Apple has issued an urgent warning to iPhone users as the UK swelters in a heatwave with temperatures reaching 36°C. The company cautions that high heat can trigger built-in safeguards to protect internal components, potentially causing permanent damage if ignored.
How Heat Affects Your iPhone
According to Apple, iPhones are designed to operate in ambient temperatures between 0°C and 35°C. When temperatures exceed this range, the device may alter its behaviour to regulate internal temperature and prevent permanent damage to electronics and the battery. Apple states: "Using an iOS device in very hot conditions can permanently shorten battery life."
Users may experience a permanently dimmed screen, slower performance, disabled camera flash, and the message "Charging on hold" until the iPhone returns to normal temperature. In severe cases, a "Temperature: iPhone needs to cool down" alert may appear, shutting off the screen during navigation—though audible turn-by-turn directions continue.
Immediate Steps to Cool Down Your iPhone
If the temperature warning appears, Apple recommends: "To resume use of your device as quickly as possible, turn it off, move it to a cooler environment, and allow it to cool down." Additional steps include:
- Stop using the phone and close all open applications
- Remove any heavy or thick protective cases to allow heat to dissipate
- Move the device out of direct sunlight or a hot car
- Power down the phone entirely to stop internal heat generation
Critical Warning: Never Refrigerate Your iPhone
Apple explicitly warns against placing an overheated iPhone in a refrigerator or freezer. Sudden temperature changes and condensation can cause irreversible water and component damage, potentially destroying the device.
With UK temperatures reaching record highs, even indoor use can pose risks. Users are advised to keep iPhones in shaded, cool areas and avoid leaving them in parked cars or direct sunlight.
