September is one of the warmer months of the year in Staten Island, with average highs near 25°C and lows around 14.5°C (mean 19.8°C). It is about average for rainfall, averaging 102 mm of rainfall and 73% relative humidity across the period.
September is one of the warmer months of the year in Staten Island. Across 45 years of records, the warmest September in Staten Island was 2005 — when the month averaged 22.6°C — while the coldest was 1984 at 17°C. Typical September days reach 25°C with nights near 14.5°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Staten Island, averaging 102 mm of rainfall. The wettest September on record was 1999 with 236 mm, while the driest was 2019 at 23 mm.
Relative humidity in Staten Island during September averages 73%. The most humid September was 2011 at 87%, and the least humid was 2005 at 61%.
September receives about 4.3 kWh/m²/day of solar energy in Staten Island. The sunniest September was 2007 at 5 kWh/m²/day, and the cloudiest was 2018 at 3.3.
Average wind speed in Staten Island during September is 1.2 m/s. The windiest Septembers were 1992 and 2010 at 1.4 m/s, while the calmest were 2014, 2019 and 2025, among others at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.9°C | 19.1°C | 19.9°C | 20.7°C | 20.5°C | +1.6°C |
| Avg High | 24.5°C | 24.3°C | 25.1°C | 25.9°C | 25.5°C | +1°C |
| Avg Low | 13.4°C | 13.8°C | 14.6°C | 15.5°C | 15.5°C | +2.1°C |
| Avg Rain | 94 mm | 109 mm | 106 mm | 93 mm | 111 mm | +18 mm |
September temperatures in Staten Island have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.9°C (1991) to a record high of 35.7°C (2010).
Rainfall in September is about average for rainfall, averaging 102 mm, with a wettest year of 236 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.7°C per decade, narrowing the gap between day and night.
One of the best times to visit Staten Island
September is one of the best times to visit Staten Island. Expect days averaging 25°C and nights around 14.5°C (mean 19.8°C) — warmer than Staten Island's yearly average — with higher rainfall (102 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 | 26.8°C | 21.4°C | 16.1°C | 30.6°C | 12.6°C | 66 mm | 71% | 1.1 m/s | 4.4 |
| 2024 | 25.3°C | 20.3°C | 15.4°C | 28.8°C | 9.5°C | 30 mm | 74% | 1.2 m/s | 4.2 |
| 2023 | 25.4°C | 20.7°C | 16.0°C | 35.0°C | 11.1°C | 222 mm | 78% | 1.3 m/s | 4.1 |
| 2022 | 26.2°C | 20.8°C | 15.3°C | 31.7°C | 7.1°C | 84 mm | 69% | 1.2 m/s | 4.5 |
| 2021 | 24.3°C | 20.0°C | 15.7°C | 28.4°C | 10.4°C | 176 mm | 83% | 1.3 m/s | 4.4 |
| 2020 | 24.9°C | 19.8°C | 14.7°C | 29.9°C | 6.3°C | 90 mm | 74% | 1.2 m/s | 4.3 |
| 2019 | 26.8°C | 21.1°C | 15.4°C | 31.5°C | 9.1°C | 23 mm | 71% | 1.1 m/s | 4.5 |
| 2018 | 25.3°C | 21.4°C | 17.4°C | 34.2°C | 10.7°C | 195 mm | 85% | 1.2 m/s | 3.3 |
| 2017 | 25.8°C | 20.6°C | 15.4°C | 32.3°C | 10.1°C | 57 mm | 74% | 1.2 m/s | 4.4 |
| 2016 | 27.0°C | 21.7°C | 16.4°C | 34.2°C | 10.1°C | 76 mm | 68% | 1.3 m/s | 4.3 |
| 2015 | 27.8°C | 22.1°C | 16.3°C | 34.5°C | 12.1°C | 82 mm | 70% | 1.2 m/s | 4.6 |
| 2014 | 25.8°C | 20.4°C | 15.0°C | 32.7°C | 8.3°C | 38 mm | 69% | 1.1 m/s | 4.4 |
| 2013 | 24.4°C | 18.4°C | 12.4°C | 32.9°C | 6.2°C | 56 mm | 71% | 1.1 m/s | 4.9 |
| 2012 | 25.1°C | 19.9°C | 14.8°C | 33.2°C | 8.4°C | 109 mm | 74% | 1.2 m/s | 4.3 |
| 2011 | 24.2°C | 20.2°C | 16.1°C | 28.3°C | 7.4°C | 189 mm | 87% | 1.1 m/s | 3.4 |
| 2010 | 27.2°C | 21.5°C | 15.7°C | 35.7°C | 9.5°C | 101 mm | 67% | 1.4 m/s | 4.5 |
| 2009 | 23.2°C | 18.5°C | 13.8°C | 29.0°C | 7.2°C | 76 mm | 77% | 1.3 m/s | 4.1 |
| 2008 | 25.1°C | 20.2°C | 15.3°C | 33.6°C | 9.2°C | 178 mm | 77% | 1.2 m/s | 4.3 |
| 2007 | 26.9°C | 20.9°C | 15.0°C | 31.9°C | 8.9°C | 26 mm | 69% | 1.1 m/s | 5 |
| 2006 | 23.1°C | 18.5°C | 13.8°C | 27.7°C | 8.2°C | 124 mm | 79% | 1.3 m/s | 3.9 |
| 2005 🔥 | 28.9°C | 22.6°C | 16.3°C | 34.3°C | 8.2°C | 33 mm | 61% | 1.2 m/s | 4.9 |
| 2004 | 25.4°C | 20.5°C | 15.6°C | 29.3°C | 8.9°C | 165 mm | 79% | 1.2 m/s | 4 |
| 2003 | 23.6°C | 19.4°C | 15.2°C | 27.3°C | 7.6°C | 148 mm | 82% | 1.3 m/s | 3.9 |
| 2002 | 26.3°C | 20.6°C | 15.0°C | 33.3°C | 10.8°C | 106 mm | 71% | 1.2 m/s | 4.7 |
| 2001 | 25.1°C | 19.2°C | 13.3°C | 30.4°C | 8.0°C | 81 mm | 68% | 1.3 m/s | 4.6 |
| 2000 | 23.5°C | 18.1°C | 12.8°C | 30.5°C | 5.0°C | 125 mm | 76% | 1.2 m/s | 4.3 |
| 1999 🌧️ | 24.2°C | 19.4°C | 14.7°C | 29.9°C | 7.0°C | 236 mm | 80% | 1.3 m/s | 4.1 |
| 1998 | 26.7°C | 20.7°C | 14.7°C | 32.3°C | 6.8°C | 60 mm | 69% | 1.2 m/s | 4.4 |
| 1997 | 24.1°C | 18.7°C | 13.2°C | 29.5°C | 6.2°C | 59 mm | 71% | 1.3 m/s | 4.4 |
| 1996 | 24.0°C | 19.3°C | 14.6°C | 31.0°C | 7.4°C | 143 mm | 79% | 1.3 m/s | 3.8 |
| 1995 | 24.7°C | 19.3°C | 13.8°C | 30.9°C | 8.1°C | 111 mm | 66% | 1.3 m/s | 4.3 |
| 1994 | 23.8°C | 18.3°C | 12.7°C | 29.2°C | 8.6°C | 68 mm | 73% | 1.3 m/s | 4.3 |
| 1993 | 24.1°C | 19.2°C | 14.4°C | 32.2°C | 5.9°C | 152 mm | 76% | 1.2 m/s | 3.4 |
| 1992 | 23.7°C | 18.8°C | 13.9°C | 29.3°C | 5.6°C | 91 mm | 75% | 1.4 m/s | 3.9 |
| 1991 | 24.6°C | 19.1°C | 13.5°C | 33.4°C | 4.9°C | 107 mm | 68% | 1.3 m/s | 4.5 |
| 1990 | 23.6°C | 18.3°C | 12.9°C | 30.6°C | 5.2°C | 57 mm | 75% | 1.2 m/s | 4.3 |
| 1989 | 24.1°C | 19.3°C | 14.4°C | 32.7°C | 5.7°C | 179 mm | 78% | 1.3 m/s | 4 |
| 1988 | 24.1°C | 18.1°C | 12.2°C | 28.6°C | 7.3°C | 68 mm | 71% | 1.1 m/s | 4.5 |
| 1987 | 23.4°C | 18.6°C | 13.8°C | 27.8°C | 6.7°C | 117 mm | 82% | 1.2 m/s | 4.2 |
| 1986 | 24.5°C | 19.0°C | 13.5°C | 30.0°C | 5.8°C | 63 mm | 72% | 1.2 m/s | 4.1 |
| 1985 | 25.9°C | 20.1°C | 14.2°C | 33.1°C | 7.7°C | 125 mm | 68% | 1.2 m/s | 4.6 |
| 1984 ❄️ | 22.6°C | 17.0°C | 11.4°C | 28.8°C | 5.8°C | 63 mm | 73% | 1.2 m/s | 4.9 |
| 1983 | 26.6°C | 20.3°C | 14.1°C | 35.0°C | 6.9°C | 82 mm | 63% | 1.2 m/s | — |
| 1982 | 25.1°C | 19.3°C | 13.5°C | 31.0°C | 9.7°C | 61 mm | 69% | 1.1 m/s | — |
| 1981 | 23.9°C | 18.6°C | 13.3°C | 31.2°C | 6.5°C | 85 mm | 70% | 1.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 25°C with lows near 14.5°C (mean 19.8°C), based on 45 years of NASA POWER data.
September averages 102 mm of rainfall in Staten Island, about average for rainfall. The wettest on record was 236 mm in 1999.
The hottest September reached 35.7°C in 2010. The coldest dipped to 4.9°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 24.8°C to 25.6°C and overnight lows from 13.3°C to 15.7°C over the same span.
September is one of the warmer months of the year in Staten Island and about average for rainfall, so plan for around 25°C daytime highs and 14.5°C at night.
Not quite — September is the 9th coolest month in Staten Island, averaging 19.8°C.
For September in Staten Island, pack light layers you can adjust through the day, with typical highs of 25°C and lows of 14.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 73% — moderately humid.
Average wind speed in September is 1.2 m/s. The windiest September on record averaged 1.4 m/s (1992).
The wettest September on record was 1999 with 236 mm. On average, September sees 102 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 Staten Island 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.
