Water and electronics don't mix. However, there are new coatings and technology that allow hearing aids to be very water resistant. There is even one completely waterproof aid on the market and with the correct earmold you can even swim with it! However, with the waterproof aid there are some strict cleaning and maintenance requirements to retain the warranty. So the answer is: Yes! With all the new advances we are no longer worried about a little bit of rain if we get caught outside, or perspiration on those hot days or with exercise.