Use an Arduino Mega in a incubator (high humidity) I wonder whether it is possible to use an Arduino Mega in a cell incubator.

In the incubator there is a temperature of 37°C, 5% CO2 in the atmosphere and a high relative humidity of around 95% - 98%. I think the temperature (specs of ATmega2560, temperature range: -40 °C to 85 °C) and the CO2 is no problem.

But I am concerned the condensation due to the high humidity will cause damage.

One mitigation could be, that I first pre-warm the Arduino Mega so it doesn't condensate.

(There is a possibility that I don't put the Arduino in the incubator at all, but it would be easier if I could).
"-40 °C to 85 °C" for the processor, yes, for the other parts, who knows?

The board doesn't get that hot unless you are powering from like a 12V source, and then it's just the regulator that gets hot.

You could a spray-on conformal coat, Mouser.com carries them. Insert any wires into the headers you will use and cover any headers you may want to use before you spray, if you get coating down into the female headers you may have poor contact later on.

The ziplock bag idea sounds like a good start as a start, put some silicon along the seal to fill the holes where the zipper won't close right next to the wires.