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Rainfall · Tamil Nadu

Rainfall in Erode

787 mmof rain in an average year, 2006–2025

Erode gets 40% of its rain from the monsoon, June to September, and October is its wettest month. In 2025 it got 741 mm, 6% below average (normal).

Octoberwettest month, 146 mm on average
2021wettest year, 1,240 mm
2016driest year, 426 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Erode

Average rain in each month, 2006–2025.

050100150200JanJan: 9 mmFebFeb: 5 mmMarMar: 20 mmAprApr: 41 mmMayMay: 99 mmJunJun: 55 mmJulJul: 66 mmAugAug: 93 mmSepSep: 102 mmOctOct: 146 mmNovNov: 110 mmDecDec: 41 mm
MonthAverage rainShare of the year
January9 mm1%
February5 mm1%
March20 mm3%
April41 mm5%
May99 mm13%
June55 mm7%
July66 mm8%
August93 mm12%
September102 mm13%
October146 mm19%
November110 mm14%
December41 mm5%

Yearly rainfall in Erode since 2006

Lighter bars are dry years, 20% or more below average (2009, 2012, 2013, 2014, 2016), when wells and borewells are drawn hardest. The last ten years averaged 20% more rain than the ten before.

05001000150020062006: 665 mm2007: 769 mm2008: 865 mm20092009: 559 mm2010: 908 mm2011: 739 mm20122012: 561 mm2013: 603 mm2014: 604 mm20152015: 884 mm2016: 426 mm2017: 838 mm20182018: 693 mm2019: 878 mm2020: 859 mm20212021: 1,240 mm2022: 1,041 mm2023: 780 mm20242024: 1,087 mm2025: 741 mm- - average 787 mm

What Erode'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 Erode sheds about 66,895 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 year1,33,790 L≈ 13 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 ErodeGroundwater level in ErodePonds and lakes in ErodeWater quality in Erode

Frequently asked questions

What is the average annual rainfall in Erode?

About 787 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 (1,240 mm) and the driest was 2016 (426 mm).

Which month gets the most rain in Erode?

October, with 146 mm in an average year, followed by November and September. February is the driest month (5 mm).

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

40% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Erode in 2025?

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

Is rainfall in Erode increasing or decreasing?

The last 10 years averaged 20% more rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Erode harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Erode sheds about 66,895 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 Erode 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