On the panel icon, a middle click forces an update, left click brings up a forecast and details page. There are a lot of tooltips describing the options and values available.
Keep in mind that often values provided by other (even local) providers differ a bit from those at your actual location, some are even more than half an hour old.
Unfortunately, fixing this would be very tricky and time-consuming, and the current developer doesn't want to spend more time on this.
However, this known issue will be fixed in a future 0.9.x version of the plugin, which will need quite a rewrite anyway.
You can quickly and easily access that proper directory from the appearance tab in the settings dialog, there is a button there to create/open it.
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