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Rainfall · Tamil Nadu

Rainfall in Dharmapuri

897 mmof rain in an average year, 2006–2025

Dharmapuri gets 44% of its rain from the monsoon, June to September, and October is its wettest month. In 2025 it got 773 mm, 14% below average (normal).

Octoberwettest month, 157 mm on average
2021wettest year, 1,319 mm
2016driest year, 503 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Dharmapuri

Average rain in each month, 2006–2025.

050100150200JanJan: 8 mmFebFeb: 5 mmMarMar: 20 mmAprApr: 41 mmMayMay: 114 mmJunJun: 66 mmJulJul: 82 mmAugAug: 122 mmSepSep: 125 mmOctOct: 157 mmNovNov: 112 mmDecDec: 46 mm
MonthAverage rainShare of the year
January8 mm1%
February5 mm1%
March20 mm2%
April41 mm5%
May114 mm13%
June66 mm7%
July82 mm9%
August122 mm14%
September125 mm14%
October157 mm18%
November112 mm12%
December46 mm5%

Yearly rainfall in Dharmapuri since 2006

Lighter bars are dry years, 20% or more below average (2014, 2016, 2018), when wells and borewells are drawn hardest.

05001000150020062006: 783 mm2007: 969 mm2008: 1,162 mm20092009: 739 mm2010: 1,132 mm2011: 864 mm20122012: 769 mm2013: 780 mm2014: 701 mm20152015: 883 mm2016: 503 mm2017: 926 mm20182018: 659 mm2019: 938 mm2020: 899 mm20212021: 1,319 mm2022: 1,294 mm2023: 766 mm20242024: 1,088 mm2025: 773 mm- - average 897 mm

What Dharmapuri'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 Dharmapuri sheds about 76,245 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 year1,52,490 L≈ 15 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 DharmapuriGroundwater level in DharmapuriPonds and lakes in DharmapuriWater quality in Dharmapuri

Frequently asked questions

What is the average annual rainfall in Dharmapuri?

About 897 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 (1,319 mm) and the driest was 2016 (503 mm).

Which month gets the most rain in Dharmapuri?

October, with 157 mm in an average year, followed by September and August. February is the driest month (5 mm).

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

44% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Dharmapuri in 2025?

773 mm, which is 14% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Dharmapuri 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 Dharmapuri harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Dharmapuri sheds about 76,245 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 Dharmapuri 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