September is one of the warmer months of the year in Inverness, with average highs near 18.8°C and lows around 12.5°C (mean 15.7°C). It is about average for rainfall, averaging 80 mm of rainfall and 79% 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 1999 — when the month averaged 18.5°C — while the coldest was 1986 at 12.9°C. Typical September days reach 18.8°C with nights near 12.5°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Inverness, averaging 80 mm of rainfall. The wettest September on record was 2012 with 171 mm, while the driest was 1985 at 24 mm.
Relative humidity in Inverness during September averages 79%. The most humid September was 1982 at 85%, and the least humid was 1995 at 72%.
September receives about 3.6 kWh/m²/day of solar energy in Inverness. The sunniest Septembers were 2003, 2009 and 2025 at 4.1 kWh/m²/day, and the cloudiest were 1991 and 1997 at 3.
Average wind speed in Inverness during September is 2.2 m/s. The windiest Septembers were 1981 and 2004 at 2.6 m/s, while the calmest were 1982, 2003 and 2023 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.7°C | 15.7°C | 15.4°C | 16.0°C | 16.9°C | +2.2°C |
| Avg High | 17.8°C | 19.0°C | 18.6°C | 19.0°C | 20.0°C | +2.2°C |
| Avg Low | 11.7°C | 12.4°C | 12.3°C | 12.9°C | 13.7°C | +2°C |
| Avg Rain | 82 mm | 65 mm | 84 mm | 95 mm | 70 mm | -12 mm |
September temperatures in Inverness have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.2°C (2000) to a record high of 27.9°C (2001).
Rainfall in September is about average for rainfall, averaging 80 mm, with a wettest year of 171 mm.
One of the best times to visit Inverness
September is one of the best times to visit Inverness. Expect days averaging 18.8°C and nights around 12.5°C (mean 15.7°C) — warmer than Inverness's yearly average — with higher rainfall (80 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 | 20.6°C | 17.0°C | 13.5°C | 26.6°C | 10.0°C | 30 mm | 74% | 2.1 m/s | 4.1 |
| 2024 | 19.9°C | 16.8°C | 13.6°C | 25.4°C | 9.2°C | 56 mm | 79% | 2.1 m/s | 3.9 |
| 2023 | 20.5°C | 17.5°C | 14.4°C | 26.1°C | 8.4°C | 63 mm | 84% | 1.9 m/s | 3.5 |
| 2022 | 19.4°C | 16.4°C | 13.5°C | 24.9°C | 8.8°C | 141 mm | 79% | 2.5 m/s | 3.7 |
| 2021 | 20.2°C | 17.1°C | 14.0°C | 24.9°C | 9.8°C | 87 mm | 82% | 2.3 m/s | 3.5 |
| 2020 | 19.7°C | 16.4°C | 13.1°C | 25.3°C | 7.8°C | 47 mm | 77% | 2.3 m/s | 3.8 |
| 2019 | 17.3°C | 14.4°C | 11.5°C | 23.3°C | 6.0°C | 100 mm | 81% | 2.4 m/s | 3.4 |
| 2018 | 19.6°C | 16.0°C | 12.4°C | 26.3°C | 6.1°C | 81 mm | 77% | 2.2 m/s | 4 |
| 2017 | 19.7°C | 16.7°C | 13.7°C | 24.3°C | 7.5°C | 105 mm | 83% | 2.2 m/s | 3.3 |
| 2016 | 19.0°C | 16.0°C | 13.1°C | 25.8°C | 8.2°C | 97 mm | 82% | 2.3 m/s | 3.6 |
| 2015 | 20.1°C | 16.7°C | 13.4°C | 24.4°C | 7.9°C | 64 mm | 83% | 2.2 m/s | 3.9 |
| 2014 | 18.9°C | 15.6°C | 12.2°C | 25.4°C | 8.6°C | 82 mm | 79% | 2.2 m/s | 3.9 |
| 2013 | 18.8°C | 15.7°C | 12.6°C | 24.6°C | 9.0°C | 88 mm | 84% | 2.2 m/s | 3.2 |
| 2012 🌧️ | 19.3°C | 16.6°C | 13.9°C | 24.8°C | 10.2°C | 171 mm | 84% | 2.3 m/s | 3.4 |
| 2011 | 19.2°C | 16.1°C | 12.9°C | 23.6°C | 8.2°C | 49 mm | 81% | 2.1 m/s | 4 |
| 2010 | 18.6°C | 15.8°C | 13.0°C | 27.9°C | 7.3°C | 111 mm | 83% | 2.2 m/s | 3.1 |
| 2009 | 17.4°C | 14.0°C | 10.7°C | 22.3°C | 7.1°C | 69 mm | 81% | 2.3 m/s | 4.1 |
| 2008 | 17.2°C | 14.7°C | 12.1°C | 22.9°C | 6.8°C | 79 mm | 84% | 2.3 m/s | 3.4 |
| 2007 | 17.7°C | 14.6°C | 11.6°C | 23.4°C | 6.2°C | 105 mm | 81% | 2.4 m/s | 3.8 |
| 2006 | 18.7°C | 15.6°C | 12.6°C | 22.7°C | 8.5°C | 38 mm | 80% | 2.2 m/s | 3.6 |
| 2005 | 19.6°C | 16.5°C | 13.3°C | 24.8°C | 8.7°C | 118 mm | 79% | 2.4 m/s | 3.6 |
| 2004 | 17.7°C | 14.5°C | 11.4°C | 22.9°C | 7.7°C | 81 mm | 76% | 2.6 m/s | 3.5 |
| 2003 | 20.2°C | 16.9°C | 13.5°C | 24.6°C | 9.5°C | 76 mm | 81% | 1.9 m/s | 4.1 |
| 2002 | 19.4°C | 15.9°C | 12.5°C | 24.9°C | 8.7°C | 126 mm | 79% | 2.2 m/s | 3.7 |
| 2001 | 19.7°C | 16.4°C | 13.1°C | 27.9°C | 7.9°C | 77 mm | 76% | 2.1 m/s | 4 |
| 2000 | 18.0°C | 14.9°C | 11.9°C | 24.5°C | 5.2°C | 68 mm | 77% | 2.4 m/s | 3.6 |
| 1999 🔥 | 21.7°C | 18.5°C | 15.3°C | 25.8°C | 9.6°C | 65 mm | 81% | 2.1 m/s | 3.8 |
| 1998 | 17.7°C | 14.9°C | 12.2°C | 22.2°C | 8.8°C | 151 mm | 84% | 2.2 m/s | 3.4 |
| 1997 | 18.8°C | 15.6°C | 12.4°C | 23.0°C | 7.3°C | 64 mm | 80% | 2.1 m/s | 3 |
| 1996 | 17.9°C | 15.0°C | 12.2°C | 25.5°C | 7.1°C | 107 mm | 79% | 2.5 m/s | 3.2 |
| 1995 | 18.2°C | 14.5°C | 10.8°C | 24.1°C | 6.6°C | 27 mm | 72% | 2.2 m/s | 3.8 |
| 1994 | 18.5°C | 15.2°C | 11.9°C | 22.1°C | 8.4°C | 49 mm | 76% | 2.1 m/s | 3.7 |
| 1993 | 20.2°C | 16.5°C | 12.7°C | 27.0°C | 8.9°C | 36 mm | 74% | 2.2 m/s | 3.4 |
| 1992 | 20.1°C | 16.5°C | 12.8°C | 25.4°C | 7.8°C | 32 mm | 73% | 2 m/s | 3.6 |
| 1991 | 17.7°C | 14.7°C | 11.7°C | 24.3°C | 6.8°C | 69 mm | 78% | 2.3 m/s | 3 |
| 1990 | 19.3°C | 15.5°C | 11.6°C | 25.0°C | 8.3°C | 52 mm | 76% | 2.1 m/s | 3.6 |
| 1989 | 19.7°C | 15.8°C | 11.9°C | 26.5°C | 5.7°C | 61 mm | 74% | 2.2 m/s | 3.9 |
| 1988 | 17.1°C | 14.1°C | 11.0°C | 23.0°C | 7.5°C | 54 mm | 75% | 2.5 m/s | 3.5 |
| 1987 | 17.9°C | 15.1°C | 12.3°C | 24.9°C | 7.3°C | 85 mm | 77% | 2.5 m/s | 3.7 |
| 1986 ❄️ | 16.2°C | 12.9°C | 9.6°C | 24.0°C | 6.7°C | 54 mm | 73% | 2.4 m/s | 3.7 |
| 1985 | 18.7°C | 15.3°C | 11.8°C | 24.2°C | 9.1°C | 24 mm | 76% | 2.1 m/s | 4 |
| 1984 | 16.7°C | 13.9°C | 11.0°C | 21.8°C | 6.7°C | 117 mm | 81% | 2.4 m/s | 3.9 |
| 1983 | 18.4°C | 15.7°C | 13.0°C | 24.4°C | 8.3°C | 113 mm | 82% | 2.1 m/s | — |
| 1982 | 17.7°C | 14.7°C | 11.7°C | 22.5°C | 7.0°C | 124 mm | 85% | 1.9 m/s | — |
| 1981 | 17.8°C | 15.2°C | 12.6°C | 23.1°C | 5.3°C | 109 mm | 82% | 2.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.8°C with lows near 12.5°C (mean 15.7°C), based on 45 years of NASA POWER data.
September averages 80 mm of rainfall in Inverness, about average for rainfall. The wettest on record was 171 mm in 2012.
The hottest September reached 27.9°C in 2001. The coldest dipped to 5.2°C in 2000.
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 17.9°C to 20.1°C and overnight lows from 12°C to 13.8°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 18.8°C daytime highs and 12.5°C at night.
Not quite — September is the 10th coolest month in Inverness, averaging 15.7°C.
For September in Inverness, pack light layers you can adjust through the day, with typical highs of 18.8°C and lows of 12.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 2.2 m/s. The windiest September on record averaged 2.6 m/s (1981).
The wettest September on record was 2012 with 171 mm. On average, September sees 80 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.
