Maybe “widget” isn’t the right term; I’m still learning Linux/Ubuntu/MATE.
When I add the temperature to my taskbar, it always shows 77°, even though I properly set my location. So whatever source it’s using is broken. 
Is there something I can do to fix, or an alternative?
EDIT: This is the weather temp widget for the taskbar. But I’ve since realized that it’s probably because our airport moved. So actually, I need to figure out how to contact whoever maintains that list…
Did you try right click on the weather icon and select Preferences? (3rd one from the top down), where you get additional options? I would show you the pic, but don’t have it set to english right now.
Otherwise I use the one that comes with the clock and calendar, to have all in one.
Yes, as I said, I set my location. (Before you set a location, it shows 0°)
Actually, I just came back to this thread because I’d had an idea and tested it: Our airport moved a couple of years ago, and they’ve shut down the old one. I tested other locations, and it shows the proper temperature. So the problem, I’m guessing, is that the single location shown for my city no longer exists.
So I guess I need to figure out who to contact to get that updated.
I was a little confused which temperature you were referring to -- weather, or the computer's temperature.
Another user had similar problems with this applet -- for them, it wasn't updating and they discovered some broken code.
Alternately, you could try the weather feature in the Clock applet.
Weather can be enabled from the Preferences:
Once you start typing, a popup of locations appear. These could be using a different list:
See also:
@lah7: Using that also shows 77°. I’m pretty sure it’s because the airport is closed.
@wolfman: Yay, thank you! That’s pulling from a service that shows the correct information. 
Hi @ieh,
see posts 1 & 4 here for another alternative:
