Relative humidity

The Relative humidity condition passes when a humidity reading meets a threshold you define. You can check that humidity is above, below, or within a specific range. The condition works with humidity sensors, climate devices, humidifiers, and weather entities. Use it to run an automation only when the bedroom feels too damp, or only when the air is dry enough to need attention.

When you target more than one entity, the condition’s Condition passes if option controls how the check combines results. You can require any targeted entity to meet the threshold, or demand that all of them do.

Using this condition from the user interface

If you prefer building automations visually, Home Assistant walks you through this condition step by step. You pick what to check, tweak a few options, and save. No YAML knowledge required.

To use Relative humidity in an automation:

1. Go to Settings > Automations & scenes.
2. Open an existing automation, or select Create automation > Create new automation.
3. In the And if section, select Add condition.
4. Select what you want to check. Under By target (see Targets), pick the area your humidity sensor is in (like your bedroom or bathroom). You can also select a device, a specific entity, or a label.
5. From the conditions shown for that target, select Relative humidity.
6. Under Threshold type, set the humidity level the condition checks against:
   • Select Number to enter a fixed percentage directly, for example 65 for 65%.
   • Select Entity to use a helper or sensor as the threshold. When you pick an input_number or number helper, you can adjust the threshold without editing the automation. When you pick a humidity sensor, its current reading becomes the threshold and updates automatically as the sensor changes. This is useful for comparing two humidity readings, for example to check whether indoor humidity is higher than outdoor humidity. Then pick whether the reading must be above, below, or within a range of the threshold.
7. Under Condition passes if (see Behavior), pick Any or All.
8. Select Save.

Options in the UI

Using this condition in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, refer to this condition as humidity.is_value. A basic example looks like this:

condition: humidity.is_value
target:
  entity_id: sensor.bedroom_humidity
options:
  threshold:
    above: 60
  behavior: any

This passes when the bedroom humidity sensor reads above 60%.

To check that humidity stays below a certain level:

condition: humidity.is_value
target:
  entity_id: sensor.bedroom_humidity
options:
  threshold:
    below: 40
  behavior: any

This passes when the bedroom humidity sensor reads below 40%.

To check that humidity stays within a comfortable range:

condition: humidity.is_value
target:
  entity_id: sensor.bedroom_humidity
options:
  threshold:
    above: 40
    below: 60
  behavior: any

This passes when the bedroom humidity sensor reads between 40% and 60%.

Options in YAML

Targets of the condition

This condition requires a target. The target is the object that Home Assistant will check. You can point the condition at a single entityAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more], a device, an area, a floor, or a label, and Home Assistant will evaluate every matching humidity entity behind that target.

• Entity: one specific humidity entity, such as humidity.living_room.
• Device: every humidity entity that belongs to a device.
• Area: every humidity entity in a room or area.
• Floor: every humidity entity on a floor.
• Label: every humidity entity that shares a label.

You can also select different target types in one condition. For example, you can add a specific entity and an area as targets in the same condition to check both of them at once.

Behavior with multiple targets

When you target more than one entity (or select an area, floor, or label that contains several), the Condition passes if option controls how the results combine:

• Any (default): the condition passes if at least one of the targeted entities matches. For example, if you check three smoke sensors and only one of them detects smoke, the condition still passes. This is useful for questions like “is there smoke anywhere in the house?”
• All: the condition passes only when every targeted entity matches. For example, if you check the same three smoke sensors, the condition passes only once all three report cleared. This is useful for “is the entire house safe now?” checks, so your automation does not send an all-clear while one room still has a reading.

Good to know

• The condition works with humidity sensors, climate entities (using the current humidity reading), humidifier entities (using the current humidity reading), and weather entities.
• Entities that are unavailable (unavailable) or have an unknown state (unknown) are skipped for Any and fail for All.
• Humidity is expressed as a percentage. Indoor comfort is generally between 40% and 60%. Below 30% often feels dry and can irritate airways. Above 65% can encourage mold and dust mites.
• This condition checks the entity’s current humidity reading, not its target setpoint. To check a humidifier’s target setpoint instead, use the Humidifier target humidity condition.
• When you use a sensor as a dynamic threshold, its value is read at the moment the condition runs. The threshold is not continuously tracked; it is re-evaluated each time the automation fires.

Try it yourself

Ready to test this? Go to Settings > Automations & scenes, open an automation, and add this condition. Trigger the automation with and without the condition met, and watch whether it continues or stops.

More examples

Real scenarios where this condition gates an automation. Copy any example and adapt it to your setup.

Automation: run a dehumidifier when the room gets too damp

When the bedroom humidity sensor reads above 65%, turn on the dehumidifier to bring levels back to a comfortable range. The condition prevents the dehumidifier from running when the air is already dry enough.

• Trigger: Time pattern: Every 15 minutes
• Condition: Relative humidity (above 65%)
• Target: Bedroom humidity sensor
• Condition passes if: Any
• Action: Switch: Turn on

alias: "Run dehumidifier when bedroom is too damp"
triggers:
  - trigger: time_pattern
    minutes: "/15"
conditions:
  - condition: humidity.is_value
    target:
      entity_id: sensor.bedroom_humidity
    options:
      threshold:
        above: 65
      behavior: any
actions:
  - action: switch.turn_on
    target:
      entity_id: switch.bedroom_dehumidifier

Automation: send an alert when the air gets too dry

At midnight, check the living room humidity. If it has dropped below 30%, send a notification so you can switch on a humidifier before you go to sleep.

• Trigger: Time: 00:00
• Condition: Relative humidity (below 30%)
• Target: Living room humidity sensor
• Condition passes if: Any
• Action: Notify mobile app

alias: "Alert when living room air is too dry"
triggers:
  - trigger: time
    at: "00:00:00"
conditions:
  - condition: humidity.is_value
    target:
      entity_id: sensor.living_room_humidity
    options:
      threshold:
        below: 30
      behavior: any
actions:
  - action: notify.mobile_app_phone
    data:
      message: >
        The living room humidity is below 30%.
        Consider switching on the humidifier.

Automation: run the ventilation fan when indoor humidity exceeds outdoor humidity

Every 15 minutes, check whether the living room is more humid than the outside air. If so, open the ventilation to let drier air in. The outdoor humidity sensor acts as a live threshold, so the condition always compares the two current readings.

• Trigger: Time pattern: Every 15 minutes
• Condition: Relative humidity (above, entity: outdoor humidity sensor)
• Target: Living room humidity sensor
• Condition passes if: Any
• Action: Switch: Turn on ventilation fan

alias: "Ventilate when indoor humidity exceeds outdoor"
triggers:
  - trigger: time_pattern
    minutes: "/15"
conditions:
  - condition: humidity.is_value
    target:
      entity_id: sensor.living_room_humidity
    options:
      threshold:
        above: sensor.outdoor_humidity
      behavior: any
actions:
  - action: switch.turn_on
    target:
      entity_id: switch.ventilation_fan

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the condition you’re using and what you expected to happen, or share on our subreddit /r/homeassistant.