September is one of the cooler months of the year in Emerald, with average highs near 30°C and lows around 13.3°C (mean 21.7°C). It is one of the drier months, averaging 21 mm of rainfall and 50% relative humidity across the period.
September is one of the cooler months of the year in Emerald. Across 45 years of records, the warmest September in Emerald was 2013 — when the month averaged 24.8°C — while the coldest was 1984 at 19°C. Typical September days reach 30°C with nights near 13.3°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Emerald, averaging 21 mm of rainfall. The wettest September on record was 2010 with 226 mm, while the driest were 2017, 2019 and 2023, among others at 0 mm.
Relative humidity in Emerald during September averages 50%. The most humid September was 1998 at 76%, and the least humid was 1991 at 34%.
September receives about 6.1 kWh/m²/day of solar energy in Emerald. The sunniest Septembers were 1991, 2017 and 2019 at 6.7 kWh/m²/day, and the cloudiest was 2010 at 4.4.
Average wind speed in Emerald during September is 2.6 m/s. The windiest Septembers were 1999, 2020 and 2021, among others at 3 m/s, while the calmest was 1984 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.9°C | 21.5°C | 22.0°C | 21.7°C | 22.3°C | +1.4°C |
| Avg High | 29.4°C | 29.8°C | 30.6°C | 29.9°C | 30.6°C | +1.2°C |
| Avg Low | 12.4°C | 13.1°C | 13.5°C | 13.6°C | 14.1°C | +1.7°C |
| Avg Rain | 16 mm | 25 mm | 13 mm | 37 mm | 11 mm | -5 mm |
September temperatures in Emerald have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.3°C (1985) to a record high of 41.2°C (2013).
Rainfall in September is one of the drier months, averaging 21 mm, with a wettest year of 226 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Emerald
September is one of the best times to visit Emerald. Expect days averaging 30°C and nights around 13.3°C (mean 21.7°C) — cooler than Emerald's yearly average — with low rainfall (21 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 | 30.8°C | 22.5°C | 14.2°C | 36.0°C | 10.4°C | 6 mm | 50% | 2.6 m/s | 6.2 |
| 2024 | 31.1°C | 22.8°C | 14.5°C | 35.3°C | 12.1°C | 1 mm | 47% | 2.7 m/s | 6.2 |
| 2023 | 31.5°C | 22.9°C | 14.4°C | 36.4°C | 11.9°C | 0 mm | 45% | 2.8 m/s | 6.5 |
| 2022 | 28.8°C | 21.1°C | 13.4°C | 34.4°C | 8.7°C | 41 mm | 60% | 2.4 m/s | 5.4 |
| 2021 | 30.2°C | 21.5°C | 12.8°C | 34.9°C | 7.7°C | 10 mm | 47% | 3 m/s | 6.3 |
| 2020 | 30.9°C | 22.9°C | 15.0°C | 35.6°C | 11.5°C | 7 mm | 52% | 3 m/s | 5.8 |
| 2019 | 31.6°C | 22.4°C | 13.2°C | 36.0°C | 7.1°C | 0 mm | 35% | 2.4 m/s | 6.7 |
| 2018 | 30.8°C | 22.4°C | 14.1°C | 34.1°C | 10.4°C | 1 mm | 46% | 2.8 m/s | 6.4 |
| 2017 | 32.9°C | 23.3°C | 13.8°C | 40.1°C | 9.1°C | 0 mm | 38% | 2.5 m/s | 6.7 |
| 2016 | 28.5°C | 21.3°C | 14.0°C | 32.1°C | 8.5°C | 44 mm | 65% | 2.8 m/s | 5.1 |
| 2015 | 28.6°C | 20.7°C | 12.8°C | 32.7°C | 8.1°C | 1 mm | 50% | 2.5 m/s | 6.2 |
| 2014 | 28.1°C | 20.2°C | 12.3°C | 31.8°C | 6.5°C | 86 mm | 58% | 2.4 m/s | 5.8 |
| 2013 🔥 | 33.8°C | 24.8°C | 15.8°C | 41.2°C | 10.5°C | 2 mm | 39% | 2.6 m/s | 6.4 |
| 2012 | 29.2°C | 21.0°C | 12.9°C | 36.7°C | 7.1°C | 7 mm | 57% | 2.4 m/s | 6 |
| 2011 | 28.6°C | 20.2°C | 11.8°C | 34.1°C | 6.2°C | 0 mm | 55% | 2.8 m/s | 6.2 |
| 2010 🌧️ | 26.8°C | 20.9°C | 14.9°C | 33.2°C | 10.4°C | 226 mm | 75% | 2.4 m/s | 4.4 |
| 2009 | 32.0°C | 23.2°C | 14.3°C | 37.6°C | 10.8°C | 1 mm | 40% | 2.6 m/s | 6.5 |
| 2008 | 29.5°C | 21.9°C | 14.3°C | 35.9°C | 9.4°C | 44 mm | 62% | 2.5 m/s | 5.9 |
| 2007 | 28.9°C | 20.7°C | 12.5°C | 35.3°C | 9.5°C | 51 mm | 60% | 2.3 m/s | 5.9 |
| 2006 | 29.1°C | 21.3°C | 13.6°C | 34.0°C | 7.6°C | 8 mm | 55% | 2.9 m/s | 6.1 |
| 2005 | 31.1°C | 22.5°C | 13.9°C | 37.4°C | 8.5°C | 4 mm | 49% | 2.6 m/s | 6.2 |
| 2004 | 29.7°C | 21.2°C | 12.7°C | 35.2°C | 6.8°C | 9 mm | 47% | 2.5 m/s | 6.5 |
| 2003 | 32.0°C | 22.9°C | 13.8°C | 37.7°C | 6.2°C | 0 mm | 40% | 2.6 m/s | 6.6 |
| 2002 | 31.8°C | 22.5°C | 13.2°C | 37.5°C | 8.0°C | 0 mm | 42% | 2.7 m/s | 6.4 |
| 2001 | 30.3°C | 21.9°C | 13.4°C | 33.2°C | 8.9°C | 8 mm | 47% | 2.9 m/s | 6 |
| 2000 | 31.7°C | 22.4°C | 13.1°C | 38.7°C | 9.9°C | 0 mm | 44% | 2.6 m/s | 6.6 |
| 1999 | 29.9°C | 21.9°C | 13.8°C | 33.0°C | 9.1°C | 4 mm | 52% | 3 m/s | 6.2 |
| 1998 | 26.8°C | 20.7°C | 14.6°C | 31.1°C | 8.9°C | 89 mm | 76% | 2.7 m/s | 5.3 |
| 1997 | 32.0°C | 23.5°C | 15.0°C | 38.3°C | 9.0°C | 16 mm | 44% | 2.6 m/s | 6 |
| 1996 | 30.9°C | 21.3°C | 11.7°C | 36.6°C | 5.2°C | 60 mm | 42% | 2.6 m/s | 6.4 |
| 1995 | 30.3°C | 21.8°C | 13.2°C | 34.1°C | 4.4°C | 7 mm | 48% | 2.8 m/s | 5.9 |
| 1994 | 30.3°C | 21.2°C | 12.1°C | 35.5°C | 7.9°C | 1 mm | 37% | 2.5 m/s | 6.4 |
| 1993 | 27.5°C | 20.1°C | 12.8°C | 35.4°C | 8.2°C | 53 mm | 61% | 3 m/s | 5.6 |
| 1992 | 31.0°C | 22.3°C | 13.6°C | 35.7°C | 9.4°C | 15 mm | 43% | 2.7 m/s | 5.9 |
| 1991 | 31.6°C | 22.2°C | 12.8°C | 36.7°C | 7.8°C | 1 mm | 34% | 2.5 m/s | 6.7 |
| 1990 | 28.1°C | 19.9°C | 11.7°C | 32.4°C | 7.5°C | 4 mm | 50% | 2.7 m/s | 6.1 |
| 1989 | 30.2°C | 21.0°C | 11.8°C | 37.1°C | 7.0°C | 4 mm | 45% | 2.4 m/s | 6.5 |
| 1988 | 29.6°C | 21.1°C | 12.7°C | 40.5°C | 8.0°C | 0 mm | 55% | 2.9 m/s | 6.1 |
| 1987 | 29.6°C | 21.1°C | 12.5°C | 33.4°C | 7.2°C | 5 mm | 47% | 2.5 m/s | 6 |
| 1986 | 30.1°C | 21.4°C | 12.8°C | 36.4°C | 6.0°C | 44 mm | 49% | 2.9 m/s | 6.1 |
| 1985 | 28.7°C | 19.8°C | 10.9°C | 35.8°C | 4.3°C | 11 mm | 44% | 2.8 m/s | 6.2 |
| 1984 ❄️ | 27.3°C | 19.0°C | 10.7°C | 31.1°C | 5.4°C | 55 mm | 55% | 2.1 m/s | 6.2 |
| 1983 | 30.0°C | 22.0°C | 14.1°C | 34.4°C | 9.1°C | 12 mm | 64% | 2.4 m/s | — |
| 1982 | 29.5°C | 21.1°C | 12.7°C | 37.6°C | 7.7°C | 10 mm | 46% | 2.5 m/s | — |
| 1981 | 29.9°C | 21.8°C | 13.7°C | 37.3°C | 5.8°C | 0 mm | 49% | 2.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30°C with lows near 13.3°C (mean 21.7°C), based on 45 years of NASA POWER data.
September averages 21 mm of rainfall in Emerald, one of the drier months. The wettest on record was 226 mm in 2010.
The hottest September reached 41.2°C in 2013. The coldest dipped to 4.3°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 29.1°C to 30.5°C and overnight lows from 12.4°C to 13.9°C over the same span.
September is one of the cooler months of the year in Emerald and one of the drier months, so plan for around 30°C daytime highs and 13.3°C at night.
Not quite — September is the 5th coolest month in Emerald, averaging 21.7°C.
For September in Emerald, pack light, breathable clothing and sun protection, with typical highs of 30°C and lows of 13.3°C.
Relative humidity in September averages 50% — relatively dry.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 3 m/s (1993).
The wettest September on record was 2010 with 226 mm. On average, September sees 21 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 Emerald 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.
