Hi Bharat ! If you're planning to go to other states from Bagdogra like Assam, Nagaland or Meghalya. Then you should avoid that as rain is continuously happening there and no improvement is expected in upcoming days. Also, train service is stopped at various routes due to this.
But if you're just planning to visit Darjeeling, then it can be done, but just be cautious as generally landslides take places during rains in those areas.