Installing outdoor contact sensor in windy area

I have an outdoor contact sensor on a double door gate. One is staked into the ground typically. On very windy days, both gates get pushed just enough to cause the sensor to think that the gate is open. I have the sensors installed near the top of the gates as the gap at the bottom was quite large and I did not want the sensors accidentally damaged by a mower. Does anyone have a suggestion for eliminating this issue? The wind typically is blowing the gates past closed, not in the opening direction. Thank you