September is one of the warmer months of the year in Shimla, with average highs near 28.9°C and lows around 20.2°C (mean 24.5°C). It is a relatively wet time of year, averaging 145 mm of rainfall and 71% relative humidity across the period.
September is one of the warmer months of the year in Shimla. Across 45 years of records, the warmest September in Shimla was 1987 — when the month averaged 28°C — while the coldest was 1994 at 22.9°C. Typical September days reach 28.9°C with nights near 20.2°C. The long-term trend is cooling, about 0.2°C per decade.
September is a relatively wet time of year in Shimla, averaging 145 mm of rainfall. The wettest September on record was 2010 with 355 mm, while the driest was 1987 at 8 mm.
Relative humidity in Shimla during September averages 71%. The most humid September was 2025 at 88%, and the least humid was 1987 at 39%.
September receives about 4.9 kWh/m²/day of solar energy in Shimla. The sunniest Septembers were 2001 and 2020 at 5.8 kWh/m²/day, and the cloudiest were 1990 and 2010 at 4.1.
Average wind speed in Shimla during September is 1.5 m/s. The windiest Septembers were 1982, 1987 and 2025 at 1.8 m/s, while the calmest were 2005, 2007 and 2021, among others at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.6°C | 24.2°C | 24.5°C | 24.1°C | 24.5°C | -1.1°C |
| Avg High | 31.0°C | 28.5°C | 29.1°C | 27.7°C | 28.0°C | -3°C |
| Avg Low | 20.1°C | 19.9°C | 19.9°C | 20.4°C | 21.0°C | +0.9°C |
| Avg Rain | 92 mm | 140 mm | 133 mm | 189 mm | 180 mm | +88 mm |
September temperatures in Shimla have fallen by about 0.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 13.8°C (1994) to a record high of 35.9°C (1987).
Rainfall in September is a relatively wet time of year, averaging 145 mm, with a wettest year of 355 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.7°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Shimla
September is a good time to visit Shimla, with days averaging 28.9°C and nights around 20.2°C (mean 24.5°C, warmer than Shimla's yearly average) and higher rainfall. October and April 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 | 27.3°C | 24.3°C | 21.3°C | 29.6°C | 20.1°C | 291 mm | 88% | 1.8 m/s | 4.4 |
| 2024 | 28.3°C | 24.9°C | 21.5°C | 30.5°C | 19.3°C | 205 mm | 85% | 1.3 m/s | 4.4 |
| 2023 | 27.9°C | 24.3°C | 20.8°C | 30.0°C | 18.4°C | 71 mm | 83% | 1.3 m/s | 5 |
| 2022 | 27.4°C | 24.1°C | 20.8°C | 29.0°C | 18.2°C | 255 mm | 86% | 1.4 m/s | 4.4 |
| 2021 | 27.7°C | 24.4°C | 21.1°C | 29.4°C | 20.1°C | 234 mm | 84% | 1.2 m/s | 4.3 |
| 2020 | 29.6°C | 25.1°C | 20.6°C | 31.2°C | 16.8°C | 23 mm | 74% | 1.6 m/s | 5.8 |
| 2019 | 28.0°C | 24.5°C | 21.0°C | 29.7°C | 18.6°C | 143 mm | 81% | 1.3 m/s | 4.8 |
| 2018 | 26.6°C | 23.3°C | 20.1°C | 29.8°C | 17.4°C | 303 mm | 83% | 1.4 m/s | 4.5 |
| 2017 | 28.0°C | 24.1°C | 20.2°C | 30.9°C | 18.2°C | 152 mm | 75% | 1.5 m/s | 5 |
| 2016 | 29.0°C | 25.0°C | 20.9°C | 30.4°C | 19.4°C | 48 mm | 72% | 1.5 m/s | 5.6 |
| 2015 | 28.9°C | 24.5°C | 20.1°C | 31.7°C | 16.9°C | 80 mm | 64% | 1.6 m/s | 5.6 |
| 2014 | 27.4°C | 23.9°C | 20.4°C | 29.9°C | 18.0°C | 265 mm | 80% | 1.6 m/s | 4.9 |
| 2013 | 27.3°C | 23.9°C | 20.5°C | 28.4°C | 18.7°C | 83 mm | 78% | 1.4 m/s | 5 |
| 2012 | 27.8°C | 24.4°C | 20.9°C | 30.1°C | 18.6°C | 193 mm | 78% | 1.6 m/s | 4.7 |
| 2011 | 27.1°C | 23.7°C | 20.3°C | 29.3°C | 17.6°C | 272 mm | 83% | 1.3 m/s | 4.9 |
| 2010 🌧️ | 26.7°C | 23.3°C | 19.9°C | 29.0°C | 16.3°C | 355 mm | 83% | 1.3 m/s | 4.1 |
| 2009 | 28.7°C | 24.3°C | 19.9°C | 30.9°C | 17.8°C | 177 mm | 71% | 1.4 m/s | 4.9 |
| 2008 | 27.1°C | 23.0°C | 18.8°C | 30.2°C | 16.1°C | 251 mm | 79% | 1.4 m/s | 5.1 |
| 2007 | 29.2°C | 24.9°C | 20.6°C | 30.3°C | 16.5°C | 70 mm | 69% | 1.2 m/s | 4.6 |
| 2006 | 28.9°C | 24.3°C | 19.6°C | 31.2°C | 16.2°C | 96 mm | 72% | 1.6 m/s | 5.3 |
| 2005 | 29.2°C | 25.0°C | 20.9°C | 33.7°C | 17.8°C | 217 mm | 71% | 1.2 m/s | 4.3 |
| 2004 | 29.6°C | 24.8°C | 20.0°C | 31.0°C | 17.5°C | 22 mm | 61% | 1.4 m/s | 5.5 |
| 2003 | 27.9°C | 24.2°C | 20.5°C | 29.4°C | 16.5°C | 158 mm | 76% | 1.2 m/s | 4.5 |
| 2002 | 28.6°C | 23.8°C | 19.1°C | 30.7°C | 16.2°C | 197 mm | 68% | 1.4 m/s | 4.6 |
| 2001 | 30.7°C | 25.0°C | 19.3°C | 32.5°C | 16.6°C | 45 mm | 56% | 1.5 m/s | 5.8 |
| 2000 | 30.9°C | 25.4°C | 20.0°C | 32.8°C | 16.5°C | 94 mm | 56% | 1.5 m/s | 5 |
| 1999 | 32.0°C | 26.8°C | 21.6°C | 34.5°C | 19.2°C | 110 mm | 57% | 1.4 m/s | 5 |
| 1998 | 29.5°C | 25.4°C | 21.3°C | 30.9°C | 19.5°C | 114 mm | 70% | 1.2 m/s | 4.3 |
| 1997 | 28.9°C | 24.2°C | 19.5°C | 30.6°C | 15.4°C | 41 mm | 67% | 1.4 m/s | 4.7 |
| 1996 | 27.5°C | 23.6°C | 19.8°C | 29.0°C | 17.6°C | 169 mm | 75% | 1.5 m/s | 4.7 |
| 1995 | 27.5°C | 23.4°C | 19.3°C | 30.9°C | 17.7°C | 136 mm | 76% | 1.5 m/s | 4.9 |
| 1994 ❄️ | 26.9°C | 22.9°C | 18.9°C | 29.3°C | 13.8°C | 69 mm | 74% | 1.4 m/s | 5.3 |
| 1993 | 28.2°C | 24.0°C | 19.7°C | 30.1°C | 17.1°C | 210 mm | 70% | 1.3 m/s | 4.6 |
| 1992 | 28.0°C | 23.5°C | 19.1°C | 30.4°C | 16.1°C | 118 mm | 72% | 1.5 m/s | 4.4 |
| 1991 | 28.4°C | 24.1°C | 19.8°C | 30.3°C | 15.3°C | 143 mm | 68% | 1.5 m/s | 5.1 |
| 1990 | 28.1°C | 24.3°C | 20.4°C | 31.2°C | 17.5°C | 289 mm | 78% | 1.4 m/s | 4.1 |
| 1989 | 31.4°C | 25.8°C | 20.2°C | 33.0°C | 18.0°C | 88 mm | 55% | 1.5 m/s | 5.3 |
| 1988 | 30.5°C | 25.6°C | 20.7°C | 34.1°C | 17.6°C | 266 mm | 64% | 1.7 m/s | 4.5 |
| 1987 🔥 | 34.7°C | 28.0°C | 21.4°C | 35.9°C | 17.4°C | 8 mm | 39% | 1.8 m/s | 5.6 |
| 1986 | 32.3°C | 26.1°C | 19.8°C | 34.5°C | 17.1°C | 57 mm | 45% | 1.7 m/s | 4.8 |
| 1985 | 29.0°C | 24.4°C | 19.9°C | 30.4°C | 17.2°C | 63 mm | 67% | 1.4 m/s | 4.5 |
| 1984 | 27.3°C | 23.0°C | 18.7°C | 29.4°C | 15.3°C | 128 mm | 75% | 1.4 m/s | 5 |
| 1983 | 31.2°C | 26.2°C | 21.2°C | 32.8°C | 19.4°C | 98 mm | 61% | 1.6 m/s | — |
| 1982 | 33.0°C | 26.4°C | 19.7°C | 35.1°C | 16.1°C | 8 mm | 39% | 1.8 m/s | — |
| 1981 | 29.5°C | 24.6°C | 19.7°C | 31.6°C | 18.0°C | 114 mm | 66% | 1.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.9°C with lows near 20.2°C (mean 24.5°C), based on 45 years of NASA POWER data.
September averages 145 mm of rainfall in Shimla, a relatively wet time of year. The wettest on record was 355 mm in 2010.
The hottest September reached 35.9°C in 1987. The coldest dipped to 13.8°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have fallen by about 0.5°C — but days and nights have moved in opposite directions. Overnight lows rose from 19.8°C to 21.1°C while daytime highs eased from 30°C to 27.7°C, narrowing the gap between day and night.
September is one of the warmer months of the year in Shimla and a relatively wet time of year, so plan for around 28.9°C daytime highs and 20.2°C at night.
Not quite — September is the 8th coolest month in Shimla, averaging 24.5°C.
For September in Shimla, pack light layers you can adjust through the day, with typical highs of 28.9°C and lows of 20.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 1.5 m/s. The windiest September on record averaged 1.8 m/s (1982).
The wettest September on record was 2010 with 355 mm. On average, September sees 145 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 Shimla 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.
