I have installed the binding and setup everything along the lines of the information in the Wiki - including increasing the log level to DEBUG.
When starting openHAB all log trace reports “proper values” (i.e. API key, latitude, longitude, etc.), however at some point it all ends with the following:
If I try this, I get an error, if I change the http:// to https://, I get an answer.
Seems that I need an update of the weather binding (currently I use 1.7.1).
You could use the nightly build with this fix included. In the addons.zip you should find the weather-1.8.0 snapshot.jar .
Due to disk space issues, the latest build is now 5 days old and does NOT include this fix yet. As I write this post, I noticed that the disk space issue is solved, so probably the new build will start soon.
Just downloaded the addons.zip from last nightly build (#1045) and installed the org.openhab.binding.weather-1.8.0-SNAPSHOT.jar. Restart and the forecast.io update is now running flawlessly !