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What Is the Right Temperature and Air Humidity in a Bathroom?

The right temperature and ventilation in the bathroom will keep the structures dry and bathroom dries fast after usege.

Optimal temperature in the bathroom ensures pleasant usage, but plays an even more important role for the drying of bathroom structures and fittings. Suitable temperature in a bathroom is usually around 23-24 °C.

Bathroom floor heating and recommended temperature

Underfloor heating is sufficient in the bathroom when the floor feels neutral against your foot. The floor is not meant to feel warm or hot, but the surface temperature should be between 23° C and 24° C.

Underfloor heating is often one of the biggest contributors to high electricity bills. It is worth keeping the bathroom door shut to save money, so that the heat does not escape to the rest of the home.

Bathroom air humidity

Relative humidity can temporarily rise to 100% in the bathroom, so ventilation needs to work well to cope with such humidity. If humidity stays up for a longer period of time, moisture can condense in cold corners of the room and cause unfortunate moisture damage. Suitable humidity in the bathroom should be around 30% to 60%. You will know that ventilation in your bathroom is insufficient if moisture condenses on bathroom surfaces for several minutes.

Bathroom air humidity and temperature measurement

A proper device for measuring humidity in the bathroom is RuuviTag or RuuviTag Pro (3in1). Both of these sensors measure humidity and temperature. Install the sensor at the height of your head. We suggest that the device is installed far enough from the shower, as the breathable membrane may absorb water if the droplets remain on its surface for too long.

Once the sensor is installed, you can monitor real time temperature and humidity levels from the Ruuvi Station app. You can also observe the history graphs to see whether it is excessively humid in your bathroom for longer periods of time. You can also place Ruuvitag to bathroom floor and you can easily monitor floor heating cycles and adjust thermostat if necessary. If necessary, you can set alarms from the application that will alert you about undesirable conditions.

Buy Combined Thermometer And Hygrometer to Bathroom
Ensure your bathroom is in good condition with RuuviTag

Buy Combined Thermometer And Hygrometer to Bathroom

Ensure your bathroom is in good condition with RuuviTag


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RuuviTag is a Bluetooth sensor that monitors environmental conditions and sends the data directly to your mobile device. The Ruuvi Station mobile app allows you to view real-time accurate measurements and historical graphs. The app also provides customisable alerts to notify you of critical conditions, such as a melting freezer, excessively high bedroom temperatures that could disrupt sleep, or elevated humidity levels in your basement.

Onboard Sensors (4-in-1)

Temperature: °C, °F, K; typical accuracy ±0,2 °C @ 5-60 °C (±0.36 °F @ 41-140 °F).
Air humidity: RH-%, g/m3, dew point; typical accuracy ±3 RH-% @ 20…80 %. Range: 0-95 %.
Air pressure: Pa, hPa, mmHg, inHg; typical accuracy ±1 hPa. Range: 500-1155 hPa.
Motion: Movement counter. Counter is incremented when acceleration exceeds the threshold on any axis.

Operational Conditions

Operating temperature (with stock battery): -20 °C to +70 °C (-4 °F to 158 °F).
Absolute maximum operating temperature: -40 °C to +85 °C (-40 °F to +185 °F).
Housing: IP67, splash-proof, non-condensing location.
Battery: User-replaceable CR2477 (included). Supports extended operating temperature range battery CR2477T.
Battery lifespan: Estimated 12 to 24 months.
Bluetooth range: 5-20 meters (indoor), 20-100 meters (outdoor). The sensitivity of the receiving mobile device’s antenna, obstacles and wall materials affect the range. For increased range, use the Ruuvi Gateway router as a receiver.

App Features

Free and easy: User-friendly free app, signing in is optional.
Android and iOS.
Alerts: Configurable Bluetooth push alerts with customisable messages.
Real-time measurements: Track data in real time.
Historical data: Detailed historical graphs available for up to 10 days (offline).
History export: 10-day history export.
Dashboard: See all your sensors at a glance.
Personalise sensors: Use custom backgrounds and names.
Multilingual: Available in English, Finnish, Swedish, French, and German.


Integrations: Victron Energy, Home Assistant, Homey, and more.
Remote monitoring: When not within Bluetooth range, online remote monitoring is available with the Ruuvi Gateway and Ruuvi Cloud, both sold separately.

Technical Specifications

Data sheet: Download (pdf)
Read more info below:

You will find more use cases below