A favorable base effect seen in the previous two months is also expected to wane.
The RBI is also likely to err on the side of caution as U.S. interest rates are expected to rise by the end of this year for the first time since 2006, potentially putting pressure on emerging market currencies, including the rupee.
RBI Governor Raghuram Rajan is expected to express that cautiousness as he looks to manage expectations, and counterbalance the calls for aggressive easing from government officials and corporate executives.
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"I expect the RBI to cut the repo rate and sound a cautionary tone on the deficient monsoon's impact on food prices and the Fed," Soumya Kanti Ghosh, chief economic adviser at State Bank of India, said.
Expectations for a rate cut surged the release of data showing consumer inflation at a record low of 3.66 percent in August. Inflation looks set to undershoot the government's projection of 6 percent inflation by January 2016.
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The economy expanded at a slower-than-expected annualized rate of 7 percent in the April-June quarter. That is faster than China, but well below the government's target of 8 to 8.5 percent for the year ending in March.
The stuttering recovery in the growth rate lies behind the calls for the central bank to lower interest rates, but the RBI is worried about the potential for inflation to flare up again.
Rajan this month pointed out that without a favorable base effect, August inflation would have been around "mid five percent."
Looking ahead, analysts expect Rajan set a new target to bring consumer inflation down to 5 percent by January 2017, as part of his longer-term objective to keep inflation at around 4 percent.