I have the same issue. Suddenly Current is shown in Kelvin. Setting the units in config.js changes nothing. Alternatively I installed the MMM-WunderGround module and it is showing correctly plus it’s LOADS better. Hourly + extended.

Installed MM on an RPi3 and am using the default Current Weather module. Everything was good for a couple of days but after the latest reboot the Current Weather has switched to Kelvin and the sunset time is off.

I’ve tried adding units: ‘imperial’ to the current weather portion of config.js and it made no difference. If I switch config.units to metric it still displays Kelvin. Weather Forecast displays correctly.

Odd right?