diff --git a/homeassistant/components/smhi/__init__.py b/homeassistant/components/smhi/__init__.py
index e3f55904b77674a9e99ce0beee939589f4876ed4..98c8de870322ab268e47645aead992192219bc3f 100644
--- a/homeassistant/components/smhi/__init__.py
+++ b/homeassistant/components/smhi/__init__.py
@@ -7,8 +7,7 @@ from homeassistant.const import (
     CONF_NAME,
     Platform,
 )
-from homeassistant.core import HomeAssistant, callback
-from homeassistant.helpers.entity_registry import RegistryEntry, async_migrate_entries
+from homeassistant.core import HomeAssistant
 
 PLATFORMS = [Platform.WEATHER]
 
@@ -40,21 +39,10 @@ async def async_migrate_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
                 CONF_LONGITUDE: entry.data[CONF_LONGITUDE],
             },
         }
-        new_unique_id = f"smhi-{entry.data[CONF_LATITUDE]}-{entry.data[CONF_LONGITUDE]}"
 
-        if not hass.config_entries.async_update_entry(
-            entry, data=new_data, unique_id=new_unique_id
-        ):
+        if not hass.config_entries.async_update_entry(entry, data=new_data):
             return False
 
         entry.version = 2
-        new_unique_id_entity = f"smhi-{entry.data[CONF_LOCATION][CONF_LATITUDE]}-{entry.data[CONF_LOCATION][CONF_LONGITUDE]}"
-
-        @callback
-        def update_unique_id(entity_entry: RegistryEntry) -> dict[str, str]:
-            """Update unique ID of entity entry."""
-            return {"new_unique_id": new_unique_id_entity}
-
-        await async_migrate_entries(hass, entry.entry_id, update_unique_id)
 
     return True
diff --git a/homeassistant/components/smhi/config_flow.py b/homeassistant/components/smhi/config_flow.py
index 8d338e3eb3e16fb2b86b729f56acd89769d91cb4..bfa38f317a95b213e10d4aaf8182421213614cce 100644
--- a/homeassistant/components/smhi/config_flow.py
+++ b/homeassistant/components/smhi/config_flow.py
@@ -57,7 +57,7 @@ class SmhiFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
                     HOME_LOCATION_NAME if name == HOME_LOCATION_NAME else DEFAULT_NAME
                 )
 
-                await self.async_set_unique_id(f"smhi-{lat}-{lon}")
+                await self.async_set_unique_id(f"{lat}-{lon}")
                 self._abort_if_unique_id_configured()
                 return self.async_create_entry(title=name, data=user_input)
 
diff --git a/homeassistant/components/smhi/weather.py b/homeassistant/components/smhi/weather.py
index 5d1f3e3c87ee0fef6a57e4666e4ba9f53a6ab446..d7df54957c063b936b26d587428b2814a7448d7f 100644
--- a/homeassistant/components/smhi/weather.py
+++ b/homeassistant/components/smhi/weather.py
@@ -136,7 +136,7 @@ class SmhiWeather(WeatherEntity):
         """Initialize the SMHI weather entity."""
 
         self._attr_name = name
-        self._attr_unique_id = f"smhi-{latitude}-{longitude}"
+        self._attr_unique_id = f"{latitude}, {longitude}"
         self._forecasts: list[SmhiForecast] | None = None
         self._fail_count = 0
         self._smhi_api = Smhi(longitude, latitude, session=session)
diff --git a/tests/components/smhi/test_config_flow.py b/tests/components/smhi/test_config_flow.py
index ab3e36f81de14153eaa1b7436fa40a774b2670d0..f33849694c8fc7a0a72ae28a25795d96aaf5033a 100644
--- a/tests/components/smhi/test_config_flow.py
+++ b/tests/components/smhi/test_config_flow.py
@@ -9,11 +9,7 @@ from homeassistant import config_entries
 from homeassistant.components.smhi.const import DOMAIN
 from homeassistant.const import CONF_LATITUDE, CONF_LOCATION, CONF_LONGITUDE
 from homeassistant.core import HomeAssistant
-from homeassistant.data_entry_flow import (
-    RESULT_TYPE_ABORT,
-    RESULT_TYPE_CREATE_ENTRY,
-    RESULT_TYPE_FORM,
-)
+from homeassistant.data_entry_flow import FlowResultType
 
 from tests.common import MockConfigEntry
 
@@ -27,7 +23,7 @@ async def test_form(hass: HomeAssistant) -> None:
     result = await hass.config_entries.flow.async_init(
         DOMAIN, context={"source": config_entries.SOURCE_USER}
     )
-    assert result["type"] == RESULT_TYPE_FORM
+    assert result["type"] == FlowResultType.FORM
     assert result["errors"] == {}
 
     with patch(
@@ -48,7 +44,7 @@ async def test_form(hass: HomeAssistant) -> None:
         )
         await hass.async_block_till_done()
 
-    assert result2["type"] == RESULT_TYPE_CREATE_ENTRY
+    assert result2["type"] == FlowResultType.CREATE_ENTRY
     assert result2["title"] == "Home"
     assert result2["data"] == {
         "location": {
@@ -81,7 +77,7 @@ async def test_form(hass: HomeAssistant) -> None:
         )
         await hass.async_block_till_done()
 
-    assert result4["type"] == RESULT_TYPE_CREATE_ENTRY
+    assert result4["type"] == FlowResultType.CREATE_ENTRY
     assert result4["title"] == "Weather 1.0 1.0"
     assert result4["data"] == {
         "location": {
@@ -113,7 +109,7 @@ async def test_form_invalid_coordinates(hass: HomeAssistant) -> None:
         )
         await hass.async_block_till_done()
 
-    assert result2["type"] == RESULT_TYPE_FORM
+    assert result2["type"] == FlowResultType.FORM
     assert result2["errors"] == {"base": "wrong_location"}
 
     # Continue flow with new coordinates
@@ -135,7 +131,7 @@ async def test_form_invalid_coordinates(hass: HomeAssistant) -> None:
         )
         await hass.async_block_till_done()
 
-    assert result3["type"] == RESULT_TYPE_CREATE_ENTRY
+    assert result3["type"] == FlowResultType.CREATE_ENTRY
     assert result3["title"] == "Weather 2.0 2.0"
     assert result3["data"] == {
         "location": {
@@ -150,7 +146,7 @@ async def test_form_unique_id_exist(hass: HomeAssistant) -> None:
     """Test we handle unique id already exist."""
     entry = MockConfigEntry(
         domain=DOMAIN,
-        unique_id="smhi-1.0-1.0",
+        unique_id="1.0-1.0",
         data={
             "location": {
                 "latitude": 1.0,
@@ -179,5 +175,5 @@ async def test_form_unique_id_exist(hass: HomeAssistant) -> None:
         )
         await hass.async_block_till_done()
 
-    assert result2["type"] == RESULT_TYPE_ABORT
+    assert result2["type"] == FlowResultType.ABORT
     assert result2["reason"] == "already_configured"
diff --git a/tests/components/smhi/test_init.py b/tests/components/smhi/test_init.py
index ea6d55fabf6337d19a4d737d9b2014c50d5fe8ca..ec6e4c417bb719b3f476c0659367f52316764c7d 100644
--- a/tests/components/smhi/test_init.py
+++ b/tests/components/smhi/test_init.py
@@ -1,4 +1,6 @@
 """Test SMHI component setup process."""
+from unittest.mock import patch
+
 from smhi.smhi_lib import APIURL_TEMPLATE
 
 from homeassistant.components.smhi.const import DOMAIN
@@ -56,7 +58,7 @@ async def test_remove_entry(
 async def test_migrate_entry(
     hass: HomeAssistant, aioclient_mock: AiohttpClientMocker, api_response: str
 ) -> None:
-    """Test migrate entry and entities unique id."""
+    """Test migrate entry data."""
     uri = APIURL_TEMPLATE.format(
         TEST_CONFIG_MIGRATE["longitude"], TEST_CONFIG_MIGRATE["latitude"]
     )
@@ -82,7 +84,29 @@ async def test_migrate_entry(
     assert state
 
     assert entry.version == 2
-    assert entry.unique_id == "smhi-17.84197-17.84197"
+    assert entry.unique_id == "17.84197-17.84197"
 
     entity_get = entity_reg.async_get(entity.entity_id)
-    assert entity_get.unique_id == "smhi-17.84197-17.84197"
+    assert entity_get.unique_id == "17.84197, 17.84197"
+
+
+async def test_migrate_entry_failed(
+    hass: HomeAssistant, aioclient_mock: AiohttpClientMocker, api_response: str
+) -> None:
+    """Test migrate entry data that fails."""
+    uri = APIURL_TEMPLATE.format(
+        TEST_CONFIG_MIGRATE["longitude"], TEST_CONFIG_MIGRATE["latitude"]
+    )
+    aioclient_mock.get(uri, text=api_response)
+    entry = MockConfigEntry(domain=DOMAIN, data=TEST_CONFIG_MIGRATE)
+    entry.add_to_hass(hass)
+    assert entry.version == 1
+
+    with patch(
+        "homeassistant.config_entries.ConfigEntries.async_update_entry",
+        return_value=False,
+    ):
+        await hass.config_entries.async_setup(entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert entry.version == 1