Rainfall in Bengaluru (Urban) (Bangalore, Bengaluru)
Bengaluru (Urban) gets 53% of its rain from the monsoon, June to September, and September is its wettest month. In 2025 it got 825 mm, 6% below average (normal).
Month-wise rainfall in Bengaluru (Urban)
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 3 mm | 0% |
| February | 5 mm | 1% |
| March | 18 mm | 2% |
| April | 44 mm | 5% |
| May | 120 mm | 14% |
| June | 87 mm | 10% |
| July | 96 mm | 11% |
| August | 140 mm | 16% |
| September | 145 mm | 17% |
| October | 128 mm | 15% |
| November | 66 mm | 8% |
| December | 24 mm | 3% |
Yearly rainfall in Bengaluru (Urban) since 2006
Lighter bars are dry years, 20% or more below average (2006, 2011, 2012, 2014, 2016, 2018), when wells and borewells are drawn hardest. The last ten years averaged 15% more rain than the ten before.
What Bengaluru (Urban)'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 Bengaluru (Urban) 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?
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 Bengaluru (Urban)?
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 2022 (1,531 mm) and the driest was 2012 (489 mm).
Which month gets the most rain in Bengaluru (Urban)?
September, with 145 mm in an average year, followed by August and October. January is the driest month (3 mm).
How much of Bengaluru (Urban)'s rain falls in the monsoon?
53% of a normal year's rain falls from June to September. 7 months average 50 mm or more.
How much did it rain in Bengaluru (Urban) in 2025?
825 mm, which is 6% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Bengaluru (Urban) increasing or decreasing?
The last 10 years averaged 15% more rain than the 10 before them. Year-to-year swings are still bigger than that change.
How much rainwater can a house in Bengaluru (Urban) harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Bengaluru (Urban) 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 Bengaluru (Urban) district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.