Things You'll Need
An overly humid garage can lead to the growth of mold and other damage to items stored inside. It's incredibly easy for a garage to grow humid, especially in hot and rainy weather, so it's ideal to dehumidify the room to protect your home and possessions.
Close your garage doors and windows (if applicable) in order to prevent any more moisture from getting in.
Set up a dehumidifier in your garage and let it run regularly. Be sure to check the water collection tank, as a dehumidifier sucks water out of the air and stores it into a tank that must be emptied regularly. If necessary, use an extension cord to plug the dehumidifier in.
Set up a space heater to help dry out any remaining dampness and to speed up the process. When using a space heater, make sure to monitor it to be sure there isn't a risk of fire, as they can grow very hot. Use an extension cord if necessary, and keep the space heater running until the garage is dry.
Maintain and run the dehumidifier in the garage regularly to keep the garage from growing humid again.
Check your garage carefully for mold or water damage and call a professional if you find mold growth that is beyond your control. Avoid using electrical appliances such as space heaters and extension cords around puddles of water. Wear proper safety equipment such as rubber gloves and dry the area thoroughly before using electrical items.