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Rainfall · Tamil Nadu

Rainfall in Cuddalore

1,098 mmof rain in an average year, 2006–2025

Cuddalore gets 32% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 1,097 mm, 0% above average (normal).

Novemberwettest month, 272 mm on average
2021wettest year, 1,690 mm
2016driest year, 645 mm
8months a year with 50 mm of rain or more

Month-wise rainfall in Cuddalore

Average rain in each month, 2006–2025.

0100200300JanJan: 27 mmFebFeb: 8 mmMarMar: 22 mmAprApr: 24 mmMayMay: 70 mmJunJun: 56 mmJulJul: 72 mmAugAug: 116 mmSepSep: 109 mmOctOct: 197 mmNovNov: 272 mmDecDec: 124 mm
MonthAverage rainShare of the year
January27 mm2%
February8 mm1%
March22 mm2%
April24 mm2%
May70 mm6%
June56 mm5%
July72 mm7%
August116 mm11%
September109 mm10%
October197 mm18%
November272 mm25%
December124 mm11%

Yearly rainfall in Cuddalore since 2006

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

050010001500200020062006: 929 mm2007: 1,049 mm2008: 1,331 mm20092009: 980 mm2010: 1,312 mm2011: 1,092 mm20122012: 891 mm2013: 811 mm2014: 917 mm20152015: 1,449 mm2016: 645 mm2017: 1,123 mm20182018: 852 mm2019: 1,081 mm2020: 1,252 mm20212021: 1,690 mm2022: 1,148 mm2023: 1,000 mm20242024: 1,306 mm2025: 1,097 mm- - average 1,098 mm

What Cuddalore'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 Cuddalore sheds about 93,330 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 year1,86,660 L≈ 19 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 CuddaloreGroundwater level in CuddalorePonds and lakes in CuddaloreWater quality in Cuddalore

Frequently asked questions

What is the average annual rainfall in Cuddalore?

About 1,098 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 2021 (1,690 mm) and the driest was 2016 (645 mm).

Which month gets the most rain in Cuddalore?

November, with 272 mm in an average year, followed by October and December. February is the driest month (8 mm).

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

32% of a normal year's rain falls from June to September. 8 months average 50 mm or more.

How much did it rain in Cuddalore in 2025?

1,097 mm, which is 0% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Cuddalore 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 Cuddalore harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Cuddalore sheds about 93,330 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 Cuddalore 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