The plugin looks nice - it took a few attempts on the website to get the weather ID, but I finally did.
Here's the problem - perhaps the plugin is being "smart" about the city it's displaying the weather for, and deciding to use celsius or fahrenheit based on that. I looked everywhere, but did not see where I could select the scale to use.
I have a website intended for U.S. people to travel to Brazil. While the temperature in Brazil is discussed in celsius, it means nothing to the U.S. people who want to know the temperature there in Fahrenheit.
So I really can't use this plugin unless I can choose which scale to display the temperature. Great start, however!