School Outdoor Activity in Heat: Roles, Breaks, and Communication

By the Healthy Learning Environments Guide Team

Picture a typical early-fall school day. The forecast calls for heat by midday, recess and PE are both outside, and one student in class has asthma. Who decides whether activity changes? Who watches for warning signs? And how does the family find out what happened?

Here is the short answer. Safe outdoor activity in heat depends on three things. First, clear roles, meaning who checks the forecast, who watches students, and who responds. Second, planned breaks with shade and water. Third, fast, simple communication between school staff, the school nurse, and families. This guide turns CDC guidance into stages, warning boundaries, and a decision path you can use to build a checklist or prepare questions for your school.

This guide is general education. It does not replace a student’s health care plan, a clinician’s advice, or your school’s or district’s own heat policy.

First: Emergency Warning Signs That Cannot Wait

CDC heat-safety guidance written for workplaces lists these as signs of heat stroke, the most serious heat-related illness:

• Confusion, altered mental status, or slurred speech
• Loss of consciousness
• Seizures
• Hot, dry skin or heavy sweating
• Very high body temperature

For these signs, that guidance says to call 911, stay with the person until emergency help arrives, move them to a shaded, cool area, and cool them with cold water or cold, wet cloths on the skin. In an emergency, call 911 or your local emergency number first. After that, follow your school’s emergency procedures.

Why Heat Planning Matters for Students

CDC names several groups at higher risk during hot weather. Among them are:

• People with asthma, especially children
• Infants and young children, who CDC notes “rely on others to keep them cool and hydrated”
• People with heart disease
• People who exercise or work outdoors, including athletes

CDC also notes that many medicines can make people dehydrated or overheated on hot days. A student’s health plan and medicines may matter when the school plans activity on hot days. Only the family and the student’s health care provider should interpret this for a specific child, with the school nurse involved.

Who Does What: The Roles in a Heat-Aware School Day

CDC’s school health materials describe shared responsibility. School health services staff can help all students with preventive, acute, and emergency care. School nurses coordinate care for students with chronic conditions such as asthma, diabetes, or epilepsy. CDC also notes that the school nurse “may be the only on-site health professional who is formally trained to respond to a medical crisis.”

Here is how those roles can map onto a hot day. Your school may assign them differently.

School leaders and administrators

• Know the school’s or district’s written heat policy, if there is one
• Name who checks the forecast and who has authority to change outdoor plans
• Make sure staff know the emergency procedure

School nurse or health services staff

• Coordinate with families of students who have chronic conditions and health care plans
• Serve as a point of contact when a student shows symptoms
• Support the timely delivery of medicine, as CDC describes

Teachers, recess supervisors, PE staff, and coaches

• Run breaks, water access, and shade during activity
• Watch for warning signs and act on them without waiting
• Know who to call and where the cool-down space is

Families

• Share health updates with the school nurse, especially changes in conditions or medicines
• Send students with a water bottle and loose, lightweight, light-colored clothing when the school allows it
• Ask how the school communicates heat-related changes and incidents

Students (as appropriate for age)

• Speak up when they feel dizzy, weak, sick, or crampy
• Look out for classmates. CDC’s athlete guidance suggests people “monitor a teammate’s condition, and have someone do the same for you.”

Stage 1: Before the Hot Season

• Find the written policy. Ask whether your school or district has a heat or outdoor activity policy, and what it says.
• Update health information. CDC notes that good family–nurse communication supports health status updates and timely delivery of medicine. Early in the season is a practical time for that conversation.
• Review health care plans. For students with asthma, heart conditions, or other chronic conditions, families and the school nurse can talk about whether the plan covers hot-weather activity.
• Consider training. CDC points coaches, teachers, parents, and high school athletes to a training course on recognizing heat-related illness.

Stage 2: The Morning of a Hot Day

• Check the local forecast. CDC’s HeatRisk Dashboard gives a heat-risk forecast and recommended actions for a zip code. CDC also suggests checking air quality levels.
• Consider timing. CDC advises scheduling workouts and practices earlier or later in the day when the temperature is cooler.
• Confirm the basics. Is there shade, a water source, and a cool indoor space ready?

Stage 3: During Outdoor Activity

• Pace activity and build in breaks. CDC advises starting slowly and picking up the pace gradually.
• Use shade. CDC advises staying in the shade as much as possible.
• Keep water close. CDC advises athletes to drink more water than usual and not wait until they feel thirsty.
• Watch clothing. CDC advises loose, lightweight, light-colored clothing.

Stage 4: After Activity and After an Incident

• Cool down indoors when possible. CDC says to use fans only when indoor temperatures are below 90°F. Above that, a fan can raise body temperature.
• Tell the family. If a student had symptoms, a clear note or call helps the family decide on follow-up care with their health care provider.
• Review what happened. Staff can look at what worked, what was slow, and what should change next time. Student health details should stay private and follow the school’s policies.

Warning Boundaries: When to Stop and When to Call 911

These groupings follow CDC’s warning signs. They are not a medical triage tool. When in doubt, get medical help.

Stop activity, move to a cool place, and get health help now

CDC lists these as signs of overheating or heat exhaustion. CDC notes that muscle cramps may signal early heat-related illness.

• Muscle cramps
• Unusually heavy sweating
• Thirst
• Dizziness or headache
• Weakness or fainting
• Nausea
• Shortness of breath

CDC’s guidance for athletes says anyone who faints or feels weak should stop all activity and get to a cool place. CDC also advises getting medical care right away when a child has symptoms of heat-related illness. At school, that usually means bringing in the school nurse or health services staff immediately.

Call 911

• Confusion, slurred speech, or acting unlike themselves
• Loss of consciousness
• Seizures
• Very high body temperature

A Simple Decision Path for a Hot Day

1. Is anyone showing emergency signs right now? If yes, call 911 and start cooling. If no, go to step 2.
2. What does the local forecast show? Check the HeatRisk Dashboard and your school’s policy. If the policy calls for changes at that level, follow it.
3. Who is at higher risk today? Students with asthma, heart conditions, or health care plans may need their plan followed closely. Loop in the school nurse.
4. Can activity move to a cooler time, place, or pace? Earlier or later timing, shade, and a slower start are the options CDC points to.
5. Are breaks, water, and shade in place? If not, fix that before activity starts.
6. Who is watching, and who do they call? Name the person and the path before students go outside.
7. Who tells families, and when? Decide this before an incident, not during one.

Communication Questions Families and Staff Can Ask

For families to ask the school

• Does the school or district have a written heat policy for recess, PE, and athletics?
• Who decides when outdoor activity changes, and what information do they use?
• How will I be told if my child showed heat-related symptoms?
• Does my child’s health care plan cover hot-weather activity? Should we review it with the school nurse?
• Can my child carry a water bottle during outdoor activity?

For staff to ask each other

• Who checks the forecast each morning during hot months?
• Where is the nearest cool indoor space from each outdoor area?
• Does every supervisor know the warning signs and the emergency steps?
• Which students have health care plans the supervising adult should know about, within privacy rules?

What the Evidence Does and Does Not Tell Us

• Verified: CDC identifies people with asthma (especially children), infants and young children, people with heart disease, and athletes among higher-risk groups. It lists the warning signs above and gives the shade, water, clothing, pacing, and timing guidance described here.
• Verified: CDC describes school nurses as care coordinators for students with chronic conditions, and notes that family–nurse communication supports health updates and timely delivery of medicine.
• Not covered by these sources: The CDC pages used here do not set a single temperature cutoff for canceling school recess or PE. Those decisions usually depend on local policy, so check with your school or district.
• Note on first aid: The heat stroke and heat exhaustion details come from CDC guidance written for workplaces. School staff should follow their own emergency procedures and training.

How This Guide Was Built

Healthy Learning Environments Guide is an independent educational publication. We are not a school district, public agency, or health care provider. We are not connected to any organization that used this web address before. This article summarizes publicly available CDC guidance, and every factual claim above traces to one of the sources below.

Sources

• CDC: Managing Health Conditions in Schools (last reviewed October 18, 2024)
• CDC: About Heat and Your Health (last reviewed July 20, 2026)
• CDC: School Health Services (last reviewed July 5, 2024)
• CDC: Heat and Athletes (last reviewed June 25, 2024)
• CDC: Heat and Infants and Children (last reviewed June 25, 2024)
• CDC/NIOSH: Heat-Related Illnesses (last reviewed March 3, 2026)
• CDC HeatRisk Dashboard

Educational Disclaimer

This article is for general education only. It is not medical advice, diagnosis, or treatment, and it does not replace a student’s health care plan, guidance from a licensed health care provider, or your school’s or district’s policies. Do not change any medicine or health plan based on this article. In an emergency, call 911 or your local emergency number.