There are several things you need to do. First, there needs to be some way for Processing to tell when one value ends and another begins. Right now, you are sending "70.2570.2570.25" to the serial port.
You need to have the Arduino use Serial.println() in printTemperature().
In Processing, handling serial data is not a task that draw() should perform. You need a serialEvent() callback that reads the serial data.
You need to add a myPort.bufferUntil() call to setup() to tell Processing to buffer data until some specific character, like a carriage return or a line feed, arrives.
text("TEMPERATURES:",10,50);
text("Temp 1:",10,100);
text("Temp 2:",10,150);
text("Temp 3:",10,200);
These are headers and titles. Nowhere do you actually create text for the data.