diff --git a/homeassistant/components/aemet/sensor.py b/homeassistant/components/aemet/sensor.py
index 370d12a34c2..f22c6d321b1 100644
--- a/homeassistant/components/aemet/sensor.py
+++ b/homeassistant/components/aemet/sensor.py
@@ -7,8 +7,10 @@ from homeassistant.const import ATTR_ATTRIBUTION
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
+from homeassistant.util import dt as dt_util
 
 from .const import (
+    ATTR_FORECAST_TIME,
     ATTRIBUTION,
     DOMAIN,
     ENTRY_NAME,
@@ -137,4 +139,6 @@ class AemetForecastSensor(AbstractAemetSensor):
         )
         if forecasts:
             forecast = forecasts[0].get(self.entity_description.key)
+            if self.entity_description.key == ATTR_FORECAST_TIME:
+                forecast = dt_util.parse_datetime(forecast)
         return forecast
diff --git a/homeassistant/components/aemet/weather_update_coordinator.py b/homeassistant/components/aemet/weather_update_coordinator.py
index d791158b9de..c86465ea8f1 100644
--- a/homeassistant/components/aemet/weather_update_coordinator.py
+++ b/homeassistant/components/aemet/weather_update_coordinator.py
@@ -286,7 +286,7 @@ class WeatherUpdateCoordinator(DataUpdateCoordinator):
         temperature_feeling = None
         town_id = None
         town_name = None
-        town_timestamp = dt_util.as_utc(elaborated).isoformat()
+        town_timestamp = dt_util.as_utc(elaborated)
         wind_bearing = None
         wind_max_speed = None
         wind_speed = None
@@ -312,7 +312,7 @@ class WeatherUpdateCoordinator(DataUpdateCoordinator):
 
         # Overwrite weather values with closest station data (if present)
         if station_data:
-            station_timestamp = dt_util.as_utc(station_dt).isoformat()
+            station_timestamp = dt_util.as_utc(station_dt)
             if (now_utc - station_dt) <= STATION_MAX_DELTA:
                 if AEMET_ATTR_STATION_HUMIDITY in station_data:
                     humidity = format_float(station_data[AEMET_ATTR_STATION_HUMIDITY])