That represents a 25% rise over the previous currency conversion, which was 79p.
“Price tiers on the App Store are set internationally on the basis of several factors, including currency exchange rates, business practices, taxes, and the cost of doing business,” it said.
“These factors vary from region to region and over time.”
The rise will also affect in-app purchases but not subscription charges.
A spokeswoman for Google was unable to comment about whether it had plans to alter prices on its Play store for Android apps.
Apple had already adjusted the UK prices of its iPhones and iPads in September and then its Mac computers in October by a similar degree.
Other tech firms to have announced price rises in the country in the months following the Brexit vote – which has been linked to a fall in sterling’s value – include Microsoft, Dell, Tesla and HP.
To mitigate the impact of the latest increase, Apple is introducing new lower-price tiers.
Publishers will be able to charge users 49p or 79p for purchases but will have to re-price their products to do so.
“I don’t think many publishers will respond to that change,” commented Ben Dodson, an app consultant and developer of Music Tracker among other software.
“It’s just throwing money away and there’s no reason to give people in the UK a discount.
“I won’t be discounting my own apps.”
At present, $1 trades for 82p.
However, the price quoted by Apple in the UK version of its store includes the 20% VAT sales tax. In the US, state sales taxes are not included in advertised prices but are added at the point of sale.