September is one of the warmer months of the year in Mau, with average highs near 33.9°C and lows around 21.9°C (mean 27.9°C). It is a relatively wet time of year, averaging 165 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Mau. Across 45 years of records, the warmest September in Mau was 1983 — when the month averaged 31.3°C — while the coldest was 1984 at 24.2°C. Typical September days reach 33.9°C with nights near 21.9°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.1°C | 27.3°C | 28.0°C | 27.8°C | 28.6°C | +0.5°C |
| Avg High | 34.8°C | 33.2°C | 33.9°C | 33.9°C | 33.8°C | -1°C |
| Avg Low | 21.4°C | 21.5°C | 22.2°C | 21.7°C | 23.5°C | +2.1°C |
| Avg Rain | 162 mm | 162 mm | 150 mm | 188 mm | 166 mm | +3 mm |
September temperatures in Mau have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 16.1°C (1994) to a record high of 38.1°C (1983).
Rainfall in September is a relatively wet time of year, averaging 165 mm, with a wettest year of 347 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Mau
September is a good time to visit Mau, with days averaging 33.9°C and nights around 21.9°C (mean 27.9°C, warmer than Mau's yearly average) and higher rainfall. November and February are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 33.8°C | 24.9°C | 29.3°C | 118 mm | 87% | 1.5 m/s | 4.5 |
| 2024 | 34.1°C | 23.8°C | 28.9°C | 222 mm | 86% | 1.9 m/s | 4.5 |
| 2023 | 35.0°C | 24.3°C | 29.7°C | 94 mm | 83% | 2 m/s | 4.5 |
| 2022 | 33.3°C | 22.7°C | 28.0°C | 180 mm | 84% | 1.8 m/s | 4.1 |
| 2021 | 33.0°C | 24.3°C | 28.6°C | 167 mm | 88% | 2.1 m/s | 4.7 |
| 2020 | 33.4°C | 20.8°C | 27.1°C | 213 mm | 86% | 1.5 m/s | 4.2 |
| 2019 | 35.0°C | 21.1°C | 28.0°C | 342 mm | 85% | 2.1 m/s | 3.8 |
| 2018 | 32.8°C | 21.2°C | 27.0°C | 130 mm | 84% | 2 m/s | 4.9 |
| 2017 | 34.1°C | 23.3°C | 28.7°C | 68 mm | 84% | 1.5 m/s | 4.8 |
| 2016 | 33.7°C | 23.8°C | 28.8°C | 262 mm | 86% | 1.5 m/s | 3.9 |
| 2015 | 35.9°C | 19.9°C | 27.9°C | 36 mm | 74% | 1.8 m/s | 5.3 |
| 2014 | 34.4°C | 20.2°C | 27.3°C | 186 mm | 83% | 1.8 m/s | 4.7 |
| 2013 | 33.5°C | 23.5°C | 28.5°C | 182 mm | 81% | 1.6 m/s | 5 |
| 2012 | 33.3°C | 20.6°C | 26.9°C | 270 mm | 85% | 1.8 m/s | 4.6 |
| 2011 | 33.2°C | 22.5°C | 27.9°C | 222 mm | 86% | 2.2 m/s | 4.5 |
| 2010 | 33.4°C | 20.8°C | 27.1°C | 180 mm | 86% | 2 m/s | 4.8 |
| 2009 | 33.5°C | 22.9°C | 28.2°C | 118 mm | 84% | 1.9 m/s | 5 |
| 2008 | 33.0°C | 21.5°C | 27.2°C | 160 mm | 87% | 1.8 m/s | 5.3 |
| 2007 | 33.2°C | 22.3°C | 27.7°C | 265 mm | 87% | 2.2 m/s | 4.5 |
| 2006 | 34.0°C | 22.4°C | 28.2°C | 141 mm | 84% | 2 m/s | 4.9 |
| 2005 | 33.0°C | 22.0°C | 27.5°C | 83 mm | 86% | 2.2 m/s | 4.8 |
| 2004 | 37.1°C | 22.7°C | 29.9°C | 45 mm | 74% | 1.8 m/s | 5.1 |
| 2003 | 34.2°C | 23.4°C | 28.8°C | 130 mm | 84% | 2.2 m/s | 4.3 |
| 2002 | 35.3°C | 21.9°C | 28.6°C | 126 mm | 77% | 2.4 m/s | 4.8 |
| 2001 | 33.0°C | 21.5°C | 27.2°C | 200 mm | 84% | 1.6 m/s | 4.9 |
| 2000 | 32.6°C | 21.0°C | 26.8°C | 230 mm | 87% | 2.3 m/s | 4.1 |
| 1999 | 32.7°C | 22.7°C | 27.7°C | 77 mm | 86% | 2.3 m/s | 4.9 |
| 1998 | 33.0°C | 23.6°C | 28.3°C | 157 mm | 88% | 2.2 m/s | 4.9 |
| 1997 | 32.8°C | 20.7°C | 26.8°C | 182 mm | 84% | 1.6 m/s | 4.7 |
| 1996 | 32.6°C | 23.3°C | 27.9°C | 143 mm | 85% | 1.4 m/s | 5 |
| 1995 | 33.0°C | 21.5°C | 27.3°C | 194 mm | 85% | 2.2 m/s | 4.7 |
| 1994 | 32.8°C | 16.1°C | 24.4°C | 189 mm | 84% | 2.3 m/s | 5 |
| 1993 | 32.8°C | 22.8°C | 27.8°C | 257 mm | 88% | 2.3 m/s | 4.4 |
| 1992 | 34.9°C | 20.9°C | 27.9°C | 72 mm | 79% | 1.9 m/s | 5.3 |
| 1991 | 33.0°C | 20.7°C | 26.8°C | 223 mm | 84% | 1.4 m/s | 4.6 |
| 1990 | 34.0°C | 23.0°C | 28.5°C | 123 mm | 87% | 2.3 m/s | 4.4 |
| 1989 | 36.8°C | 23.4°C | 30.1°C | 122 mm | 78% | 2 m/s | 4.8 |
| 1988 | 33.8°C | 22.6°C | 28.2°C | 102 mm | 85% | 1.8 m/s | 5.4 |
| 1987 🌧️ | 33.5°C | 20.0°C | 26.8°C | 347 mm | 89% | 2 m/s | 4.1 |
| 1986 | 36.4°C | 20.1°C | 28.3°C | 68 mm | 75% | 2.3 m/s | 5 |
| 1985 | 34.0°C | 22.8°C | 28.4°C | 235 mm | 87% | 2 m/s | 5.1 |
| 1984 ❄️ | 31.2°C | 17.2°C | 24.2°C | 217 mm | 86% | 2.1 m/s | 5.4 |
| 1983 🔥 | 38.1°C | 24.5°C | 31.3°C | 45 mm | 68% | 2.4 m/s | — |
| 1982 | 35.4°C | 18.7°C | 27.0°C | 132 mm | 82% | 2 m/s | — |
| 1981 | 33.6°C | 23.3°C | 28.5°C | 194 mm | 87% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.9°C with lows near 21.9°C (mean 27.9°C), based on 45 years of NASA POWER data.
September averages 165 mm of rainfall in Mau, a relatively wet time of year. The wettest on record was 347 mm in 1987.
The hottest September reached 38.1°C in 1983. The coldest dipped to 16.1°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 34.5°C to 33.8°C and overnight lows from 21.3°C to 24°C over the same span.
September is one of the warmer months of the year in Mau and a relatively wet time of year, so plan for around 33.9°C daytime highs and 21.9°C at night.
Not quite — September is the 7th coolest month in Mau, averaging 27.9°C.
For September in Mau, pack light, breathable clothing and sun protection, with typical highs of 33.9°C and lows of 21.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.4 m/s (1983).
The wettest September on record was 1987 with 347 mm. On average, September sees 165 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 Mau 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.
