September is one of the warmer months of the year in Katherine, with average highs near 36.9°C and lows around 20.9°C (mean 28.9°C). It is one of the drier months, averaging 7 mm of rainfall and 36% relative humidity across the period.
September is one of the warmer months of the year in Katherine. Across 45 years of records, the warmest September in Katherine was 1992 — when the month averaged 30.9°C — while the coldest was 1990 at 26.6°C. Typical September days reach 36.9°C with nights near 20.9°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Katherine, averaging 7 mm of rainfall. The wettest September on record was 1998 with 38 mm, while the driest were 2018, 2019 and 2023, among others at 0 mm.
Relative humidity in Katherine during September averages 36%. The most humid September was 2010 at 47%, and the least humid was 2014 at 29%.
September receives about 6.8 kWh/m²/day of solar energy in Katherine. The sunniest Septembers were 2006, 2014 and 2019, among others at 7.2 kWh/m²/day, and the cloudiest was 2016 at 5.9.
Average wind speed in Katherine during September is 3.3 m/s. The windiest September was 1990 at 4.1 m/s, while the calmest were 1992 and 2003 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.7°C | 28.8°C | 28.9°C | 28.7°C | 29.7°C | +1°C |
| Avg High | 36.7°C | 37.0°C | 37.0°C | 36.8°C | 37.3°C | +0.6°C |
| Avg Low | 20.7°C | 20.7°C | 20.8°C | 20.6°C | 22.1°C | +1.4°C |
| Avg Rain | 10 mm | 8 mm | 3 mm | 6 mm | 8 mm | -2 mm |
September temperatures in Katherine have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 11.9°C (2004) to a record high of 41.5°C (1989).
Rainfall in September is one of the drier months, averaging 7 mm, with a wettest year of 38 mm.
A good time to visit Katherine
September is a good time to visit Katherine, with days averaging 36.9°C and nights around 20.9°C (mean 28.9°C, warmer than Katherine's yearly average) and low rainfall. June and July 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 | 36.9°C | 29.2°C | 21.5°C | 40.6°C | 14.1°C | 10 mm | 37% | 3.1 m/s | 6.5 |
| 2024 | 37.2°C | 29.8°C | 22.4°C | 39.8°C | 20.3°C | 18 mm | 43% | 3.6 m/s | 6.4 |
| 2023 | 36.8°C | 28.6°C | 20.4°C | 39.3°C | 16.7°C | 0 mm | 37% | 3.9 m/s | 7 |
| 2022 | 37.9°C | 30.7°C | 23.5°C | 41.0°C | 17.3°C | 14 mm | 38% | 2.9 m/s | 6.5 |
| 2021 | 36.8°C | 29.3°C | 21.8°C | 40.3°C | 15.1°C | 0 mm | 40% | 3.5 m/s | 6.8 |
| 2020 | 38.1°C | 30.5°C | 22.8°C | 40.9°C | 18.8°C | 6 mm | 39% | 3.5 m/s | 6.8 |
| 2019 | 36.2°C | 27.3°C | 18.3°C | 39.6°C | 13.5°C | 0 mm | 36% | 3.7 m/s | 7.2 |
| 2018 | 37.0°C | 28.7°C | 20.3°C | 38.7°C | 17.3°C | 0 mm | 33% | 3.5 m/s | 7.1 |
| 2017 | 37.4°C | 29.2°C | 21.1°C | 40.3°C | 16.1°C | 0 mm | 35% | 3.2 m/s | 6.9 |
| 2016 | 37.1°C | 30.7°C | 24.2°C | 40.7°C | 20.0°C | 9 mm | 43% | 2.8 m/s | 5.9 |
| 2015 | 35.9°C | 27.4°C | 18.9°C | 37.6°C | 15.4°C | 0 mm | 30% | 3.4 m/s | 7 |
| 2014 | 37.1°C | 28.1°C | 19.1°C | 39.4°C | 14.2°C | 0 mm | 29% | 3.2 m/s | 7.2 |
| 2013 | 37.1°C | 29.5°C | 21.9°C | 40.0°C | 16.1°C | 4 mm | 40% | 3 m/s | 6.6 |
| 2012 | 37.4°C | 28.5°C | 19.6°C | 41.2°C | 15.5°C | 14 mm | 31% | 3.1 m/s | 7.1 |
| 2011 | 35.9°C | 27.7°C | 19.5°C | 39.0°C | 12.9°C | 0 mm | 36% | 3.1 m/s | 6.9 |
| 2010 | 36.8°C | 30.0°C | 23.2°C | 39.3°C | 19.2°C | 29 mm | 47% | 3.7 m/s | 6.1 |
| 2009 | 37.8°C | 30.2°C | 22.5°C | 39.3°C | 17.1°C | 4 mm | 34% | 3 m/s | 6.8 |
| 2008 | 37.7°C | 29.5°C | 21.4°C | 39.6°C | 17.4°C | 6 mm | 34% | 3.2 m/s | 6.9 |
| 2007 | 36.9°C | 28.0°C | 19.2°C | 39.7°C | 13.4°C | 1 mm | 32% | 3.2 m/s | 7.1 |
| 2006 | 35.5°C | 26.7°C | 17.9°C | 38.9°C | 12.8°C | 1 mm | 37% | 3.6 m/s | 7.2 |
| 2005 | 37.4°C | 29.7°C | 22.0°C | 40.0°C | 17.1°C | 8 mm | 37% | 2.9 m/s | 6.5 |
| 2004 | 35.3°C | 26.7°C | 18.1°C | 39.4°C | 11.9°C | 0 mm | 33% | 3.7 m/s | 7.1 |
| 2003 | 37.9°C | 30.5°C | 23.2°C | 40.8°C | 13.1°C | 2 mm | 34% | 2.7 m/s | 6.5 |
| 2002 | 37.2°C | 29.2°C | 21.3°C | 39.7°C | 16.9°C | 2 mm | 34% | 2.8 m/s | 6.5 |
| 2001 | 37.3°C | 29.0°C | 20.6°C | 39.6°C | 15.1°C | 8 mm | 36% | 3.3 m/s | 6.8 |
| 2000 | 37.2°C | 29.4°C | 21.5°C | 40.3°C | 16.0°C | 2 mm | 37% | 3.1 m/s | 6.8 |
| 1999 | 36.8°C | 28.2°C | 19.6°C | 38.5°C | 14.9°C | 0 mm | 35% | 3.4 m/s | 6.8 |
| 1998 🌧️ | 37.4°C | 29.8°C | 22.2°C | 40.0°C | 18.4°C | 38 mm | 40% | 3.2 m/s | 6.3 |
| 1997 | 37.6°C | 29.0°C | 20.4°C | 40.5°C | 17.3°C | 1 mm | 37% | 3.2 m/s | 6.6 |
| 1996 | 36.7°C | 28.2°C | 19.7°C | 40.0°C | 14.4°C | 0 mm | 32% | 3 m/s | 6.7 |
| 1995 | 38.1°C | 30.2°C | 22.3°C | 39.5°C | 18.3°C | 4 mm | 36% | 2.9 m/s | 6.5 |
| 1994 | 36.1°C | 27.3°C | 18.5°C | 39.6°C | 15.2°C | 0 mm | 33% | 3.3 m/s | 6.8 |
| 1993 | 36.5°C | 28.8°C | 21.1°C | 39.0°C | 17.3°C | 13 mm | 40% | 3.3 m/s | 6.7 |
| 1992 🔥 | 38.0°C | 30.9°C | 23.8°C | 40.6°C | 19.6°C | 16 mm | 40% | 2.7 m/s | 6.5 |
| 1991 | 37.6°C | 29.3°C | 21.0°C | 39.4°C | 16.9°C | 2 mm | 32% | 2.8 m/s | 6.9 |
| 1990 ❄️ | 35.3°C | 26.6°C | 18.0°C | 37.3°C | 12.6°C | 0 mm | 34% | 4.1 m/s | 7.2 |
| 1989 | 38.0°C | 29.2°C | 20.4°C | 41.5°C | 15.3°C | 0 mm | 32% | 3.4 m/s | 7.1 |
| 1988 | 38.1°C | 30.2°C | 22.3°C | 41.3°C | 15.2°C | 4 mm | 36% | 3.3 m/s | 6.9 |
| 1987 | 36.3°C | 28.0°C | 19.6°C | 38.5°C | 15.3°C | 4 mm | 36% | 3.5 m/s | 6.7 |
| 1986 | 37.1°C | 29.5°C | 22.0°C | 40.7°C | 13.4°C | 23 mm | 38% | 3.1 m/s | 6.7 |
| 1985 | 36.2°C | 27.7°C | 19.2°C | 38.9°C | 14.4°C | 2 mm | 32% | 3.3 m/s | 7.2 |
| 1984 | 35.1°C | 27.9°C | 20.7°C | 38.0°C | 14.1°C | 35 mm | 40% | 2.8 m/s | 6.7 |
| 1983 | 37.9°C | 30.0°C | 22.0°C | 40.1°C | 17.2°C | 2 mm | 37% | 3.3 m/s | — |
| 1982 | 35.1°C | 27.0°C | 18.9°C | 38.6°C | 14.4°C | 1 mm | 36% | 3.3 m/s | — |
| 1981 | 36.1°C | 28.7°C | 21.2°C | 37.7°C | 18.3°C | 21 mm | 46% | 3.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 36.9°C with lows near 20.9°C (mean 28.9°C), based on 45 years of NASA POWER data.
September averages 7 mm of rainfall in Katherine, one of the drier months. The wettest on record was 38 mm in 1998.
The hottest September reached 41.5°C in 1989. The coldest dipped to 11.9°C in 2004.
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 36.1°C to 37.1°C and overnight lows from 20.4°C to 21.9°C over the same span.
September is one of the warmer months of the year in Katherine and one of the drier months, so plan for around 36.9°C daytime highs and 20.9°C at night.
Not quite — September is the 9th coolest month in Katherine, averaging 28.9°C.
For September in Katherine, pack light, breathable clothing and sun protection, with typical highs of 36.9°C and lows of 20.9°C.
Relative humidity in September averages 36% — relatively dry.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4.1 m/s (1990).
The wettest September on record was 1998 with 38 mm. On average, September sees 7 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 Katherine 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.
