diff --git a/homeassistant/components/synology_dsm/const.py b/homeassistant/components/synology_dsm/const.py
index 1c1f94c5d60..1fc6ba6e09b 100644
--- a/homeassistant/components/synology_dsm/const.py
+++ b/homeassistant/components/synology_dsm/const.py
@@ -26,6 +26,7 @@ from homeassistant.const import (
     DEVICE_CLASS_TEMPERATURE,
     DEVICE_CLASS_TIMESTAMP,
     PERCENTAGE,
+    TEMP_CELSIUS,
 )
 
 
@@ -287,7 +288,7 @@ STORAGE_VOL_SENSORS: dict[str, EntityInfo] = {
     },
     f"{SynoStorage.API_KEY}:volume_disk_temp_avg": {
         ATTR_NAME: "Average Disk Temp",
-        ATTR_UNIT_OF_MEASUREMENT: None,
+        ATTR_UNIT_OF_MEASUREMENT: TEMP_CELSIUS,
         ATTR_ICON: None,
         ATTR_DEVICE_CLASS: DEVICE_CLASS_TEMPERATURE,
         ENTITY_ENABLE: True,
@@ -295,7 +296,7 @@ STORAGE_VOL_SENSORS: dict[str, EntityInfo] = {
     },
     f"{SynoStorage.API_KEY}:volume_disk_temp_max": {
         ATTR_NAME: "Maximum Disk Temp",
-        ATTR_UNIT_OF_MEASUREMENT: None,
+        ATTR_UNIT_OF_MEASUREMENT: TEMP_CELSIUS,
         ATTR_ICON: None,
         ATTR_DEVICE_CLASS: DEVICE_CLASS_TEMPERATURE,
         ENTITY_ENABLE: False,
@@ -321,7 +322,7 @@ STORAGE_DISK_SENSORS: dict[str, EntityInfo] = {
     },
     f"{SynoStorage.API_KEY}:disk_temp": {
         ATTR_NAME: "Temperature",
-        ATTR_UNIT_OF_MEASUREMENT: None,
+        ATTR_UNIT_OF_MEASUREMENT: TEMP_CELSIUS,
         ATTR_ICON: None,
         ATTR_DEVICE_CLASS: DEVICE_CLASS_TEMPERATURE,
         ENTITY_ENABLE: True,
@@ -332,7 +333,7 @@ STORAGE_DISK_SENSORS: dict[str, EntityInfo] = {
 INFORMATION_SENSORS: dict[str, EntityInfo] = {
     f"{SynoDSMInformation.API_KEY}:temperature": {
         ATTR_NAME: "temperature",
-        ATTR_UNIT_OF_MEASUREMENT: None,
+        ATTR_UNIT_OF_MEASUREMENT: TEMP_CELSIUS,
         ATTR_ICON: None,
         ATTR_DEVICE_CLASS: DEVICE_CLASS_TEMPERATURE,
         ENTITY_ENABLE: True,
@@ -359,11 +360,3 @@ SURVEILLANCE_SWITCH: dict[str, EntityInfo] = {
         ATTR_STATE_CLASS: None,
     },
 }
-
-
-TEMP_SENSORS_KEYS = [
-    "volume_disk_temp_avg",
-    "volume_disk_temp_max",
-    "disk_temp",
-    "temperature",
-]
diff --git a/homeassistant/components/synology_dsm/sensor.py b/homeassistant/components/synology_dsm/sensor.py
index 1ddc79c0afc..72ddb944b11 100644
--- a/homeassistant/components/synology_dsm/sensor.py
+++ b/homeassistant/components/synology_dsm/sensor.py
@@ -11,12 +11,9 @@ from homeassistant.const import (
     DATA_MEGABYTES,
     DATA_RATE_KILOBYTES_PER_SECOND,
     DATA_TERABYTES,
-    PRECISION_TENTHS,
-    TEMP_CELSIUS,
 )
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.temperature import display_temp
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 from homeassistant.util.dt import utcnow
 
@@ -30,7 +27,6 @@ from .const import (
     STORAGE_DISK_SENSORS,
     STORAGE_VOL_SENSORS,
     SYNO_API,
-    TEMP_SENSORS_KEYS,
     UTILISATION_SENSORS,
     EntityInfo,
 )
@@ -92,8 +88,6 @@ class SynoDSMSensor(SynologyDSMBaseEntity):
     @property
     def native_unit_of_measurement(self) -> str | None:
         """Return the unit the value is expressed in."""
-        if self.entity_type in TEMP_SENSORS_KEYS:
-            return self.hass.config.units.temperature_unit
         return self._unit
 
 
@@ -143,10 +137,6 @@ class SynoDSMStorageSensor(SynologyDSMDeviceEntity, SynoDSMSensor, SensorEntity)
         if self._unit == DATA_TERABYTES:
             return round(attr / 1024.0 ** 4, 2)
 
-        # Temperature
-        if self.entity_type in TEMP_SENSORS_KEYS:
-            return display_temp(self.hass, attr, TEMP_CELSIUS, PRECISION_TENTHS)
-
         return attr
 
 
@@ -172,10 +162,6 @@ class SynoDSMInfoSensor(SynoDSMSensor, SensorEntity):
         if attr is None:
             return None
 
-        # Temperature
-        if self.entity_type in TEMP_SENSORS_KEYS:
-            return display_temp(self.hass, attr, TEMP_CELSIUS, PRECISION_TENTHS)
-
         if self.entity_type == "uptime":
             # reboot happened or entity creation
             if self._previous_uptime is None or self._previous_uptime > attr: