Keeping Kids Hydrated in the Summer Heat

As temperatures rise and outdoor activities increase during the warmer months, keeping kids properly hydrated becomes more important than ever. Children are naturally active and may not always recognize the signs of dehydration — especially when they’re busy playing in the sun.

Cynthia Seitz, MD, a pediatrician at Kaiser Permanente’s Orchards Medical Office in Vancouver, WA, answers common questions and shares tips to help keep kids healthy this summer — and all year round.

Why is hydration particularly important for children during the summer months?

The human body is mostly water. Staying well-hydrated improves mood, concentration, attention, and physical fitness. Hydration also plays a key role in regulating body temperature and maintaining blood flow to organs and skin. During summer, increased activity levels and higher temperatures and humidity raise the body’s need to sweat. Sweating is a primary method of cooling, but effective heat loss through evaporation requires adequate hydration.

For babies and toddlers, caregivers should watch for fewer wet diapers, fussiness, flushed or sweaty skin, low energy, and a lack of tears when crying. Older children may complain of headaches, lightheadedness, muscle cramps or weakness, and a rapid pulse.

Our bodies lose water daily through urination, breathing, and sweating. We replenish these losses by drinking fluids and eating water-rich foods. Inadequate fluid intake reduces heat tolerance and increases the risk of exhaustion during exercise and play.

What are the signs and symptoms of dehydration in children?

Dehydration occurs when the body doesn’t have enough water to carry out normal functions. In children, this often happens when fluid loss — such as from vomiting or excessive sweating — exceeds intake, especially during hot, humid days.

One of the easiest ways to monitor hydration is by checking urine color. Pale urine is a sign of good hydration, while darker yellow suggests a hydration gap. Dark yellow or brown urine is more concerning and may indicate serious dehydration.

How much water should children drink each day, and does this change in summer?

Vancouver summers bring added heat, humidity, and increased solar radiation — all of which raise the risk of heat-related illness. Caregivers can help reduce this risk by scheduling regular hydration breaks during busy summer days.

Hydration needs vary based on a child’s activity level, the environment, and their overall health. A general age-based guide for daily fluid intake (in 8-ounce cups) is:

• 1-3 years old: 4 cups per day
• 4-8 years old: 5–6 cups per day
• 9-13 years old: 7–8 cups per day
• 14-18 years old: 8–11 cups per day

What are some effective strategies to encourage kids to drink more water?

Caregivers can build healthy hydration habits by making water easily accessible throughout the day. Start with a morning glass of water, and give each family member a refillable bottle.

Make it fun! Let kids choose their own bottle or cup. Younger children may enjoy silly straws and bright colors, while older kids might like customizing trendy bottles. For outdoor adventures, hydration backpacks are a great option.

Add variety with fruit- or veggie-infused water, fun-shaped ice cubes, or hydrating snacks like melon, berries, cucumbers, and citrus. Smoothies, soups, and homemade popsicles also boost fluid intake and provide natural electrolytes.

Are there specific foods or drinks that help with hydration—and any to avoid?

Coconut water is a great base for smoothies and popsicles, packed with electrolytes that support muscle recovery. For kids who enjoy variety, lemon-infused water and herbal teas offer flavorful, caffeine-free options.

Pediatricians and dentists recommend limiting fruit juice — even 100% juice — due to its high sugar content. Sugary drinks should be occasional treats, like candy, as added sugars can lead to weight gain, cavities, and type 2 diabetes.

Teens are increasingly drawn to energy and coffee drinks. However, caffeine can cause anxiety, poor sleep, digestive issues, and even heart rhythm problems. Encourage healthier, caffeine-free alternatives instead.

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