Apple Watch is designed to work best in ambient temperatures between 32° to 95° F (0° and 35° C), and should be stored between ambient temperatures of -4° and 113° F (-20° and 45° C). For example, Apple Watch shouldn’t sit unattended in direct sun for long periods or be left in a car on hot days. Storing and using your device outside of the recommended temperature range could shorten its battery life or cause other damage.
Learn about temperature management for Apple Watch
If necessary, Apple Watch will regulate its internal temperature. There are several things you might notice if this happens:
- Charging times might increase, or charging might stop.
- The display might dim.
- Data transfers could pause or slow down.
- Apps might close.
- On cellular models of Apple Watch, you might not have a cellular connection or you might not be able to make or receive calls. When this happens, the cellular button in Control Center appears red. Normal cellular functionality resumes after Apple Watch cools. However, you can still make emergency calls.
If your Apple Watch experiences above-normal temperatures, it displays only a red thermometer and the time.
Here's what to do:
- If you're wearing your device, remove it from your wrist. If your Apple Watch is in the process of charging, remove it from its charger. Your watch automatically turns off a few seconds after displaying the thermometer. If you leave your watch on the charger, your watch won't turn off. If you try to turn your watch back on, the red thermometer will appear again.
- Move your Apple Watch to a cooler place and let it cool down before putting it back on or continuing to charge it. When your watch cools down, it automatically turns back on.
- If you're making cellular calls on a cellular model of Apple Watch in an area with a weak cellular signal, move to a location with a stronger signal.
Handle your Apple Watch and its accessories safely
Apple Watch, its power adapter, and Apple Watch Magnetic Charging Cable follow applicable surface-temperature standards and limits. Even within these limits, sustained contact with warm surfaces for long periods of time might cause discomfort or injury.
Here are some safety tips:
- Be aware that Apple Watch, its power adapter, and Apple Watch Magnetic Charging Cable warm up when plugged in to a power source.
- If plugged in, Apple Watch, Apple Watch Magnetic Charging Cables, and power adapters shouldn't be in prolonged contact with skin.
- While charging, Apple Watch, its power adapter, and Apple Watch Magnetic Charging Cable should stay in a well-ventilated area. For example, if these devices are charging or plugged in to power sources, they shouldn't be covered.
- Use of cellular on cellular models of Apple Watch may make the device feel warm.
- Take off your Apple Watch if it becomes uncomfortably warm. Take special care if you have a physical condition that affects your ability to sense heat against the body.
Apple Watch, its adapter, and Apple Watch Magnetic Charging Cable meet the standard for Safety of Information Technology Equipment, IEC 60950-1:2005+A1:2009+A2:2013. Many countries and regions have adopted this safety standard. For example, it’s referred to as:
- UL 60950-1 in the United States
- CSA 60950-01 in Canada
- EN 60950- in Europe
- AS/NZS 60950:1 in Australia and New Zealand