September is one of the warmer months of the year in Dehradun, with average highs near 27.2°C and lows around 14.4°C (mean 20.8°C). It is a relatively wet time of year, averaging 162 mm of rainfall and 78% relative humidity across the period.
September is one of the warmer months of the year in Dehradun. Across 45 years of records, the warmest September in Dehradun was 1987 — when the month averaged 23.2°C — while the coldest was 1997 at 18.3°C. Typical September days reach 27.2°C with nights near 14.4°C. The long-term trend is warming, about 0.2°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 20.4°C | 20.3°C | 20.8°C | 21.8°C | +0.7°C |
| Avg High | 28.3°C | 27.1°C | 27.0°C | 26.7°C | 27.3°C | -1°C |
| Avg Low | 13.9°C | 13.7°C | 13.6°C | 15.0°C | 16.4°C | +2.5°C |
| Avg Rain | 105 mm | 159 mm | 139 mm | 204 mm | 217 mm | +112 mm |
September temperatures in Dehradun have risen by about 1.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 10.2°C (1997) to a record high of 32.1°C (1987).
Rainfall in September is a relatively wet time of year, averaging 162 mm, with a wettest year of 495 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.7°C per decade, narrowing the gap between day and night.
One of the best times to visit Dehradun
September is one of the best times to visit Dehradun. Expect days averaging 27.2°C and nights around 14.4°C (mean 20.8°C) — warmer than Dehradun's yearly average — with higher rainfall (162 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 27.2°C | 17.9°C | 22.5°C | 269 mm | 89% | 1.5 m/s | 4.6 |
| 2024 | 27.7°C | 17.3°C | 22.5°C | 250 mm | 87% | 1.3 m/s | 4.4 |
| 2023 | 27.8°C | 16.4°C | 22.1°C | 108 mm | 83% | 1.3 m/s | 5.2 |
| 2022 | 26.5°C | 16.4°C | 21.5°C | 371 mm | 88% | 1.3 m/s | 4.5 |
| 2021 | 26.7°C | 16.9°C | 21.8°C | 260 mm | 86% | 1.2 m/s | 4.3 |
| 2020 | 27.8°C | 13.7°C | 20.7°C | 45 mm | 76% | 1.3 m/s | 5.5 |
| 2019 | 27.2°C | 15.5°C | 21.3°C | 207 mm | 85% | 1.3 m/s | 4.7 |
| 2018 | 27.3°C | 15.1°C | 21.2°C | 277 mm | 85% | 1.3 m/s | 4.8 |
| 2017 | 27.5°C | 16.2°C | 21.9°C | 212 mm | 81% | 1.3 m/s | 5.1 |
| 2016 | 26.3°C | 16.1°C | 21.2°C | 69 mm | 81% | 1.3 m/s | 5.6 |
| 2015 | 27.0°C | 14.5°C | 20.8°C | 67 mm | 73% | 1.5 m/s | 5.8 |
| 2014 | 26.5°C | 14.7°C | 20.6°C | 107 mm | 83% | 1.5 m/s | 5.2 |
| 2013 | 26.1°C | 15.3°C | 20.7°C | 134 mm | 83% | 1.4 m/s | 5.2 |
| 2012 | 26.3°C | 15.0°C | 20.7°C | 247 mm | 85% | 1.5 m/s | 5.1 |
| 2011 | 26.5°C | 14.2°C | 20.3°C | 230 mm | 84% | 1.3 m/s | 5.2 |
| 2010 🌧️ | 25.8°C | 13.6°C | 19.7°C | 495 mm | 86% | 1.3 m/s | 3.9 |
| 2009 | 26.8°C | 14.3°C | 20.6°C | 178 mm | 78% | 1.3 m/s | 5 |
| 2008 | 27.0°C | 14.2°C | 20.6°C | 134 mm | 79% | 1.3 m/s | 5.2 |
| 2007 | 26.0°C | 14.4°C | 20.2°C | 142 mm | 80% | 1.3 m/s | 5 |
| 2006 | 27.0°C | 12.6°C | 19.8°C | 94 mm | 77% | 1.4 m/s | 5.4 |
| 2005 | 27.6°C | 14.2°C | 20.9°C | 245 mm | 81% | 1.2 m/s | 4.2 |
| 2004 | 27.6°C | 14.4°C | 21.0°C | 42 mm | 71% | 1.4 m/s | 5.3 |
| 2003 | 26.8°C | 13.3°C | 20.0°C | 213 mm | 82% | 1.3 m/s | 4.4 |
| 2002 | 26.4°C | 12.9°C | 19.7°C | 168 mm | 75% | 1.3 m/s | 4.5 |
| 2001 | 26.5°C | 13.0°C | 19.8°C | 67 mm | 69% | 1.4 m/s | 5.9 |
| 2000 | 27.9°C | 12.2°C | 20.0°C | 107 mm | 67% | 1.5 m/s | 5 |
| 1999 | 30.7°C | 15.4°C | 23.0°C | 161 mm | 74% | 1.3 m/s | 4.6 |
| 1998 | 27.1°C | 15.4°C | 21.3°C | 146 mm | 82% | 1.3 m/s | 4.8 |
| 1997 ❄️ | 26.3°C | 10.2°C | 18.3°C | 87 mm | 76% | 1.4 m/s | 5.1 |
| 1996 | 26.3°C | 14.5°C | 20.4°C | 182 mm | 82% | 1.3 m/s | 4.5 |
| 1995 | 26.6°C | 14.2°C | 20.4°C | 185 mm | 79% | 1.4 m/s | 4.8 |
| 1994 | 26.4°C | 12.3°C | 19.3°C | 39 mm | 76% | 1.3 m/s | 5.9 |
| 1993 | 26.0°C | 13.6°C | 19.8°C | 255 mm | 80% | 1.2 m/s | 4.6 |
| 1992 | 27.2°C | 14.0°C | 20.6°C | 109 mm | 77% | 1.4 m/s | 4.8 |
| 1991 | 26.4°C | 13.3°C | 19.9°C | 143 mm | 76% | 1.4 m/s | 5.3 |
| 1990 | 27.7°C | 14.4°C | 21.0°C | 286 mm | 85% | 1.3 m/s | 4.2 |
| 1989 | 28.6°C | 14.9°C | 21.8°C | 93 mm | 68% | 1.4 m/s | 5.2 |
| 1988 | 27.9°C | 15.2°C | 21.5°C | 210 mm | 78% | 1.3 m/s | 4.8 |
| 1987 🔥 | 32.1°C | 14.2°C | 23.2°C | 39 mm | 51% | 1.7 m/s | 5.5 |
| 1986 | 30.8°C | 13.2°C | 22.0°C | 80 mm | 55% | 1.6 m/s | 5 |
| 1985 | 27.0°C | 14.0°C | 20.5°C | 149 mm | 79% | 1.3 m/s | 4.4 |
| 1984 | 26.0°C | 12.0°C | 19.0°C | 132 mm | 78% | 1.3 m/s | 5.2 |
| 1983 | 26.8°C | 15.4°C | 21.1°C | 127 mm | 78% | 1.3 m/s | — |
| 1982 | 28.1°C | 11.0°C | 19.5°C | 11 mm | 56% | 1.6 m/s | — |
| 1981 | 27.3°C | 14.8°C | 21.0°C | 107 mm | 74% | 1.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 27.2°C with lows near 14.4°C (mean 20.8°C), based on 45 years of NASA POWER data.
September averages 162 mm of rainfall in Dehradun, a relatively wet time of year. The wettest on record was 495 mm in 2010.
The hottest September reached 32.1°C in 1987. The coldest dipped to 10.2°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.9°C. Daytime highs moved from 27°C to 27.2°C and overnight lows from 13.4°C to 17°C over the same span.
September is one of the warmer months of the year in Dehradun and a relatively wet time of year, so plan for around 27.2°C daytime highs and 14.4°C at night.
Not quite — September is the 7th coolest month in Dehradun, averaging 20.8°C.
For September in Dehradun, pack light layers you can adjust through the day, with typical highs of 27.2°C and lows of 14.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 78% — quite humid.
Average wind speed in September is 1.4 m/s. The windiest September on record averaged 1.7 m/s (1987).
The wettest September on record was 2010 with 495 mm. On average, September sees 162 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 Dehradun 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.
