September is one of the cooler months of the year in Forster, with average highs near 20.9°C and lows around 13.1°C (mean 17°C). It is one of the drier months, averaging 53 mm of rainfall and 68% relative humidity across the period.
September is one of the cooler months of the year in Forster. Across 45 years of records, the warmest September in Forster was 2013 — when the month averaged 19.4°C — while the coldest was 1985 at 14.8°C. Typical September days reach 20.9°C with nights near 13.1°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Forster, averaging 53 mm of rainfall. The wettest September on record was 1982 with 191 mm, while the driest was 2017 at 1 mm.
Relative humidity in Forster during September averages 68%. The most humid September was 1998 at 80%, and the least humid was 2017 at 54%.
September receives about 4.9 kWh/m²/day of solar energy in Forster. The sunniest September was 2017 at 5.5 kWh/m²/day, and the cloudiest was 2022 at 4.2.
Average wind speed in Forster during September is 2.3 m/s. The windiest Septembers were 1989, 1996 and 2016, among others at 2.6 m/s, while the calmest were 2013, 2023 and 2025 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.3°C | 16.3°C | 17.5°C | 17.4°C | 17.7°C | +1.4°C |
| Avg High | 20.3°C | 20.1°C | 21.6°C | 21.4°C | 21.6°C | +1.3°C |
| Avg Low | 12.4°C | 12.6°C | 13.5°C | 13.4°C | 13.7°C | +1.3°C |
| Avg Rain | 70 mm | 56 mm | 56 mm | 43 mm | 36 mm | -34 mm |
September temperatures in Forster have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 6.7°C (1995) to a record high of 33.3°C (2003).
Rainfall in September is one of the drier months, averaging 53 mm, with a wettest year of 191 mm.
A good time to visit Forster
September is a good time to visit Forster, with days averaging 20.9°C and nights around 13.1°C (mean 17°C, cooler than Forster's yearly average) and moderate rainfall. December and November 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 | 21.5°C | 17.7°C | 13.8°C | 27.9°C | 10.8°C | 34 mm | 72% | 2 m/s | 5.1 |
| 2024 | 22.6°C | 18.3°C | 14.0°C | 28.3°C | 10.3°C | 37 mm | 62% | 2.3 m/s | 4.9 |
| 2023 | 23.4°C | 18.6°C | 13.7°C | 29.6°C | 10.6°C | 9 mm | 63% | 2 m/s | 5.2 |
| 2022 | 19.3°C | 16.4°C | 13.5°C | 23.2°C | 10.9°C | 77 mm | 75% | 2.4 m/s | 4.2 |
| 2021 | 21.4°C | 17.2°C | 13.0°C | 26.9°C | 10.2°C | 26 mm | 66% | 2.5 m/s | 5 |
| 2020 | 21.7°C | 17.8°C | 13.9°C | 27.7°C | 9.7°C | 34 mm | 69% | 2.2 m/s | 5.2 |
| 2019 | 21.9°C | 17.7°C | 13.5°C | 28.7°C | 11.1°C | 39 mm | 66% | 2.5 m/s | 5.1 |
| 2018 | 20.7°C | 17.0°C | 13.2°C | 28.1°C | 10.3°C | 56 mm | 68% | 2.4 m/s | 4.9 |
| 2017 | 23.6°C | 18.6°C | 13.7°C | 32.9°C | 9.6°C | 1 mm | 54% | 2.3 m/s | 5.5 |
| 2016 | 21.5°C | 17.7°C | 14.0°C | 24.2°C | 11.1°C | 31 mm | 68% | 2.6 m/s | 4.6 |
| 2015 | 19.8°C | 16.4°C | 12.9°C | 26.1°C | 9.9°C | 87 mm | 72% | 2.5 m/s | 4.8 |
| 2014 | 19.8°C | 16.3°C | 12.8°C | 28.1°C | 9.5°C | 41 mm | 72% | 2.3 m/s | 4.8 |
| 2013 🔥 | 24.0°C | 19.4°C | 14.9°C | 32.0°C | 11.8°C | 19 mm | 62% | 2 m/s | 5.3 |
| 2012 | 21.5°C | 17.0°C | 12.5°C | 28.8°C | 8.6°C | 20 mm | 65% | 2.1 m/s | 5.4 |
| 2011 | 19.9°C | 16.4°C | 12.8°C | 25.0°C | 9.1°C | 102 mm | 73% | 2.5 m/s | 4.9 |
| 2010 | 21.3°C | 17.5°C | 13.8°C | 26.6°C | 9.3°C | 29 mm | 69% | 2.2 m/s | 4.7 |
| 2009 | 22.5°C | 18.0°C | 13.5°C | 28.5°C | 9.5°C | 20 mm | 65% | 2.3 m/s | 5.2 |
| 2008 | 20.3°C | 16.8°C | 13.2°C | 27.2°C | 9.1°C | 126 mm | 75% | 2.4 m/s | 4.8 |
| 2007 | 20.1°C | 16.6°C | 13.1°C | 25.7°C | 10.8°C | 54 mm | 71% | 2.4 m/s | 4.9 |
| 2006 | 20.8°C | 17.2°C | 13.6°C | 29.0°C | 10.7°C | 134 mm | 74% | 2.4 m/s | 4.7 |
| 2005 | 20.9°C | 17.0°C | 13.1°C | 26.9°C | 10.3°C | 68 mm | 69% | 2.3 m/s | 4.8 |
| 2004 | 21.1°C | 17.2°C | 13.3°C | 31.2°C | 8.1°C | 81 mm | 69% | 2.1 m/s | 4.9 |
| 2003 | 22.7°C | 18.1°C | 13.5°C | 33.3°C | 9.5°C | 5 mm | 58% | 2.4 m/s | 5.2 |
| 2002 | 22.5°C | 18.1°C | 13.6°C | 32.5°C | 9.8°C | 28 mm | 63% | 2.3 m/s | 4.9 |
| 2001 | 21.3°C | 17.6°C | 13.9°C | 26.5°C | 11.4°C | 30 mm | 72% | 2.4 m/s | 4.9 |
| 2000 | 23.3°C | 18.7°C | 14.1°C | 32.6°C | 10.3°C | 14 mm | 63% | 2.1 m/s | 4.9 |
| 1999 | 19.6°C | 16.4°C | 13.3°C | 24.9°C | 9.6°C | 55 mm | 78% | 2.2 m/s | 4.7 |
| 1998 | 20.4°C | 17.2°C | 14.1°C | 26.8°C | 9.0°C | 124 mm | 80% | 2.4 m/s | 4.3 |
| 1997 | 20.0°C | 16.8°C | 13.5°C | 24.8°C | 10.1°C | 66 mm | 71% | 2.4 m/s | 4.3 |
| 1996 | 20.9°C | 16.7°C | 12.5°C | 29.2°C | 9.2°C | 37 mm | 66% | 2.6 m/s | 4.8 |
| 1995 | 19.7°C | 16.0°C | 12.4°C | 26.2°C | 6.7°C | 100 mm | 74% | 2.4 m/s | 4.3 |
| 1994 | 21.1°C | 16.4°C | 11.7°C | 25.5°C | 8.8°C | 18 mm | 58% | 2.4 m/s | 5.3 |
| 1993 | 19.5°C | 15.9°C | 12.4°C | 24.6°C | 8.7°C | 47 mm | 70% | 2.5 m/s | 4.9 |
| 1992 | 19.9°C | 15.5°C | 11.2°C | 26.8°C | 7.4°C | 25 mm | 63% | 2.4 m/s | 4.7 |
| 1991 | 21.8°C | 17.1°C | 12.4°C | 26.3°C | 8.1°C | 6 mm | 57% | 2.5 m/s | 5.4 |
| 1990 | 17.8°C | 15.0°C | 12.1°C | 22.9°C | 8.3°C | 84 mm | 77% | 2.5 m/s | 4.7 |
| 1989 | 18.9°C | 15.2°C | 11.5°C | 24.8°C | 8.1°C | 20 mm | 72% | 2.6 m/s | 5 |
| 1988 | 20.3°C | 16.9°C | 13.6°C | 25.3°C | 10.0°C | 152 mm | 77% | 2.3 m/s | 4.6 |
| 1987 | 20.5°C | 16.2°C | 11.9°C | 27.4°C | 7.3°C | 12 mm | 68% | 2.1 m/s | 5.4 |
| 1986 | 20.3°C | 16.5°C | 12.8°C | 26.3°C | 8.1°C | 80 mm | 71% | 2.2 m/s | 4.8 |
| 1985 ❄️ | 18.0°C | 14.8°C | 11.5°C | 23.5°C | 7.0°C | 82 mm | 76% | 2.2 m/s | 4.7 |
| 1984 | 19.6°C | 15.4°C | 11.1°C | 24.4°C | 9.3°C | 33 mm | 65% | 2.6 m/s | 5 |
| 1983 | 22.0°C | 17.6°C | 13.2°C | 28.5°C | 10.6°C | 50 mm | 68% | 2.1 m/s | — |
| 1982 🌧️ | 19.7°C | 15.9°C | 12.2°C | 28.3°C | 8.2°C | 191 mm | 66% | 2.5 m/s | — |
| 1981 | 23.0°C | 18.2°C | 13.4°C | 29.8°C | 8.1°C | 12 mm | 63% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.9°C with lows near 13.1°C (mean 17°C), based on 45 years of NASA POWER data.
September averages 53 mm of rainfall in Forster, one of the drier months. The wettest on record was 191 mm in 1982.
The hottest September reached 33.3°C in 2003. The coldest dipped to 6.7°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 20.5°C to 21.6°C and overnight lows from 12.3°C to 13.6°C over the same span.
September is one of the cooler months of the year in Forster and one of the drier months, so plan for around 20.9°C daytime highs and 13.1°C at night.
Not quite — September is the 4th coolest month in Forster, averaging 17°C.
For September in Forster, pack light layers you can adjust through the day, with typical highs of 20.9°C and lows of 13.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 2.6 m/s (1984).
The wettest September on record was 1982 with 191 mm. On average, September sees 53 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 Forster 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.
