diff --git a/homeassistant/components/openweathermap/weather.py b/homeassistant/components/openweathermap/weather.py
index 7908beb61d6..63d63c30147 100644
--- a/homeassistant/components/openweathermap/weather.py
+++ b/homeassistant/components/openweathermap/weather.py
@@ -1,6 +1,7 @@
 """Support for the OpenWeatherMap (OWM) service."""
 from homeassistant.components.weather import WeatherEntity
-from homeassistant.const import TEMP_CELSIUS
+from homeassistant.const import PRESSURE_HPA, PRESSURE_INHG, TEMP_CELSIUS
+from homeassistant.util.pressure import convert as pressure_convert
 
 from .const import (
     ATTR_API_CONDITION,
@@ -82,7 +83,12 @@ class OpenWeatherMapWeather(WeatherEntity):
     @property
     def pressure(self):
         """Return the pressure."""
-        return self._weather_coordinator.data[ATTR_API_PRESSURE]
+        pressure = self._weather_coordinator.data[ATTR_API_PRESSURE]
+        # OpenWeatherMap returns pressure in hPA, so convert to
+        # inHg if we aren't using metric.
+        if not self.hass.config.units.is_metric and pressure:
+            return pressure_convert(pressure, PRESSURE_HPA, PRESSURE_INHG)
+        return pressure
 
     @property
     def humidity(self):