What could the weather be like this autumn?

It's officially the end of summer today which means it's also the autumn equinox!

Equinoxes and solstices are key dates in the calendar. They are used to define the transitional periods between the seasons, so when winter changes to spring, summer to autumn, and so on.

But the arrival of autumn means those sunny days could be on the way out, darker mornings and evenings are on their way and warm days will start to get a bit chillier.

Here's BBC Weather's Simon King to explain.