Hot Weather and Hair Growth
A: There’s no concrete evidence that supports the idea of hair growing faster in hot weather, although a lot of people swear by this. One thing that can be proven is that hair does grow at its fastest during summer. Thus, it is easy to make the assumption that hair grows faster in “hot weather”, when it actually has to do with the effect that the turn of the seasons have on our bodies.
This means that during the summer, lots of hormones are released to enhance your performance to optimum levels. All these hormones and consequent systematic changes have a huge impact on secondary processes, such as hair that grows faster, etc.
Also, hair tends to get greasier during the summer, due to sweat, heat, exertion, etc. Although this may sound really gross; hair actually grow faster and is stronger when it’s “dirty”. The extra sebum and hair-oil gathering on the hair nourishes it, making it stronger and helping it to grow. Lots of celebrities swear by this. Reese Witherspoon is infamous for having some of the most beautiful hair in the industry, but only because she refuses to wash it more than once a week.
Thus, in summer months, hair tends to become greasier faster. Lots of people also don’t see the point of blowdrying their hair during these months, as it’s too hot in any case. Thus, women tend to tie their hair up and wash it less often, which will also increase the growth rate.
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See also:
How fast does hair grow?
Does different people's hair grow at different speeds?
Does the sun make your hair grow faster?
Does short hair grow faster than long hair?