* UK August CPI at 1.7% vs forecast of 1.9%
* Pound falls 0.3% to $1.2457
* EU's Juncker warns on no-deal Brexit risk despite optimism
* Graphic: World FX rates in 2019 http://tmsnrt.rs/2egbfVh
* Graphic: Trade-weighted sterling since Brexit vote http://tmsnrt.rs/2hwV9Hv (Recasts after inflation data, adds quote)
LONDON, Sept 18 (Reuters) - Sterling fell on Wednesday after British prices in August grew at a their slowest pace since late 2016, while concerns about whether a last-minute Brexit deal was achievable also weighed on the currency.
Prices of goods and services paid by consumers rose at an annual rate of 1.7% in August after a 2.1% increase in July, official data showed. A Reuters poll of economists had expected a rate of 1.9%.
The lower-than-forecast rate will be a welcome boost for British consumers and comes ahead of the Bank of England's monetary policy meeting on Thursday. The BoE targets a 2% inflation rate.
"While the data will likely cause a knee-jerk sell-off in sterling and stoke some volatility, market focus and long-term direction will continue to be driven by parliamentary and Brexit developments," said Sam Cooper at Silicon Valley Bank.
The pound fell 0.3% to $1.2457 from trading around $1.2480 before the inflation data was released.sonos sonos One (Gen 2) - Voice Controlled Smart Speaker with Amazon Alexa Built-in - Black read more
That followed a rally to a six-week high on Tuesday of $1.2528 on the back of optimism that Prime Minister Boris Johnson was trying to secure a Brexit deal with the European Union before the Oct. 31 deadline.
"The pound continues to benefit from building optimism over the potential for a last-minute Brexit deal and more likely a short Article 50 extension which have both helped ease more immediate no-deal Brexit risks," MUFG analysts said in a research note sent to clients.
Investors have been reassured by British lawmakers voting to block a no-deal Brexit on Oct. 31, helping sterling to rally strongly over the past week. But there was some caution on Wednesday as European Commission President Jean-Claude Juncker said the risk of a no-deal divorce was "very real".
Against the euro sterling was unchanged at 88.585 pence .
The BoE is expected to keep interest rates at 0.75% on Thursday when it meets. Policymakers have said rates could rise or fall in the event of a no-deal Brexit.
The Financial Times reported that the appointment of Governor Mark Carney's successor was set to be pushed back until after a forthcoming election, which Johnson wants to call. (Reporting by Tommy Wilkes; Editing by Angus MacSwan and Pravin Char)
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