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Rainfall · Tamil Nadu

Rainfall in Tenkasi

1,217 mmof rain in an average year, 2006–2025

Tenkasi gets 33% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 1,101 mm, 10% below average (normal).

Novemberwettest month, 226 mm on average
2006wettest year, 2,189 mm
2016driest year, 675 mm
9months a year with 50 mm of rain or more

Month-wise rainfall in Tenkasi

Average rain in each month, 2006–2025.

0100200300JanJan: 36 mmFebFeb: 11 mmMarMar: 43 mmAprApr: 73 mmMayMay: 125 mmJunJun: 101 mmJulJul: 92 mmAugAug: 96 mmSepSep: 116 mmOctOct: 219 mmNovNov: 226 mmDecDec: 79 mm
MonthAverage rainShare of the year
January36 mm3%
February11 mm1%
March43 mm4%
April73 mm6%
May125 mm10%
June101 mm8%
July92 mm8%
August96 mm8%
September116 mm10%
October219 mm18%
November226 mm19%
December79 mm6%

Yearly rainfall in Tenkasi since 2006

Lighter bars are dry years, 20% or more below average (2011, 2012, 2016, 2018), when wells and borewells are drawn hardest. The last ten years averaged 9% less rain than the ten before.

010002000300020062006: 2,189 mm2007: 1,401 mm2008: 1,424 mm20092009: 1,097 mm2010: 1,234 mm2011: 904 mm20122012: 799 mm2013: 1,045 mm2014: 1,273 mm20152015: 1,387 mm2016: 675 mm2017: 1,118 mm20182018: 949 mm2019: 1,145 mm2020: 1,075 mm20212021: 2,006 mm2022: 1,100 mm2023: 1,325 mm20242024: 1,087 mm2025: 1,101 mm- - average 1,217 mm

What Tenkasi'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 Tenkasi sheds about 1,03,445 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 year2,06,890 L≈ 21 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 TenkasiGroundwater level in Tenkasi

Frequently asked questions

What is the average annual rainfall in Tenkasi?

About 1,217 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 2006 (2,189 mm) and the driest was 2016 (675 mm).

Which month gets the most rain in Tenkasi?

November, with 226 mm in an average year, followed by October and May. February is the driest month (11 mm).

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

33% of a normal year's rain falls from June to September. 9 months average 50 mm or more.

How much did it rain in Tenkasi in 2025?

1,101 mm, which is 10% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Tenkasi increasing or decreasing?

The last 10 years averaged 9% less rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Tenkasi harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Tenkasi sheds about 1,03,445 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 Tenkasi 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