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Why raindrops fall slanted? Even if there are not any wind or air current, rainfall seems to fall in sideways or diagonally. Why raindrops fall at an angle instead of falling straight down?
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There are many reasons for raindrops to fall in an angle. One reason is that they may find an air current more available instead of in an immediate vicinity. Also, raindrop size may be important in determining an angle. In fact, many If you look at a list of reasons for raindrops to fall in an angle, you will see that many of them have something to do with the angle of incidence (the angle of the raindrop), location, or distribution. For example, a slant raindrop may be available in the morning but many offer thenoon sun while early evening rain is Chandler's favorite type of raindrop.

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Raindrops are actually falling down vertically and if a wind current is there it will be slanted. The more the wind, the more diagonal it seems. But here the question is why it is slanted or falling at an angle even without a minute breeze?!

It is nothing but the rotation of earth causes such an illusion to us that the rainfall is slanted or falling sideways. Even though the raindrops are also in the earth's magnetic field, there will be a small distortion when it is falling which make us feel like rainfall is not coming down straight.

 Yes a small inclination is there even while it's raining pleasant without any air current.
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Wow this is an interesting question indeed. Am wondering what prompted such a question. Let me start by saying, am not a scientist and i do not have the scientific answer for it.

Is there really any logical answer as to why the rain falls slanting as you have put it? Well the one thing i know science has an answer to all questions but there are some things trully that cannot be answered. I know God created the earth the sun and the rain and he knows why the sun sets in the East and rises in the West, it could as well rise in the North and set in South, he knows why the rain falls horizontally and diagnolly right? If i was to give the answer i would probably say its because of the wind,  when it blows on the right the rain will fall in that direction and vice versa. I don't think the rain falls without the presence of wind does it? That is something i will have to really look into and watch documentaries on rainfall to find out what truly happens in the earth when it is raining. Rain comes from the clouds in the sky, when it comes down we know it condenses, but when its up there in the middle of the sky and the ground who knows what happens for it to go sideways or cime straight down there is no logical reason am yet to find out.
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In the event of a breeze, the rain falls through the air. Rain follows along with it as it moves laterally relative to the ground. The wind will feel angular to the Earth and stationary observers on the ground since they are not moving relative to the air.
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This phenomenon is caused by the fact that raindrops are not perfectly round and aerodynamic. Raindrops are typically shaped like hamburger buns, with a wider top and a more pointed bottom. This shape helps the raindrops to fall more quickly, but also causes them to be pushed sideways by air currents, even if the air is very still. The sideways push causes the raindrops to fall at an angle.
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A wind current will cause raindrops to slant since they are actually coming down vertically. More diagonal it appears the stronger the wind. However, this raises the question of why it is angled or falling at an angle despite being completely still.
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The angle at which raindrops fall depends on the speed of the wind and the height of the ground. In general, raindrops fall in an angle, because they fall at an angle to the wind. For example, if the wind speeds are about 120mph and the ground speed is about 100ft, then raindrops will fall at an angle of about 20mph.
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