Hair-care products that help beat the effects of heat and humidity on your tresses.

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In summer, you may wear lighter make up, or go heavier on the self-tanner. But for hair, in particular, switching up one’s routine with the season makes sense.

“What you do in the wintertime is not what you’re going to do in the summer,” says Eva Scrivo, a salon owner in Manhattan. She suggests washing your hair less frequently, because natural oils can help prevent the onset of frizz when humidity levels are high.

Goldwell Kerasilk Control Smoothing Fluid ($26 at haircareusa.com) is part of a new collection of products introduced this month that aim to tame frizz and smooth the hair with ingredients such as silk and glyoxylic acid. It can be used on either dry or damp hair to counteract the effects of humidity.

Also new this month is the Kérastase Nutritive Magistral Collection, which targets dryness and damage from factors like sun exposure. The line’s formulas include benjoin tree resin, sourced from Laos and Indonesia, to fortify the hair. All promise to leave the hair moisturized for three days. A standout is the Nutrive Masque Magistral ($63 at kerastase-usa.com), which was designed for thick locks but can help smooth any hair that’s parched.

The new Rahua Elixir Daily Hair Drops ($105 at rahua.com) promise to help repair hair that’s been damaged from the sun. Like the company’s other products, this one is made with ungurahua oil from the Amazon. It can be applied to the scalp or the hair itself, especially at the ends.

Ouidad, which specializes in products for curly hair, introduced Curl Immersion Hi-Defining Custard ($28 at ouidad.com) this month. It includes moisturizing coconut oil as well as Kalahari melon-seed oil to fortify the hair and maintain curly and wavy shapes. The thick gel has a light feel and delivers significant hold on humid days for even very curly hair.

Philip Kingsley Citrus Sunshine Swimcap ($22 at philipkingsley.com) is a new iteration of the popular Swimcap conditioning treatment, originally created in 1984 for the U.S. Olympic synchronized swimming team. Like its predecessor, it is meant to be used on damp hair to thwart the effects of chlorine and sun. This version is lightly fragrant with notes of orange and bergamot.