diff --git a/homeassistant/components/open_meteo/diagnostics.py b/homeassistant/components/open_meteo/diagnostics.py
index a429b0c368f..a88325066fe 100644
--- a/homeassistant/components/open_meteo/diagnostics.py
+++ b/homeassistant/components/open_meteo/diagnostics.py
@@ -1,7 +1,6 @@
 """Diagnostics support for Open-Meteo."""
 from __future__ import annotations
 
-import json
 from typing import Any
 
 from open_meteo import Forecast
@@ -25,6 +24,4 @@ async def async_get_config_entry_diagnostics(
 ) -> dict[str, Any]:
     """Return diagnostics for a config entry."""
     coordinator: DataUpdateCoordinator[Forecast] = hass.data[DOMAIN][entry.entry_id]
-    # Round-trip via JSON to trigger serialization
-    data: dict[str, Any] = json.loads(coordinator.data.json())
-    return async_redact_data(data, TO_REDACT)
+    return async_redact_data(coordinator.data.to_dict(), TO_REDACT)
diff --git a/homeassistant/components/open_meteo/manifest.json b/homeassistant/components/open_meteo/manifest.json
index 1819a1deaa8..abdb59a48d0 100644
--- a/homeassistant/components/open_meteo/manifest.json
+++ b/homeassistant/components/open_meteo/manifest.json
@@ -7,5 +7,5 @@
   "documentation": "https://www.home-assistant.io/integrations/open_meteo",
   "integration_type": "service",
   "iot_class": "cloud_polling",
-  "requirements": ["open-meteo==0.2.1"]
+  "requirements": ["open-meteo==0.3.1"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index 937853b3318..4ac5f5b1b0f 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1370,7 +1370,7 @@ onvif-zeep-async==3.1.12
 open-garage==0.2.0
 
 # homeassistant.components.open_meteo
-open-meteo==0.2.1
+open-meteo==0.3.1
 
 # homeassistant.components.openai_conversation
 openai==0.27.2
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 331a099f1ba..fa92508a1e8 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1066,7 +1066,7 @@ onvif-zeep-async==3.1.12
 open-garage==0.2.0
 
 # homeassistant.components.open_meteo
-open-meteo==0.2.1
+open-meteo==0.3.1
 
 # homeassistant.components.openai_conversation
 openai==0.27.2
diff --git a/tests/components/open_meteo/conftest.py b/tests/components/open_meteo/conftest.py
index cb950dcc442..76bb3039a2f 100644
--- a/tests/components/open_meteo/conftest.py
+++ b/tests/components/open_meteo/conftest.py
@@ -40,7 +40,7 @@ def mock_open_meteo(request: pytest.FixtureRequest) -> Generator[None, MagicMock
     if hasattr(request, "param") and request.param:
         fixture = request.param
 
-    forecast = Forecast.parse_raw(load_fixture(fixture, DOMAIN))
+    forecast = Forecast.from_json(load_fixture(fixture, DOMAIN))
     with patch(
         "homeassistant.components.open_meteo.OpenMeteo", autospec=True
     ) as open_meteo_mock: