Usually the PH level of the rainwater is 5 which is acidic and is more acidic these days so at least boil the water before drinking it for ones safety

Sangeetha Pulapaka

Agreeing with what RAB said -

Not when you have access to clean drinking water. If you are asking about drinking the rain water as it falls from the sky. Still no, because this water is likely to contain traces of atmospheric and environmental pollutants as it falls from the sky. The level of contaminants will vary from site to site therefore some degree of contamination must always be assumed.

Water from rainwater tanks or deep bores is usually safe to drink. However, it can sometimes be contaminated by human, bird or animal faeces, usually from leaking septic tanks, wastewater drainage or bird or animal droppings on roofs.

Rainwater is collected when it falls on the earth, stored and utilized at a later point. It can be purified to make it into drinking water, used for daily applications and even utilized in large scale industries. In short, Rainwater harvesting is a process or technique of collecting, filtering, storing and using rainwater for irrigation and for various other non-drinking purposes.

Do you know about the bird which drinks only rain water?