Averages for Berlin in April. Entering the month of April, Berlin in springtime marks fluctuating daily high temperatures. The daily average falls between 13 C to 19°C, however the temperature frequently reaches the 23°C mark, or can even drop back down below 8°C.When it comes to daily low temperatures, ...Read more.he daily average falls between 13 C to 19°C, however the temperature frequently reaches the 23°C mark, or can even drop back down below 8°C. When it comes to daily low temperatures, ...