Does this weather often occur in areas controlled by cyclones?

It is related to the movement of frontal rain belt.

In July and August, the precipitation in the middle and lower reaches of the Yangtze River is less, because the frontal rain belt has moved northward to North China.

But the frontal rain belt moved away.

This doesn't mean that this place is empty.

On the contrary, the rain took it away.

That place is controlled by an anticyclone.

To put it bluntly.

It's subtropical high

Therefore, the main cause of summer drought is controlled by subtropical high.

It's not the rain that takes away less precipitation.