Johannesburg - South Africa's rand traded firmer against the dollar on Wednesday, touching fresh four-week highs as emerging market currencies continued to benefit from the previous day's lower than expected US inflation data.

Domestic inflation data due out at 08h00 GMT could spur the rand further if prices rose higher in June than forecast, backing the argument for interest rates to rise further this year.

At 06h47 GMT the rand was at 10.5520 versus the greenback, inching up 0.24 percent from Tuesday's session close in New York.

Government debt tracked the stronger currency, with yields for the 2026 and 2015 bonds each dipping 3.5 basis points to 8.13 percent and 6.67 percent respectively.

Economists polled by Reuters expect CPI to accelerate further above from the central bank's 3-6 percent target band, at 6.7 percent year-on-year in June.

“Anything above this and the support area of 10.5250 will come under intense pressure by those betting on a more substantial rate increase at the next South African Reserve Bank meeting,” Standard Bank trader Warrick Butler said.

“If it is a lower print then there may be some urgent questions asked about the SARB's forecasted inflation trajectory.”

The Reserve Bank raised the benchmark repo rate for the second time this year last week, citing concerns about upward risks to inflation even as the economy struggles to grow. - Reuters