September is one of the cooler months of the year in Mumbai, with average highs near 29°C and lows around 23.8°C (mean 26.4°C). It is a relatively wet time of year, averaging 365 mm of rainfall and 88% relative humidity across the period.
September is one of the cooler months of the year in Mumbai. Across 45 years of records, the warmest Septembers in Mumbai were 1987 and 2017 — when the month averaged 27.1°C — while the coldest was 1994 at 25.3°C. Typical September days reach 29°C with nights near 23.8°C. The long-term September temperature trend is broadly flat.
September is a relatively wet time of year in Mumbai, averaging 365 mm of rainfall. The wettest September on record was 2019 with 940 mm, while the driest was 1987 at 50 mm.
Relative humidity in Mumbai during September averages 88%. The most humid September was 2005 at 92%, and the least humid was 2015 at 85%.
September receives about 4.9 kWh/m²/day of solar energy in Mumbai. The sunniest September was 1986 at 5.6 kWh/m²/day, and the cloudiest was 2025 at 3.8.
Average wind speed in Mumbai during September is 2.3 m/s. The windiest September was 2005 at 3.4 m/s, while the calmest was 1986 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.3°C | 26.1°C | 26.6°C | 26.6°C | 26.6°C | +0.3°C |
| Avg High | 29.1°C | 28.7°C | 29.2°C | 29.3°C | 28.8°C | -0.3°C |
| Avg Low | 23.6°C | 23.4°C | 23.9°C | 23.9°C | 24.4°C | +0.8°C |
| Avg Rain | 313 mm | 330 mm | 323 mm | 404 mm | 505 mm | +192 mm |
September temperatures in Mumbai have risen by about 0.5°C between 1981–1985 and 2021–2025.
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 rose about 0°C per decade while lows rose 0.2°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 29°C and nights around 23.8°C (mean 26.4°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 | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.3°C | 26.1°C | 24.0°C | 29.6°C | 22.4°C | 609 mm | 91% | 2.4 m/s | 3.8 |
| 2024 | 29.0°C | 26.8°C | 24.5°C | 31.2°C | 23.4°C | 481 mm | 90% | 2.4 m/s | 4.7 |
| 2023 | 29.2°C | 27.0°C | 24.7°C | 31.3°C | 23.5°C | 484 mm | 90% | 2.5 m/s | 4.3 |
| 2022 | 28.9°C | 26.5°C | 24.2°C | 31.5°C | 22.9°C | 521 mm | 90% | 2.2 m/s | 4.4 |
| 2021 | 28.4°C | 26.5°C | 24.6°C | 29.8°C | 23.9°C | 572 mm | 91% | 2.8 m/s | 4.3 |
| 2020 | 29.1°C | 26.8°C | 24.6°C | 32.6°C | 23.4°C | 364 mm | 90% | 1.9 m/s | 4.6 |
| 2019 🌧️ | 28.7°C | 26.7°C | 24.6°C | 30.4°C | 23.7°C | 940 mm | 91% | 2.9 m/s | 3.9 |
| 2018 | 29.8°C | 26.5°C | 23.1°C | 33.9°C | 21.7°C | 100 mm | 86% | 2 m/s | 5.4 |
| 2017 | 29.9°C | 27.1°C | 24.2°C | 32.9°C | 22.6°C | 472 mm | 88% | 1.9 m/s | 4.6 |
| 2016 | 28.3°C | 26.0°C | 23.8°C | 30.3°C | 22.3°C | 607 mm | 90% | 2.5 m/s | 4.3 |
| 2015 | 30.3°C | 27.0°C | 23.7°C | 34.2°C | 20.7°C | 309 mm | 85% | 2 m/s | 5.2 |
| 2014 | 29.3°C | 26.5°C | 23.7°C | 33.2°C | 22.5°C | 281 mm | 87% | 2.3 m/s | 4.9 |
| 2013 | 29.2°C | 26.7°C | 24.2°C | 32.1°C | 23.2°C | 315 mm | 89% | 2.2 m/s | 4.8 |
| 2012 | 28.8°C | 26.3°C | 23.9°C | 32.7°C | 22.1°C | 408 mm | 89% | 2.8 m/s | 4.9 |
| 2011 | 28.8°C | 26.3°C | 23.9°C | 31.2°C | 22.9°C | 348 mm | 89% | 2.6 m/s | 4.8 |
| 2010 | 29.4°C | 26.9°C | 24.4°C | 32.7°C | 23.3°C | 261 mm | 89% | 2.2 m/s | 5 |
| 2009 | 29.9°C | 27.0°C | 24.1°C | 32.0°C | 22.2°C | 277 mm | 89% | 2.1 m/s | 4.7 |
| 2008 | 29.0°C | 26.4°C | 23.7°C | 31.3°C | 20.6°C | 527 mm | 89% | 2.3 m/s | 4.6 |
| 2007 | 28.9°C | 26.8°C | 24.6°C | 30.4°C | 23.4°C | 451 mm | 90% | 2.6 m/s | 4.6 |
| 2006 | 28.9°C | 26.5°C | 24.0°C | 31.2°C | 22.8°C | 385 mm | 90% | 2.2 m/s | 4.8 |
| 2005 | 28.0°C | 26.2°C | 24.3°C | 31.0°C | 22.0°C | 776 mm | 92% | 3.4 m/s | 4 |
| 2004 | 29.7°C | 26.9°C | 24.0°C | 32.7°C | 22.4°C | 228 mm | 87% | 1.9 m/s | 4.8 |
| 2003 | 28.8°C | 26.3°C | 23.9°C | 30.8°C | 23.1°C | 233 mm | 89% | 2.5 m/s | 4.8 |
| 2002 | 29.3°C | 26.3°C | 23.4°C | 34.2°C | 22.1°C | 90 mm | 86% | 2 m/s | 5.4 |
| 2001 | 29.6°C | 26.6°C | 23.7°C | 33.3°C | 22.4°C | 156 mm | 88% | 1.9 m/s | 5.1 |
| 2000 | 29.9°C | 26.7°C | 23.5°C | 32.6°C | 21.9°C | 102 mm | 86% | 2 m/s | 5.4 |
| 1999 | 28.6°C | 26.2°C | 23.7°C | 31.5°C | 22.8°C | 329 mm | 89% | 2.4 m/s | 4.8 |
| 1998 | 29.2°C | 26.9°C | 24.7°C | 33.0°C | 23.8°C | 398 mm | 90% | 2.5 m/s | 4.4 |
| 1997 | 28.7°C | 26.1°C | 23.4°C | 30.8°C | 21.0°C | 175 mm | 87% | 2.1 m/s | 5.3 |
| 1996 | 28.4°C | 25.8°C | 23.3°C | 31.4°C | 21.6°C | 277 mm | 90% | 2 m/s | 4.8 |
| 1995 | 28.9°C | 26.3°C | 23.8°C | 31.1°C | 22.2°C | 527 mm | 89% | 2.2 m/s | 5 |
| 1994 ❄️ | 28.3°C | 25.3°C | 22.4°C | 31.8°C | 18.8°C | 331 mm | 86% | 2.8 m/s | 5.2 |
| 1993 | 28.4°C | 26.1°C | 23.7°C | 30.4°C | 23.1°C | 455 mm | 90% | 2.5 m/s | 4.7 |
| 1992 | 29.3°C | 26.2°C | 23.1°C | 33.0°C | 20.6°C | 354 mm | 86% | 2.5 m/s | 5.3 |
| 1991 | 29.0°C | 25.9°C | 22.9°C | 30.6°C | 20.8°C | 112 mm | 87% | 1.9 m/s | 5.4 |
| 1990 | 28.1°C | 25.8°C | 23.4°C | 29.1°C | 22.6°C | 340 mm | 90% | 2.4 m/s | 5.2 |
| 1989 | 28.9°C | 26.2°C | 23.5°C | 32.7°C | 22.2°C | 221 mm | 88% | 1.9 m/s | 5.2 |
| 1988 | 29.4°C | 27.0°C | 24.7°C | 32.7°C | 23.3°C | 728 mm | 90% | 2.4 m/s | 4.8 |
| 1987 🔥 | 30.1°C | 27.1°C | 24.1°C | 34.3°C | 22.1°C | 50 mm | 86% | 2 m/s | 5.3 |
| 1986 | 29.1°C | 25.9°C | 22.8°C | 31.8°C | 21.6°C | 66 mm | 85% | 1.7 m/s | 5.6 |
| 1985 | 29.0°C | 26.0°C | 23.0°C | 32.1°C | 22.1°C | 125 mm | 86% | 1.8 m/s | 5.4 |
| 1984 | 28.8°C | 25.7°C | 22.7°C | 33.2°C | 20.4°C | 350 mm | 87% | 2.3 m/s | 5.4 |
| 1983 | 28.4°C | 26.2°C | 24.1°C | 29.7°C | 23.2°C | 582 mm | 91% | 2.1 m/s | — |
| 1982 | 28.9°C | 26.0°C | 23.1°C | 30.6°C | 21.6°C | 265 mm | 86% | 2 m/s | — |
| 1981 | 29.1°C | 26.6°C | 24.1°C | 33.1°C | 22.9°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 29°C with lows near 23.8°C (mean 26.4°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 0.5°C. Daytime highs moved from 28.8°C to 28.8°C and overnight lows from 23.4°C to 24.4°C over the same span.
September is one of the cooler months of the year in Mumbai and a relatively wet time of year, so plan for around 29°C daytime highs and 23.8°C at night.
Not quite — September is the 5th coolest month in Mumbai, averaging 26.4°C.
For September in Mumbai, pack light layers you can adjust through the day, with typical highs of 29°C and lows of 23.8°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.
