Mumbai records about 2422mm of rain across roughly 105 wet days a year, which is a 29% chance on an average day. July is the wettest month at 840mm (35% of the annual total) and March the driest at 0mm. Local rain type: monsoon. Critical June through September — monsoon rain is relentless and heavy. Waterproof everything: shoes, bags, phone. October through May is almost completely dry.
Chance of rain on an average day: 29%
Rainfall climatology for Mumbai. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 2422mm |
| Rain days per year | 105 |
| Odds on an average day | 29% |
| Wettest month | July — 840mm over 30 days |
| Driest month | March — 0mm over 0 days |
| Rain type | monsoon |
| Best dry window | October through May is essentially rain-free with comfortable to hot temperatures. |
| Worst rain window | July is extreme — Mumbai can receive 840mm in a single month, more than London's entire annual rainfall. |
July delivers 84000% more rain than March (840mm vs 0mm). That gap is the difference between planning around showers and ignoring them.
35% of the year's rain falls in July alone, so Mumbai has a genuine wet season rather than evenly spread showers.
Mumbai rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 30 days in July against 0 in March — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 1mm | 1 | 3% | 32°C |
| February | 1mm | 1 | 3% | 32°C |
| March | 0mm | 0 | 0% | 32°C |
| April | 1mm | 1 | 3% | 32°C |
| May | 18mm | 1 | 3% | 33°C |
| June | 530mm | 23 | 77% | 33°C |
| July | 840mm | 30 | 100% | 33°C |
| August | 585mm | 26 | 87% | 33°C |
| September | 341mm | 15 | 50% | 33°C |
| October | 64mm | 3 | 10% | 33°C |
| November | 15mm | 1 | 3% | 32°C |
| December | 5mm | 1 | 3% | 32°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Mumbai we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Mumbai records rain on roughly 105 days a year — about a 29% chance on any given day — totalling around 2422mm.
July, with about 840mm over 30 rain days. That is 35% of the entire year's rainfall in a single month.
March is the driest month at 0mm across roughly 0 days. October through May is essentially rain-free with comfortable to hot temperatures.
Critical June through September — monsoon rain is relentless and heavy. Waterproof everything: shoes, bags, phone. October through May is almost completely dry.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.