The raindrops are spherical due to

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As we know that a fluid always tends to minimize it's surface area due to SURFACE TENSION.

Now, for a given volume the sphere has the least surface area(You can prove this by concept of maxima/minima. I can provide the proof if you'll want), therefore raindrops acquire spherical shape.

NOTE: The real shape of raindrops are an approximate OVAL due to the effect of gravity. But for very small droplets force of gravity is negligibly small & we can consider their shape as being spherical ideally.