Welcome to the forums! Its easier to read your code if you put the code tags </> around it.
Perhaps you need to declare suhu outside of the loop() function or use the static keyword to prevent it being re-initialised every time loop() is run.
void loop()
{
int Sensorsuhu = analogRead(A0);
static int suhu[10];
float temp1, mean1;
You will find your code is more compact and easy to read if you learn about for-loops eg
temp1 = suhu[0] + suhu [1] + suhu[2] + suhu[3] + suhu[4] + suhu[5] + suhu[6] + suhu[7] + suhu[8] + suhu[9];
Might become
temp1=0;
for (i=0; i<=9; i++) {
temp1=temp1+suhu[i];
}