Hi ! Is it possible to share 1 x DHT22 to two arduinos? Maybe powering it from one and the sensor pin to both?
The simple answer is 'no'. If both Arduinos request data and those requests overlap, they will both get garbage.
But it may be possible to program the second Arduino to observe the activity on the data pin and identify when the first one requested data. Then it can also record a copy of that same data. It would mean the second one doesn't have a lot of time available to do other tasks since it is always watching what the first one does.
A more reliable solution is to have one Arduino directly connected to the DHT22 and then it can send the results to the other, using a communication system that you choose.
Or just buy two sensors?