Why does my tent get condensation?

Each person exhales approximately 40g of moisture per hour while sleeping. In a sealed tent, this moisture hits the cold flysheet and condenses into water droplets. Factors that increase condensation: cold temperatures, high humidity, more occupants, wet gear inside, and poor ventilation.

How do I reduce tent condensation?

Open all vents and door panels as wide as weather allows. Keep wet gear in the vestibule. Never cook inside. Pitch in a slight breeze rather than a dead-calm hollow. Wipe the inner flysheet with a small microfibre cloth in the morning. Some condensation is inevitable — a double-wall tent helps keep drips off you.

Is a single-wall or double-wall tent better for condensation?

Double-wall tents are far better for condensation management. The flysheet collects condensation away from you, while the inner mesh allows airflow. Single-wall tents (common in ultralight designs) put condensation right next to your sleeping bag. In the UK climate, double-wall tents are strongly recommended.

Does tent colour affect condensation?

Indirectly, yes. Dark-coloured tents absorb more solar heat, which helps dry condensation in the morning sun. Light-coloured tents stay cooler but dry slower. Green and brown tents (common in the UK) are middle ground. The main factors are ventilation design and occupancy, not colour.

CampCalcs

Tent Ventilation Calculator

Estimate ventilation requirements to reduce condensation inside your tent.

Occupants

Tent Volume

Approximate internal volume

Outside Temperature

Number of Vents

Humidity

How We Calculate This

Moisture Production

Moisture = Occupants x 40g/h x Humidity factor

Ventilation Requirements

Minimum vent area = Occupants x 100cm²

Minimum 2-3 air changes per hour needed for comfort. Cross-ventilation (two or more vents on opposite sides) is most effective.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify conditions and use proper safety equipment outdoors.