[ModelSim] How to see local variables in VHDL procedures in waveforms?

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you can label your process and then add it to the waveform manually. To do this:

1- Generate a simple waveform without variables

2- save it with .do format. For example my_wave_1.do

3- Manually open the my_wave_1.do file in a text editor and add your variable to a line. You can copy/paste previous lines for simplicity. Then replace the signal name with your variable name: dut/my_process/v_variable

4- Save your edited .do file

5- now run in the console: do my_wave_1.do

6- Run Simulation

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The OP asked for procedures not processes.