Before you even climb out of bed in the morning, you can find out what the weather is like outside, as well as the forecast for the rest of the day and week.
Checking the current weather forecast is very simple:
Hey Siri, how warm is it going to be today?
You can also ask weather questions that are a little more specific:
Is it going to rain this week?
Is there a chance of rain tonight?
You can check on the detailed weather forecast for any location around the world, you can also specify whether you want the results to be displayed in celsius or fahrenheit. For example:
How hot is it in New York in Fahrenheit?
To take it even further you can ask whether you'll need a raincoat or sunglasses, even at specific times of day:
Will I need an umbrella tomorrow morning?
As you can see, Siri can understand relatively informal questions about the weather, and give accurate answers. Usually offering a casual opinion of its own.