September is one of the warmer months of the year in Troy, with average highs near 22.4°C and lows around 10.4°C (mean 16.4°C). It is about average for rainfall, averaging 97 mm of rainfall and 78% relative humidity across the period.
September is one of the warmer months of the year in Troy. Across 45 years of records, the warmest September in Troy was 2015 — when the month averaged 19.4°C — while the coldest was 1984 at 13.8°C. Typical September days reach 22.4°C with nights near 10.4°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Troy, averaging 97 mm of rainfall. The wettest September on record was 2011 with 216 mm, while the driest was 2014 at 34 mm.
Relative humidity in Troy during September averages 78%. The most humid September was 2011 at 87%, and the least humid was 1995 at 68%.
September receives about 4.2 kWh/m²/day of solar energy in Troy. The sunniest Septembers were 2015 and 2016 at 4.7 kWh/m²/day, and the cloudiest was 1993 at 3.2.
Average wind speed in Troy during September is 0.1 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.2 m/s, while the calmest were 2020, 2021 and 2022, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.4°C | 15.6°C | 16.5°C | 17.4°C | 17.3°C | +1.9°C |
| Avg High | 21.5°C | 21.6°C | 22.5°C | 23.3°C | 23.1°C | +1.6°C |
| Avg Low | 9.3°C | 9.7°C | 10.5°C | 11.4°C | 11.4°C | +2.1°C |
| Avg Rain | 92 mm | 98 mm | 95 mm | 102 mm | 100 mm | +7 mm |
September temperatures in Troy have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.6°C (2000) to a record high of 33.9°C (1999).
Rainfall in September is about average for rainfall, averaging 97 mm, with a wettest year of 216 mm.
One of the best times to visit Troy
September is one of the best times to visit Troy. Expect days averaging 22.4°C and nights around 10.4°C (mean 16.4°C) — warmer than Troy's yearly average — with higher rainfall (97 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 | 24.3°C | 17.9°C | 11.4°C | 27.5°C | 5.6°C | 87 mm | 73% | 0.2 m/s | 4.5 |
| 2024 | 23.4°C | 17.4°C | 11.4°C | 27.2°C | 7.1°C | 44 mm | 79% | 0.2 m/s | 4.5 |
| 2023 | 22.4°C | 17.2°C | 12.1°C | 31.3°C | 5.7°C | 96 mm | 85% | 0.2 m/s | 4 |
| 2022 | 22.5°C | 16.8°C | 11.1°C | 33.0°C | 1.9°C | 149 mm | 80% | 0.1 m/s | 3.9 |
| 2021 | 22.6°C | 17.2°C | 11.8°C | 27.5°C | 5.1°C | 142 mm | 83% | 0.1 m/s | 4.1 |
| 2020 | 23.4°C | 17.0°C | 10.6°C | 29.9°C | 1.1°C | 80 mm | 72% | 0.1 m/s | 4.4 |
| 2019 | 22.9°C | 16.6°C | 10.2°C | 29.6°C | 5.8°C | 50 mm | 77% | 0.1 m/s | 4.4 |
| 2018 | 23.4°C | 18.4°C | 13.3°C | 32.0°C | 5.4°C | 132 mm | 81% | 0.1 m/s | 3.6 |
| 2017 | 23.7°C | 17.8°C | 12.0°C | 31.4°C | 4.4°C | 72 mm | 79% | 0.2 m/s | 4.4 |
| 2016 | 25.2°C | 18.5°C | 11.8°C | 32.2°C | 3.6°C | 60 mm | 70% | 0.1 m/s | 4.7 |
| 2015 🔥 | 26.0°C | 19.4°C | 12.9°C | 33.2°C | 5.8°C | 158 mm | 72% | 0.1 m/s | 4.7 |
| 2014 | 22.9°C | 16.6°C | 10.2°C | 30.7°C | 1.8°C | 34 mm | 76% | 0.1 m/s | 4.5 |
| 2013 | 21.2°C | 15.0°C | 8.9°C | 31.4°C | 1.6°C | 86 mm | 79% | 0.2 m/s | 4.5 |
| 2012 | 22.3°C | 16.5°C | 10.6°C | 29.3°C | 4.9°C | 126 mm | 76% | 0.1 m/s | 4.2 |
| 2011 🌧️ | 22.4°C | 17.6°C | 12.7°C | 28.9°C | 3.0°C | 216 mm | 87% | 0.1 m/s | 3.6 |
| 2010 | 23.1°C | 17.4°C | 11.7°C | 32.5°C | 5.7°C | 91 mm | 75% | 0.1 m/s | 4 |
| 2009 | 20.6°C | 15.0°C | 9.4°C | 25.7°C | 2.9°C | 58 mm | 82% | 0.1 m/s | 4.3 |
| 2008 | 22.0°C | 16.4°C | 10.8°C | 29.3°C | 2.4°C | 104 mm | 83% | 0.1 m/s | 4.3 |
| 2007 | 23.5°C | 17.1°C | 10.7°C | 32.1°C | 4.4°C | 83 mm | 78% | 0.1 m/s | 4.6 |
| 2006 | 20.3°C | 15.0°C | 9.7°C | 26.0°C | 2.6°C | 79 mm | 84% | 0.1 m/s | 3.6 |
| 2005 | 24.6°C | 18.2°C | 11.9°C | 31.3°C | 4.4°C | 67 mm | 74% | 0.1 m/s | 4.6 |
| 2004 | 22.5°C | 16.8°C | 11.1°C | 27.8°C | 4.7°C | 132 mm | 84% | 0.1 m/s | 4.3 |
| 2003 | 22.3°C | 16.5°C | 10.8°C | 27.1°C | 5.6°C | 155 mm | 83% | 0.1 m/s | 3.9 |
| 2002 | 25.2°C | 18.5°C | 11.7°C | 33.8°C | 4.9°C | 115 mm | 71% | 0.1 m/s | 4.5 |
| 2001 | 23.3°C | 16.5°C | 9.7°C | 32.5°C | 3.4°C | 80 mm | 72% | 0.1 m/s | 4.5 |
| 2000 | 20.7°C | 14.7°C | 8.7°C | 32.7°C | -2.6°C | 80 mm | 80% | 0.1 m/s | 4 |
| 1999 | 24.0°C | 18.0°C | 12.0°C | 33.9°C | 3.5°C | 213 mm | 76% | 0.1 m/s | 4 |
| 1998 | 22.7°C | 16.5°C | 10.3°C | 28.3°C | 1.8°C | 63 mm | 80% | 0.1 m/s | 4.3 |
| 1997 | 20.9°C | 14.9°C | 8.9°C | 27.2°C | 1.2°C | 79 mm | 78% | 0.1 m/s | 4.3 |
| 1996 | 21.0°C | 16.1°C | 11.2°C | 27.0°C | 4.7°C | 119 mm | 84% | 0.1 m/s | 3.5 |
| 1995 | 22.0°C | 15.2°C | 8.3°C | 28.5°C | 1.4°C | 74 mm | 68% | 0.1 m/s | 4.1 |
| 1994 | 20.5°C | 14.9°C | 9.3°C | 27.2°C | 4.8°C | 77 mm | 82% | 0.1 m/s | 4.1 |
| 1993 | 21.2°C | 15.4°C | 9.7°C | 31.1°C | 0.2°C | 95 mm | 78% | 0.1 m/s | 3.2 |
| 1992 | 21.8°C | 15.5°C | 9.2°C | 28.9°C | -0.8°C | 92 mm | 76% | 0.1 m/s | 4.1 |
| 1991 | 21.1°C | 15.0°C | 8.8°C | 30.3°C | -2.3°C | 105 mm | 73% | 0.1 m/s | 4.4 |
| 1990 | 20.7°C | 14.9°C | 9.1°C | 27.0°C | 0.4°C | 63 mm | 81% | 0.1 m/s | 4 |
| 1989 | 21.7°C | 15.9°C | 10.1°C | 29.9°C | -0.4°C | 116 mm | 80% | 0.1 m/s | 3.9 |
| 1988 | 21.2°C | 14.6°C | 8.0°C | 25.6°C | 1.3°C | 49 mm | 75% | 0.1 m/s | 4.5 |
| 1987 | 20.2°C | 14.9°C | 9.7°C | 26.0°C | 1.8°C | 183 mm | 83% | 0.1 m/s | 3.6 |
| 1986 | 20.4°C | 14.8°C | 9.1°C | 26.4°C | 2.4°C | 81 mm | 79% | 0.2 m/s | 3.7 |
| 1985 | 23.5°C | 16.9°C | 10.3°C | 29.3°C | 2.8°C | 105 mm | 74% | 0.1 m/s | 4.1 |
| 1984 ❄️ | 20.0°C | 13.8°C | 7.7°C | 26.9°C | 1.9°C | 46 mm | 78% | 0.1 m/s | 4.5 |
| 1983 | 23.1°C | 16.3°C | 9.5°C | 30.8°C | 3.5°C | 62 mm | 74% | 0.2 m/s | — |
| 1982 | 22.8°C | 16.3°C | 9.8°C | 29.5°C | 5.3°C | 51 mm | 74% | 0.2 m/s | — |
| 1981 | 21.0°C | 15.3°C | 9.5°C | 28.2°C | -1.7°C | 137 mm | 76% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.4°C with lows near 10.4°C (mean 16.4°C), based on 45 years of NASA POWER data.
September averages 97 mm of rainfall in Troy, about average for rainfall. The wettest on record was 216 mm in 2011.
The hottest September reached 33.9°C in 1999. The coldest dipped to -2.6°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 22.1°C to 23°C and overnight lows from 9.4°C to 11.6°C over the same span.
September is one of the warmer months of the year in Troy and about average for rainfall, so plan for around 22.4°C daytime highs and 10.4°C at night.
Not quite — September is the 9th coolest month in Troy, averaging 16.4°C.
For September in Troy, pack light layers you can adjust through the day, with typical highs of 22.4°C and lows of 10.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 78% — quite humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.2 m/s (1982).
The wettest September on record was 2011 with 216 mm. On average, September sees 97 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 Troy 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.
