[werk_ag]

Well, from what you say, you can be sure that your WiFi module is working properly, the fact that it is not uploading data to WU surely is caused by any other reason.

You may try to uncomment this line in Config_Options

Code:

//#define PRINT_DEBUG_WU_UPLOAD       // Prints to serial monitor messages related to Weather Underground upload.

and watch what you get on the serial monitor.