September is one of the cooler months of the year in Caloundra, with average highs near 22.7°C and lows around 16.1°C (mean 19.4°C). It is one of the drier months, averaging 43 mm of rainfall and 69% relative humidity across the period.
September is one of the cooler months of the year in Caloundra. Across 45 years of records, the warmest September in Caloundra was 2017 — when the month averaged 21.1°C — while the coldest were 1989 and 1990 at 17.6°C. Typical September days reach 22.7°C with nights near 16.1°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Caloundra, averaging 43 mm of rainfall. The wettest September on record was 1998 with 143 mm, while the driest was 2000 at 2 mm.
Relative humidity in Caloundra during September averages 69%. The most humid September was 1983 at 80%, and the least humid was 1991 at 55%.
September receives about 5.5 kWh/m²/day of solar energy in Caloundra. The sunniest September was 2019 at 6.1 kWh/m²/day, and the cloudiest was 2010 at 4.4.
Average wind speed in Caloundra during September is 3.1 m/s. The windiest September was 2002 at 3.5 m/s, while the calmest were 1981 and 1987 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.6°C | 19.0°C | 19.7°C | 19.7°C | 20.0°C | +1.4°C |
| Avg High | 21.9°C | 22.3°C | 23.1°C | 23.0°C | 23.1°C | +1.2°C |
| Avg Low | 15.3°C | 15.7°C | 16.3°C | 16.4°C | 16.8°C | +1.5°C |
| Avg Rain | 42 mm | 52 mm | 43 mm | 43 mm | 28 mm | -13 mm |
September temperatures in Caloundra have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 9°C (1987) to a record high of 31.9°C (2017).
Rainfall in September is one of the drier months, averaging 43 mm, with a wettest year of 143 mm.
One of the best times to visit Caloundra
September is one of the best times to visit Caloundra. Expect days averaging 22.7°C and nights around 16.1°C (mean 19.4°C) — cooler than Caloundra's yearly average — with moderate rainfall (43 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 | 23.4°C | 20.1°C | 16.9°C | 26.1°C | 13.8°C | 10 mm | 71% | 2.8 m/s | 5.6 |
| 2024 | 24.2°C | 20.8°C | 17.3°C | 28.9°C | 14.6°C | 37 mm | 69% | 3.3 m/s | 5.5 |
| 2023 | 23.5°C | 20.4°C | 17.3°C | 28.5°C | 15.5°C | 28 mm | 69% | 3.2 m/s | 5.6 |
| 2022 | 22.0°C | 19.1°C | 16.1°C | 25.5°C | 13.4°C | 57 mm | 74% | 3 m/s | 4.7 |
| 2021 | 22.7°C | 19.3°C | 15.8°C | 26.7°C | 12.7°C | 13 mm | 66% | 3.4 m/s | 5.6 |
| 2020 | 22.9°C | 20.1°C | 17.3°C | 26.8°C | 13.4°C | 24 mm | 70% | 3.2 m/s | 5.5 |
| 2019 | 24.1°C | 20.3°C | 16.4°C | 29.3°C | 13.0°C | 11 mm | 63% | 3.1 m/s | 6.1 |
| 2018 | 22.5°C | 19.5°C | 16.5°C | 25.7°C | 14.3°C | 56 mm | 69% | 3.3 m/s | 5.5 |
| 2017 🔥 | 25.2°C | 21.1°C | 16.9°C | 31.9°C | 13.1°C | 5 mm | 61% | 3.3 m/s | 6 |
| 2016 | 23.2°C | 20.0°C | 16.9°C | 26.7°C | 13.7°C | 51 mm | 69% | 3.2 m/s | 5.1 |
| 2015 | 21.7°C | 18.6°C | 15.5°C | 25.1°C | 11.2°C | 78 mm | 71% | 3.2 m/s | 5.4 |
| 2014 | 21.9°C | 18.9°C | 15.8°C | 25.2°C | 12.2°C | 35 mm | 69% | 3 m/s | 5.7 |
| 2013 | 24.4°C | 21.0°C | 17.6°C | 28.9°C | 15.0°C | 34 mm | 69% | 3.1 m/s | 5.6 |
| 2012 | 22.3°C | 19.0°C | 15.8°C | 26.4°C | 11.7°C | 27 mm | 71% | 2.8 m/s | 5.5 |
| 2011 | 22.1°C | 18.6°C | 15.2°C | 25.8°C | 11.4°C | 24 mm | 66% | 3.1 m/s | 5.8 |
| 2010 | 22.3°C | 19.8°C | 17.3°C | 24.4°C | 14.2°C | 113 mm | 75% | 2.8 m/s | 4.4 |
| 2009 | 23.7°C | 20.1°C | 16.5°C | 27.8°C | 13.1°C | 49 mm | 66% | 2.8 m/s | 6 |
| 2008 | 22.0°C | 19.2°C | 16.5°C | 27.8°C | 13.7°C | 72 mm | 77% | 3.4 m/s | 5.3 |
| 2007 | 21.6°C | 18.7°C | 15.8°C | 25.5°C | 13.9°C | 104 mm | 77% | 3.2 m/s | 5.5 |
| 2006 | 21.6°C | 19.1°C | 16.5°C | 24.9°C | 13.4°C | 96 mm | 75% | 3.2 m/s | 5.4 |
| 2005 | 23.0°C | 19.6°C | 16.2°C | 26.6°C | 12.2°C | 30 mm | 68% | 3.2 m/s | 5.8 |
| 2004 | 22.9°C | 19.5°C | 16.0°C | 27.1°C | 12.6°C | 24 mm | 67% | 3.2 m/s | 5.7 |
| 2003 | 25.1°C | 20.9°C | 16.6°C | 29.1°C | 13.5°C | 7 mm | 60% | 3.1 m/s | 5.9 |
| 2002 | 23.9°C | 20.3°C | 16.6°C | 27.4°C | 12.7°C | 21 mm | 67% | 3.5 m/s | 5.8 |
| 2001 | 22.8°C | 19.5°C | 16.3°C | 26.1°C | 13.0°C | 22 mm | 68% | 3 m/s | 5.5 |
| 2000 | 24.2°C | 20.2°C | 16.2°C | 29.2°C | 13.9°C | 2 mm | 65% | 3.2 m/s | 6 |
| 1999 | 20.7°C | 18.5°C | 16.3°C | 22.8°C | 12.8°C | 71 mm | 78% | 3 m/s | 5.3 |
| 1998 🌧️ | 22.1°C | 19.9°C | 17.7°C | 25.2°C | 14.2°C | 143 mm | 77% | 3 m/s | 5 |
| 1997 | 23.0°C | 19.7°C | 16.3°C | 28.0°C | 13.1°C | 43 mm | 70% | 3.2 m/s | 5.1 |
| 1996 | 23.3°C | 18.9°C | 14.5°C | 26.5°C | 10.6°C | 52 mm | 65% | 3.2 m/s | 5.7 |
| 1995 | 23.0°C | 19.6°C | 16.1°C | 26.1°C | 9.0°C | 35 mm | 69% | 3.1 m/s | 5.4 |
| 1994 | 22.9°C | 18.8°C | 14.6°C | 28.8°C | 11.4°C | 19 mm | 61% | 3.2 m/s | 5.8 |
| 1993 | 21.2°C | 18.5°C | 15.8°C | 27.8°C | 12.4°C | 81 mm | 71% | 3.1 m/s | 5.1 |
| 1992 | 22.0°C | 18.5°C | 14.9°C | 26.7°C | 10.8°C | 51 mm | 68% | 3 m/s | 5.2 |
| 1991 | 24.4°C | 20.2°C | 15.9°C | 29.7°C | 11.6°C | 6 mm | 55% | 2.9 m/s | 6 |
| 1990 | 20.5°C | 17.6°C | 14.7°C | 24.0°C | 11.1°C | 23 mm | 69% | 3.3 m/s | 5.4 |
| 1989 ❄️ | 21.0°C | 17.6°C | 14.1°C | 25.1°C | 10.4°C | 17 mm | 72% | 3.2 m/s | 5.6 |
| 1988 | 21.6°C | 18.8°C | 15.9°C | 27.3°C | 12.0°C | 54 mm | 77% | 3.1 m/s | 5.4 |
| 1987 | 22.2°C | 18.7°C | 15.2°C | 26.2°C | 9.0°C | 4 mm | 66% | 2.7 m/s | 5.6 |
| 1986 | 22.8°C | 19.4°C | 16.1°C | 26.8°C | 12.2°C | 52 mm | 67% | 3.2 m/s | 5.3 |
| 1985 | 21.5°C | 18.1°C | 14.7°C | 26.1°C | 10.8°C | 75 mm | 70% | 3.1 m/s | 5.4 |
| 1984 | 21.8°C | 18.0°C | 14.1°C | 24.7°C | 10.9°C | 41 mm | 65% | 3.2 m/s | 5.5 |
| 1983 | 22.0°C | 19.2°C | 16.4°C | 25.1°C | 12.2°C | 45 mm | 80% | 2.9 m/s | — |
| 1982 | 21.6°C | 18.3°C | 14.9°C | 27.3°C | 11.0°C | 79 mm | 69% | 3.2 m/s | — |
| 1981 | 23.0°C | 19.7°C | 16.5°C | 29.5°C | 10.1°C | 8 mm | 67% | 2.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.7°C with lows near 16.1°C (mean 19.4°C), based on 45 years of NASA POWER data.
September averages 43 mm of rainfall in Caloundra, one of the drier months. The wettest on record was 143 mm in 1998.
The hottest September reached 31.9°C in 2017. The coldest dipped to 9°C in 1987.
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 22°C to 23.2°C and overnight lows from 15.3°C to 16.7°C over the same span.
September is one of the cooler months of the year in Caloundra and one of the drier months, so plan for around 22.7°C daytime highs and 16.1°C at night.
Not quite — September is the 4th coolest month in Caloundra, averaging 19.4°C.
For September in Caloundra, pack light layers you can adjust through the day, with typical highs of 22.7°C and lows of 16.1°C.
Relative humidity in September averages 69% — moderately humid.
Average wind speed in September is 3.1 m/s. The windiest September on record averaged 3.5 m/s (2002).
The wettest September on record was 1998 with 143 mm. On average, September sees 43 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 Caloundra 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.
