diff --git a/homeassistant/components/stookwijzer/diagnostics.py b/homeassistant/components/stookwijzer/diagnostics.py
index 2849e0e976a..1f3ef4ee4ba 100644
--- a/homeassistant/components/stookwijzer/diagnostics.py
+++ b/homeassistant/components/stookwijzer/diagnostics.py
@@ -18,4 +18,5 @@ async def async_get_config_entry_diagnostics(
         "advice": client.advice,
         "air_quality_index": client.lki,
         "windspeed_ms": client.windspeed_ms,
+        "forecast": await client.async_get_forecast(),
     }
diff --git a/homeassistant/components/stookwijzer/strings.json b/homeassistant/components/stookwijzer/strings.json
index d7304fa1238..a028f1f19c5 100644
--- a/homeassistant/components/stookwijzer/strings.json
+++ b/homeassistant/components/stookwijzer/strings.json
@@ -29,7 +29,7 @@
   },
   "issues": {
     "location_migration_failed": {
-      "description": "The Stookwijzer integration was unable to automatically migrate your location to a new format the updated integrations uses.\n\nMake sure you are connected to the internet and restart Home Assistant to try again.\n\nIf this doesn't resolve the error, remove and re-add the integration.",
+      "description": "The Stookwijzer integration was unable to automatically migrate your location to a new format the updated integration uses.\n\nMake sure you are connected to the Internet and restart Home Assistant to try again.\n\nIf this doesn't resolve the error, remove and re-add the integration.",
       "title": "Migration of your location failed"
     }
   },
diff --git a/tests/components/stookwijzer/conftest.py b/tests/components/stookwijzer/conftest.py
index 40582dc4be3..dd7f2a7bbc3 100644
--- a/tests/components/stookwijzer/conftest.py
+++ b/tests/components/stookwijzer/conftest.py
@@ -1,6 +1,7 @@
 """Fixtures for Stookwijzer integration tests."""
 
 from collections.abc import Generator
+from typing import Required, TypedDict
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
@@ -12,6 +13,14 @@ from homeassistant.core import HomeAssistant
 from tests.common import MockConfigEntry
 
 
+class Forecast(TypedDict):
+    """Typed Stookwijzer forecast dict."""
+
+    datetime: Required[str]
+    advice: str | None
+    final: bool | None
+
+
 @pytest.fixture
 def mock_config_entry() -> MockConfigEntry:
     """Return the default mocked config entry."""
@@ -80,6 +89,28 @@ def mock_stookwijzer() -> Generator[MagicMock]:
         client.windspeed_ms = 2.5
         client.windspeed_bft = 2
         client.advice = "code_yellow"
+        client.async_get_forecast.return_value = (
+            Forecast(
+                datetime="2025-02-12T17:00:00+01:00",
+                advice="code_yellow",
+                final=True,
+            ),
+            Forecast(
+                datetime="2025-02-12T23:00:00+01:00",
+                advice="code_yellow",
+                final=True,
+            ),
+            Forecast(
+                datetime="2025-02-13T05:00:00+01:00",
+                advice="code_orange",
+                final=False,
+            ),
+            Forecast(
+                datetime="2025-02-13T11:00:00+01:00",
+                advice="code_orange",
+                final=False,
+            ),
+        )
 
         yield stookwijzer_mock
 
diff --git a/tests/components/stookwijzer/snapshots/test_diagnostics.ambr b/tests/components/stookwijzer/snapshots/test_diagnostics.ambr
index e2535d54466..452b5bd0a30 100644
--- a/tests/components/stookwijzer/snapshots/test_diagnostics.ambr
+++ b/tests/components/stookwijzer/snapshots/test_diagnostics.ambr
@@ -3,6 +3,28 @@
   dict({
     'advice': 'code_yellow',
     'air_quality_index': 2,
+    'forecast': list([
+      dict({
+        'advice': 'code_yellow',
+        'datetime': '2025-02-12T17:00:00+01:00',
+        'final': True,
+      }),
+      dict({
+        'advice': 'code_yellow',
+        'datetime': '2025-02-12T23:00:00+01:00',
+        'final': True,
+      }),
+      dict({
+        'advice': 'code_orange',
+        'datetime': '2025-02-13T05:00:00+01:00',
+        'final': False,
+      }),
+      dict({
+        'advice': 'code_orange',
+        'datetime': '2025-02-13T11:00:00+01:00',
+        'final': False,
+      }),
+    ]),
     'windspeed_ms': 2.5,
   })
 # ---