September is one of the cooler months of the year in Cooma, with average highs near 15.3°C and lows around 3.4°C (mean 9.4°C). It is one of the drier months, averaging 51 mm of rainfall and 72% relative humidity across the period.
September is one of the cooler months of the year in Cooma. Across 45 years of records, the warmest September in Cooma was 2023 — when the month averaged 12.5°C — while the coldest was 1992 at 6.6°C. Typical September days reach 15.3°C with nights near 3.4°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Cooma, averaging 51 mm of rainfall. The wettest September on record was 1985 with 109 mm, while the driest was 2018 at 9 mm.
Relative humidity in Cooma during September averages 72%. The most humid September was 1997 at 81%, and the least humid was 2017 at 56%.
September receives about 4.6 kWh/m²/day of solar energy in Cooma. The sunniest September was 2023 at 5.3 kWh/m²/day, and the cloudiest was 2022 at 3.9.
Average wind speed in Cooma during September is 1.1 m/s. The windiest Septembers were 1996 and 2003 at 1.5 m/s, while the calmest were 2005, 2015 and 2022, among others at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.7°C | 8.6°C | 9.9°C | 9.6°C | 10.2°C | +1.5°C |
| Avg High | 14.6°C | 14.2°C | 16.0°C | 15.7°C | 16.3°C | +1.7°C |
| Avg Low | 2.8°C | 3.0°C | 3.8°C | 3.5°C | 4.1°C | +1.3°C |
| Avg Rain | 58 mm | 65 mm | 49 mm | 40 mm | 36 mm | -21 mm |
September temperatures in Cooma have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -3.1°C (2013) to a record high of 28.3°C (2017).
Rainfall in September is one of the drier months, averaging 51 mm, with a wettest year of 109 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A quieter season to visit Cooma
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Cooma. That said, September — with days averaging 15.3°C and nights around 3.4°C (mean 9.4°C) and moderate rainfall (51 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.9°C | 9.9°C | 3.8°C | 20.7°C | -0.6°C | 49 mm | 68% | 1.2 m/s | 4.9 |
| 2024 | 16.4°C | 10.2°C | 4.0°C | 21.8°C | -1.9°C | 32 mm | 64% | 1.4 m/s | 4.8 |
| 2023 🔥 | 19.8°C | 12.5°C | 5.2°C | 27.2°C | -0.7°C | 16 mm | 59% | 1 m/s | 5.3 |
| 2022 | 13.9°C | 9.1°C | 4.3°C | 17.6°C | -2.4°C | 53 mm | 81% | 0.9 m/s | 3.9 |
| 2021 | 15.3°C | 9.4°C | 3.4°C | 21.0°C | -1.3°C | 50 mm | 70% | 1.2 m/s | 4.6 |
| 2020 | 16.3°C | 10.3°C | 4.2°C | 22.5°C | -1.8°C | 16 mm | 72% | 1.1 m/s | 4.6 |
| 2019 | 17.0°C | 10.1°C | 3.3°C | 22.1°C | -0.9°C | 30 mm | 65% | 1.1 m/s | 4.6 |
| 2018 | 16.9°C | 9.9°C | 2.9°C | 22.3°C | -1.2°C | 9 mm | 60% | 1 m/s | 4.9 |
| 2017 | 16.6°C | 9.9°C | 3.2°C | 28.3°C | -1.5°C | 9 mm | 56% | 1.4 m/s | 5.2 |
| 2016 | 14.9°C | 9.4°C | 4.0°C | 21.0°C | 1.0°C | 60 mm | 78% | 1 m/s | 4 |
| 2015 | 14.7°C | 9.0°C | 3.2°C | 20.4°C | -1.4°C | 17 mm | 76% | 0.9 m/s | 4.5 |
| 2014 | 15.1°C | 9.3°C | 3.5°C | 21.7°C | -1.6°C | 40 mm | 76% | 1 m/s | 4.7 |
| 2013 | 16.5°C | 10.8°C | 5.0°C | 22.4°C | -3.1°C | 107 mm | 73% | 1.1 m/s | 4.3 |
| 2012 | 15.1°C | 9.2°C | 3.2°C | 20.9°C | -1.8°C | 39 mm | 72% | 1.1 m/s | 4.8 |
| 2011 | 15.5°C | 9.4°C | 3.3°C | 22.0°C | -1.4°C | 39 mm | 71% | 1.1 m/s | 4.6 |
| 2010 | 14.7°C | 8.9°C | 3.2°C | 20.1°C | -2.1°C | 51 mm | 75% | 1 m/s | 4.7 |
| 2009 | 16.8°C | 10.5°C | 4.2°C | 22.6°C | 0.4°C | 58 mm | 66% | 1.2 m/s | 4.8 |
| 2008 | 16.7°C | 10.1°C | 3.5°C | 24.4°C | -2.5°C | 26 mm | 64% | 1.1 m/s | 5 |
| 2007 | 14.9°C | 8.9°C | 3.0°C | 19.1°C | -1.9°C | 23 mm | 71% | 1.1 m/s | 4.8 |
| 2006 | 16.9°C | 10.7°C | 4.5°C | 22.4°C | 0.1°C | 39 mm | 66% | 1.2 m/s | 4.8 |
| 2005 | 15.1°C | 9.4°C | 3.7°C | 22.0°C | -1.5°C | 77 mm | 76% | 0.9 m/s | 4.2 |
| 2004 | 16.2°C | 9.8°C | 3.4°C | 24.4°C | -1.6°C | 55 mm | 72% | 1 m/s | 4.2 |
| 2003 | 14.8°C | 8.6°C | 2.4°C | 23.5°C | -2.6°C | 34 mm | 66% | 1.5 m/s | 5.1 |
| 2002 | 16.2°C | 9.9°C | 3.6°C | 23.2°C | -1.6°C | 40 mm | 61% | 1.3 m/s | 4.8 |
| 2001 | 16.3°C | 10.8°C | 5.2°C | 23.1°C | 1.2°C | 54 mm | 77% | 0.9 m/s | 4.2 |
| 2000 | 16.2°C | 10.1°C | 4.0°C | 22.9°C | -1.4°C | 84 mm | 72% | 1.2 m/s | 4.6 |
| 1999 | 16.3°C | 10.5°C | 4.7°C | 21.5°C | -1.3°C | 58 mm | 74% | 1 m/s | 4.4 |
| 1998 | 15.4°C | 10.2°C | 5.0°C | 21.5°C | -1.0°C | 38 mm | 79% | 1 m/s | 4.6 |
| 1997 | 13.4°C | 8.5°C | 3.5°C | 17.7°C | -2.3°C | 91 mm | 81% | 0.9 m/s | 4.2 |
| 1996 | 14.0°C | 8.4°C | 2.9°C | 21.6°C | -0.9°C | 86 mm | 71% | 1.5 m/s | 4.7 |
| 1995 | 14.5°C | 8.8°C | 3.1°C | 19.9°C | -2.8°C | 62 mm | 75% | 1 m/s | 4.3 |
| 1994 | 14.7°C | 8.0°C | 1.4°C | 21.2°C | -2.4°C | 20 mm | 62% | 1.2 m/s | 4.9 |
| 1993 | 14.5°C | 8.9°C | 3.2°C | 21.1°C | 0.0°C | 79 mm | 76% | 1 m/s | 4.4 |
| 1992 ❄️ | 12.0°C | 6.6°C | 1.3°C | 17.8°C | -2.6°C | 107 mm | 78% | 1.1 m/s | 4.2 |
| 1991 | 13.3°C | 7.7°C | 2.2°C | 18.1°C | -2.6°C | 43 mm | 76% | 1.2 m/s | 4.8 |
| 1990 | 13.5°C | 8.2°C | 2.9°C | 21.8°C | -1.3°C | 69 mm | 80% | 1 m/s | 4.5 |
| 1989 | 13.9°C | 7.8°C | 1.7°C | 20.3°C | -1.4°C | 23 mm | 77% | 1.1 m/s | 4.7 |
| 1988 | 14.4°C | 9.1°C | 3.9°C | 19.4°C | -1.2°C | 88 mm | 78% | 1.1 m/s | 4.5 |
| 1987 | 16.4°C | 9.8°C | 3.1°C | 26.3°C | -1.8°C | 18 mm | 67% | 1.1 m/s | 4.8 |
| 1986 | 14.4°C | 8.9°C | 3.4°C | 21.1°C | 0.1°C | 47 mm | 76% | 1 m/s | 4.2 |
| 1985 🌧️ | 13.5°C | 8.0°C | 2.5°C | 20.4°C | -1.3°C | 109 mm | 79% | 0.9 m/s | 4.4 |
| 1984 | 12.3°C | 7.2°C | 2.0°C | 18.6°C | -1.6°C | 94 mm | 80% | 1 m/s | 4.1 |
| 1983 | 14.5°C | 8.6°C | 2.7°C | 20.0°C | -1.8°C | 60 mm | 76% | 1.2 m/s | — |
| 1982 | 14.5°C | 8.4°C | 2.2°C | 22.1°C | -3.0°C | 60 mm | 67% | 1.1 m/s | — |
| 1981 | 17.4°C | 10.6°C | 3.8°C | 24.3°C | -0.1°C | 18 mm | 71% | 1.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.3°C with lows near 3.4°C (mean 9.4°C), based on 45 years of NASA POWER data.
September averages 51 mm of rainfall in Cooma, one of the drier months. The wettest on record was 109 mm in 1985.
The hottest September reached 28.3°C in 2017. The coldest dipped to -3.1°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 14.4°C to 16.3°C and overnight lows from 2.6°C to 4.1°C over the same span.
September is one of the cooler months of the year in Cooma and one of the drier months, so plan for around 15.3°C daytime highs and 3.4°C at night.
Not quite — September is the 4th coolest month in Cooma, averaging 9.4°C.
For September in Cooma, pack warm layers and a jacket for chilly mornings, with typical highs of 15.3°C and lows of 3.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — moderately humid.
Average wind speed in September is 1.1 m/s. The windiest September on record averaged 1.5 m/s (1996).
The wettest September on record was 1985 with 109 mm. On average, September sees 51 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 Cooma 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.
