Defining the Weather
Put very simply, weather is the state of the atmosphere at any given period of time.
The atmosphere is made up of the gasses, like oxygen, that surround the Earth. What is happening in the atmosphere is the weather. Weather includes several different factors that we can measure.
Have you ever watched the weather forecast on the news or online?
What kind of things do they tell us?
Most weather forecasts will tell us what the temperature will be, if it's going to rain or snow, and whether it will be cloudy or sunny.
Those factors combine together to make the weather.