Why your baby monitor's temperature reading can be wrong

By Stellar Baby Updated 7 July 2026 1 min read

Your monitor says 21 degrees. But is that the temperature your babe is actually feeling? Often, not quite, and it's got nothing to do with the sensor being faulty.

Where your monitor measures

Most baby monitors read the temperature wherever the camera is mounted, which is usually up high on a wall or shelf. That's rarely where your babe sleeps.

Heat rises: the cot-level difference

Warm air rises. So the air near the ceiling or up on a shelf can sit a degree or two warmer than the air down at cot level. The reading isn't wrong, it's just not the reading that matters for your babe.

Sensor heat from the camera itself

Electronics give off heat. A temperature sensor sitting inside a camera can be nudged by the warmth of the device around it, which is another reason the number can drift from reality.

How to get a reading that reflects your babe

Measure low, near the cot, with something that sits where your babe sleeps. Orbie is an environment monitor built to do exactly that, it reads at cot level and moves with your babe so the number reflects their actual environment. It works alongside your baby monitor, not instead of it.

We get asked about accuracy a lot. The full answer, along with how the sensor avoids warming itself, is in the Orbie FAQs.

This article is general information, not medical advice. If you're ever worried about your little babe, trust your gut and reach out to your GP, child health nurse, or Pregnancy, Birth and Baby on 1800 882 436.

Sources

A sensor mounted up on a camera reads the air up there, not the air where your babe sleeps.

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Common questions

Are baby monitor temperature sensors accurate?

Two things can throw them off. One is placement: a camera mounted up high reads the warmer air up there, not the air at your babe's level. The other is the monitor's own heat, as the sensor sits inside the device and can be warmed by its electronics. The sensor itself may be fine; it's these two that shift the number.

Where's the best place to measure nursery temperature?

As close to where your babe sleeps as possible. Heat rises, so a reading at your babe's level better reflects the air they're actually in.

Why does my monitor read differently to a thermometer?

Usually placement, and sometimes the monitor's own heat. Two devices in different spots and at different heights read differently anyway, and a sensor built into a camera can be warmed by the device around it.