diff --git a/weather/display.go b/weather/display.go
index 1b237789..9acd9e3d 100644
--- a/weather/display.go
+++ b/weather/display.go
@@ -11,6 +11,11 @@ import (
 func (widget *Widget) display() {
 	widget.View.Clear()
 
+	if widget.apiKeyValid() == false {
+		fmt.Fprintf(widget.View, "%s", " Environment variable WTF_OWM_API_KEY is not set")
+		return
+	}
+
 	cityData := widget.currentData()
 	if cityData == nil {
 		fmt.Fprintf(widget.View, "%s", " Weather data is unavailable (1)")
diff --git a/weather/widget.go b/weather/widget.go
index 992c7207..fa92b60d 100644
--- a/weather/widget.go
+++ b/weather/widget.go
@@ -104,6 +104,18 @@ func (widget *Widget) Prev() {
 
 /* -------------------- Unexported Functions -------------------- */
 
+func (widget *Widget) apiKeyValid() bool {
+	if widget.APIKey == "" {
+		return false
+	}
+
+	if len(widget.APIKey) != 32 {
+		return false
+	}
+
+	return true
+}
+
 func (widget *Widget) currentData() *owm.CurrentWeatherData {
 	if len(widget.Data) == 0 {
 		return nil