diff --git a/homeassistant/components/sensor/tibber.py b/homeassistant/components/sensor/tibber.py
index 861fd6eff53..703f2bbbd17 100644
--- a/homeassistant/components/sensor/tibber.py
+++ b/homeassistant/components/sensor/tibber.py
@@ -132,6 +132,8 @@ class TibberSensorElPrice(Entity):
         state = None
         max_price = 0
         min_price = 10000
+        sum_price = 0
+        num = 0
         now = dt_util.now()
         for key, price_total in self._tibber_home.price_total.items():
             price_time = dt_util.as_local(dt_util.parse_datetime(key))
@@ -146,8 +148,11 @@ class TibberSensorElPrice(Entity):
             if now.date() == price_time.date():
                 max_price = max(max_price, price_total)
                 min_price = min(min_price, price_total)
+                num += 1
+                sum_price += price_total
         self._state = state
         self._device_state_attributes['max_price'] = max_price
+        self._device_state_attributes['avg_price'] = sum_price / num
         self._device_state_attributes['min_price'] = min_price
         return state is not None