air conditioning service and filter replacement — critical before peak heat arrives. Check refrigerator seals and efficiency as temperatures rise. Inspect your roof for cracks that could worsen with heat expansion. Apply UV-protective coatings to exterior wood surfaces to prevent sun damage.

April (Hottest Month — up to 40°C)

Monitor electricity usage and check wiring for overloaded circuits — AC and fans running 24/7 puts strain on your electrical system. Install or check window UV film to reduce indoor heat. Service ceiling fans and ensure they're running efficiently. Inspect water tanks and pipes for heat-related expansion.

May

Pre-monsoon preparation is critical. Clear all gutters, drains, and downspouts before the first rains. Check roof tiles and flashing. Apply waterproof sealant to exterior walls, especially north-facing surfaces. Trim trees and branches near the house to prevent storm damage. Stock up on sandbags if you're in a flood-prone area.

June (Monsoon Begins)

Verify that sump pumps and drainage systems are operational. Check all windows and doors for water-tight seals. Start running dehumidifiers to keep indoor humidity below 50%. Inspect and clean gutter guards. Apply anti-fungal treatments to bathrooms and moisture-prone areas before the humidity peaks.

Rainy/Monsoon Season (July - October)

July

Weekly gutter and drain checks during heavy rain periods. Monitor walls and ceilings for new water stains or leaks. Keep dehumidifiers running — humidity peaks at 75-80%. Wipe down leather goods, books, and wooden surfaces to prevent mould. Open windows when rain stops to ventilate.

August

Mid-monsoon roof inspection — address any leaks immediately before they worsen. Clean and treat any mould within 24-48 hours of appearance. Check electrical outlets and wiring near external walls for moisture damage. Inspect ground-floor areas for rising damp.

September (Peak Humidity — 79%)

The highest mould risk month in Bangkok. Apply anti-fungal coatings to vulnerable areas — bathrooms, under sinks, behind furniture. Check clothes closets and storage areas for musty smells or visible mould. Ensure garden soil slopes away from your foundation. Clean AC filters monthly during monsoon — they're working overtime.

October (Monsoon Ends)

Final gutter and drainage cleanout. Comprehensive mould and damp inspection of the entire property. Check for termite activity — termites are most active after monsoon season. Assess exterior paint and sealant condition. Plan repairs and maintenance for the upcoming dry season when work is easier and contractors are less busy.

Year-Round: Pest Prevention

Every season in Bangkok brings pest challenges. The hot season drives cockroaches indoors seeking water. Monsoon humidity attracts ants, centipedes, and mosquitoes. The cool season sends rodents looking for warmth. Year-round pest prevention isn't optional in Bangkok — it's essential home maintenance.

Khun Clean's natural pest treatment fits perfectly into your maintenance calendar. Our food-safe diatomaceous earth provides lasting protection that works in every season. We recommend treatment at key transition points — before monsoon (May), after monsoon (November), and whenever you notice increased pest activity.

Book a free inspection and add Khun Clean to your Bangkok home maintenance routine.

Home Maintenance Calendar for Bangkok Weather