I changed my temp to show in Celcius - icons are correct, but text displayed when clicking into the 4 day forecast show Fahrenheit.
Suggestion:
1) change the show in "celcius" to show "metric" instead - then have celcius show and wind speeds in km/h instead of mph.
2) add a drop down list to change "weather update interval"
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Hmf... my icon is showing F temps instead of C now - launcher is set "yes" for Celsius.. (after a phone reboot).