September is close to Mumbai's year-round average, with average highs near 31.8°C and lows around 22.3°C (mean 27.1°C). It is a relatively wet time of year, averaging 365 mm of rainfall and 88% relative humidity across the period.
September is close to Mumbai's year-round average. Across 45 years of records, the warmest September in Mumbai was 1998 — when the month averaged 28.4°C — while the coldest was 1994 at 25.3°C. Typical September days reach 31.8°C with nights near 22.3°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.2°C | 26.5°C | 27.1°C | 27.4°C | 27.1°C | -0.1°C |
| Avg High | 32.2°C | 31.3°C | 32.0°C | 32.4°C | 31.0°C | -1.2°C |
| Avg Low | 22.2°C | 21.7°C | 22.3°C | 22.5°C | 23.3°C | +1.1°C |
| Avg Rain | 313 mm | 330 mm | 323 mm | 404 mm | 505 mm | +192 mm |
September temperatures in Mumbai have stayed relatively stable across the record.
September has ranged from a record low of 18.8°C (1994) to a record high of 34.3°C (1987).
Rainfall in September is a relatively wet time of year, averaging 365 mm, with a wettest year of 940 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
A quieter season to visit Mumbai
If your dates are flexible, the more temperate months of December and January tend to be the most comfortable for visiting Mumbai. That said, September — with days averaging 31.8°C and nights around 22.3°C (mean 27.1°C) and higher rainfall (365 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.6°C | 22.4°C | 26.0°C | 609 mm | 91% | 2.4 m/s | 3.8 |
| 2024 | 31.2°C | 23.4°C | 27.3°C | 481 mm | 90% | 2.4 m/s | 4.7 |
| 2023 | 31.3°C | 23.5°C | 27.4°C | 484 mm | 90% | 2.5 m/s | 4.3 |
| 2022 | 31.5°C | 22.9°C | 27.2°C | 521 mm | 90% | 2.2 m/s | 4.4 |
| 2021 | 29.8°C | 23.9°C | 26.9°C | 572 mm | 91% | 2.8 m/s | 4.3 |
| 2020 | 32.6°C | 23.4°C | 28.0°C | 364 mm | 90% | 1.9 m/s | 4.6 |
| 2019 🌧️ | 30.4°C | 23.7°C | 27.1°C | 940 mm | 91% | 2.9 m/s | 3.9 |
| 2018 | 33.9°C | 21.7°C | 27.8°C | 100 mm | 86% | 2 m/s | 5.4 |
| 2017 | 32.9°C | 22.6°C | 27.8°C | 472 mm | 88% | 1.9 m/s | 4.6 |
| 2016 | 30.3°C | 22.3°C | 26.3°C | 607 mm | 90% | 2.5 m/s | 4.3 |
| 2015 | 34.2°C | 20.7°C | 27.4°C | 309 mm | 85% | 2 m/s | 5.2 |
| 2014 | 33.2°C | 22.5°C | 27.9°C | 281 mm | 87% | 2.3 m/s | 4.9 |
| 2013 | 32.1°C | 23.2°C | 27.7°C | 315 mm | 89% | 2.2 m/s | 4.8 |
| 2012 | 32.7°C | 22.1°C | 27.4°C | 408 mm | 89% | 2.8 m/s | 4.9 |
| 2011 | 31.2°C | 22.9°C | 27.0°C | 348 mm | 89% | 2.6 m/s | 4.8 |
| 2010 | 32.7°C | 23.3°C | 28.0°C | 261 mm | 89% | 2.2 m/s | 5 |
| 2009 | 32.0°C | 22.2°C | 27.1°C | 277 mm | 89% | 2.1 m/s | 4.7 |
| 2008 | 31.3°C | 20.6°C | 26.0°C | 527 mm | 89% | 2.3 m/s | 4.6 |
| 2007 | 30.4°C | 23.4°C | 26.9°C | 451 mm | 90% | 2.6 m/s | 4.6 |
| 2006 | 31.2°C | 22.8°C | 27.0°C | 385 mm | 90% | 2.2 m/s | 4.8 |
| 2005 | 31.0°C | 22.0°C | 26.5°C | 776 mm | 92% | 3.4 m/s | 4 |
| 2004 | 32.7°C | 22.4°C | 27.5°C | 228 mm | 87% | 1.9 m/s | 4.8 |
| 2003 | 30.8°C | 23.1°C | 27.0°C | 233 mm | 89% | 2.5 m/s | 4.8 |
| 2002 | 34.2°C | 22.1°C | 28.2°C | 90 mm | 86% | 2 m/s | 5.4 |
| 2001 | 33.3°C | 22.4°C | 27.9°C | 156 mm | 88% | 1.9 m/s | 5.1 |
| 2000 | 32.6°C | 21.9°C | 27.2°C | 102 mm | 86% | 2 m/s | 5.4 |
| 1999 | 31.5°C | 22.8°C | 27.1°C | 329 mm | 89% | 2.4 m/s | 4.8 |
| 1998 🔥 | 33.0°C | 23.8°C | 28.4°C | 398 mm | 90% | 2.5 m/s | 4.4 |
| 1997 | 30.8°C | 21.0°C | 25.9°C | 175 mm | 87% | 2.1 m/s | 5.3 |
| 1996 | 31.4°C | 21.6°C | 26.5°C | 277 mm | 90% | 2 m/s | 4.8 |
| 1995 | 31.1°C | 22.2°C | 26.7°C | 527 mm | 89% | 2.2 m/s | 5 |
| 1994 ❄️ | 31.8°C | 18.8°C | 25.3°C | 331 mm | 86% | 2.8 m/s | 5.2 |
| 1993 | 30.4°C | 23.1°C | 26.7°C | 455 mm | 90% | 2.5 m/s | 4.7 |
| 1992 | 33.0°C | 20.6°C | 26.8°C | 354 mm | 86% | 2.5 m/s | 5.3 |
| 1991 | 30.6°C | 20.8°C | 25.7°C | 112 mm | 87% | 1.9 m/s | 5.4 |
| 1990 | 29.1°C | 22.6°C | 25.8°C | 340 mm | 90% | 2.4 m/s | 5.2 |
| 1989 | 32.7°C | 22.2°C | 27.4°C | 221 mm | 88% | 1.9 m/s | 5.2 |
| 1988 | 32.7°C | 23.3°C | 28.0°C | 728 mm | 90% | 2.4 m/s | 4.8 |
| 1987 | 34.3°C | 22.1°C | 28.2°C | 50 mm | 86% | 2 m/s | 5.3 |
| 1986 | 31.8°C | 21.6°C | 26.7°C | 66 mm | 85% | 1.7 m/s | 5.6 |
| 1985 | 32.1°C | 22.1°C | 27.1°C | 125 mm | 86% | 1.8 m/s | 5.4 |
| 1984 | 33.2°C | 20.4°C | 26.8°C | 350 mm | 87% | 2.3 m/s | 5.4 |
| 1983 | 29.7°C | 23.2°C | 26.4°C | 582 mm | 91% | 2.1 m/s | — |
| 1982 | 30.6°C | 21.6°C | 26.1°C | 265 mm | 86% | 2 m/s | — |
| 1981 | 33.1°C | 22.9°C | 28.0°C | 433 mm | 89% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 31.8°C with lows near 22.3°C (mean 27.1°C), based on 45 years of NASA POWER data.
September averages 365 mm of rainfall in Mumbai, a relatively wet time of year. The wettest on record was 940 mm in 2019.
The hottest September reached 34.3°C in 1987. The coldest dipped to 18.8°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.1°C. Daytime highs moved from 31.7°C to 30.7°C and overnight lows from 22°C to 23.2°C over the same span.
September is close to Mumbai's year-round average and a relatively wet time of year, so plan for around 31.8°C daytime highs and 22.3°C at night.
Not quite — September is the 7th coolest month in Mumbai, averaging 27.1°C.
For September in Mumbai, pack light, breathable clothing and sun protection, with typical highs of 31.8°C and lows of 22.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 88% — quite humid.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 3.4 m/s (2005).
The wettest September on record was 2019 with 940 mm. On average, September sees 365 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Mumbai behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
