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Rainfall · Tamil Nadu

Rainfall in Coimbatore

1,211 mmof rain in an average year, 2006–2025

Coimbatore gets 50% of its rain from the monsoon, June to September, and October is its wettest month. In 2025 it got 1,198 mm, 1% below average (normal).

Octoberwettest month, 185 mm on average
2021wettest year, 1,604 mm
2016driest year, 699 mm
8months a year with 50 mm of rain or more

Month-wise rainfall in Coimbatore

Average rain in each month, 2006–2025.

050100150200JanJan: 14 mmFebFeb: 9 mmMarMar: 32 mmAprApr: 57 mmMayMay: 132 mmJunJun: 154 mmJulJul: 172 mmAugAug: 151 mmSepSep: 134 mmOctOct: 185 mmNovNov: 129 mmDecDec: 42 mm
MonthAverage rainShare of the year
January14 mm1%
February9 mm1%
March32 mm3%
April57 mm5%
May132 mm11%
June154 mm13%
July172 mm14%
August151 mm12%
September134 mm11%
October185 mm15%
November129 mm11%
December42 mm3%

Yearly rainfall in Coimbatore since 2006

Lighter bars are dry years, 20% or more below average (2012, 2015, 2016), when wells and borewells are drawn hardest. The last ten years averaged 11% more rain than the ten before.

050010001500200020062006: 1,321 mm2007: 1,423 mm2008: 1,179 mm20092009: 1,112 mm2010: 1,326 mm2011: 1,177 mm20122012: 752 mm2013: 1,070 mm2014: 1,178 mm20152015: 956 mm2016: 699 mm2017: 1,218 mm20182018: 1,326 mm2019: 1,360 mm2020: 1,259 mm20212021: 1,604 mm2022: 1,520 mm2023: 1,145 mm20242024: 1,388 mm2025: 1,198 mm- - average 1,211 mm

What Coimbatore'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 Coimbatore sheds about 1,02,935 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 year2,05,870 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 CoimbatoreGroundwater level in CoimbatorePonds and lakes in CoimbatoreWater quality in Coimbatore

Frequently asked questions

What is the average annual rainfall in Coimbatore?

About 1,211 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 (1,604 mm) and the driest was 2016 (699 mm).

Which month gets the most rain in Coimbatore?

October, with 185 mm in an average year, followed by July and June. February is the driest month (9 mm).

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

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

How much did it rain in Coimbatore in 2025?

1,198 mm, which is 1% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Coimbatore 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 Coimbatore harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Coimbatore sheds about 1,02,935 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 Coimbatore 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