September is one of the warmer months of the year in Milton, with average highs near 17.2°C and lows around 8.9°C (mean 13.1°C). It is about average for rainfall, averaging 69 mm of rainfall and 86% 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 2023 — when the month averaged 15.7°C — while the coldest was 1986 at 10.5°C. Typical September days reach 17.2°C with nights near 8.9°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Milton, averaging 69 mm of rainfall. The wettest September on record was 2000 with 142 mm, while the driest was 1986 at 15 mm.
Relative humidity in Milton during September averages 86%. The most humid September was 2000 at 89%, and the least humid was 1991 at 81%.
September receives about 2.9 kWh/m²/day of solar energy in Milton. The sunniest Septembers were 1986 and 1991 at 3.4 kWh/m²/day, and the cloudiest were 1993 and 2000 at 2.5.
Average wind speed in Milton during September is 3 m/s. The windiest Septembers were 1983 and 2004 at 3.8 m/s, while the calmest was 2014 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.6°C | 12.7°C | 13.4°C | 13.0°C | 13.9°C | +1.3°C |
| Avg High | 16.7°C | 16.8°C | 17.5°C | 17.3°C | 18.3°C | +1.6°C |
| Avg Low | 8.5°C | 8.6°C | 9.2°C | 8.7°C | 9.6°C | +1.1°C |
| Avg Rain | 65 mm | 71 mm | 68 mm | 66 mm | 76 mm | +10 mm |
September temperatures in Milton have risen by about 1.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.1°C (1986) to a record high of 26.7°C (2023).
Rainfall in September is about average for rainfall, averaging 69 mm, with a wettest year of 142 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
One of the best times to visit Milton
September is one of the best times to visit Milton. Expect days averaging 17.2°C and nights around 8.9°C (mean 13.1°C) — warmer than Milton's yearly average — with moderate rainfall (69 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 | 17.5°C | 13.1°C | 8.7°C | 22.1°C | 2.7°C | 93 mm | 85% | 3.3 m/s | 2.8 |
| 2024 | 17.1°C | 13.2°C | 9.2°C | 23.6°C | 3.0°C | 118 mm | 88% | 3.1 m/s | 2.7 |
| 2023 🔥 | 20.2°C | 15.7°C | 11.3°C | 26.7°C | 6.1°C | 78 mm | 86% | 2.8 m/s | 2.8 |
| 2022 | 17.8°C | 13.5°C | 9.3°C | 21.6°C | 3.8°C | 68 mm | 85% | 2.7 m/s | 3 |
| 2021 | 19.5°C | 15.0°C | 10.5°C | 25.8°C | 6.3°C | 60 mm | 87% | 2.5 m/s | 2.8 |
| 2020 | 17.7°C | 13.0°C | 8.3°C | 25.2°C | 2.8°C | 37 mm | 85% | 3 m/s | 3.1 |
| 2019 | 17.5°C | 13.1°C | 8.8°C | 21.4°C | 4.9°C | 122 mm | 86% | 3 m/s | 2.9 |
| 2018 | 17.2°C | 12.8°C | 8.5°C | 22.3°C | 2.9°C | 58 mm | 85% | 3.2 m/s | 2.8 |
| 2017 | 16.4°C | 12.4°C | 8.5°C | 21.1°C | 4.9°C | 90 mm | 88% | 3.2 m/s | 2.7 |
| 2016 | 19.0°C | 14.8°C | 10.5°C | 25.9°C | 6.5°C | 57 mm | 87% | 3.1 m/s | 2.9 |
| 2015 | 16.2°C | 11.8°C | 7.3°C | 19.5°C | 5.4°C | 43 mm | 86% | 2.5 m/s | 3.3 |
| 2014 | 18.7°C | 13.7°C | 8.8°C | 21.1°C | 5.4°C | 17 mm | 86% | 2 m/s | 3.1 |
| 2013 | 17.0°C | 12.6°C | 8.3°C | 21.9°C | 4.9°C | 41 mm | 87% | 2.7 m/s | 2.6 |
| 2012 | 16.0°C | 11.8°C | 7.6°C | 21.8°C | 2.8°C | 106 mm | 87% | 3.4 m/s | 2.8 |
| 2011 | 18.0°C | 14.0°C | 10.0°C | 24.5°C | 7.0°C | 49 mm | 85% | 3.7 m/s | 2.8 |
| 2010 | 16.7°C | 12.7°C | 8.8°C | 21.5°C | 2.9°C | 79 mm | 86% | 3.2 m/s | 2.8 |
| 2009 | 17.2°C | 13.1°C | 8.9°C | 22.5°C | 6.0°C | 31 mm | 87% | 3 m/s | 2.8 |
| 2008 | 16.5°C | 12.7°C | 8.8°C | 19.4°C | 5.3°C | 95 mm | 87% | 2.7 m/s | 2.6 |
| 2007 | 16.9°C | 12.9°C | 8.9°C | 22.0°C | 3.3°C | 42 mm | 87% | 3.2 m/s | 2.9 |
| 2006 | 19.8°C | 15.5°C | 11.1°C | 24.9°C | 6.6°C | 71 mm | 86% | 3 m/s | 3.1 |
| 2005 | 18.5°C | 14.1°C | 9.6°C | 24.6°C | 4.3°C | 65 mm | 86% | 2.9 m/s | 2.9 |
| 2004 | 17.6°C | 13.6°C | 9.6°C | 24.1°C | 5.2°C | 59 mm | 86% | 3.8 m/s | 3.1 |
| 2003 | 17.8°C | 13.0°C | 8.2°C | 22.1°C | 4.1°C | 43 mm | 85% | 2.2 m/s | 3 |
| 2002 | 17.3°C | 13.2°C | 9.0°C | 20.9°C | 5.5°C | 41 mm | 86% | 2.2 m/s | 3.1 |
| 2001 | 15.9°C | 12.1°C | 8.4°C | 20.1°C | 6.0°C | 92 mm | 88% | 3.5 m/s | 2.6 |
| 2000 🌧️ | 17.3°C | 13.5°C | 9.6°C | 24.3°C | 5.0°C | 142 mm | 89% | 2.9 m/s | 2.5 |
| 1999 | 18.7°C | 14.5°C | 10.2°C | 24.3°C | 6.7°C | 95 mm | 86% | 2.8 m/s | 3 |
| 1998 | 17.6°C | 13.7°C | 9.8°C | 22.2°C | 5.5°C | 70 mm | 88% | 3.2 m/s | 3 |
| 1997 | 17.0°C | 12.9°C | 8.8°C | 19.6°C | 5.8°C | 30 mm | 86% | 3.1 m/s | 2.9 |
| 1996 | 16.7°C | 12.5°C | 8.2°C | 21.3°C | 4.3°C | 25 mm | 84% | 3.1 m/s | 3 |
| 1995 | 16.3°C | 12.4°C | 8.5°C | 19.4°C | 4.1°C | 99 mm | 86% | 3 m/s | 3 |
| 1994 | 15.1°C | 11.4°C | 7.7°C | 18.5°C | 4.4°C | 107 mm | 87% | 3.4 m/s | 2.8 |
| 1993 | 15.5°C | 11.4°C | 7.3°C | 21.8°C | 3.3°C | 85 mm | 86% | 3.1 m/s | 2.5 |
| 1992 | 16.4°C | 12.4°C | 8.4°C | 21.7°C | 4.7°C | 90 mm | 85% | 3.4 m/s | 3 |
| 1991 | 18.5°C | 13.6°C | 8.6°C | 24.8°C | 4.2°C | 48 mm | 81% | 2.9 m/s | 3.4 |
| 1990 | 15.9°C | 12.0°C | 8.2°C | 22.3°C | 3.8°C | 57 mm | 82% | 3.1 m/s | 2.8 |
| 1989 | 17.7°C | 13.6°C | 9.5°C | 22.9°C | 6.4°C | 38 mm | 85% | 2.8 m/s | 2.8 |
| 1988 | 15.9°C | 12.1°C | 8.3°C | 23.8°C | 2.7°C | 52 mm | 86% | 3.6 m/s | 2.6 |
| 1987 | 16.4°C | 12.3°C | 8.2°C | 20.9°C | 3.3°C | 67 mm | 87% | 3.1 m/s | 3.1 |
| 1986 ❄️ | 15.3°C | 10.5°C | 5.8°C | 19.9°C | 1.1°C | 15 mm | 84% | 2.4 m/s | 3.4 |
| 1985 | 17.5°C | 13.4°C | 9.2°C | 22.2°C | 6.0°C | 41 mm | 88% | 3.1 m/s | 2.7 |
| 1984 | 16.2°C | 12.5°C | 8.8°C | 23.3°C | 3.8°C | 102 mm | 84% | 3.4 m/s | 2.7 |
| 1983 | 16.3°C | 12.4°C | 8.6°C | 21.3°C | 4.8°C | 80 mm | 86% | 3.8 m/s | — |
| 1982 | 17.6°C | 13.2°C | 8.7°C | 23.6°C | 4.6°C | 80 mm | 87% | 2.9 m/s | — |
| 1981 | 17.2°C | 13.3°C | 9.3°C | 21.7°C | 5.8°C | 115 mm | 86% | 3.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.2°C with lows near 8.9°C (mean 13.1°C), based on 45 years of NASA POWER data.
September averages 69 mm of rainfall in Milton, about average for rainfall. The wettest on record was 142 mm in 2000.
The hottest September reached 26.7°C in 2023. The coldest dipped to 1.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.1°C. Daytime highs moved from 17°C to 18.4°C and overnight lows from 8.9°C to 9.8°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 17.2°C daytime highs and 8.9°C at night.
Not quite — September is the 9th coolest month in Milton, averaging 13.1°C.
For September in Milton, pack light layers you can adjust through the day, with typical highs of 17.2°C and lows of 8.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 86% — quite humid.
Average wind speed in September is 3 m/s. The windiest September on record averaged 3.8 m/s (1983).
The wettest September on record was 2000 with 142 mm. On average, September sees 69 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.
