In MyWeather you can use a button to cycle through the 4 day overview and the 4 upcoming days. If you press the button the text on the button will be "4 day forecast" and then the upcoming 4 days (in this case "Saturday, Sunday, Monday, Tuesday"). This ONLY works if you have selected English as the language in MP. I have tested with Dutch and German and then it does NOT show the names of the days, the text stays the same.

Just to make sure. I am talking about the button marked in the image http://home.ict.nl/~mweterin/mp/weather.jpg