September is one of the warmer months of the year in Kolkata, with average highs near 30.5°C and lows around 25.4°C (mean 28°C). It is a relatively wet time of year, averaging 258 mm of rainfall and 89% relative humidity across the period.
September is one of the warmer months of the year in Kolkata. Across 45 years of records, the warmest September in Kolkata was 2023 — when the month averaged 28.6°C — while the coldest was 1984 at 27.3°C. Typical September days reach 30.5°C with nights near 25.4°C. The long-term September temperature trend is broadly flat.
September is a relatively wet time of year in Kolkata, averaging 258 mm of rainfall. The wettest September on record was 2021 with 580 mm, while the driest was 1984 at 100 mm.
Relative humidity in Kolkata during September averages 89%. The most humid September was 1999 at 92%, and the least humid was 1982 at 86%.
September receives about 4.3 kWh/m²/day of solar energy in Kolkata. The sunniest September was 1994 at 5 kWh/m²/day, and the cloudiest were 2021 and 2023 at 3.7.
Average wind speed in Kolkata during September is 2 m/s. The windiest Septembers were 1983, 1987 and 2004 at 2.5 m/s, while the calmest was 2015 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.0°C | 27.7°C | 27.8°C | 28.2°C | 28.4°C | +0.4°C |
| Avg High | 30.8°C | 30.2°C | 30.2°C | 30.8°C | 30.8°C | 0°C |
| Avg Low | 25.2°C | 25.2°C | 25.4°C | 25.5°C | 26.0°C | +0.8°C |
| Avg Rain | 206 mm | 259 mm | 271 mm | 252 mm | 324 mm | +118 mm |
September temperatures in Kolkata have risen by about 0.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 19.2°C (1994) to a record high of 33.7°C (2017).
Rainfall in September is a relatively wet time of year, averaging 258 mm, with a wettest year of 580 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 good time to visit Kolkata
September is a good time to visit Kolkata, with days averaging 30.5°C and nights around 25.4°C (mean 28°C, warmer than Kolkata's yearly average) and higher rainfall. November and February are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.8°C | 28.3°C | 25.8°C | 32.3°C | 24.8°C | 248 mm | 89% | 1.7 m/s | 4.4 |
| 2024 | 30.8°C | 28.5°C | 26.3°C | 32.5°C | 24.9°C | 403 mm | 90% | 2.2 m/s | 4.2 |
| 2023 🔥 | 31.0°C | 28.6°C | 26.2°C | 33.0°C | 25.4°C | 318 mm | 90% | 1.9 m/s | 3.7 |
| 2022 | 30.7°C | 28.3°C | 25.8°C | 32.1°C | 25.1°C | 245 mm | 89% | 2 m/s | 4.2 |
| 2021 🌧️ | 30.3°C | 27.9°C | 25.6°C | 32.1°C | 24.8°C | 580 mm | 90% | 2 m/s | 3.7 |
| 2020 | 30.9°C | 28.5°C | 26.1°C | 32.9°C | 24.7°C | 149 mm | 89% | 1.8 m/s | 4.2 |
| 2019 | 30.7°C | 28.2°C | 25.7°C | 32.9°C | 23.5°C | 320 mm | 89% | 2 m/s | 4 |
| 2018 | 31.0°C | 28.3°C | 25.6°C | 32.6°C | 23.9°C | 216 mm | 88% | 1.8 m/s | 4.5 |
| 2017 | 30.9°C | 28.4°C | 25.9°C | 33.7°C | 24.8°C | 226 mm | 89% | 1.7 m/s | 4.3 |
| 2016 | 30.8°C | 28.2°C | 25.5°C | 31.9°C | 24.8°C | 245 mm | 89% | 1.8 m/s | 4.4 |
| 2015 | 31.3°C | 28.3°C | 25.3°C | 33.2°C | 22.9°C | 204 mm | 86% | 1.6 m/s | 4.4 |
| 2014 | 31.1°C | 28.2°C | 25.3°C | 33.0°C | 22.2°C | 219 mm | 87% | 2 m/s | 4.7 |
| 2013 | 30.6°C | 28.1°C | 25.7°C | 32.9°C | 25.0°C | 272 mm | 90% | 1.7 m/s | 4.3 |
| 2012 | 30.5°C | 27.9°C | 25.3°C | 32.1°C | 21.9°C | 227 mm | 89% | 2.1 m/s | 4.5 |
| 2011 | 30.1°C | 27.8°C | 25.5°C | 32.6°C | 23.1°C | 290 mm | 91% | 2.4 m/s | 4 |
| 2010 | 30.7°C | 28.1°C | 25.4°C | 32.2°C | 22.9°C | 305 mm | 88% | 1.8 m/s | 4.5 |
| 2009 | 30.4°C | 28.0°C | 25.5°C | 32.5°C | 24.9°C | 347 mm | 90% | 1.8 m/s | 4.5 |
| 2008 | 29.9°C | 27.5°C | 25.1°C | 31.9°C | 22.9°C | 267 mm | 90% | 2 m/s | 4.5 |
| 2007 | 30.0°C | 27.8°C | 25.6°C | 31.7°C | 24.0°C | 485 mm | 92% | 2.2 m/s | 3.9 |
| 2006 | 30.1°C | 27.7°C | 25.4°C | 32.9°C | 24.1°C | 376 mm | 90% | 2.1 m/s | 4.3 |
| 2005 | 30.1°C | 27.9°C | 25.6°C | 33.0°C | 24.7°C | 175 mm | 90% | 2.1 m/s | 4.6 |
| 2004 | 29.9°C | 27.6°C | 25.3°C | 32.2°C | 23.3°C | 295 mm | 91% | 2.5 m/s | 4.2 |
| 2003 | 30.6°C | 28.2°C | 25.7°C | 32.4°C | 24.7°C | 143 mm | 90% | 2 m/s | 4.3 |
| 2002 | 30.0°C | 27.6°C | 25.1°C | 32.7°C | 24.3°C | 210 mm | 90% | 2 m/s | 4.3 |
| 2001 | 30.6°C | 28.0°C | 25.4°C | 32.6°C | 23.7°C | 203 mm | 89% | 1.7 m/s | 4.6 |
| 2000 | 30.1°C | 27.7°C | 25.3°C | 31.9°C | 21.8°C | 206 mm | 90% | 2.3 m/s | 4.1 |
| 1999 | 29.7°C | 27.5°C | 25.4°C | 31.8°C | 23.9°C | 481 mm | 92% | 2.3 m/s | 3.8 |
| 1998 | 30.3°C | 27.9°C | 25.6°C | 32.4°C | 24.7°C | 248 mm | 90% | 1.8 m/s | 4.4 |
| 1997 | 30.1°C | 27.6°C | 25.1°C | 31.9°C | 23.0°C | 187 mm | 90% | 1.9 m/s | 4.1 |
| 1996 | 30.7°C | 27.9°C | 25.2°C | 32.9°C | 24.0°C | 101 mm | 88% | 1.7 m/s | 4.7 |
| 1995 | 30.0°C | 27.8°C | 25.6°C | 32.2°C | 24.1°C | 393 mm | 91% | 2.2 m/s | 3.8 |
| 1994 | 30.6°C | 27.4°C | 24.2°C | 31.8°C | 19.2°C | 110 mm | 86% | 2.1 m/s | 5 |
| 1993 | 29.5°C | 27.4°C | 25.2°C | 32.4°C | 24.3°C | 328 mm | 91% | 2.4 m/s | 3.8 |
| 1992 | 30.8°C | 27.7°C | 24.7°C | 33.1°C | 22.9°C | 204 mm | 87% | 2.2 m/s | 4.6 |
| 1991 | 30.4°C | 27.9°C | 25.4°C | 32.3°C | 23.0°C | 218 mm | 89% | 1.9 m/s | 4.2 |
| 1990 | 30.3°C | 27.9°C | 25.5°C | 31.6°C | 24.4°C | 317 mm | 90% | 2.2 m/s | 4.1 |
| 1989 | 30.7°C | 28.0°C | 25.4°C | 32.5°C | 23.6°C | 218 mm | 89% | 2.2 m/s | 4.1 |
| 1988 | 30.7°C | 28.2°C | 25.6°C | 32.9°C | 24.7°C | 218 mm | 89% | 2 m/s | 4.5 |
| 1987 | 31.1°C | 28.4°C | 25.7°C | 32.4°C | 24.5°C | 135 mm | 89% | 2.5 m/s | 4.3 |
| 1986 | 30.7°C | 27.8°C | 24.9°C | 33.5°C | 23.2°C | 385 mm | 87% | 2.3 m/s | 4.2 |
| 1985 | 30.5°C | 27.8°C | 25.1°C | 32.2°C | 23.4°C | 213 mm | 89% | 2.3 m/s | 4.4 |
| 1984 ❄️ | 30.3°C | 27.3°C | 24.3°C | 32.2°C | 20.6°C | 100 mm | 86% | 2 m/s | 4.7 |
| 1983 | 31.3°C | 28.4°C | 25.4°C | 32.7°C | 24.0°C | 176 mm | 86% | 2.5 m/s | — |
| 1982 | 31.5°C | 28.1°C | 24.8°C | 33.0°C | 20.7°C | 103 mm | 86% | 2.1 m/s | — |
| 1981 | 30.5°C | 28.0°C | 25.5°C | 32.8°C | 24.3°C | 305 mm | 88% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.5°C with lows near 25.4°C (mean 28°C), based on 45 years of NASA POWER data.
September averages 258 mm of rainfall in Kolkata, a relatively wet time of year. The wettest on record was 580 mm in 2021.
The hottest September reached 33.7°C in 2017. The coldest dipped to 19.2°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.4°C — but days and nights have moved in opposite directions. Overnight lows rose from 25°C to 25.9°C while daytime highs eased from 30.8°C to 30.7°C, narrowing the gap between day and night.
September is one of the warmer months of the year in Kolkata and a relatively wet time of year, so plan for around 30.5°C daytime highs and 25.4°C at night.
Not quite — September is the 6th coolest month in Kolkata, averaging 28°C.
For September in Kolkata, pack light, breathable clothing and sun protection, with typical highs of 30.5°C and lows of 25.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 89% — quite humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.5 m/s (1983).
The wettest September on record was 2021 with 580 mm. On average, September sees 258 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 Kolkata 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.
