Euro zone business activity unexpectedly grew this month, a preliminary survey showed, but with much of Europe suffering a third wave of coronavirus infections and renewed lockdown measures, that may not last through April.
The PMI saw the dollar index pull back from a four-month high of 92.608 hit in early London trade, trading at the 92.454 mark around midday.
Turkey's shock weekend decision to replace its hawkish central bank governor also supported the dollar's safe-haven appeal.
Markets have been slow to catch on to the rising dollar theme in recent weeks as investors had bet that a global economic recovery would prompt buying of riskier currencies.
After falling 4% in the last quarter of 2020, the dollar has strengthened by nearly 2.5% year-to-date as investors expect the broad rise in US bond yields to weigh on stretched equity valuations and boost demand for the US currency.
The dollar index stood at 92.30 against a basket of six major currencies, up 0.4%, its highest level since late-November.
If you do see volatility the natural inclination is to take risk off the table, in this case it just basically means getting out of existing positions and the dollar shorts are extremely elevated at this point.
Short US dollar positions were last at $29.33 billion, according to data by the Commodity Futures Trading Commission.
The naira is seen easing on the spot market after it fell 0.21% to 410.29 per dollar on Thursday.
The kwacha is likely to face continued pressure against the dollar going into next week due to heightened demand for hard currency amid limited inflows.
Sterling reached its highest levels since April 2018 when it crossed $1.40 on Friday. It has risen 2.6% against the dollar in 2021 and its rapid gains have led to talk of a possible correction.
Some 17.6 million people, over a quarter of the 67 million population, have now received a first dose of a COVID-19 vaccine.
Crucially, it was the first time since early January the unit broke below the 14.50 technical resistance mark seen as a buy-target by traders.
"This is not going to change until we either get a diabolical budget from Mboweni (unlikely) or there is a global black swan event which throws us a curve ball."
The naira, which has been weakening on the over-the-counter spot and derivatives markets, dropped to a low of 403.29 naira on Thursday after reaching record intra-day lows since January.
The central bank did not agree with the need for additional exchange rate adjustment.
"Sterling is benefiting mostly from the vaccine race - it's really the main differentiator," said Ned Rumpeltin, head of European currency strategy at TD Securities.
The pound was down around 0.4% against a stronger dollar at $1.3686.
The rouble spearheaded an emerging market rally, with stocks trading near record highs on optimism over a global economic recovery thanks to steady vaccine rollouts.
The rouble was 0.3% stronger against the dollar at 74.42, its highest since Jan. 22.