# Ball up and soak a t-shirt in the sink, wring it out, put it on and sit in a lawn chair (or other chair that lets air through to you) in front of a fan. Re-wet as it dries. Make sure not to soak it with cold water. It can be colder than you think. Instead use lukewarm water so you get cool without freezing. Using a synthetic shirt will ensure no "wet T-shirt" look.
# Nothing: If you're in a situation where you can go without clothes, this can be the most comfortable, natural way to stay cool.
# Go downstairs. Warm air is less dense than cooler air so it ends up layered on top of the downward moving cooler air. If you're in a house, for example, get lower than the roof. Make your way to the basement or lower level. It will be cooler there. Position a fan in an upstairs window to draw off heat collected in upper rooms--set it up so that it sucks air from indoors and pushes it outdoors.
# Use a hint of mint.Try a few minty or menthol products to cool your skin: slather on lotion with peppermint (avoid your face and eyes), shower with peppermint soap, use a minty foot soak, and powders with mint. Mint refreshes the skin and leaves a nice cooling sensation.
# Breathe like a dog. Try the [[Breathe Like a dog} Roll your tongue into a tube with the tip outside the mouth. Continuing slow deep breath, breath in through the tube and then move your chin to your chest as you breath out through your nose. Do that 5-10 times and you should start to feel cooler. Dogs often use their tongues to cool themselves; perhaps this yoga practice comes from noticing that.
# Eat spicy food. It's not a coincidence that many people in hotter regions of the world eat spicy food. Spicy (hot to the taste) food increases perspiration which cools the body as it evaporates. It also can cause an endorphin rush that is quite pleasant and might make you forget about the heat.
# Think cool. Read books about climbing Mount Everest, visiting Norway, or watch "March of the Penguins", "Ice Age", or "The Day After Tomorrow". You might not be physically cooler, but if your mind envisions a cold environment, you might feel a bit cooler.
# Sit Still. Do not try to fan yourself because it can make you hotter. Trying to move while feeling hot can make you feel hotter.
# Cool as a cucumber! Slice a thin piece of cold cucumber (from the fridge or a cooler) and stick it in the middle of your forehead! This feels fantastic on a hot day or when stuck in a hot car, and works almost immediately!
Source;
How to Cool Yourself Without Air Conditioning - wikiHow