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Rainfall · Tamil Nadu

Rainfall in Thoothukudi

948 mmof rain in an average year, 2006–2025

Thoothukudi gets 22% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 894 mm, 6% below average (normal).

Novemberwettest month, 238 mm on average
2006wettest year, 1,784 mm
2016driest year, 491 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Thoothukudi

Average rain in each month, 2006–2025.

0100200300JanJan: 37 mmFebFeb: 10 mmMarMar: 37 mmAprApr: 51 mmMayMay: 74 mmJunJun: 41 mmJulJul: 41 mmAugAug: 55 mmSepSep: 74 mmOctOct: 193 mmNovNov: 238 mmDecDec: 97 mm
MonthAverage rainShare of the year
January37 mm4%
February10 mm1%
March37 mm4%
April51 mm5%
May74 mm8%
June41 mm4%
July41 mm4%
August55 mm6%
September74 mm8%
October193 mm20%
November238 mm25%
December97 mm10%

Yearly rainfall in Thoothukudi since 2006

Lighter bars are dry years, 20% or more below average (2011, 2012, 2013, 2016, 2018), when wells and borewells are drawn hardest.

050010001500200020062006: 1,784 mm2007: 862 mm2008: 1,001 mm20092009: 762 mm2010: 884 mm2011: 640 mm20122012: 599 mm2013: 652 mm2014: 940 mm20152015: 1,244 mm2016: 491 mm2017: 850 mm20182018: 699 mm2019: 1,031 mm2020: 898 mm20212021: 1,661 mm2022: 939 mm2023: 1,165 mm20242024: 972 mm2025: 894 mm- - average 948 mm

What Thoothukudi'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 Thoothukudi sheds about 80,580 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 year1,61,160 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 ThoothukudiGroundwater level in ThoothukudiPonds and lakes in ThoothukudiWater quality in Thoothukudi

Frequently asked questions

What is the average annual rainfall in Thoothukudi?

About 948 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 (1,784 mm) and the driest was 2016 (491 mm).

Which month gets the most rain in Thoothukudi?

November, with 238 mm in an average year, followed by October and December. February is the driest month (10 mm).

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

22% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Thoothukudi in 2025?

894 mm, which is 6% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Thoothukudi increasing or decreasing?

It has held roughly steady: the last 10 years averaged within 5% of the 10 before them. Year-to-year swings are much bigger than the trend.

How much rainwater can a house in Thoothukudi harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Thoothukudi sheds about 80,580 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 Thoothukudi 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