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Rainfall · Tamil Nadu

Rainfall in Vellore

925 mmof rain in an average year, 2006–2025

Vellore gets 51% of its rain from the monsoon, June to September, and September is its wettest month. In 2025 it got 924 mm, 0% above average (normal).

Septemberwettest month, 143 mm on average
2022wettest year, 1,323 mm
2018driest year, 598 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Vellore

Average rain in each month, 2006–2025.

050100150200JanJan: 7 mmFebFeb: 5 mmMarMar: 18 mmAprApr: 35 mmMayMay: 97 mmJunJun: 87 mmJulJul: 102 mmAugAug: 140 mmSepSep: 143 mmOctOct: 136 mmNovNov: 111 mmDecDec: 44 mm
MonthAverage rainShare of the year
January7 mm1%
February5 mm1%
March18 mm2%
April35 mm4%
May97 mm10%
June87 mm9%
July102 mm11%
August140 mm15%
September143 mm15%
October136 mm15%
November111 mm12%
December44 mm5%

Yearly rainfall in Vellore since 2006

Lighter bars are dry years, 20% or more below average (2006, 2011, 2012, 2014, 2016, 2018), when wells and borewells are drawn hardest. The last ten years averaged 11% more rain than the ten before.

05001000150020062006: 728 mm2007: 1,077 mm2008: 1,142 mm20092009: 861 mm2010: 1,006 mm2011: 726 mm20122012: 615 mm2013: 858 mm2014: 623 mm20152015: 1,124 mm2016: 618 mm2017: 1,066 mm20182018: 598 mm2019: 841 mm2020: 1,145 mm20212021: 1,278 mm2022: 1,323 mm2023: 883 mm20242024: 1,058 mm2025: 924 mm- - average 925 mm

What Vellore's rain is worth to a building

Every millimetre of rain on a square metre of roof is a litre of water. A 100 m² roof in Vellore sheds about 78,625 litres in an average year, most of it in a few wet months. Sent into a recharge pit, it refills the ground instead of flooding the street.

Your building: how much can you recharge?

Water you can put back each year1,57,250 L≈ 16 water tankers of 10,000 L

1 mm of rain on 1 m² is 1 litre. The surface factor allows for water lost to splash, evaporation and first-flush.

Rainwater harvesting cost in VelloreGroundwater level in VelloreWater quality in Vellore

Frequently asked questions

What is the average annual rainfall in Vellore?

About 925 mm a year, averaged over 2006–2025 from NASA POWER satellite and weather-model data for the centre of the district. The wettest year in that time was 2022 (1,323 mm) and the driest was 2018 (598 mm).

Which month gets the most rain in Vellore?

September, with 143 mm in an average year, followed by August and October. February is the driest month (5 mm).

How much of Vellore's rain falls in the monsoon?

51% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Vellore in 2025?

924 mm, which is 0% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Vellore increasing or decreasing?

The last 10 years averaged 11% more rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Vellore harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Vellore sheds about 78,625 litres in an average year: area × rainfall × 0.85 for splash and evaporation. Sent into a recharge pit, that refills the ground under the house instead of running into the drain.

Rainfall from NASA POWER (bias-corrected satellite and weather-model rainfall) at the centre of Vellore district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.

Rainfall in other districts of Tamil Nadu