September is one of the warmer months of the year in Manhattan, with average highs near 27.9°C and lows around 15.1°C (mean 21.5°C). It is about average for rainfall, averaging 77 mm of rainfall and 62% relative humidity across the period.
September is one of the warmer months of the year in Manhattan. Across 45 years of records, the warmest September in Manhattan was 2023 — when the month averaged 24.4°C — while the coldest was 1993 at 16.8°C. Typical September days reach 27.9°C with nights near 15.1°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Manhattan, averaging 77 mm of rainfall. The wettest September on record was 1986 with 167 mm, while the driest was 1990 at 27 mm.
Relative humidity in Manhattan during September averages 62%. The most humid September was 2019 at 81%, and the least humid was 2000 at 39%.
September receives about 4.7 kWh/m²/day of solar energy in Manhattan. The sunniest September was 2004 at 5.4 kWh/m²/day, and the cloudiest was 1985 at 3.9.
Average wind speed in Manhattan during September is 3.3 m/s. The windiest September was 1985 at 4.2 m/s, while the calmest was 2025 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 20.8°C | 21.0°C | 22.1°C | 23.0°C | +1.9°C |
| Avg High | 27.5°C | 27.3°C | 27.5°C | 28.2°C | 29.9°C | +2.4°C |
| Avg Low | 14.7°C | 14.4°C | 14.5°C | 16.0°C | 16.2°C | +1.5°C |
| Avg Rain | 85 mm | 82 mm | 74 mm | 77 mm | 60 mm | -25 mm |
September temperatures in Manhattan have risen by about 2.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -1.2°C (1995) to a record high of 42.9°C (2000).
Rainfall in September is about average for rainfall, averaging 77 mm, with a wettest year of 167 mm.
One of the best times to visit Manhattan
September is one of the best times to visit Manhattan. Expect days averaging 27.9°C and nights around 15.1°C (mean 21.5°C) — warmer than Manhattan's yearly average — with moderate rainfall (77 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 | 28.1°C | 22.2°C | 16.3°C | 34.4°C | 8.9°C | 94 mm | 70% | 2.3 m/s | 4.4 |
| 2024 | 31.0°C | 23.7°C | 16.3°C | 37.0°C | 12.3°C | 31 mm | 51% | 2.7 m/s | 5.2 |
| 2023 🔥 | 31.7°C | 24.4°C | 17.1°C | 38.2°C | 12.6°C | 50 mm | 52% | 3 m/s | 5.1 |
| 2022 | 30.9°C | 23.6°C | 16.3°C | 38.8°C | 9.8°C | 52 mm | 51% | 3.1 m/s | 5.1 |
| 2021 | 30.6°C | 24.0°C | 17.4°C | 35.5°C | 9.3°C | 81 mm | 59% | 3.3 m/s | 4.8 |
| 2020 | 26.8°C | 20.1°C | 13.5°C | 37.3°C | 6.8°C | 50 mm | 64% | 3 m/s | 4.5 |
| 2019 | 28.4°C | 23.5°C | 18.6°C | 32.6°C | 11.9°C | 65 mm | 81% | 3.6 m/s | 4.8 |
| 2018 | 26.3°C | 21.2°C | 16.0°C | 33.6°C | 8.1°C | 131 mm | 78% | 3.1 m/s | 4.2 |
| 2017 | 30.0°C | 23.5°C | 17.0°C | 35.2°C | 10.3°C | 52 mm | 56% | 3.3 m/s | 4.7 |
| 2016 | 27.7°C | 21.8°C | 16.0°C | 33.2°C | 7.4°C | 114 mm | 73% | 3.3 m/s | 4.8 |
| 2015 | 30.4°C | 24.2°C | 18.1°C | 38.1°C | 10.9°C | 56 mm | 62% | 3.5 m/s | 4.8 |
| 2014 | 27.4°C | 21.2°C | 15.0°C | 35.3°C | 6.3°C | 83 mm | 66% | 3.3 m/s | 4.6 |
| 2013 | 28.9°C | 22.7°C | 16.5°C | 37.3°C | 9.8°C | 56 mm | 62% | 3.4 m/s | 5.2 |
| 2012 | 28.2°C | 21.1°C | 14.0°C | 41.1°C | 6.7°C | 50 mm | 54% | 2.7 m/s | 4.9 |
| 2011 | 26.5°C | 19.9°C | 13.3°C | 42.1°C | 8.7°C | 50 mm | 51% | 2.9 m/s | 5.1 |
| 2010 | 28.4°C | 22.0°C | 15.6°C | 35.8°C | 7.4°C | 116 mm | 67% | 3.5 m/s | 4.5 |
| 2009 | 24.3°C | 18.9°C | 13.6°C | 28.3°C | 5.7°C | 110 mm | 74% | 2.7 m/s | 4.4 |
| 2008 | 25.1°C | 19.4°C | 13.6°C | 32.2°C | 6.1°C | 131 mm | 75% | 3 m/s | 4.4 |
| 2007 | 28.3°C | 21.9°C | 15.5°C | 33.4°C | 8.8°C | 75 mm | 65% | 3.7 m/s | 4.9 |
| 2006 | 24.9°C | 18.7°C | 12.6°C | 32.2°C | 6.2°C | 72 mm | 62% | 3.2 m/s | 4.7 |
| 2005 | 28.0°C | 22.2°C | 16.3°C | 34.7°C | 4.8°C | 65 mm | 69% | 3.4 m/s | 4.8 |
| 2004 | 30.0°C | 23.0°C | 16.0°C | 34.6°C | 9.1°C | 52 mm | 54% | 3.7 m/s | 5.4 |
| 2003 | 24.7°C | 18.3°C | 12.0°C | 30.7°C | 4.7°C | 79 mm | 65% | 3.3 m/s | 5 |
| 2002 | 30.3°C | 23.1°C | 15.9°C | 39.2°C | 8.4°C | 41 mm | 51% | 3.1 m/s | 5 |
| 2001 | 27.3°C | 20.5°C | 13.7°C | 34.6°C | 4.6°C | 91 mm | 64% | 2.8 m/s | 4.9 |
| 2000 | 31.8°C | 23.8°C | 15.8°C | 42.9°C | 2.3°C | 29 mm | 39% | 3.9 m/s | 5 |
| 1999 | 26.1°C | 19.7°C | 13.2°C | 35.3°C | 4.5°C | 98 mm | 60% | 3.1 m/s | 4.7 |
| 1998 | 30.8°C | 24.3°C | 17.8°C | 39.2°C | 10.1°C | 138 mm | 62% | 2.8 m/s | 4.7 |
| 1997 | 28.3°C | 21.8°C | 15.4°C | 34.8°C | 9.8°C | 103 mm | 64% | 3 m/s | 4.7 |
| 1996 | 25.0°C | 18.8°C | 12.7°C | 32.2°C | 3.2°C | 114 mm | 68% | 2.9 m/s | 4.6 |
| 1995 | 25.4°C | 19.3°C | 13.2°C | 32.7°C | -1.2°C | 86 mm | 67% | 3.1 m/s | 4.5 |
| 1994 | 28.5°C | 21.5°C | 14.5°C | 34.5°C | 5.5°C | 29 mm | 56% | 3.6 m/s | 4.8 |
| 1993 ❄️ | 22.8°C | 16.8°C | 10.8°C | 30.1°C | 2.9°C | 115 mm | 79% | 3.2 m/s | 4.2 |
| 1992 | 26.6°C | 20.3°C | 13.9°C | 32.1°C | 4.4°C | 73 mm | 65% | 3.6 m/s | 4.9 |
| 1991 | 28.2°C | 21.8°C | 15.3°C | 35.6°C | 3.1°C | 41 mm | 53% | 3.6 m/s | 4.8 |
| 1990 | 30.8°C | 23.8°C | 16.7°C | 39.9°C | 5.6°C | 27 mm | 51% | 2.9 m/s | 5 |
| 1989 | 23.6°C | 17.6°C | 11.6°C | 31.6°C | 1.3°C | 126 mm | 74% | 3.1 m/s | 4.6 |
| 1988 | 29.8°C | 22.5°C | 15.3°C | 36.1°C | 7.8°C | 39 mm | 52% | 3.7 m/s | 4.6 |
| 1987 | 27.6°C | 21.0°C | 14.3°C | 32.9°C | 8.3°C | 53 mm | 63% | 2.8 m/s | 4.9 |
| 1986 🌧️ | 27.4°C | 22.2°C | 16.9°C | 31.3°C | 8.9°C | 167 mm | 72% | 3.7 m/s | 4 |
| 1985 | 25.9°C | 20.1°C | 14.3°C | 37.7°C | -0.3°C | 139 mm | 68% | 4.2 m/s | 3.9 |
| 1984 | 27.4°C | 20.5°C | 13.5°C | 38.1°C | 0.6°C | 70 mm | 51% | 3.8 m/s | 4.7 |
| 1983 | 30.1°C | 23.4°C | 16.6°C | 37.3°C | 2.8°C | 61 mm | 49% | 3.9 m/s | — |
| 1982 | 28.0°C | 21.6°C | 15.2°C | 36.5°C | 5.2°C | 59 mm | 60% | 3.6 m/s | — |
| 1981 | 28.1°C | 21.2°C | 14.3°C | 33.5°C | 5.8°C | 51 mm | 59% | 3.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 27.9°C with lows near 15.1°C (mean 21.5°C), based on 45 years of NASA POWER data.
September averages 77 mm of rainfall in Manhattan, about average for rainfall. The wettest on record was 167 mm in 1986.
The hottest September reached 42.9°C in 2000. The coldest dipped to -1.2°C in 1995.
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 27.9°C to 30.5°C and overnight lows from 14.8°C to 16.7°C over the same span.
September is one of the warmer months of the year in Manhattan and about average for rainfall, so plan for around 27.9°C daytime highs and 15.1°C at night.
Not quite — September is the 9th coolest month in Manhattan, averaging 21.5°C.
For September in Manhattan, pack light layers you can adjust through the day, with typical highs of 27.9°C and lows of 15.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 62% — moderately humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4.2 m/s (1985).
The wettest September on record was 1986 with 167 mm. On average, September sees 77 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 Manhattan 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.
