Rainfall in Thane
Thane gets 93% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 3,236 mm, 21% above average (excess).
Month-wise rainfall in Thane
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 1 mm | 0% |
| February | 3 mm | 0% |
| March | 6 mm | 0% |
| April | 3 mm | 0% |
| May | 46 mm | 2% |
| June | 484 mm | 18% |
| July | 947 mm | 35% |
| August | 596 mm | 22% |
| September | 451 mm | 17% |
| October | 107 mm | 4% |
| November | 19 mm | 1% |
| December | 9 mm | 0% |
Yearly rainfall in Thane since 2006
Lighter bars are dry years, 20% or more below average (2009, 2012, 2015, 2018), when wells and borewells are drawn hardest. The last ten years averaged 16% more rain than the ten before.
What Thane'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 Thane sheds about 2,26,950 litres in an average year, most of it in four monsoon 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 Thane?
About 2,670 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 (3,345 mm) and the driest was 2015 (1,683 mm).
Which month gets the most rain in Thane?
July, with 947 mm in an average year, followed by August and June. January is the driest month (1 mm).
How much of Thane's rain falls in the monsoon?
93% of a normal year's rain falls from June to September. 5 months average 50 mm or more.
How much did it rain in Thane in 2025?
3,236 mm, which is 21% above the 2006–2025 average, or "excess" in the India Meteorological Department's terms.
Is rainfall in Thane increasing or decreasing?
The last 10 years averaged 16% more rain than the 10 before them. Year-to-year swings are still bigger than that change.
How much rainwater can a house in Thane harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Thane sheds about 2,26,950 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 Thane district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.