diff --git a/homeassistant/components/homeassistant/triggers/state.py b/homeassistant/components/homeassistant/triggers/state.py
index 5dd7335f56e..8a03905d98d 100644
--- a/homeassistant/components/homeassistant/triggers/state.py
+++ b/homeassistant/components/homeassistant/triggers/state.py
@@ -85,6 +85,10 @@ async def async_attach_trigger(
     attribute = config.get(CONF_ATTRIBUTE)
     job = HassJob(action)
 
+    _variables = {}
+    if automation_info:
+        _variables = automation_info.get("variables") or {}
+
     @callback
     def state_automation_listener(event: Event):
         """Listen for state changes and calls action."""
@@ -143,7 +147,7 @@ async def async_attach_trigger(
             call_action()
             return
 
-        variables = {
+        trigger_info = {
             "trigger": {
                 "platform": "state",
                 "entity_id": entity,
@@ -151,6 +155,7 @@ async def async_attach_trigger(
                 "to_state": to_s,
             }
         }
+        variables = {**_variables, **trigger_info}
 
         try:
             period[entity] = cv.positive_time_period(
diff --git a/tests/components/homeassistant/triggers/test_state.py b/tests/components/homeassistant/triggers/test_state.py
index dd98dbc429c..2cf2081f018 100644
--- a/tests/components/homeassistant/triggers/test_state.py
+++ b/tests/components/homeassistant/triggers/test_state.py
@@ -984,6 +984,33 @@ async def test_if_fires_on_change_with_for_template_3(hass, calls):
     assert len(calls) == 1
 
 
+async def test_if_fires_on_change_with_for_template_4(hass, calls):
+    """Test for firing on change with for template."""
+    assert await async_setup_component(
+        hass,
+        automation.DOMAIN,
+        {
+            automation.DOMAIN: {
+                "trigger_variables": {"seconds": 5},
+                "trigger": {
+                    "platform": "state",
+                    "entity_id": "test.entity",
+                    "to": "world",
+                    "for": {"seconds": "{{ seconds }}"},
+                },
+                "action": {"service": "test.automation"},
+            }
+        },
+    )
+
+    hass.states.async_set("test.entity", "world")
+    await hass.async_block_till_done()
+    assert len(calls) == 0
+    async_fire_time_changed(hass, dt_util.utcnow() + timedelta(seconds=10))
+    await hass.async_block_till_done()
+    assert len(calls) == 1
+
+
 async def test_if_fires_on_change_from_with_for(hass, calls):
     """Test for firing on change with from/for."""
     assert await async_setup_component(
@@ -1269,3 +1296,64 @@ async def test_attribute_if_fires_on_entity_change_with_both_filters_boolean(
     hass.states.async_set("test.entity", "bla", {"happening": True})
     await hass.async_block_till_done()
     assert len(calls) == 1
+
+
+async def test_variables_priority(hass, calls):
+    """Test an externally defined trigger variable is overridden."""
+    assert await async_setup_component(
+        hass,
+        automation.DOMAIN,
+        {
+            automation.DOMAIN: {
+                "trigger_variables": {"trigger": "illegal"},
+                "trigger": {
+                    "platform": "state",
+                    "entity_id": ["test.entity_1", "test.entity_2"],
+                    "to": "world",
+                    "for": '{{ 5 if trigger.entity_id == "test.entity_1"'
+                    "   else 10 }}",
+                },
+                "action": {
+                    "service": "test.automation",
+                    "data_template": {
+                        "some": "{{ trigger.entity_id }} - {{ trigger.for }}"
+                    },
+                },
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    utcnow = dt_util.utcnow()
+    with patch("homeassistant.core.dt_util.utcnow") as mock_utcnow:
+        mock_utcnow.return_value = utcnow
+        hass.states.async_set("test.entity_1", "world")
+        await hass.async_block_till_done()
+        mock_utcnow.return_value += timedelta(seconds=1)
+        async_fire_time_changed(hass, mock_utcnow.return_value)
+        hass.states.async_set("test.entity_2", "world")
+        await hass.async_block_till_done()
+        mock_utcnow.return_value += timedelta(seconds=1)
+        async_fire_time_changed(hass, mock_utcnow.return_value)
+        hass.states.async_set("test.entity_2", "hello")
+        await hass.async_block_till_done()
+        mock_utcnow.return_value += timedelta(seconds=1)
+        async_fire_time_changed(hass, mock_utcnow.return_value)
+        hass.states.async_set("test.entity_2", "world")
+        await hass.async_block_till_done()
+        assert len(calls) == 0
+        mock_utcnow.return_value += timedelta(seconds=3)
+        async_fire_time_changed(hass, mock_utcnow.return_value)
+        await hass.async_block_till_done()
+        assert len(calls) == 1
+        assert calls[0].data["some"] == "test.entity_1 - 0:00:05"
+
+        mock_utcnow.return_value += timedelta(seconds=3)
+        async_fire_time_changed(hass, mock_utcnow.return_value)
+        await hass.async_block_till_done()
+        assert len(calls) == 1
+        mock_utcnow.return_value += timedelta(seconds=5)
+        async_fire_time_changed(hass, mock_utcnow.return_value)
+        await hass.async_block_till_done()
+        assert len(calls) == 2
+        assert calls[1].data["some"] == "test.entity_2 - 0:00:10"