September is one of the warmer months of the year in Milton, with average highs near 29.3°C and lows around 22.5°C (mean 25.9°C). It is about average for rainfall, averaging 136 mm of rainfall and 77% relative humidity across the period.
September is one of the warmer months of the year in Milton. Across 45 years of records, the warmest September in Milton was 2019 — when the month averaged 28.9°C — while the coldest was 1983 at 24°C. Typical September days reach 29.3°C with nights near 22.5°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Milton, averaging 136 mm of rainfall. The wettest September on record was 1998 with 552 mm, while the driest was 2019 at 9 mm.
Relative humidity in Milton during September averages 77%. The most humid September was 1988 at 86%, and the least humid was 2025 at 64%.
September receives about 5.2 kWh/m²/day of solar energy in Milton. The sunniest Septembers were 2010, 2019 and 2025 at 6 kWh/m²/day, and the cloudiest were 1988 and 1998 at 4.
Average wind speed in Milton during September is 2.6 m/s. The windiest September was 1998 at 4 m/s, while the calmest was 1981 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.1°C | 25.9°C | 25.8°C | 26.4°C | 26.6°C | +1.5°C |
| Avg High | 28.4°C | 29.4°C | 29.2°C | 29.9°C | 30.1°C | +1.7°C |
| Avg Low | 21.8°C | 22.4°C | 22.5°C | 23.0°C | 23.1°C | +1.3°C |
| Avg Rain | 140 mm | 133 mm | 140 mm | 121 mm | 151 mm | +10 mm |
September temperatures in Milton have risen by about 2.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 11.9°C (1983) to a record high of 36.1°C (2019).
Rainfall in September is about average for rainfall, averaging 136 mm, with a wettest year of 552 mm.
One of the best times to visit Milton
September is one of the best times to visit Milton. Expect days averaging 29.3°C and nights around 22.5°C (mean 25.9°C) — warmer than Milton's yearly average — with higher rainfall (136 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 | 32.2°C | 27.6°C | 23.0°C | 34.5°C | 20.8°C | 37 mm | 64% | 2.2 m/s | 6 |
| 2024 | 30.1°C | 27.0°C | 23.9°C | 36.0°C | 20.7°C | 198 mm | 78% | 2.6 m/s | 4.7 |
| 2023 | 32.0°C | 28.0°C | 24.1°C | 35.2°C | 20.7°C | 71 mm | 68% | 2.4 m/s | 5.5 |
| 2022 | 29.6°C | 26.0°C | 22.4°C | 32.9°C | 14.3°C | 61 mm | 74% | 2.4 m/s | 5.7 |
| 2021 | 28.3°C | 25.4°C | 22.6°C | 30.8°C | 15.2°C | 164 mm | 81% | 2.1 m/s | 4.9 |
| 2020 | 28.3°C | 25.3°C | 22.4°C | 33.1°C | 14.6°C | 371 mm | 82% | 3.8 m/s | 4.6 |
| 2019 🔥 | 33.3°C | 28.9°C | 24.5°C | 36.1°C | 22.5°C | 9 mm | 66% | 2.6 m/s | 6 |
| 2018 | 29.9°C | 27.3°C | 24.8°C | 32.4°C | 23.3°C | 247 mm | 83% | 2.2 m/s | 5 |
| 2017 | 28.3°C | 25.0°C | 21.7°C | 30.7°C | 16.5°C | 71 mm | 81% | 2.5 m/s | 5.7 |
| 2016 | 30.1°C | 27.0°C | 23.8°C | 33.3°C | 16.7°C | 99 mm | 77% | 2.1 m/s | 5.3 |
| 2015 | 30.3°C | 26.4°C | 22.5°C | 33.5°C | 17.1°C | 179 mm | 73% | 2.7 m/s | 5.2 |
| 2014 | 29.7°C | 26.5°C | 23.4°C | 31.5°C | 17.8°C | 85 mm | 78% | 2.2 m/s | 5.1 |
| 2013 | 29.4°C | 26.3°C | 23.2°C | 31.1°C | 18.7°C | 125 mm | 80% | 2.3 m/s | 5.4 |
| 2012 | 28.3°C | 25.2°C | 22.0°C | 30.8°C | 16.5°C | 146 mm | 79% | 2.5 m/s | 5.3 |
| 2011 | 28.3°C | 24.7°C | 21.1°C | 31.1°C | 15.7°C | 199 mm | 77% | 2.7 m/s | 5 |
| 2010 | 31.1°C | 27.1°C | 23.2°C | 34.5°C | 16.7°C | 55 mm | 70% | 2.3 m/s | 6 |
| 2009 | 28.7°C | 26.1°C | 23.5°C | 30.5°C | 15.9°C | 159 mm | 82% | 2.5 m/s | 4.8 |
| 2008 | 29.6°C | 25.9°C | 22.3°C | 31.4°C | 15.7°C | 54 mm | 75% | 3.4 m/s | 5.2 |
| 2007 | 30.6°C | 26.9°C | 23.2°C | 33.3°C | 18.1°C | 123 mm | 72% | 3 m/s | 5.3 |
| 2006 | 29.6°C | 25.9°C | 22.2°C | 33.0°C | 15.8°C | 113 mm | 70% | 2.4 m/s | 5.4 |
| 2005 | 30.2°C | 26.6°C | 23.0°C | 33.3°C | 19.6°C | 107 mm | 77% | 2.9 m/s | 5.6 |
| 2004 | 29.0°C | 25.5°C | 22.1°C | 32.2°C | 18.4°C | 153 mm | 79% | 3.9 m/s | 5.3 |
| 2003 | 27.7°C | 24.6°C | 21.6°C | 30.4°C | 13.4°C | 123 mm | 81% | 2.7 m/s | 5.4 |
| 2002 | 29.8°C | 27.0°C | 24.2°C | 33.7°C | 20.7°C | 286 mm | 81% | 3.2 m/s | 4.6 |
| 2001 | 27.9°C | 24.4°C | 21.0°C | 31.1°C | 12.4°C | 108 mm | 76% | 2.5 m/s | 5.3 |
| 2000 | 28.9°C | 25.5°C | 22.1°C | 33.2°C | 14.5°C | 175 mm | 78% | 3.1 m/s | 5 |
| 1999 | 30.6°C | 25.9°C | 21.2°C | 33.2°C | 14.3°C | 42 mm | 66% | 3 m/s | 5.4 |
| 1998 🌧️ | 28.3°C | 25.8°C | 23.3°C | 31.4°C | 20.3°C | 552 mm | 85% | 4 m/s | 4 |
| 1997 | 29.6°C | 26.0°C | 22.4°C | 32.6°C | 19.1°C | 75 mm | 76% | 2.1 m/s | 5.8 |
| 1996 | 28.6°C | 25.3°C | 22.1°C | 30.9°C | 16.7°C | 161 mm | 78% | 2.5 m/s | 5.3 |
| 1995 | 31.0°C | 26.7°C | 22.5°C | 33.1°C | 18.0°C | 59 mm | 72% | 2.6 m/s | 5.5 |
| 1994 | 27.9°C | 24.8°C | 21.7°C | 30.1°C | 15.1°C | 108 mm | 81% | 2.5 m/s | 5.3 |
| 1993 | 29.9°C | 26.5°C | 23.1°C | 33.8°C | 13.7°C | 114 mm | 74% | 2.3 m/s | 4.8 |
| 1992 | 27.9°C | 25.3°C | 22.7°C | 31.3°C | 17.6°C | 120 mm | 83% | 2.5 m/s | 4.3 |
| 1991 | 28.4°C | 25.1°C | 21.7°C | 32.3°C | 14.5°C | 54 mm | 81% | 2.6 m/s | 5.3 |
| 1990 | 31.7°C | 27.4°C | 23.2°C | 34.9°C | 14.7°C | 41 mm | 65% | 2.4 m/s | 5.4 |
| 1989 | 28.2°C | 24.9°C | 21.7°C | 32.4°C | 16.0°C | 181 mm | 80% | 2.8 m/s | 5.1 |
| 1988 | 28.2°C | 25.6°C | 23.0°C | 31.5°C | 16.9°C | 365 mm | 86% | 2.8 m/s | 4 |
| 1987 | 28.2°C | 25.1°C | 22.1°C | 30.8°C | 16.3°C | 122 mm | 79% | 2.3 m/s | 5.1 |
| 1986 | 29.8°C | 26.7°C | 23.6°C | 32.7°C | 19.6°C | 140 mm | 78% | 2.1 m/s | 5 |
| 1985 | 27.9°C | 24.6°C | 21.4°C | 31.4°C | 14.0°C | 131 mm | 79% | 3 m/s | 5.4 |
| 1984 | 28.6°C | 24.8°C | 21.1°C | 31.7°C | 15.4°C | 15 mm | 75% | 2.8 m/s | 5.4 |
| 1983 ❄️ | 27.3°C | 24.0°C | 20.8°C | 31.5°C | 11.9°C | 184 mm | 78% | 2.7 m/s | — |
| 1982 | 27.9°C | 24.6°C | 21.4°C | 32.1°C | 13.7°C | 70 mm | 77% | 2.3 m/s | — |
| 1981 | 29.3°C | 25.2°C | 21.0°C | 32.3°C | 12.4°C | 55 mm | 67% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.3°C with lows near 22.5°C (mean 25.9°C), based on 45 years of NASA POWER data.
September averages 136 mm of rainfall in Milton, about average for rainfall. The wettest on record was 552 mm in 1998.
The hottest September reached 36.1°C in 2019. The coldest dipped to 11.9°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.2°C. Daytime highs moved from 28.2°C to 30.4°C and overnight lows from 21.1°C to 23.2°C over the same span.
September is one of the warmer months of the year in Milton and about average for rainfall, so plan for around 29.3°C daytime highs and 22.5°C at night.
Not quite — September is the 9th coolest month in Milton, averaging 25.9°C.
For September in Milton, pack light layers you can adjust through the day, with typical highs of 29.3°C and lows of 22.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 77% — quite humid.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 4 m/s (1998).
The wettest September on record was 1998 with 552 mm. On average, September sees 136 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 Milton 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.
