September is one of the cooler months of the year in Glencoe, with average highs near 12.4°C and lows around 2.8°C (mean 7.6°C). It is about average for rainfall, averaging 92 mm of rainfall and 81% relative humidity across the period.
September is one of the cooler months of the year in Glencoe. Across 45 years of records, the warmest September in Glencoe was 1989 — when the month averaged 9.9°C — while the coldest was 1994 at 5.5°C. Typical September days reach 12.4°C with nights near 2.8°C. The long-term September temperature trend is broadly flat.
September is about average for rainfall in Glencoe, averaging 92 mm of rainfall. The wettest September on record was 2010 with 164 mm, while the driest was 1989 at 18 mm.
Relative humidity in Glencoe during September averages 81%. The most humid September was 1983 at 84%, and the least humid was 1989 at 77%.
September receives about 3.2 kWh/m²/day of solar energy in Glencoe. The sunniest September was 1985 at 3.8 kWh/m²/day, and the cloudiest were 1995, 2010 and 2020 at 2.9.
Average wind speed in Glencoe during September is 3.2 m/s. The windiest September was 1981 at 4.4 m/s, while the calmest were 1984 and 1989 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.8°C | 7.1°C | 7.9°C | 7.7°C | 7.7°C | -0.1°C |
| Avg High | 12.8°C | 11.9°C | 12.7°C | 12.5°C | 12.3°C | -0.5°C |
| Avg Low | 2.9°C | 2.3°C | 3.1°C | 2.9°C | 3.0°C | +0.1°C |
| Avg Rain | 90 mm | 75 mm | 90 mm | 92 mm | 126 mm | +35 mm |
September temperatures in Glencoe have stayed relatively stable across the record.
September has ranged from a record low of -3.8°C (1997) to a record high of 21.2°C (2008).
Rainfall in September is about average for rainfall, averaging 92 mm, with a wettest year of 164 mm.
A good time to visit Glencoe
September is a good time to visit Glencoe, with days averaging 12.4°C and nights around 2.8°C (mean 7.6°C, cooler than Glencoe's yearly average) and higher rainfall. February and January 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 | 11.5°C | 7.0°C | 2.6°C | 16.4°C | -1.7°C | 155 mm | 80% | 4.3 m/s | 3.1 |
| 2024 | 11.6°C | 7.3°C | 3.0°C | 17.7°C | 0.0°C | 150 mm | 82% | 3.9 m/s | 3 |
| 2023 | 13.4°C | 8.6°C | 3.8°C | 20.2°C | -0.7°C | 138 mm | 81% | 3.7 m/s | 3.2 |
| 2022 | 13.0°C | 8.2°C | 3.3°C | 20.8°C | -2.3°C | 60 mm | 82% | 2.3 m/s | 3.3 |
| 2021 | 12.3°C | 7.4°C | 2.5°C | 18.4°C | -1.8°C | 120 mm | 81% | 3.6 m/s | 3.1 |
| 2020 | 11.7°C | 7.4°C | 3.0°C | 16.8°C | -2.8°C | 129 mm | 83% | 3.6 m/s | 2.9 |
| 2019 | 12.0°C | 7.3°C | 2.5°C | 17.9°C | -2.8°C | 72 mm | 82% | 3.6 m/s | 3.4 |
| 2018 | 13.2°C | 8.0°C | 2.8°C | 18.7°C | -0.4°C | 79 mm | 82% | 2.6 m/s | 3.4 |
| 2017 | 12.8°C | 8.1°C | 3.3°C | 19.8°C | -1.4°C | 100 mm | 83% | 2.8 m/s | 3.2 |
| 2016 | 14.6°C | 9.2°C | 3.7°C | 18.5°C | -1.2°C | 46 mm | 81% | 2.5 m/s | 3.3 |
| 2015 | 11.5°C | 6.7°C | 1.8°C | 18.1°C | -2.5°C | 60 mm | 82% | 3.1 m/s | 3.3 |
| 2014 | 13.1°C | 7.8°C | 2.6°C | 20.1°C | 0.2°C | 66 mm | 81% | 2.6 m/s | 3.3 |
| 2013 | 12.4°C | 7.7°C | 3.0°C | 17.5°C | -1.7°C | 104 mm | 81% | 3.1 m/s | 3.1 |
| 2012 | 12.7°C | 8.3°C | 3.8°C | 19.5°C | -1.0°C | 120 mm | 80% | 3.1 m/s | 3.1 |
| 2011 | 11.4°C | 7.0°C | 2.6°C | 19.9°C | -0.6°C | 112 mm | 83% | 3.4 m/s | 3.2 |
| 2010 🌧️ | 10.9°C | 6.7°C | 2.4°C | 17.7°C | -1.2°C | 164 mm | 83% | 4 m/s | 2.9 |
| 2009 | 12.7°C | 7.7°C | 2.8°C | 19.2°C | -2.7°C | 74 mm | 81% | 3.1 m/s | 3 |
| 2008 | 13.0°C | 8.3°C | 3.6°C | 21.2°C | -1.6°C | 119 mm | 81% | 3.3 m/s | 3 |
| 2007 | 13.2°C | 8.0°C | 2.9°C | 18.6°C | -1.7°C | 79 mm | 81% | 2.7 m/s | 3.2 |
| 2006 | 13.1°C | 8.4°C | 3.7°C | 19.5°C | 1.1°C | 113 mm | 81% | 3.8 m/s | 3.3 |
| 2005 | 13.7°C | 8.6°C | 3.4°C | 20.1°C | -0.9°C | 67 mm | 82% | 2.7 m/s | 3.2 |
| 2004 | 10.5°C | 6.6°C | 2.7°C | 15.6°C | -1.8°C | 93 mm | 82% | 3.7 m/s | 3 |
| 2003 | 11.3°C | 6.4°C | 1.4°C | 16.6°C | -1.6°C | 106 mm | 82% | 3.2 m/s | 3.1 |
| 2002 | 12.4°C | 7.8°C | 3.2°C | 17.1°C | -2.1°C | 118 mm | 81% | 4.1 m/s | 3 |
| 2001 | 14.7°C | 9.4°C | 4.1°C | 19.8°C | -0.7°C | 68 mm | 79% | 3.2 m/s | 3.2 |
| 2000 | 12.6°C | 7.7°C | 2.8°C | 16.7°C | -2.2°C | 65 mm | 80% | 3.4 m/s | 3.2 |
| 1999 | 13.2°C | 8.2°C | 3.3°C | 17.9°C | -1.2°C | 69 mm | 82% | 3 m/s | 3.1 |
| 1998 | 12.4°C | 7.8°C | 3.2°C | 16.9°C | -2.0°C | 112 mm | 81% | 4 m/s | 3.1 |
| 1997 | 10.7°C | 5.9°C | 1.1°C | 16.9°C | -3.8°C | 41 mm | 81% | 2.3 m/s | 3.3 |
| 1996 | 14.7°C | 9.2°C | 3.7°C | 20.8°C | -1.9°C | 57 mm | 77% | 2.5 m/s | 3.2 |
| 1995 | 11.1°C | 6.5°C | 2.0°C | 16.9°C | -0.9°C | 138 mm | 84% | 3.3 m/s | 2.9 |
| 1994 ❄️ | 9.4°C | 5.5°C | 1.5°C | 15.7°C | -2.0°C | 118 mm | 84% | 3.2 m/s | 3.2 |
| 1993 | 11.0°C | 6.7°C | 2.4°C | 18.8°C | -1.6°C | 64 mm | 82% | 3.4 m/s | 3.2 |
| 1992 | 11.2°C | 5.8°C | 0.5°C | 17.7°C | -2.7°C | 50 mm | 82% | 2.3 m/s | 3.5 |
| 1991 | 12.6°C | 7.8°C | 3.0°C | 16.0°C | -0.1°C | 59 mm | 84% | 2.6 m/s | 3.2 |
| 1990 | 12.3°C | 7.3°C | 2.4°C | 17.6°C | -1.4°C | 46 mm | 81% | 3.1 m/s | 3.4 |
| 1989 🔥 | 15.7°C | 9.9°C | 4.1°C | 20.7°C | -2.7°C | 18 mm | 77% | 2.2 m/s | 3.6 |
| 1988 | 13.5°C | 8.7°C | 3.8°C | 20.1°C | -1.0°C | 100 mm | 82% | 3.3 m/s | 3 |
| 1987 | 11.4°C | 6.7°C | 2.1°C | 16.8°C | -1.3°C | 111 mm | 84% | 3.9 m/s | 3.1 |
| 1986 | 12.3°C | 7.4°C | 2.5°C | 18.3°C | -2.8°C | 80 mm | 81% | 3.2 m/s | 3.6 |
| 1985 | 13.8°C | 8.6°C | 3.5°C | 20.0°C | -2.2°C | 67 mm | 79% | 3.1 m/s | 3.8 |
| 1984 | 13.8°C | 8.1°C | 2.5°C | 18.4°C | -1.5°C | 98 mm | 80% | 2.2 m/s | 3.6 |
| 1983 | 11.2°C | 7.0°C | 2.8°C | 18.4°C | -1.4°C | 109 mm | 84% | 3.6 m/s | — |
| 1982 | 12.5°C | 7.5°C | 2.5°C | 19.1°C | -2.0°C | 80 mm | 82% | 2.5 m/s | — |
| 1981 | 10.9°C | 6.6°C | 2.4°C | 15.2°C | -1.0°C | 148 mm | 83% | 4.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 12.4°C with lows near 2.8°C (mean 7.6°C), based on 45 years of NASA POWER data.
September averages 92 mm of rainfall in Glencoe, about average for rainfall. The wettest on record was 164 mm in 2010.
The hottest September reached 21.2°C in 2008. The coldest dipped to -3.8°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.1°C. Daytime highs moved from 12.4°C to 12.4°C and overnight lows from 2.7°C to 3°C over the same span.
September is one of the cooler months of the year in Glencoe and about average for rainfall, so plan for around 12.4°C daytime highs and 2.8°C at night.
Not quite — September is the 5th coolest month in Glencoe, averaging 7.6°C.
For September in Glencoe, pack warm layers and a jacket for chilly mornings, with typical highs of 12.4°C and lows of 2.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 3.2 m/s. The windiest September on record averaged 4.4 m/s (1981).
The wettest September on record was 2010 with 164 mm. On average, September sees 92 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 Glencoe 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.
