It has gone rather cold and damp for spraying nitro. Too cold and/or humid and you get water vapour condensing and being trapped in the finish, which isn't a good look. Spraying with a gun, you can add anti-bloom thinners, which helps, but it can only do so much.
If spraying from a can, I'd put the mask on, and spray in a pre-heated shed with the door closed. Turn the heater off before spraying. Then leave the shed, shut the door again for 5 minutes or so, during which time the nitro will become touch dry and then open the door to vent the shed for 30 mins+. You can then shut the door and warm up the shed again. It's not ideal, but as long as you keep the interior over 16°C and it feels dry, it should be OK.
I'd certainly do a test spray on a piece of wood first before spraying the guitar, just in case you do notice any 'bloom' occurring.
I'd also try and rig up an internal spray area with old sheets or cardboard to stop the overspray from spreading all over the shed.
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