A Galaxy S25 is the smallest of the three S25 phones, with a 6.2-inch aluminum body that has less room to shed heat than the S25+ or the Ultra, so it warms faster under a sustained load. Warm during gaming, camera video or a first-day restore is normal. A phone that is hot with the screen off is not, and owners tied that to the July 2026 update. Note the Galaxy S25 FE is a different phone with an Exynos chip, so advice for the FE does not transfer to this one.
Differential
Likely causes of “Samsung Galaxy S25 gets hot or shows a temperature warning”, and how to tell them apart
- 1
Heavy load in a compact body
What separates it The phone warms after twenty minutes of gaming, 4K video or navigation, and the screen dims itself
How to confirm Check Settings, Battery, Battery usage for the app responsible, and stop it; the Snapdragon 8 Elite throttles by design when hot
- 2
Charging while in use
What separates it The back warms to the touch while charging and the phone is also streaming or gaming
How to confirm Unplug and use the phone for ten minutes, or charge it idle on a flat surface; wireless charging adds heat through the glass
- 3
A case that traps heat
What separates it Warmth builds in the area behind the camera plate and eases with the case off
How to confirm Take the case off for a charge and compare; thick or magnetic cases hold more heat on a 162 g phone
- 4
An update still working
What separates it The phone is warm and the battery bar falls for days after an update or restore
How to confirm Wait three days and restart; Samsung says maintenance tasks continue in the background after major updates
- 5
A bad app or a stuck job
What separates it Heat with the screen off, from one app that holds the CPU
How to confirm Safe mode for a day; if the heat stops, delete recent apps one at a time
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether it is hot while charging, in use, or sitting idle
- Ambient conditions: pocket, car dashboard, direct sun
- The top app in Settings, Battery, Battery usage
- One UI version and security patch date under Software information
Try in this order
0 of 6 completedStop and cool it
ReversibleClose the heavy app, take the case off and leave the phone in the shade. Do not use a fridge or freezer; sudden cold can leave condensation inside.
Find what is heating it
ReversibleSettings, Battery, Battery usage lists the apps by share. A game or camera at the top explains it; a social app with background use does not.
Charge cooler
ReversibleUse the Samsung 25 W charger or a PD 3.0 PPS charger, plug in idle, and avoid wireless charging while heavy tasks run.
Restart and update
ReversibleInstall any pending update under Software update and restart. After a major update Samsung says background maintenance can keep the phone warm for a few days.
Test in Safe mode
ReversibleHold the side key, then touch and hold Power off and tap Safe mode. If the heat vanishes, uninstall recent apps one at a time.
Reset only as a last step
Reset / data riskAfter a backup, Settings, General management, Reset, Reset all settings keeps data and clears settings drift; a factory reset is the final step before service.
Stop boundary
When this stops being a self-service repair
- !If the phone is hot with nothing running in Safe mode, book a service check
- !If the screen shows a temperature warning and shuts the camera off, let it cool, then check the case and charger
- !A swollen back, a smell or a case that no longer sits flat means stop using it and take it in
Evidence ledger
Sources behind this answer
Samsung's overheating guidance.
Reports of drain and heat after the July 2026 update and the suspected background job.
Per-model battery, charging, chip, display, glass and storage for the S25, S25+ and S25 Ultra.
Exact questions
Common questions
How hot is too hot for a Galaxy S25?+
Samsung says the phone may limit performance, brightness or charging to protect itself when it heats up. If the screen shows a high temperature message, stop using it until it cools.
Why does my S25 get warmer than an S25 Ultra?+
It is the smallest body in the line, 6.2 inches against 6.9, with a smaller heat spreader area, so the same load raises its temperature faster.
Is the Galaxy S25 FE the same phone?+
No. The S25 FE is a separate model with an Exynos chip and its own battery, so heat advice from FE owners does not map onto the S25.
Does 5G make the S25 hotter?+
Where signal is weak the radio works harder and the phone warms; switching to LTE under Mobile networks in a poor-signal area lowers the heat and the drain.