diff --git a/homeassistant/components/forecast_solar/__init__.py b/homeassistant/components/forecast_solar/__init__.py
index e10d9651c3b..c6d4236c219 100644
--- a/homeassistant/components/forecast_solar/__init__.py
+++ b/homeassistant/components/forecast_solar/__init__.py
@@ -5,12 +5,38 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 
-from .const import DOMAIN
+from .const import (
+    CONF_DAMPING,
+    CONF_DAMPING_EVENING,
+    CONF_DAMPING_MORNING,
+    CONF_MODULES_POWER,
+    DOMAIN,
+)
 from .coordinator import ForecastSolarDataUpdateCoordinator
 
 PLATFORMS = [Platform.SENSOR]
 
 
+async def async_migrate_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Migrate old config entry."""
+
+    if entry.version == 1:
+        new_options = entry.options.copy()
+        new_options |= {
+            CONF_MODULES_POWER: new_options.pop("modules power"),
+            CONF_DAMPING_MORNING: new_options.get(CONF_DAMPING, 0.0),
+            CONF_DAMPING_EVENING: new_options.pop(CONF_DAMPING, 0.0),
+        }
+
+        entry.version = 2
+
+        hass.config_entries.async_update_entry(
+            entry, data=entry.data, options=new_options
+        )
+
+    return True
+
+
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set up Forecast.Solar from a config entry."""
     coordinator = ForecastSolarDataUpdateCoordinator(hass, entry)
diff --git a/homeassistant/components/forecast_solar/config_flow.py b/homeassistant/components/forecast_solar/config_flow.py
index e74585da35b..47e1afaec7b 100644
--- a/homeassistant/components/forecast_solar/config_flow.py
+++ b/homeassistant/components/forecast_solar/config_flow.py
@@ -14,7 +14,8 @@ from homeassistant.helpers import config_validation as cv
 
 from .const import (
     CONF_AZIMUTH,
-    CONF_DAMPING,
+    CONF_DAMPING_EVENING,
+    CONF_DAMPING_MORNING,
     CONF_DECLINATION,
     CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
@@ -27,7 +28,7 @@ RE_API_KEY = re.compile(r"^[a-zA-Z0-9]{16}$")
 class ForecastSolarFlowHandler(ConfigFlow, domain=DOMAIN):
     """Handle a config flow for Forecast.Solar."""
 
-    VERSION = 1
+    VERSION = 2
 
     @staticmethod
     @callback
@@ -127,8 +128,16 @@ class ForecastSolarOptionFlowHandler(OptionsFlow):
                         default=self.config_entry.options[CONF_MODULES_POWER],
                     ): vol.Coerce(int),
                     vol.Optional(
-                        CONF_DAMPING,
-                        default=self.config_entry.options.get(CONF_DAMPING, 0.0),
+                        CONF_DAMPING_MORNING,
+                        default=self.config_entry.options.get(
+                            CONF_DAMPING_MORNING, 0.0
+                        ),
+                    ): vol.Coerce(float),
+                    vol.Optional(
+                        CONF_DAMPING_EVENING,
+                        default=self.config_entry.options.get(
+                            CONF_DAMPING_EVENING, 0.0
+                        ),
                     ): vol.Coerce(float),
                     vol.Optional(
                         CONF_INVERTER_SIZE,
diff --git a/homeassistant/components/forecast_solar/const.py b/homeassistant/components/forecast_solar/const.py
index e566733413b..24273f32405 100644
--- a/homeassistant/components/forecast_solar/const.py
+++ b/homeassistant/components/forecast_solar/const.py
@@ -8,6 +8,8 @@ LOGGER = logging.getLogger(__package__)
 
 CONF_DECLINATION = "declination"
 CONF_AZIMUTH = "azimuth"
-CONF_MODULES_POWER = "modules power"
+CONF_MODULES_POWER = "modules_power"
 CONF_DAMPING = "damping"
+CONF_DAMPING_MORNING = "damping_morning"
+CONF_DAMPING_EVENING = "damping_evening"
 CONF_INVERTER_SIZE = "inverter_size"
diff --git a/homeassistant/components/forecast_solar/coordinator.py b/homeassistant/components/forecast_solar/coordinator.py
index 273d3a49a2f..2ef6912e5a2 100644
--- a/homeassistant/components/forecast_solar/coordinator.py
+++ b/homeassistant/components/forecast_solar/coordinator.py
@@ -13,7 +13,8 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from .const import (
     CONF_AZIMUTH,
-    CONF_DAMPING,
+    CONF_DAMPING_EVENING,
+    CONF_DAMPING_MORNING,
     CONF_DECLINATION,
     CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
@@ -48,7 +49,8 @@ class ForecastSolarDataUpdateCoordinator(DataUpdateCoordinator[Estimate]):
             declination=entry.options[CONF_DECLINATION],
             azimuth=(entry.options[CONF_AZIMUTH] - 180),
             kwp=(entry.options[CONF_MODULES_POWER] / 1000),
-            damping=entry.options.get(CONF_DAMPING, 0),
+            damping_morning=entry.options.get(CONF_DAMPING_MORNING, 0.0),
+            damping_evening=entry.options.get(CONF_DAMPING_EVENING, 0.0),
             inverter=inverter_size,
         )
 
diff --git a/homeassistant/components/forecast_solar/strings.json b/homeassistant/components/forecast_solar/strings.json
index 43e6fca4ada..1413dba23d4 100644
--- a/homeassistant/components/forecast_solar/strings.json
+++ b/homeassistant/components/forecast_solar/strings.json
@@ -24,10 +24,11 @@
         "data": {
           "api_key": "Forecast.Solar API Key (optional)",
           "azimuth": "[%key:component::forecast_solar::config::step::user::data::azimuth%]",
-          "damping": "Damping factor: adjusts the results in the morning and evening",
+          "damping_morning": "Damping factor: adjusts the results in the morning",
+          "damping_evening": "Damping factor: adjusts the results in the evening",
           "inverter_size": "Inverter size (Watt)",
           "declination": "[%key:component::forecast_solar::config::step::user::data::declination%]",
-          "modules power": "[%key:component::forecast_solar::config::step::user::data::modules_power%]"
+          "modules_power": "[%key:component::forecast_solar::config::step::user::data::modules_power%]"
         }
       }
     }
diff --git a/tests/components/forecast_solar/conftest.py b/tests/components/forecast_solar/conftest.py
index 60e9c9dc5d0..06cf39b4875 100644
--- a/tests/components/forecast_solar/conftest.py
+++ b/tests/components/forecast_solar/conftest.py
@@ -9,7 +9,8 @@ import pytest
 
 from homeassistant.components.forecast_solar.const import (
     CONF_AZIMUTH,
-    CONF_DAMPING,
+    CONF_DAMPING_EVENING,
+    CONF_DAMPING_MORNING,
     CONF_DECLINATION,
     CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
@@ -37,6 +38,7 @@ def mock_config_entry() -> MockConfigEntry:
     return MockConfigEntry(
         title="Green House",
         unique_id="unique",
+        version=2,
         domain=DOMAIN,
         data={
             CONF_LATITUDE: 52.42,
@@ -47,7 +49,8 @@ def mock_config_entry() -> MockConfigEntry:
             CONF_DECLINATION: 30,
             CONF_AZIMUTH: 190,
             CONF_MODULES_POWER: 5100,
-            CONF_DAMPING: 0.5,
+            CONF_DAMPING_MORNING: 0.5,
+            CONF_DAMPING_EVENING: 0.5,
             CONF_INVERTER_SIZE: 2000,
         },
     )
diff --git a/tests/components/forecast_solar/snapshots/test_diagnostics.ambr b/tests/components/forecast_solar/snapshots/test_diagnostics.ambr
index 147c10c1793..686721a9d4a 100644
--- a/tests/components/forecast_solar/snapshots/test_diagnostics.ambr
+++ b/tests/components/forecast_solar/snapshots/test_diagnostics.ambr
@@ -33,10 +33,11 @@
       'options': dict({
         'api_key': '**REDACTED**',
         'azimuth': 190,
-        'damping': 0.5,
+        'damping_evening': 0.5,
+        'damping_morning': 0.5,
         'declination': 30,
         'inverter_size': 2000,
-        'modules power': 5100,
+        'modules_power': 5100,
       }),
       'title': 'Green House',
     }),
diff --git a/tests/components/forecast_solar/snapshots/test_init.ambr b/tests/components/forecast_solar/snapshots/test_init.ambr
new file mode 100644
index 00000000000..a009105e2e6
--- /dev/null
+++ b/tests/components/forecast_solar/snapshots/test_init.ambr
@@ -0,0 +1,27 @@
+# serializer version: 1
+# name: test_migration
+  ConfigEntrySnapshot({
+    'data': dict({
+      'latitude': 52.42,
+      'longitude': 4.42,
+    }),
+    'disabled_by': None,
+    'domain': 'forecast_solar',
+    'entry_id': <ANY>,
+    'options': dict({
+      'api_key': 'abcdef12345',
+      'azimuth': 190,
+      'damping_evening': 0.5,
+      'damping_morning': 0.5,
+      'declination': 30,
+      'inverter_size': 2000,
+      'modules_power': 5100,
+    }),
+    'pref_disable_new_entities': False,
+    'pref_disable_polling': False,
+    'source': 'user',
+    'title': 'Green House',
+    'unique_id': 'unique',
+    'version': 2,
+  })
+# ---
diff --git a/tests/components/forecast_solar/test_config_flow.py b/tests/components/forecast_solar/test_config_flow.py
index 2129821217e..06aeb94542e 100644
--- a/tests/components/forecast_solar/test_config_flow.py
+++ b/tests/components/forecast_solar/test_config_flow.py
@@ -3,7 +3,8 @@ from unittest.mock import AsyncMock
 
 from homeassistant.components.forecast_solar.const import (
     CONF_AZIMUTH,
-    CONF_DAMPING,
+    CONF_DAMPING_EVENING,
+    CONF_DAMPING_MORNING,
     CONF_DECLINATION,
     CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
@@ -75,7 +76,8 @@ async def test_options_flow_invalid_api(
             CONF_DECLINATION: 21,
             CONF_AZIMUTH: 22,
             CONF_MODULES_POWER: 2122,
-            CONF_DAMPING: 0.25,
+            CONF_DAMPING_MORNING: 0.25,
+            CONF_DAMPING_EVENING: 0.25,
             CONF_INVERTER_SIZE: 2000,
         },
     )
@@ -108,7 +110,8 @@ async def test_options_flow(
             CONF_DECLINATION: 21,
             CONF_AZIMUTH: 22,
             CONF_MODULES_POWER: 2122,
-            CONF_DAMPING: 0.25,
+            CONF_DAMPING_MORNING: 0.25,
+            CONF_DAMPING_EVENING: 0.25,
             CONF_INVERTER_SIZE: 2000,
         },
     )
@@ -120,7 +123,8 @@ async def test_options_flow(
         CONF_DECLINATION: 21,
         CONF_AZIMUTH: 22,
         CONF_MODULES_POWER: 2122,
-        CONF_DAMPING: 0.25,
+        CONF_DAMPING_MORNING: 0.25,
+        CONF_DAMPING_EVENING: 0.25,
         CONF_INVERTER_SIZE: 2000,
     }
 
@@ -147,7 +151,8 @@ async def test_options_flow_without_key(
             CONF_DECLINATION: 21,
             CONF_AZIMUTH: 22,
             CONF_MODULES_POWER: 2122,
-            CONF_DAMPING: 0.25,
+            CONF_DAMPING_MORNING: 0.25,
+            CONF_DAMPING_EVENING: 0.25,
             CONF_INVERTER_SIZE: 2000,
         },
     )
@@ -159,6 +164,7 @@ async def test_options_flow_without_key(
         CONF_DECLINATION: 21,
         CONF_AZIMUTH: 22,
         CONF_MODULES_POWER: 2122,
-        CONF_DAMPING: 0.25,
+        CONF_DAMPING_MORNING: 0.25,
+        CONF_DAMPING_EVENING: 0.25,
         CONF_INVERTER_SIZE: 2000,
     }
diff --git a/tests/components/forecast_solar/test_init.py b/tests/components/forecast_solar/test_init.py
index a7696fe8f53..25dcb41c976 100644
--- a/tests/components/forecast_solar/test_init.py
+++ b/tests/components/forecast_solar/test_init.py
@@ -2,9 +2,17 @@
 from unittest.mock import MagicMock, patch
 
 from forecast_solar import ForecastSolarConnectionError
+from syrupy import SnapshotAssertion
 
-from homeassistant.components.forecast_solar.const import DOMAIN
+from homeassistant.components.forecast_solar.const import (
+    CONF_AZIMUTH,
+    CONF_DAMPING,
+    CONF_DECLINATION,
+    CONF_INVERTER_SIZE,
+    DOMAIN,
+)
 from homeassistant.config_entries import ConfigEntryState
+from homeassistant.const import CONF_API_KEY, CONF_LATITUDE, CONF_LONGITUDE
 from homeassistant.core import HomeAssistant
 from homeassistant.setup import async_setup_component
 
@@ -44,3 +52,29 @@ async def test_config_entry_not_ready(
 
     assert mock_request.call_count == 1
     assert mock_config_entry.state is ConfigEntryState.SETUP_RETRY
+
+
+async def test_migration(hass: HomeAssistant, snapshot: SnapshotAssertion) -> None:
+    """Test config entry version 1 -> 2 migration."""
+    mock_config_entry = MockConfigEntry(
+        title="Green House",
+        unique_id="unique",
+        domain=DOMAIN,
+        data={
+            CONF_LATITUDE: 52.42,
+            CONF_LONGITUDE: 4.42,
+        },
+        options={
+            CONF_API_KEY: "abcdef12345",
+            CONF_DECLINATION: 30,
+            CONF_AZIMUTH: 190,
+            "modules power": 5100,
+            CONF_DAMPING: 0.5,
+            CONF_INVERTER_SIZE: 2000,
+        },
+    )
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert hass.config_entries.async_get_entry(mock_config_entry.entry_id) == snapshot