September is one of the warmer months of the year in Inverness, with average highs near 13.8°C and lows around 7.4°C (mean 10.6°C). It is about average for rainfall, averaging 76 mm of rainfall and 88% relative humidity across the period.
September is one of the warmer months of the year in Inverness. Across 45 years of records, the warmest September in Inverness was 2006 — when the month averaged 12.6°C — while the coldest was 1986 at 8.5°C. Typical September days reach 13.8°C with nights near 7.4°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Inverness, averaging 76 mm of rainfall. The wettest September on record was 1995 with 235 mm, while the driest was 1993 at 32 mm.
Relative humidity in Inverness during September averages 88%. The most humid September was 2001 at 92%, and the least humid was 2025 at 86%.
September receives about 2.4 kWh/m²/day of solar energy in Inverness. The sunniest September was 1996 at 2.8 kWh/m²/day, and the cloudiest were 1984 and 2000 at 2.
Average wind speed in Inverness during September is 3.6 m/s. The windiest September was 2012 at 4.9 m/s, while the calmest were 2002 and 2014 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.7°C | 10.3°C | 10.9°C | 10.7°C | 11.4°C | +1.7°C |
| Avg High | 12.8°C | 13.6°C | 14.1°C | 13.8°C | 14.9°C | +2.1°C |
| Avg Low | 6.6°C | 7.1°C | 7.8°C | 7.6°C | 7.9°C | +1.3°C |
| Avg Rain | 81 mm | 81 mm | 74 mm | 77 mm | 62 mm | -18 mm |
September temperatures in Inverness have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.1°C (1986) to a record high of 24.7°C (2023).
Rainfall in September is about average for rainfall, averaging 76 mm, with a wettest year of 235 mm.
One of the best times to visit Inverness
September is one of the best times to visit Inverness. Expect days averaging 13.8°C and nights around 7.4°C (mean 10.6°C) — warmer than Inverness's yearly average — with moderate rainfall (76 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 | 14.4°C | 10.9°C | 7.4°C | 18.9°C | 3.0°C | 59 mm | 86% | 3.8 m/s | 2.5 |
| 2024 | 14.3°C | 10.6°C | 6.8°C | 22.1°C | 1.6°C | 50 mm | 89% | 2.8 m/s | 2.6 |
| 2023 | 15.8°C | 12.2°C | 8.7°C | 24.7°C | 3.3°C | 92 mm | 87% | 3.7 m/s | 2.6 |
| 2022 | 14.7°C | 11.4°C | 8.2°C | 20.6°C | 4.4°C | 54 mm | 89% | 3.3 m/s | 2.4 |
| 2021 | 16.0°C | 12.5°C | 8.9°C | 22.4°C | 4.7°C | 54 mm | 89% | 3 m/s | 2.2 |
| 2020 | 14.1°C | 10.8°C | 7.4°C | 19.5°C | 2.1°C | 65 mm | 87% | 3.9 m/s | 2.3 |
| 2019 | 14.2°C | 10.8°C | 7.4°C | 19.5°C | 4.2°C | 68 mm | 88% | 3.5 m/s | 2.5 |
| 2018 | 12.8°C | 9.8°C | 6.9°C | 19.3°C | 3.8°C | 96 mm | 87% | 4.6 m/s | 2.4 |
| 2017 | 13.7°C | 10.7°C | 7.7°C | 17.6°C | 3.9°C | 111 mm | 89% | 3.2 m/s | 2.3 |
| 2016 | 15.0°C | 11.8°C | 8.6°C | 20.7°C | 4.7°C | 74 mm | 88% | 4 m/s | 2.2 |
| 2015 | 13.5°C | 10.1°C | 6.8°C | 16.6°C | 5.2°C | 53 mm | 90% | 3 m/s | 2.7 |
| 2014 | 15.3°C | 12.1°C | 8.8°C | 19.5°C | 7.1°C | 33 mm | 89% | 2.6 m/s | 2.4 |
| 2013 | 13.9°C | 10.5°C | 7.2°C | 18.5°C | 2.7°C | 52 mm | 89% | 3.6 m/s | 2.4 |
| 2012 | 11.9°C | 9.4°C | 6.8°C | 17.3°C | 2.7°C | 66 mm | 88% | 4.9 m/s | 2.3 |
| 2011 | 13.9°C | 11.0°C | 8.1°C | 19.6°C | 4.5°C | 106 mm | 90% | 4 m/s | 2.2 |
| 2010 | 13.6°C | 10.4°C | 7.3°C | 19.1°C | 1.8°C | 110 mm | 89% | 3.5 m/s | 2.4 |
| 2009 | 13.8°C | 11.1°C | 8.4°C | 17.5°C | 6.2°C | 94 mm | 89% | 4.2 m/s | 2.4 |
| 2008 | 13.8°C | 10.8°C | 7.8°C | 17.2°C | 4.7°C | 75 mm | 88% | 2.9 m/s | 2.2 |
| 2007 | 13.0°C | 9.8°C | 6.5°C | 18.3°C | 1.5°C | 56 mm | 89% | 3.9 m/s | 2.2 |
| 2006 🔥 | 16.3°C | 12.6°C | 8.9°C | 20.1°C | 5.4°C | 113 mm | 89% | 3 m/s | 2.5 |
| 2005 | 14.3°C | 11.2°C | 8.0°C | 21.9°C | 3.9°C | 67 mm | 88% | 4.3 m/s | 2.2 |
| 2004 | 14.1°C | 11.0°C | 7.8°C | 19.5°C | 2.9°C | 92 mm | 88% | 4.3 m/s | 2.6 |
| 2003 | 14.1°C | 10.8°C | 7.6°C | 18.5°C | 2.7°C | 52 mm | 88% | 3.2 m/s | 2.5 |
| 2002 | 14.7°C | 11.4°C | 8.1°C | 19.8°C | 5.6°C | 45 mm | 89% | 2.6 m/s | 2.5 |
| 2001 | 12.9°C | 9.9°C | 7.0°C | 15.9°C | 4.1°C | 67 mm | 92% | 3.3 m/s | 2.1 |
| 2000 | 14.1°C | 10.8°C | 7.6°C | 17.2°C | 4.8°C | 81 mm | 89% | 3.4 m/s | 2 |
| 1999 | 15.1°C | 11.6°C | 8.2°C | 21.2°C | 4.8°C | 109 mm | 90% | 3.5 m/s | 2.2 |
| 1998 | 14.7°C | 11.5°C | 8.2°C | 20.9°C | 3.4°C | 74 mm | 91% | 2.8 m/s | 2.6 |
| 1997 | 13.6°C | 10.2°C | 6.8°C | 18.1°C | 1.4°C | 48 mm | 88% | 3.9 m/s | 2.6 |
| 1996 | 14.6°C | 11.1°C | 7.7°C | 20.5°C | 3.6°C | 39 mm | 89% | 3.2 m/s | 2.8 |
| 1995 🌧️ | 13.1°C | 10.3°C | 7.6°C | 17.2°C | 2.2°C | 235 mm | 91% | 3 m/s | 2.1 |
| 1994 | 12.7°C | 9.4°C | 6.1°C | 17.0°C | 3.2°C | 64 mm | 88% | 3.3 m/s | 2.5 |
| 1993 | 12.9°C | 9.2°C | 5.6°C | 17.9°C | 0.1°C | 32 mm | 88% | 2.7 m/s | 2.3 |
| 1992 | 13.1°C | 10.0°C | 7.0°C | 17.9°C | 3.7°C | 90 mm | 88% | 3.8 m/s | 2.4 |
| 1991 | 14.1°C | 10.6°C | 7.2°C | 21.6°C | 2.2°C | 52 mm | 86% | 3.6 m/s | 2.7 |
| 1990 | 12.5°C | 9.4°C | 6.3°C | 18.7°C | 2.7°C | 70 mm | 88% | 4 m/s | 2.2 |
| 1989 | 13.4°C | 10.0°C | 6.6°C | 16.3°C | 3.0°C | 49 mm | 87% | 3.9 m/s | 2.3 |
| 1988 | 13.0°C | 10.3°C | 7.5°C | 19.8°C | 2.4°C | 71 mm | 88% | 4.5 m/s | 2.2 |
| 1987 | 12.5°C | 9.6°C | 6.8°C | 17.1°C | 3.5°C | 69 mm | 87% | 4.4 m/s | 2.6 |
| 1986 ❄️ | 11.7°C | 8.5°C | 5.3°C | 16.1°C | -0.1°C | 35 mm | 88% | 4 m/s | 2.3 |
| 1985 | 12.7°C | 9.8°C | 6.9°C | 18.8°C | 3.5°C | 104 mm | 90% | 3.6 m/s | 2.2 |
| 1984 | 12.6°C | 9.5°C | 6.5°C | 15.8°C | 3.4°C | 87 mm | 87% | 3 m/s | 2 |
| 1983 | 12.2°C | 9.4°C | 6.5°C | 16.5°C | 2.4°C | 108 mm | 88% | 4.4 m/s | — |
| 1982 | 12.7°C | 9.4°C | 6.2°C | 18.1°C | 2.3°C | 92 mm | 88% | 4.6 m/s | — |
| 1981 | 14.0°C | 10.6°C | 7.2°C | 18.4°C | 3.8°C | 113 mm | 88% | 3.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 13.8°C with lows near 7.4°C (mean 10.6°C), based on 45 years of NASA POWER data.
September averages 76 mm of rainfall in Inverness, about average for rainfall. The wettest on record was 235 mm in 1995.
The hottest September reached 24.7°C in 2023. The coldest dipped to -0.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 12.8°C to 15°C and overnight lows from 6.7°C to 8°C over the same span.
September is one of the warmer months of the year in Inverness and about average for rainfall, so plan for around 13.8°C daytime highs and 7.4°C at night.
Not quite — September is the 9th coolest month in Inverness, averaging 10.6°C.
For September in Inverness, pack warm layers and a jacket for chilly mornings, with typical highs of 13.8°C and lows of 7.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 88% — quite humid.
Average wind speed in September is 3.6 m/s. The windiest September on record averaged 4.9 m/s (2012).
The wettest September on record was 1995 with 235 mm. On average, September sees 76 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 Inverness 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.
