diff --git a/homeassistant/components/prometheus/__init__.py b/homeassistant/components/prometheus/__init__.py
index 654e6245a57..1a70e4cf78e 100644
--- a/homeassistant/components/prometheus/__init__.py
+++ b/homeassistant/components/prometheus/__init__.py
@@ -225,7 +225,7 @@ class PrometheusMetrics:
         try:
             value = state_helper.state_as_number(state)
         except ValueError:
-            _LOGGER.warning("Could not convert %s to float", state)
+            _LOGGER.debug("Could not convert %s to float", state)
             value = 0
         return value