diff --git a/homeassistant/components/smartthings/climate.py b/homeassistant/components/smartthings/climate.py
index 56a5494eeaa..edc0688b5f7 100644
--- a/homeassistant/components/smartthings/climate.py
+++ b/homeassistant/components/smartthings/climate.py
@@ -100,7 +100,7 @@ async def async_setup_entry(
     ]
 
     broker = hass.data[DOMAIN][DATA_BROKERS][config_entry.entry_id]
-    entities = []
+    entities: list[ClimateEntity] = []
     for device in broker.devices.values():
         if not broker.any_assigned(device.device_id, CLIMATE_DOMAIN):
             continue
diff --git a/homeassistant/components/smartthings/fan.py b/homeassistant/components/smartthings/fan.py
index 62850d5b002..81171ecf554 100644
--- a/homeassistant/components/smartthings/fan.py
+++ b/homeassistant/components/smartthings/fan.py
@@ -44,12 +44,13 @@ def get_capabilities(capabilities: Sequence[str]) -> Sequence[str] | None:
     # Must have switch and fan_speed
     if all(capability in capabilities for capability in supported):
         return supported
+    return None
 
 
 class SmartThingsFan(SmartThingsEntity, FanEntity):
     """Define a SmartThings Fan."""
 
-    async def async_set_percentage(self, percentage: int) -> None:
+    async def async_set_percentage(self, percentage: int | None) -> None:
         """Set the speed percentage of the fan."""
         if percentage is None:
             await self._device.switch_on(set_status=True)
@@ -64,9 +65,9 @@ class SmartThingsFan(SmartThingsEntity, FanEntity):
 
     async def async_turn_on(
         self,
-        speed: str = None,
-        percentage: int = None,
-        preset_mode: str = None,
+        speed: str | None = None,
+        percentage: int | None = None,
+        preset_mode: str | None = None,
         **kwargs,
     ) -> None:
         """Turn the fan on."""
diff --git a/homeassistant/components/smartthings/light.py b/homeassistant/components/smartthings/light.py
index be3315594a8..794a902e941 100644
--- a/homeassistant/components/smartthings/light.py
+++ b/homeassistant/components/smartthings/light.py
@@ -162,7 +162,7 @@ class SmartThingsLight(SmartThingsEntity, LightEntity):
     async def async_set_color_temp(self, value: float):
         """Set the color temperature of the device."""
         kelvin = color_util.color_temperature_mired_to_kelvin(value)
-        kelvin = max(min(kelvin, 30000.0), 1.0)
+        kelvin = max(min(kelvin, 30000), 1)
         await self._device.set_color_temperature(kelvin, set_status=True)
 
     async def async_set_level(self, brightness: int, transition: int):
diff --git a/homeassistant/components/smartthings/sensor.py b/homeassistant/components/smartthings/sensor.py
index 6a4c6ba7586..bd591625c18 100644
--- a/homeassistant/components/smartthings/sensor.py
+++ b/homeassistant/components/smartthings/sensor.py
@@ -35,10 +35,10 @@ from . import SmartThingsEntity
 from .const import DATA_BROKERS, DOMAIN
 
 Map = namedtuple(
-    "map", "attribute name default_unit device_class state_class entity_category"
+    "Map", "attribute name default_unit device_class state_class entity_category"
 )
 
-CAPABILITY_TO_SENSORS = {
+CAPABILITY_TO_SENSORS: dict[str, list[Map]] = {
     Capability.activity_lighting_mode: [
         Map(
             Attribute.lighting_mode,
@@ -555,18 +555,18 @@ async def async_setup_entry(
 ) -> None:
     """Add binary sensors for a config entry."""
     broker = hass.data[DOMAIN][DATA_BROKERS][config_entry.entry_id]
-    sensors = []
+    entities: list[SensorEntity] = []
     for device in broker.devices.values():
         for capability in broker.get_assigned(device.device_id, "sensor"):
             if capability == Capability.three_axis:
-                sensors.extend(
+                entities.extend(
                     [
                         SmartThingsThreeAxisSensor(device, index)
                         for index in range(len(THREE_AXIS_NAMES))
                     ]
                 )
             elif capability == Capability.power_consumption_report:
-                sensors.extend(
+                entities.extend(
                     [
                         SmartThingsPowerConsumptionSensor(device, report_name)
                         for report_name in POWER_CONSUMPTION_REPORT_NAMES
@@ -574,7 +574,7 @@ async def async_setup_entry(
                 )
             else:
                 maps = CAPABILITY_TO_SENSORS[capability]
-                sensors.extend(
+                entities.extend(
                     [
                         SmartThingsSensor(
                             device,
@@ -592,7 +592,7 @@ async def async_setup_entry(
         if broker.any_assigned(device.device_id, "switch"):
             for capability in (Capability.energy_meter, Capability.power_meter):
                 maps = CAPABILITY_TO_SENSORS[capability]
-                sensors.extend(
+                entities.extend(
                     [
                         SmartThingsSensor(
                             device,
@@ -607,7 +607,7 @@ async def async_setup_entry(
                     ]
                 )
 
-    async_add_entities(sensors)
+    async_add_entities(entities)
 
 
 def get_capabilities(capabilities: Sequence[str]) -> Sequence[str] | None:
diff --git a/mypy.ini b/mypy.ini
index 581ff48e6ba..4349373afca 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2167,9 +2167,6 @@ ignore_errors = true
 [mypy-homeassistant.components.ring.*]
 ignore_errors = true
 
-[mypy-homeassistant.components.smartthings.*]
-ignore_errors = true
-
 [mypy-homeassistant.components.solaredge.*]
 ignore_errors = true
 
diff --git a/script/hassfest/mypy_config.py b/script/hassfest/mypy_config.py
index cc11d0f97e5..9a965ae63cd 100644
--- a/script/hassfest/mypy_config.py
+++ b/script/hassfest/mypy_config.py
@@ -64,7 +64,6 @@ IGNORED_MODULES: Final[list[str]] = [
     "homeassistant.components.plugwise.*",
     "homeassistant.components.profiler.*",
     "homeassistant.components.ring.*",
-    "homeassistant.components.smartthings.*",
     "homeassistant.components.solaredge.*",
     "homeassistant.components.sonos.*",
     "homeassistant.components.spotify.*",