September is one of the warmer months of the year in Lahaul and Spiti, with average highs near 11.2°C and lows around 1.3°C (mean 6.3°C). It is a relatively wet time of year, averaging 99 mm of rainfall and 76% relative humidity across the period.
September is one of the warmer months of the year in Lahaul and Spiti. Across 45 years of records, the warmest Septembers in Lahaul and Spiti were 2021, 2024 and 2025 — when the month averaged 7.9°C — while the coldest was 1982 at 4.5°C. Typical September days reach 11.2°C with nights near 1.3°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Lahaul and Spiti, averaging 99 mm of rainfall. The wettest September on record was 2014 with 322 mm, while the driest was 1987 at 5 mm.
Relative humidity in Lahaul and Spiti during September averages 76%. The most humid September was 2021 at 86%, and the least humid was 1987 at 62%.
September receives about 5.5 kWh/m²/day of solar energy in Lahaul and Spiti. The sunniest September was 1987 at 6.6 kWh/m²/day, and the cloudiest were 2002, 2009 and 2010 at 4.8.
Average wind speed in Lahaul and Spiti during September is 1.5 m/s. The windiest September was 1987 at 1.7 m/s, while the calmest were 2019, 2021 and 2025, among others at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.8°C | 6.4°C | 5.7°C | 6.4°C | 7.4°C | +1.6°C |
| Avg High | 11.3°C | 11.4°C | 10.9°C | 10.7°C | 11.8°C | +0.5°C |
| Avg Low | 0.2°C | 1.2°C | 0.5°C | 2.1°C | 3.1°C | +2.9°C |
| Avg Rain | 69 mm | 84 mm | 84 mm | 136 mm | 135 mm | +65 mm |
September temperatures in Lahaul and Spiti have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -5.5°C (1988) to a record high of 17.1°C (2005).
Rainfall in September is a relatively wet time of year, averaging 99 mm, with a wettest year of 322 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.6°C per decade, narrowing the gap between day and night.
One of the best times to visit Lahaul and Spiti
September is one of the best times to visit Lahaul and Spiti. Expect days averaging 11.2°C and nights around 1.3°C (mean 6.3°C) — warmer than Lahaul and Spiti's yearly average — with higher rainfall (99 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 12.1°C | 7.9°C | 3.8°C | 15.4°C | -0.7°C | 192 mm | 83% | 1.4 m/s | 5.6 |
| 2024 | 12.5°C | 7.9°C | 3.3°C | 15.5°C | -0.4°C | 151 mm | 79% | 1.5 m/s | 5.5 |
| 2023 | 11.9°C | 7.3°C | 2.8°C | 16.3°C | -1.6°C | 107 mm | 78% | 1.5 m/s | 6.1 |
| 2022 | 10.9°C | 7.1°C | 3.3°C | 13.0°C | -2.4°C | 149 mm | 86% | 1.5 m/s | 5.4 |
| 2021 🔥 | 11.8°C | 7.9°C | 3.9°C | 15.3°C | -1.2°C | 181 mm | 86% | 1.4 m/s | 5.4 |
| 2020 | 11.3°C | 6.5°C | 1.7°C | 14.7°C | -2.5°C | 27 mm | 77% | 1.5 m/s | 6.5 |
| 2019 | 12.4°C | 7.5°C | 2.5°C | 15.6°C | -0.8°C | 90 mm | 77% | 1.4 m/s | 6 |
| 2018 | 9.6°C | 5.6°C | 1.6°C | 13.3°C | -3.8°C | 269 mm | 83% | 1.5 m/s | 5.1 |
| 2017 | 10.7°C | 6.3°C | 1.8°C | 14.3°C | -1.8°C | 68 mm | 80% | 1.5 m/s | 5.8 |
| 2016 | 11.1°C | 6.9°C | 2.7°C | 13.2°C | -1.2°C | 52 mm | 84% | 1.5 m/s | 6.2 |
| 2015 | 9.9°C | 5.6°C | 1.3°C | 12.3°C | -2.6°C | 73 mm | 78% | 1.6 m/s | 5.7 |
| 2014 🌧️ | 10.2°C | 6.1°C | 1.9°C | 13.7°C | -1.4°C | 322 mm | 83% | 1.5 m/s | 5.3 |
| 2013 | 10.8°C | 6.7°C | 2.6°C | 13.6°C | 0.3°C | 50 mm | 82% | 1.5 m/s | 5.8 |
| 2012 | 11.1°C | 7.1°C | 3.2°C | 14.8°C | -0.8°C | 133 mm | 84% | 1.5 m/s | 5.3 |
| 2011 | 10.7°C | 6.4°C | 2.0°C | 13.6°C | -2.5°C | 122 mm | 81% | 1.4 m/s | 5.5 |
| 2010 | 10.6°C | 6.1°C | 1.6°C | 14.6°C | -3.9°C | 178 mm | 80% | 1.5 m/s | 4.8 |
| 2009 | 11.6°C | 5.6°C | -0.5°C | 15.2°C | -5.5°C | 81 mm | 67% | 1.6 m/s | 4.8 |
| 2008 | 9.8°C | 4.8°C | -0.3°C | 12.9°C | -3.3°C | 117 mm | 73% | 1.5 m/s | 5.4 |
| 2007 | 11.0°C | 6.5°C | 1.9°C | 14.4°C | -4.1°C | 42 mm | 80% | 1.5 m/s | 5.4 |
| 2006 | 10.6°C | 5.9°C | 1.3°C | 14.2°C | -2.8°C | 150 mm | 77% | 1.4 m/s | 6.1 |
| 2005 | 12.0°C | 6.7°C | 1.3°C | 17.1°C | -3.4°C | 118 mm | 76% | 1.5 m/s | 5.1 |
| 2004 | 11.8°C | 6.5°C | 1.1°C | 16.7°C | -3.1°C | 12 mm | 66% | 1.5 m/s | 6.3 |
| 2003 | 11.2°C | 6.2°C | 1.2°C | 14.4°C | -4.3°C | 102 mm | 76% | 1.6 m/s | 5.5 |
| 2002 | 9.4°C | 4.6°C | -0.3°C | 12.0°C | -4.5°C | 125 mm | 74% | 1.6 m/s | 4.8 |
| 2001 | 10.5°C | 4.9°C | -0.6°C | 12.6°C | -3.9°C | 28 mm | 68% | 1.6 m/s | 6.3 |
| 2000 | 10.9°C | 5.6°C | 0.3°C | 14.1°C | -4.2°C | 66 mm | 72% | 1.6 m/s | 5.8 |
| 1999 | 13.2°C | 7.4°C | 1.6°C | 15.6°C | -2.8°C | 74 mm | 71% | 1.6 m/s | 5.7 |
| 1998 | 12.5°C | 7.2°C | 1.9°C | 15.4°C | -2.3°C | 43 mm | 76% | 1.6 m/s | 5 |
| 1997 | 11.4°C | 6.4°C | 1.4°C | 14.1°C | -2.7°C | 13 mm | 73% | 1.5 m/s | 5.6 |
| 1996 | 11.7°C | 6.5°C | 1.4°C | 15.1°C | -1.1°C | 73 mm | 74% | 1.5 m/s | 5.5 |
| 1995 | 10.3°C | 5.6°C | 0.8°C | 12.6°C | -1.6°C | 74 mm | 75% | 1.5 m/s | 5 |
| 1994 | 9.8°C | 5.2°C | 0.5°C | 13.0°C | -3.8°C | 64 mm | 70% | 1.6 m/s | 5.5 |
| 1993 | 10.9°C | 5.8°C | 0.6°C | 14.9°C | -2.1°C | 118 mm | 75% | 1.5 m/s | 5.3 |
| 1992 | 10.7°C | 5.7°C | 0.7°C | 15.3°C | -4.4°C | 127 mm | 74% | 1.6 m/s | 5.1 |
| 1991 | 11.8°C | 6.5°C | 1.2°C | 14.9°C | -4.0°C | 81 mm | 75% | 1.6 m/s | 5.7 |
| 1990 | 12.1°C | 7.2°C | 2.2°C | 15.9°C | -1.7°C | 173 mm | 78% | 1.4 m/s | 4.9 |
| 1989 | 11.7°C | 5.7°C | -0.2°C | 13.8°C | -3.2°C | 31 mm | 71% | 1.6 m/s | 5.9 |
| 1988 | 11.2°C | 5.9°C | 0.6°C | 16.6°C | -5.5°C | 219 mm | 72% | 1.5 m/s | 5.4 |
| 1987 | 13.3°C | 6.9°C | 0.5°C | 16.6°C | -3.8°C | 5 mm | 62% | 1.7 m/s | 6.6 |
| 1986 | 11.1°C | 5.4°C | -0.3°C | 16.6°C | -4.8°C | 46 mm | 71% | 1.6 m/s | 5.2 |
| 1985 | 11.4°C | 6.2°C | 0.9°C | 14.2°C | -2.2°C | 21 mm | 74% | 1.5 m/s | 5.1 |
| 1984 | 9.6°C | 4.8°C | 0.0°C | 13.1°C | -4.3°C | 112 mm | 78% | 1.5 m/s | 5.8 |
| 1983 | 12.8°C | 7.2°C | 1.6°C | 16.4°C | -3.3°C | 90 mm | 72% | 1.6 m/s | — |
| 1982 ❄️ | 10.5°C | 4.5°C | -1.4°C | 14.4°C | -5.0°C | 10 mm | 63% | 1.6 m/s | — |
| 1981 | 10.5°C | 5.5°C | 0.5°C | 13.0°C | -4.2°C | 87 mm | 75% | 1.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 11.2°C with lows near 1.3°C (mean 6.3°C), based on 45 years of NASA POWER data.
September averages 99 mm of rainfall in Lahaul and Spiti, a relatively wet time of year. The wettest on record was 322 mm in 2014.
The hottest September reached 17.1°C in 2005. The coldest dipped to -5.5°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2°C. Daytime highs moved from 11°C to 11.8°C and overnight lows from 0.3°C to 3.4°C over the same span.
September is one of the warmer months of the year in Lahaul and Spiti and a relatively wet time of year, so plan for around 11.2°C daytime highs and 1.3°C at night.
Not quite — September is the 9th coolest month in Lahaul and Spiti, averaging 6.3°C.
For September in Lahaul and Spiti, pack warm layers and a jacket for chilly mornings, with typical highs of 11.2°C and lows of 1.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 76% — quite humid.
Average wind speed in September is 1.5 m/s. The windiest September on record averaged 1.7 m/s (1987).
The wettest September on record was 2014 with 322 mm. On average, September sees 99 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 Lahaul and Spiti 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.
