Rainfall in Ernakulam (Kochi, Cochin)
Ernakulam gets 59% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 2,867 mm, 7% above average (normal).
Month-wise rainfall in Ernakulam
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 17 mm | 1% |
| February | 20 mm | 1% |
| March | 63 mm | 2% |
| April | 125 mm | 5% |
| May | 300 mm | 11% |
| June | 455 mm | 17% |
| July | 468 mm | 17% |
| August | 357 mm | 13% |
| September | 306 mm | 11% |
| October | 320 mm | 12% |
| November | 194 mm | 7% |
| December | 54 mm | 2% |
Yearly rainfall in Ernakulam since 2006
Lighter bars are dry years, 20% or more below average (2012, 2015, 2016), when wells and borewells are drawn hardest.
What Ernakulam'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 Ernakulam sheds about 2,27,630 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?
1 mm of rain on 1 m² is 1 litre. The surface factor allows for water lost to splash, evaporation and first-flush.
Frequently asked questions
What is the average annual rainfall in Ernakulam?
About 2,678 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 2006 (3,460 mm) and the driest was 2016 (1,836 mm).
Which month gets the most rain in Ernakulam?
July, with 468 mm in an average year, followed by June and August. January is the driest month (17 mm).
How much of Ernakulam's rain falls in the monsoon?
59% of a normal year's rain falls from June to September. 10 months average 50 mm or more.
How much did it rain in Ernakulam in 2025?
2,867 mm, which is 7% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Ernakulam 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 Ernakulam harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Ernakulam sheds about 2,27,630 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 Ernakulam district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.