You could use a Custom Tile to add the periodic refreshing capability (though I’m surprised the Windy site doesn’t automatically refresh its own content periodically).
Here’s a Refreshable URL Embed custom tile I just put together:
Import the tile using the link above, then scroll down and press Save. Then go to your Dashboard → Edit → Add Tile → Other → Custom Tile → Refreshable URL Embed. Once you’ve added the tile, edit it and configure the URL and optionally a refresh interval (in minutes).