Harry Potter: Wizards Unite is a game based on walking around the world. As the real world has different weather phenomena, the seasons and times of day affect the in-game world.
Let's start with how to check the in-game weather. When you are on the world map click on the icon marked on the screen above.
When you enter this section you will see the weather view. Any change in weather conditions affects the resources available in the game and the frequency of tracks.
On a bright, hot day, you will encounter many creatures walking on the street. At night, in dark streets you can meet the most terrifying and powerful monsters created in this universe. If you go for a walk on a rainy day you can find more water than on a hot day.
Also, remember that monsters don't like bad weather either. If it's cold outside and it rains, they will hide in warm and cozy places, for example, in your house.