As per wellhealthorganic.com: which-is-better-hot-water-or-cold-water-bath:

As summer approaches and temperatures rise, many of us tend to turn our showers towards cold water; conversely, warm showers in wintertime can be very refreshing. But is it always beneficial? Well, according to Ayurveda there is no definitive answer; hot water should be used for bathing your body parts while cold water for washing the head. When making this decision it’s important to consider factors like age, constitution, habits, diseases (if any), season and other aspects.

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Let’s take a closer look:

Age: Young children and elderly individuals benefit more from warm to hot water baths. Teenagers and people up to 45-50 years can take advantage of cold water baths. Furthermore, students who require alertness in order to focus on their studies would find benefit in taking a cold water bath.

Constitution: According to Ayurveda, there are three basic doshas: Vata, Pitta and Kapha. If your body type is Pitta then bathing with cold water works better for you; on the other hand if it’s Vata or Kapha then taking a hot water shower would be beneficial for you.

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Habits: Your bathing habits can also influence the temperature of the water. If you prefer taking a cold water bath in the morning, opt for cold water. However, if you prefer bathing in the evening, try going with hot water as this time of day tends to have more Vata dosha present. Additionally, if you like exercising before taking a bath, make sure that it is done with warm water.

Diseases: If you are suffering from diseases caused by an imbalance of Pitta dosha, bathe with cold water. Such diseases include indigestion and liver disorders. Conversely, if Vata or Kapha doshas are out of balance, then bathe in hot water. Common ailments caused by Vata imbalance include arthritis, joint pain and foot pain while those caused by kapha dosha imbalance include respiratory illnesses and allergies.

Some Ayurvedic practitioners recommend alternating between hot and cold baths. It’s essential that you don’t bathe with water that’s either too hot or too cold, as either can damage your skin’s pH level; conversely, bathing in too cold water could make you susceptible to getting a cold. If you have any doubts or inquiries, consult an expert for answers to your queries.

Source: wellhealthorganic.com: which-is-better-hot-water-or-cold-water-bath