iPhone doesn't have a built-in thermometer app
Your iPhone cannot measure the temperature of the air around you or objects near it. Apple does not include a thermometer sensor in any iPhone model, and no standard iPhone app can read external temperature.
What your iPhone can do is tell you its own internal temperature — how hot the device itself is running. This is useful information if your phone feels warm to the touch and you want to know whether it's overheating or just warm from normal use.
If you need to measure room temperature or outdoor temperature, you'll need a separate device: a dedicated thermometer, a weather station, or a smartphone from another manufacturer that includes a temperature sensor (some Samsung and Google Pixel phones have them).
Key Takeaways
- iPhones have no built-in thermometer to measure air or object temperature, and no standard app can add this feature.
- You can check your iPhone's internal device temperature through Settings > General > About, though Apple does not display this as a single number.
- A warm iPhone during heavy use (gaming, video, navigation) is normal; a hot phone that won't cool down may indicate a problem.
- If your iPhone gets too hot, it will throttle performance or shut down temporarily to protect the battery and internal components.
- Third-party thermometer apps that claim to measure room temperature are not accurate and should not be trusted for real measurements.
How to find your iPhone's internal temperature in Settings
Go to Settings > General > About. Scroll down and look for a field labeled Thermal State. This shows whether your device is running cool, warm, or hot — but it displays as a status word (like "Normal" or "Warm"), not a specific temperature number in degrees.
Apple does not expose the actual internal temperature in Celsius or Fahrenheit anywhere in the Settings app. The Thermal State field is the closest you can get to official temperature information without using developer tools.
If you want the actual internal temperature number, you would need to connect your iPhone to a Mac or PC running Xcode (Apple's developer software) and read the device logs. This is not practical for everyday use and requires technical knowledge.
When your iPhone gets warm during normal use
Your iPhone naturally heats up during demanding tasks. Gaming, video recording, navigation with GPS, or downloading large files all make the processor work harder, which generates heat. This is normal and expected — it does not mean something is wrong.
The phone will feel warm to the touch during these activities, especially if you're using it in direct sunlight or in a warm room. Once you stop the demanding task, the phone cools down within a few minutes as the processor returns to idle.
You can reduce heat during heavy use by closing background apps, lowering screen brightness, disabling location services temporarily, or taking a break. These steps are not necessary for safety — they just help the phone cool faster if you find it uncomfortable to hold.
Signs your iPhone is overheating and needs attention
An overheating iPhone will show a warning message on the lock screen or in Settings: "iPhone needs to cool down before you can use it." This happens when the internal temperature exceeds Apple's safety threshold, usually around 38°C (100°F) or higher.
When this warning appears, your iPhone will throttle performance (slow down the processor), disable the camera, reduce screen brightness, or shut down entirely until it cools. This is a protection mechanism — it prevents damage to the battery and internal circuits.
If your iPhone regularly overheats even during light use, or if it overheats in a cool environment, there may be a hardware problem. Possible causes include a failing battery, a malfunctioning processor, or damage to internal components. Contact Apple Support or visit an Apple Store for diagnosis.
Why third-party thermometer apps don't work
Apps in the App Store that claim to measure room temperature or outdoor temperature are not reading from a real sensor. They either display data from a weather API (a service that provides weather information from the internet), or they make up numbers based on nothing.
Because iPhones have no temperature sensor hardware, an app cannot measure the actual temperature of the air around you. Any app that shows a temperature reading is either pulling it from a weather service (which gives you the forecast for your location, not the real-time temperature where you are standing) or is simply not accurate.
If you need a real temperature reading, use a dedicated thermometer, a weather station, or check a weather website that reports conditions for your specific location.
What to do if your iPhone overheats
If your iPhone shows the overheating warning, stop using it immediately. Turn it off or put it in Airplane Mode, close all apps, and move it to a cool place — away from direct sunlight and away from heat sources. Do not put it in a freezer or refrigerator, as condensation can damage the internal components.
Let the phone sit for 15 to 30 minutes. Once it cools down, it will become usable again. If it overheats again during normal use, or if it overheats while powered off, the problem is likely hardware-related and you should contact Apple.
If overheating happens only during a specific app or activity, try uninstalling that app or avoiding that activity. If it happens across all apps, the issue is with the device itself, not the software.
Frequently Asked Questions
Can I see my iPhone's actual temperature in degrees?
Not through the standard Settings app. The Thermal State field in Settings > General > About only shows a status word like "Normal" or "Warm", not a number. Accessing the actual temperature requires connecting to a Mac or PC with Xcode, which is not practical for everyday use.
Is my iPhone overheating if it feels warm while I'm using it?
Not necessarily. Warmth during gaming, video, or navigation is normal. Overheating is only a problem if your iPhone shows the "needs to cool down" warning message, or if it gets hot even during light use or when idle. Normal warmth during heavy tasks does not indicate a problem.
What temperature is too hot for an iPhone?
Apple's official threshold is around 38°C (100°F) internally, at which point the device will show a warning and throttle performance. You don't need to monitor the exact number — if your phone shows the warning message, that's your signal to stop using it and let it cool.
Will a case make my iPhone overheat?
A case can trap some heat, but it won't cause overheating on its own. If your iPhone is overheating, removing the case may help it cool slightly faster, but the underlying cause is usually the processor working hard or a hardware problem, not the case.
Is it safe to use my iPhone while it's warm?
Yes, as long as it's not showing the overheating warning. Warmth during normal use is safe. The phone is designed to handle heat from regular tasks. Only stop using it if you see the warning message or if it's too hot to hold comfortably.