Mumbai is 1°C (1.8°F) warmer by day, Mumbai has 1.4°C (2.5°F) warmer nights, Mumbai gets 830 mm (32.7 in) more rain a year.
Kolkata is at its warmest in April and coolest in January, while Mumbai peaks in April and bottoms out in January. Month for month, Kolkata is the warmer of the two in 6 of 12 months.
Mumbai is the wetter of the two, collecting 2,354 mm (92.7 in) of rain a year against 1,524 mm (60 in) in Kolkata. The most comfortable time to visit is January, February and November in Kolkata and January, November and December in Mumbai.
| Kolkata | Metric | Mumbai |
|---|---|---|
| 🌡️ Temperature | ||
| 34.7°C | 🌡️Average daytime high | 35.7°C |
| 18°C | 🌙Average nighttime low | 19.4°C |
| April | 🔥Hottest month | April |
| January | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 1,524 mm | 🌧️Annual rainfall | 2,354 mm |
| July | ☔Wettest month | July |
| December | 🏜️Driest month | January |
| 💨 Climate | ||
| 72% | 💧Average humidity | 67% |
| 2.3 m/s | 💨Average wind speed | 2.6 m/s |
Overnight, Kolkata typically falls to around 18°C (64.4°F) while Mumbai settles near 19.4°C (66.9°F).
Kolkata is hottest in April and coldest in January, whereas Mumbai peaks in April and is coolest in January.
Kolkata sees the most rain in July and the least in December; Mumbai is wettest in July and driest in January.
Kolkata feels the more humid of the two, averaging 72% relative humidity against 67%.
For Mumbai, the pick of the year is January, November and December.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Kolkata | Mumbai | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 6.9 | 18 | 29.2 | 12.7 | 24.1 | 35.5 |
| February | 9.9 | 22.2 | 34.5 | 14.5 | 26.7 | 38.9 |
| March | 15.2 | 27.6 | 39.9 | 17.8 | 30 | 42.3 |
| April | 21.8 | 32.3 | 42.8 | 20.9 | 32 | 43 |
| May | 24.7 | 33.5🔥 | 42.2 | 24 | 32.7🔥 | 41.5 |
| June | 25.8 | 32.3 | 38.8 | 24.8 | 30.9 | 36.9 |
| July | 25.4 | 29.7 | 33.9 | 24.1 | 27.3 | 30.4 |
| August | 25.1 | 28.9 | 32.8 | 23.4 | 26.5 | 29.6 |
| September | 23.7 | 28.1 | 32.5 | 22.3 | 27.1 | 31.8 |
| October | 17.5 | 24.7 | 32 | 18.4 | 25.8 | 33.3 |
| November | 12 | 21.1 | 30.1 | 15.8 | 24.3 | 32.7 |
| December | 7.6 | 17.6❄️ | 27.6 | 13.6 | 23.3❄️ | 33.1 |
| Annual Avg | 18 | 26.3 | 34.7 | 19.4 | 27.6 | 35.8 |
Min / mean / max temperature (°C). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Kolkata and Mumbai feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Kolkata Mumbai
See how Kolkata and Mumbai stack up against other cities. Swipe for more.
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Kolkata and Mumbai — each drawn straight from the climate figures above.
Mumbai is the warmer of the two. It averages daytime highs of 35.7°C (96.3°F) against 34.7°C (94.5°F) in Kolkata — roughly 1°C (1.8°F) warmer by day. Nights are milder in Mumbai, with average lows of 19.4°C (66.9°F) versus 18°C (64.4°F).
Kolkata is hottest in April, averaging highs of about 42.8°C (109.1°F), while Mumbai peaks in April at around 43°C (109.5°F). That makes Mumbai the hotter of the two at the height of summer.
Kolkata gets colder. In its coldest month (January) overnight lows average about 6.9°C (44.3°F), compared with 12.7°C (54.8°F) at the low point of the year in Mumbai.
Mumbai is the wetter city, collecting about 2,354 mm (92.7 in) of rain a year versus 1,524 mm (60 in) in Kolkata. Kolkata is wettest in July and driest in December; Mumbai is wettest in July and driest in January.
Kolkata is the more humid of the two, averaging 72% relative humidity over the year against 67% in Mumbai.
The most comfortable months in Kolkata are January, February and November, when average temperatures are at their mildest.
Mumbai is at its most pleasant around January, November and December, based on the mildest average temperatures of the year.
Kolkata is the warmer city in 6 of the 12 months of the year. The gap is widest in January, about 6.1°C (11°F), and narrowest in April, about 0.3°C (0.5°F).
Kolkata has the bigger seasonal swing, about 15.9°C (28.6°F) between its coldest and hottest months versus 9.4°C (16.9°F) in Mumbai — so Mumbai has the steadier, more even climate.
It depends what matters most to you: choose Mumbai for warmer weather, pick Kolkata if you prefer drier conditions and go for Mumbai if you want lower humidity. There is no single "better" climate — it comes down to whether you value warmth, dryness or comfort most.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Kolkata and Mumbai, not a single year's weather or a short-range forecast.
