Yes, weather can drastically change day to day. You might be leaving your house without needing a raincoat then while you are on your way to your destination, you can feel raindrops on your head. Weather is an atmospheric state to describe the degree of its hotness or coldness, wetness or dryness, etc. The elements of weather are moisture, air pressure, and temperature between different places.
Depending on one’s location in the world, you might be experiencing drastic weather change in a day or a week. To be prepared in the ever-changing of weather, be aware of what season your country is experiencing for that particular month. It is also best to hear the news so you can prepare if you will be needing to put sunblock lotion or wear your rain boots.