The Consumer Price Index (CPI) based inflation was 3.28 per cent in September.
It was 4.2 per cent in October last year. The previous high was 3.89 per cent in March this year.
As per the data released by Central Statistics Office (CSO), the October inflation for the food basket increased to 1.9 per cent. It was 1.25 per cent in September.
The rate of price rise in the vegetable segment almost doubled to 7.47 per cent as against 3.92 per cent in September.
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Inflation in pulses continued to decline and settled at (-)23.13 per cent. It was (-)22.51 per cent in September.
Fuel and light were costlier on sequential basis. Higher inflation was also noted in housing segment.
All eyes will be on the current fiscal's sixth bi-monthly meeting of the Monetary Policy Committee, headed by RBI Governor Urjit Patel, on December 5-6.
Retail inflation, a key input for RBI in setting the key interest rate, has been rising consistently since June amid a slowdown in factory output measured on Index of Industrial Production (IIP).