With only weblogic console access if you wish to find if the weblogic server is running in development or production mode then here is the way:
1. Login to weblogic console at http://server:port/console
2. On the left side under domain structure click on the domain name
3 Click on Configuration --> General tab on the right side
4. There will be a check box Production Mode. If is unchecked then it means it is running in development mode.