diff --git a/homeassistant/components/modbus/__init__.py b/homeassistant/components/modbus/__init__.py
index 830dadfcdb8..b7a1e9db8e7 100644
--- a/homeassistant/components/modbus/__init__.py
+++ b/homeassistant/components/modbus/__init__.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import cast
 
 import voluptuous as vol
 
@@ -46,6 +47,7 @@ from homeassistant.const import (
 )
 from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.typing import ConfigType
 
 from .const import (
     ATTR_ADDRESS,
@@ -378,10 +380,10 @@ SERVICE_STOP_START_SCHEMA = vol.Schema(
 
 def get_hub(hass: HomeAssistant, name: str) -> ModbusHub:
     """Return modbus hub with name."""
-    return hass.data[DOMAIN][name]
+    return cast(ModbusHub, hass.data[DOMAIN][name])
 
 
-async def async_setup(hass, config):
+async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Set up Modbus component."""
     return await async_modbus_setup(
         hass,
diff --git a/homeassistant/components/modbus/validators.py b/homeassistant/components/modbus/validators.py
index df4fe3c1e62..3d13178bccc 100644
--- a/homeassistant/components/modbus/validators.py
+++ b/homeassistant/components/modbus/validators.py
@@ -84,7 +84,7 @@ DEFAULT_STRUCT_FORMAT = {
 }
 
 
-def struct_validator(config):
+def struct_validator(config: dict[str, Any]) -> dict[str, Any]:
     """Sensor schema validator."""
 
     data_type = config[CONF_DATA_TYPE]
@@ -154,13 +154,11 @@ def number_validator(value: Any) -> int | float:
         return value
 
     try:
-        value = int(value)
-        return value
+        return int(value)
     except (TypeError, ValueError):
         pass
     try:
-        value = float(value)
-        return value
+        return float(value)
     except (TypeError, ValueError) as err:
         raise vol.Invalid(f"invalid number {value}") from err