Piezoelectric ultrasonic windspeed sensors have higher accuracy and reliability than traditional mechanical wind instruments. However, in practical application, the outdoor climatic environment in some areas is complicated, and it will affect the radiated sound field emitted by the ultrasonic transducer in severe weather. The COMSOL finite element analysis software is used to simulate the sound field distribution of the piezoelectric transducer in the radiusspherical region. The boundary conditions of the transducer and air coupling are used to simulate the heavy rains and sandstorms in severe weather conditions, and the sound pressure and sound pressure level of the transducer sound field are compared in several cases. The results show that heavy rains have little effect on the ultrasonic radiation sound field. With the increase of dust concentration, the attenuation of ultrasonic signal becomes more obvious. The simulation results provide a reference and basis for the technical improvement of ultrasonic wind speed sensors in severe weather.