Is it dangerous to be outside at all when pregnant in summer?

Being outdoors is fine when you plan around the heat. Aim for the cooler morning or evening hours, stay in the shade, drink water steadily, and head indoors or to a cooling spot during the hottest part of the day. The goal is to avoid overheating and getting dehydrated, not to stay locked inside. Call your provider if you start feeling unwell in the heat.

How much water should I drink in extreme heat?

Sip steadily through the day rather than waiting until you feel thirsty, since thirst is a late sign. A good check is your urine: pale yellow usually means you are hydrated, while dark yellow means you need more fluids. If you are sweating heavily for long stretches, ask your provider whether an electrolyte drink fits your situation. Water is the main thing your body needs.

What is the difference between heat exhaustion and heat stroke?

Heat exhaustion is the warning stage, with heavy sweating, cool clammy skin, weakness, headache, dizziness, and nausea, and it usually improves with rest, shade, and fluids. Heat stroke is a 911 emergency: confusion, fainting, a very high temperature, and skin that is hot and may be dry because sweating has stopped. According to the CDC, heat stroke needs emergency care immediately, so call 911 and start cooling the person while you wait.

I work outside. What rights do I have to water, rest, and shade?

OSHA addresses heat for outdoor workers and emphasizes access to water, rest, and shade, and some states including California have their own heat rules for outdoor work. It is reasonable to ask for water breaks, a shaded place to rest, and a slower pace, and to build up gradually if you are new or returning. If you feel pushed past what is safe, OSHA or your state labor agency can explain your protections, and your provider can advise what is safe for your pregnancy.

Pregnancy health

Extreme heat and pregnancy: staying safe through a hot summer

June 29, 2026 · 8 min read

If you are pregnant through a desert or valley summer, the heat is not just uncomfortable, it asks more of your body than usual. Pregnancy raises your blood volume and makes your body work harder to stay cool, so overheating and dehydration come on faster and matter more. This guide is for families in the hot border corridor of Arizona, the Imperial and Central Valleys of California, and South and West Texas, where many parents also work outdoors. It explains why heat is riskier in pregnancy, what the CDC and ACOG say, simple cooling and hydration steps, and the warning signs that mean call your provider or call 911. This is general education, not medical advice, so call your provider about anything that worries you.

A mother and her child bathed in warm natural light

Why heat hits harder when you are pregnant

Your body is already doing extra work before the temperature climbs. During pregnancy your blood volume rises, your heart pumps more, and your resting body temperature runs a little warmer, so you generate more internal heat than usual. At the same time, the main ways the body sheds heat, sweating and moving blood toward the skin, have to compete with the demands of pregnancy. The result is that you can overheat and become dehydrated faster than you would have before, and you may not feel it coming until you are already lightheaded or queasy. A growing belly also makes it harder to cool down by moving around, and nausea or a smaller stomach can cut how much you drink. None of this means you cannot enjoy summer. It means the ordinary heat advice you have heard, drink water, find shade, slow down, counts double now, and getting ahead of the heat is easier than recovering from it.

What the CDC and ACOG say about heat in pregnancy

Public health bodies treat pregnant people as a group that is more sensitive to extreme heat. The Centers for Disease Control and Prevention (CDC) lists pregnancy among the conditions that raise the risk of heat-related illness and urges extra care during heat waves. Both the CDC and the American College of Obstetricians and Gynecologists (ACOG) note that a sustained high core body temperature, especially in early pregnancy, has been associated with risks to fetal development, which is why avoiding overheating is worth real attention rather than worry. The practical takeaway from these bodies is not alarm, it is prevention: stay hydrated, stay out of the worst heat, and cool down quickly if you start to overheat. Keeping your core temperature from climbing and staying high is the goal. If you ever feel feverish, very hot, or unwell in the heat, that is a reason to cool off, drink fluids, and call your provider rather than push through.

Practical ways to stay cool and hydrated

Build your day around the cooler hours. Run errands, walk, or do yard and garden work early in the morning or after the sun drops, and treat midday and early afternoon as time to rest indoors. Keep water with you and sip steadily through the day instead of waiting until you are thirsty, since thirst is a late signal. Water is the workhorse, and if you are sweating a lot you can ask your provider whether an electrolyte drink fits your day. Use air conditioning when you can, and if your home gets too hot, a public library, mall, community center, or an official cooling center can be a free place to cool down. Loose, light-colored clothing, a wide hat, a cool shower, and a damp cloth on your neck all help. One rule has no exceptions: never stay in a parked car, and never leave a child in one, even for a minute, because the inside of a car heats to dangerous levels fast even with windows cracked.

Heat exhaustion versus heat stroke: knowing the difference

Heat illness runs along a line, and catching the early end keeps you off the dangerous end. Heat exhaustion is the warning stage: heavy sweating, cool and clammy skin, weakness or tiredness, headache, dizziness, nausea, muscle cramps, and a fast, weak pulse. If that happens, stop, get to shade or air conditioning, sit or lie down, loosen your clothes, sip water, and put cool cloths or a fan on your skin. You should start to feel better within a short time. Heat stroke is a medical emergency and looks different: confusion or slurred speech, fainting or not waking up, a very high temperature, and skin that is hot and may be red and dry, sometimes with sweating that has stopped. According to the CDC, heat stroke is a 911 emergency. Call 911 right away, move the person to a cooler place, and cool them with water, wet cloths, or ice packs while you wait. Do not wait to see if it passes.

If you work outdoors or in the fields

Parents who do farm, construction, landscaping, kitchen, or warehouse work face the heat for hours at a time, and pregnancy adds to the load. The U.S. Occupational Safety and Health Administration (OSHA) addresses heat for outdoor and indoor workers and centers its guidance on three things: water, rest, and shade. In practice that means drinking small amounts of water often, taking breaks in the shade or a cooled space, and pacing the work rather than racing through the hot part of the day. It is reasonable to ask for those breaks and a shaded spot, and to tell a supervisor you are pregnant if you feel comfortable doing so, since you may need to slow down or step out of direct sun. New workers and anyone returning after time off need to build up to full heat exposure gradually. California and other states have specific heat rules for outdoor workers. If you are unsure of your rights or feel pushed past what is safe, OSHA and your state labor agency can explain what protections apply, and your provider can advise on what is safe for your pregnancy.

Dehydration, fetal movement, and when to call your provider

Dehydration sneaks up in the heat, so learn its signals: a dry mouth, dark yellow urine or going less often, headache, dizziness, a racing heart, and feeling unusually tired. In pregnancy, getting too dry can also trigger contractions, including Braxton Hicks tightenings that may ease once you rest and drink, but that are still worth paying attention to. Move to a cool place and sip fluids steadily. Call your provider if drinking does not help, if you cannot keep fluids down, if you feel faint, or if contractions keep coming or grow regular and stronger, since that can be a sign of preterm labor and needs to be checked. Pay attention to your baby too. If you notice fewer movements than usual, especially later in pregnancy, drink water, lie on your side, and count kicks, and call your provider if movement still seems reduced. When in doubt, it is always reasonable to call. For confusion, fainting, a very high temperature, severe shortness of breath, or any sign of heat stroke, call 911.

How Materna fits in

Materna does not provide medical care or replace your provider, and it does not treat heat illness. What Materna does is keep your pregnancy in one organized place, in English or Spanish, so you can track your hydration, your symptoms, your baby's movements, and your appointment notes, and bring that history to whatever provider you see. The Mommy Passport is free for patients, paid for by providers, and Spanish-first, and clinical and safety content like this is never behind a paywall. Materna serves families in Arizona, California, Texas, and Pennsylvania. None of this is a substitute for medical care: for symptoms that worry you, call your provider; for an emergency such as confusion, fainting, or signs of heat stroke, call 911; and for thoughts of harming yourself or a mental-health crisis, call or text the 988 Suicide and Crisis Lifeline. For coverage or eligibility questions, contact your state Medicaid agency.

Track your pregnancy and stay organized through summer with Materna

Frequently asked questions

Is it dangerous to be outside at all when pregnant in summer?: Being outdoors is fine when you plan around the heat. Aim for the cooler morning or evening hours, stay in the shade, drink water steadily, and head indoors or to a cooling spot during the hottest part of the day. The goal is to avoid overheating and getting dehydrated, not to stay locked inside. Call your provider if you start feeling unwell in the heat.
How much water should I drink in extreme heat?: Sip steadily through the day rather than waiting until you feel thirsty, since thirst is a late sign. A good check is your urine: pale yellow usually means you are hydrated, while dark yellow means you need more fluids. If you are sweating heavily for long stretches, ask your provider whether an electrolyte drink fits your situation. Water is the main thing your body needs.
What is the difference between heat exhaustion and heat stroke?: Heat exhaustion is the warning stage, with heavy sweating, cool clammy skin, weakness, headache, dizziness, and nausea, and it usually improves with rest, shade, and fluids. Heat stroke is a 911 emergency: confusion, fainting, a very high temperature, and skin that is hot and may be dry because sweating has stopped. According to the CDC, heat stroke needs emergency care immediately, so call 911 and start cooling the person while you wait.
I work outside. What rights do I have to water, rest, and shade?: OSHA addresses heat for outdoor workers and emphasizes access to water, rest, and shade, and some states including California have their own heat rules for outdoor work. It is reasonable to ask for water breaks, a shaded place to rest, and a slower pace, and to build up gradually if you are new or returning. If you feel pushed past what is safe, OSHA or your state labor agency can explain your protections, and your provider can advise what is safe for your pregnancy.