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In the last third of March the maximal temperature during the day is typically between 6 and 14°C, sporadically drastic amplitudes to higher or lower temperatures are possible. At night, temperatures drop down to –2 to 6°C, temperatures down to –6°C are not uncommon. Typically, there is a very rapid alteration between sunny and cloudy, calm and windy as well as dry and wet weather including snow, graupel, hail, rain and thunderstorms. But it can also be completely different whatever this means. In summary, you should be prepared for any kind of weather with the exception of very hot temperatures. Have a look on http://www.wetteronline.de/Berlin/Berlin.htm for the weather forecast.