September is one of the cooler months of the year in Hassan, with average highs near 28.3°C and lows around 17°C (mean 22.7°C). It is a relatively wet time of year, averaging 157 mm of rainfall and 87% relative humidity across the period.
September is one of the cooler months of the year in Hassan. Across 45 years of records, the warmest Septembers in Hassan were 2015 and 2018 — when the month averaged 24.3°C — while the coldest was 1983 at 21.5°C. Typical September days reach 28.3°C with nights near 17°C. The long-term trend is warming, about 0.3°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.2°C | 22.3°C | 22.6°C | 23.0°C | 23.3°C | +1.1°C |
| Avg High | 27.8°C | 27.7°C | 28.2°C | 28.9°C | 29.2°C | +1.4°C |
| Avg Low | 16.6°C | 16.9°C | 17.0°C | 17.1°C | 17.5°C | +0.9°C |
| Avg Rain | 148 mm | 132 mm | 172 mm | 190 mm | 132 mm | -16 mm |
September temperatures in Hassan have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 14.9°C (1994) to a record high of 31.5°C (2018).
Rainfall in September is a relatively wet time of year, averaging 157 mm, with a wettest year of 331 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A good time to visit Hassan
September is a good time to visit Hassan, with days averaging 28.3°C and nights around 17°C (mean 22.7°C, close to Hassan's yearly average) and higher rainfall. January and February are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.7°C | 17.9°C | 23.8°C | 88 mm | 84% | 2.5 m/s | 4.7 |
| 2024 | 28.9°C | 17.7°C | 23.3°C | 71 mm | 85% | 2.7 m/s | 4.9 |
| 2023 | 30.1°C | 18.1°C | 24.1°C | 126 mm | 82% | 2.8 m/s | 4.8 |
| 2022 | 28.0°C | 16.8°C | 22.4°C | 126 mm | 88% | 2.2 m/s | 4.8 |
| 2021 | 29.3°C | 17.9°C | 23.6°C | 154 mm | 84% | 2.7 m/s | 4.9 |
| 2020 | 28.9°C | 16.3°C | 22.6°C | 229 mm | 87% | 2.6 m/s | 4.6 |
| 2019 | 29.9°C | 17.2°C | 23.6°C | 174 mm | 85% | 2.6 m/s | 4.6 |
| 2018 | 31.5°C | 17.0°C | 24.3°C | 152 mm | 78% | 2 m/s | 5.6 |
| 2017 | 29.1°C | 17.5°C | 23.3°C | 211 mm | 86% | 1.9 m/s | 4.9 |
| 2016 | 30.0°C | 16.3°C | 23.2°C | 56 mm | 80% | 2.9 m/s | 4.6 |
| 2015 🔥 | 30.6°C | 17.9°C | 24.3°C | 149 mm | 83% | 2.1 m/s | 5.3 |
| 2014 | 27.2°C | 17.7°C | 22.5°C | 263 mm | 90% | 2.3 m/s | 5.1 |
| 2013 | 27.2°C | 17.4°C | 22.3°C | 238 mm | 90% | 2.2 m/s | 5.1 |
| 2012 | 28.2°C | 16.7°C | 22.4°C | 187 mm | 88% | 2.5 m/s | 5.3 |
| 2011 | 27.7°C | 16.4°C | 22.0°C | 201 mm | 88% | 2.6 m/s | 5.1 |
| 2010 | 27.7°C | 16.8°C | 22.3°C | 269 mm | 89% | 2.2 m/s | 5.1 |
| 2009 | 27.9°C | 17.7°C | 22.8°C | 277 mm | 90% | 2.3 m/s | 4.8 |
| 2008 | 27.5°C | 16.2°C | 21.9°C | 143 mm | 88% | 2.3 m/s | 5.5 |
| 2007 🌧️ | 27.6°C | 16.7°C | 22.2°C | 331 mm | 90% | 2.5 m/s | 4.8 |
| 2006 | 29.2°C | 15.8°C | 22.5°C | 221 mm | 87% | 2.5 m/s | 5.3 |
| 2005 | 27.4°C | 17.6°C | 22.5°C | 206 mm | 90% | 2.5 m/s | 5 |
| 2004 | 27.9°C | 16.8°C | 22.3°C | 105 mm | 87% | 1.9 m/s | 5.2 |
| 2003 | 28.6°C | 17.5°C | 23.1°C | 64 mm | 86% | 2.5 m/s | 5.4 |
| 2002 | 29.6°C | 16.7°C | 23.1°C | 90 mm | 82% | 2.2 m/s | 5.8 |
| 2001 | 28.1°C | 17.3°C | 22.7°C | 166 mm | 87% | 1.8 m/s | 5.4 |
| 2000 | 28.3°C | 17.8°C | 23.0°C | 120 mm | 86% | 2 m/s | 5.3 |
| 1999 | 28.1°C | 17.1°C | 22.6°C | 116 mm | 86% | 2.2 m/s | 5.5 |
| 1998 | 26.7°C | 17.6°C | 22.2°C | 266 mm | 90% | 2.3 m/s | 5 |
| 1997 | 27.8°C | 17.6°C | 22.7°C | 89 mm | 88% | 1.9 m/s | 5.2 |
| 1996 | 27.2°C | 16.6°C | 21.9°C | 208 mm | 89% | 2.3 m/s | 5.1 |
| 1995 | 27.5°C | 17.4°C | 22.4°C | 146 mm | 88% | 2.5 m/s | 5.3 |
| 1994 | 28.2°C | 14.9°C | 21.6°C | 91 mm | 87% | 2.5 m/s | 5.8 |
| 1993 | 27.3°C | 16.6°C | 21.9°C | 113 mm | 88% | 2.3 m/s | 5.6 |
| 1992 | 27.7°C | 17.5°C | 22.6°C | 136 mm | 88% | 2.2 m/s | 5.2 |
| 1991 | 28.6°C | 17.1°C | 22.8°C | 76 mm | 86% | 2 m/s | 5.5 |
| 1990 | 28.0°C | 16.5°C | 22.3°C | 82 mm | 86% | 2.4 m/s | 5.1 |
| 1989 | 27.0°C | 16.3°C | 21.6°C | 159 mm | 88% | 2 m/s | 5.1 |
| 1988 | 27.7°C | 17.2°C | 22.4°C | 255 mm | 90% | 2.6 m/s | 5 |
| 1987 | 28.8°C | 17.2°C | 23.0°C | 95 mm | 86% | 2 m/s | 5.6 |
| 1986 | 28.3°C | 16.7°C | 22.5°C | 148 mm | 86% | 2.2 m/s | 5.3 |
| 1985 | 28.5°C | 16.0°C | 22.2°C | 68 mm | 84% | 2 m/s | 5.6 |
| 1984 | 28.9°C | 16.3°C | 22.6°C | 83 mm | 84% | 2 m/s | 5.5 |
| 1983 ❄️ | 26.5°C | 16.5°C | 21.5°C | 226 mm | 89% | 2.9 m/s | — |
| 1982 | 27.5°C | 15.6°C | 21.6°C | 96 mm | 86% | 2.3 m/s | — |
| 1981 | 27.4°C | 17.4°C | 22.4°C | 204 mm | 89% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.3°C with lows near 17°C (mean 22.7°C), based on 45 years of NASA POWER data.
September averages 157 mm of rainfall in Hassan, a relatively wet time of year. The wettest on record was 331 mm in 2007.
The hottest September reached 31.5°C in 2018. The coldest dipped to 14.9°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 27.8°C to 29.2°C and overnight lows from 16.4°C to 17.7°C over the same span.
September is one of the cooler months of the year in Hassan and a relatively wet time of year, so plan for around 28.3°C daytime highs and 17°C at night.
Not quite — September is the 5th coolest month in Hassan, averaging 22.7°C.
For September in Hassan, pack light layers you can adjust through the day, with typical highs of 28.3°C and lows of 17°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 87% — quite humid.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 2.9 m/s (1983).
The wettest September on record was 2007 with 331 mm. On average, September sees 157 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 Hassan 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.
