Rain can have a noticeable impact on radio waves and telecommunications by causing signal attenuation or weakening. When raindrops are present in the atmosphere, they can absorb and scatter radio waves as they travel through the air. This can lead to a decrease in signal strength and quality, resulting in disruptions or interference in radio communication and telecommunications systems. Heavy rainfall can also cause signal loss or complete signal blockage in extreme cases, which may hinder the overall operation of these systems.