A wet towel may help slightly, but it will not cool a room very much.
This answer is focused on the practical result, the safest way to handle it, and what changes to expect afterward.
Can you use a wet towel to cool a room?
TL;DR
Quick answer. A wet towel may help slightly, but it will not cool a room very much.
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A wet towel may make air feel slightly cooler if a fan blows across it, but it is not a strong way to cool a room.
The effect depends on evaporation. In humid rooms, evaporation is slower, and the towel may just make the room feel more damp.
For better results, block sunlight, improve airflow, use a fan, open windows when outside air is cooler, or reduce humidity.
A wet towel may help slightly, but it will not cool a room very much. The best result comes from handling it the right way instead of guessing.
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