Does a Below-Normal Monsoon Mean Less Rain Everywhere in India?

An all-India rainfall deficit and a normal-to-wetter outlook for selected regions can both be true. That is the key to reading India’s monsoon numbers without turning one headline into a forecast for the whole country.

No—the headline is not a forecast for every place

The India Meteorological Department’s September 2026 outlook placed rainfall for India as a whole below 91% of the Long Period Average (LPA). For September, the LPA is 167.9 mm, calculated from the 1971–2020 reference period.

But the same outlook expected normal to above-normal rainfall in parts of northwest, northeast, east, east-central and southeast peninsular India. “Below normal”, therefore, describes the national category against a reference—not identical conditions in every state or region.

The observed number answers a different question

The IMD’s extended-range bulletin for 17–30 September reported that cumulative rainfall from 1 June to 16 September was 682.0 mm, compared with a normal 801.5 mm. That was 15% below the LPA.

The preceding week, 10–16 September, was also 17% below normal across India. These figures describe rainfall already observed up to a stated cut-off. They are not a promise that the rest of September will follow exactly the same pattern.

Why the time window matters

The same bulletin divided its forward-looking view into two periods. Rainfall for 17–23 September was forecast to be below normal over the country as a whole. For 24–30 September, rainfall was expected to be near normal overall, with normal to above-normal activity over eastern, adjoining central and peninsular India during the first half of that week, while much of the remaining country was expected to stay below normal.

That is why a national seasonal figure can feel disconnected from local weather. The figure may cover the whole country and several months, while the useful question may concern one region and one week. Both descriptions can be accurate because they measure different slices of the same monsoon.

For readers, three details should stay attached to every rainfall percentage: where it applies, which dates it covers, and whether it is observed or forecast. Remove any one of those, and the number becomes easier to overread.

So, does a below-normal monsoon mean less rain everywhere in India? No. It means the national rainfall comparison is running below its reference level. The regional and time-window details are what show whether that broad picture also applies to a particular part of the country.