Mac temperature monitoring from the command line

Apple stopped shipping the easy istats-style tools years ago, and on Apple Silicon they tightened down access to thermal sensors. The good news: you can still get real temperature data without installing anything, you just need the right command and a moment of patience.

The built-in tool: powermetrics

powermetrics is Apple’s official sampler for power, frequency, and (where exposed) thermals.

1. Open Terminal.
2. Run sudo powermetrics --samplers smc -i 1000 -n 5 to take five samples a second apart.
3. Look for CPU die temperature and GPU die temperature in the output.
4. Use sudo powermetrics -i 1000 with no -n for a continuous stream; Ctrl-C to stop.

On Apple Silicon the SMC sampler reports die temps and fan RPM. On Intel Macs you also get per-core thermals. Important caveat: powermetrics itself uses a little CPU and warms the chip slightly, so very short samples can read marginally higher than steady state.

Other samplers worth knowing

• —samplers cpu_power — CPU frequencies and per-package power.
• —samplers gpu_power — GPU active residency and power.
• —samplers thermal — thermal pressure (nominal / moderate / heavy / trapping / sleeping).

The thermal pressure sampler is what you want for “is macOS about to throttle me.” It’s a five-level state, easier to read than a raw temperature number.

sysctl thermal_state

For a one-liner that maps to the same thermal pressure level:

pmset -g therm

Returns “CPU_Speed_Limit” (100 means no throttling, less means active thermal capping) and CPU_Available_CPUs.

When you want it ambient

CLI is great for one-off checks. For “let me see the temperature out of the corner of my eye while I work,” a menubar readout is the right approach.

1. Install Beacon.
2. Enable Temperature in Settings > Menu Bar.
3. Choose CPU die, average of all sensors, or hottest sensor.
4. Click the readout for fan RPM and a recent temperature graph.

The menubar approach uses the same underlying SMC reads as powermetrics, just polled at a lower rate.

What numbers to expect

Rough ballparks on Apple Silicon during typical use:

• Idle — 35-45°C.
• Light load (browsing, mail) — 45-55°C.
• Sustained CPU/GPU load — 70-90°C is normal; thermals start to govern frequency.
• Thermal pressure “heavy” — 95°C+, you’ll feel throttling.

Apple Silicon thermals run hotter than Intel-era expectations because the chips are designed to operate that way. 85°C during a build isn’t an emergency; it’s the design point.