The weather widget is really annoying most of the time it's 66 even after turning on location and refreshing still 66 its funny in weather.com its 67 so why is the widget wrong and most of the time 66? Samsung please fix the weather widget it's time for an update.
which model do you have?
is the weather app up to date? have you checked the Auto refresh in the weather app settings?
submit an error report via samsung members app if you think it's an issue with the weather app widget (members app > + button > error report)