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Rainfall · Tamil Nadu

Rainfall in Tiruchirappalli

876 mmof rain in an average year, 2006–2025

Tiruchirappalli gets 35% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 880 mm, 0% above average (normal).

Novemberwettest month, 178 mm on average
2021wettest year, 1,352 mm
2016driest year, 477 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Tiruchirappalli

Average rain in each month, 2006–2025.

050100150200JanJan: 19 mmFebFeb: 7 mmMarMar: 19 mmAprApr: 31 mmMayMay: 79 mmJunJun: 49 mmJulJul: 58 mmAugAug: 100 mmSepSep: 100 mmOctOct: 158 mmNovNov: 178 mmDecDec: 79 mm
MonthAverage rainShare of the year
January19 mm2%
February7 mm1%
March19 mm2%
April31 mm4%
May79 mm9%
June49 mm6%
July58 mm7%
August100 mm11%
September100 mm11%
October158 mm18%
November178 mm20%
December79 mm9%

Yearly rainfall in Tiruchirappalli since 2006

Lighter bars are dry years, 20% or more below average (2009, 2013, 2014, 2016), when wells and borewells are drawn hardest. The last ten years averaged 7% more rain than the ten before.

05001000150020062006: 768 mm2007: 817 mm2008: 1,090 mm20092009: 670 mm2010: 1,048 mm2011: 876 mm20122012: 722 mm2013: 648 mm2014: 699 mm20152015: 1,125 mm2016: 477 mm2017: 831 mm20182018: 704 mm2019: 864 mm2020: 969 mm20212021: 1,352 mm2022: 1,035 mm2023: 841 mm20242024: 1,099 mm2025: 880 mm- - average 876 mm

What Tiruchirappalli'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 Tiruchirappalli sheds about 74,460 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 year1,48,920 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 TiruchirappalliGroundwater level in TiruchirappalliPonds and lakes in TiruchirappalliWater quality in Tiruchirappalli

Frequently asked questions

What is the average annual rainfall in Tiruchirappalli?

About 876 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 (1,352 mm) and the driest was 2016 (477 mm).

Which month gets the most rain in Tiruchirappalli?

November, with 178 mm in an average year, followed by October and August. February is the driest month (7 mm).

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

35% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Tiruchirappalli in 2025?

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

Is rainfall in Tiruchirappalli increasing or decreasing?

The last 10 years averaged 7% more rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Tiruchirappalli harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Tiruchirappalli sheds about 74,460 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 Tiruchirappalli 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