September is one of the warmer months of the year in New Bedford, with average highs near 20.8°C and lows around 16.6°C (mean 18.7°C). It is about average for rainfall, averaging 97 mm of rainfall and 79% relative humidity across the period.
September is one of the warmer months of the year in New Bedford. Across 45 years of records, the warmest September in New Bedford was 2021 — when the month averaged 20.6°C — while the coldest was 1986 at 16.9°C. Typical September days reach 20.8°C with nights near 16.6°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in New Bedford, averaging 97 mm of rainfall. The wettest September on record was 1996 with 289 mm, while the driest was 1986 at 27 mm.
Relative humidity in New Bedford during September averages 79%. The most humid September was 1996 at 86%, and the least humid was 1984 at 73%.
September receives about 4.3 kWh/m²/day of solar energy in New Bedford. The sunniest September was 2005 at 4.9 kWh/m²/day, and the cloudiest was 1996 at 3.4.
Average wind speed in New Bedford during September is 4.7 m/s. The windiest September was 2010 at 5.4 m/s, while the calmest were 2005 and 2025 at 4.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.9°C | 18.0°C | 18.7°C | 19.4°C | 19.7°C | +1.8°C |
| Avg High | 20.2°C | 20.1°C | 20.7°C | 21.4°C | 21.7°C | +1.5°C |
| Avg Low | 15.6°C | 16.0°C | 16.6°C | 17.3°C | 17.8°C | +2.2°C |
| Avg Rain | 74 mm | 107 mm | 98 mm | 98 mm | 112 mm | +39 mm |
September temperatures in New Bedford have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7.1°C (1992) to a record high of 28.3°C (2023).
Rainfall in September is about average for rainfall, averaging 97 mm, with a wettest year of 289 mm.
One of the best times to visit New Bedford
September is one of the best times to visit New Bedford. Expect days averaging 20.8°C and nights around 16.6°C (mean 18.7°C) — warmer than New Bedford'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 | 21.6°C | 19.7°C | 17.7°C | 25.0°C | 15.1°C | 71 mm | 80% | 4.1 m/s | 4.4 |
| 2024 | 20.9°C | 19.0°C | 17.2°C | 24.1°C | 15.5°C | 113 mm | 79% | 4.6 m/s | 4.2 |
| 2023 | 21.8°C | 20.0°C | 18.2°C | 28.3°C | 13.5°C | 157 mm | 84% | 4.9 m/s | 4 |
| 2022 | 22.0°C | 19.8°C | 17.6°C | 26.9°C | 11.0°C | 101 mm | 75% | 4.5 m/s | 4.2 |
| 2021 🔥 | 22.7°C | 20.6°C | 18.5°C | 24.9°C | 13.5°C | 197 mm | 80% | 4.9 m/s | 4.3 |
| 2020 | 21.1°C | 19.2°C | 17.3°C | 26.4°C | 12.6°C | 35 mm | 78% | 5 m/s | 4.2 |
| 2019 | 21.0°C | 18.9°C | 16.7°C | 24.1°C | 13.2°C | 71 mm | 78% | 4.9 m/s | 4.8 |
| 2018 | 21.9°C | 20.1°C | 18.4°C | 26.9°C | 14.1°C | 124 mm | 81% | 4.8 m/s | 3.8 |
| 2017 | 20.9°C | 18.9°C | 17.0°C | 22.9°C | 13.5°C | 146 mm | 84% | 5.2 m/s | 4 |
| 2016 | 21.8°C | 20.0°C | 18.2°C | 27.3°C | 12.9°C | 98 mm | 79% | 5.1 m/s | 4 |
| 2015 | 22.7°C | 20.5°C | 18.3°C | 26.5°C | 13.9°C | 128 mm | 81% | 4.5 m/s | 4.8 |
| 2014 | 21.4°C | 19.3°C | 17.1°C | 26.0°C | 12.6°C | 39 mm | 77% | 4.3 m/s | 4.7 |
| 2013 | 20.3°C | 18.0°C | 15.7°C | 24.1°C | 10.6°C | 44 mm | 77% | 4.7 m/s | 4.6 |
| 2012 | 21.3°C | 19.2°C | 17.1°C | 24.6°C | 12.6°C | 111 mm | 77% | 4.8 m/s | 4.2 |
| 2011 | 21.2°C | 19.4°C | 17.5°C | 24.2°C | 12.3°C | 114 mm | 84% | 4.5 m/s | 4.2 |
| 2010 | 21.3°C | 19.4°C | 17.4°C | 27.1°C | 13.3°C | 102 mm | 80% | 5.4 m/s | 4.6 |
| 2009 | 20.1°C | 18.0°C | 15.9°C | 24.8°C | 11.6°C | 73 mm | 77% | 4.7 m/s | 4.5 |
| 2008 | 20.5°C | 18.7°C | 16.9°C | 24.7°C | 13.4°C | 194 mm | 81% | 4.7 m/s | 4.1 |
| 2007 | 21.2°C | 19.1°C | 16.9°C | 23.6°C | 12.8°C | 53 mm | 78% | 4.6 m/s | 4.8 |
| 2006 | 20.2°C | 18.2°C | 16.2°C | 23.2°C | 11.7°C | 54 mm | 79% | 4.8 m/s | 4.2 |
| 2005 | 22.0°C | 19.8°C | 17.6°C | 25.7°C | 11.7°C | 102 mm | 78% | 4.1 m/s | 4.9 |
| 2004 | 20.7°C | 18.5°C | 16.3°C | 24.7°C | 12.3°C | 171 mm | 81% | 4.6 m/s | 4.6 |
| 2003 | 20.6°C | 18.7°C | 16.8°C | 23.5°C | 13.6°C | 68 mm | 82% | 4.5 m/s | 4.3 |
| 2002 | 21.4°C | 19.3°C | 17.2°C | 25.5°C | 13.7°C | 132 mm | 82% | 4.9 m/s | 4.1 |
| 2001 | 20.7°C | 18.7°C | 16.8°C | 23.7°C | 13.7°C | 61 mm | 77% | 4.7 m/s | 4.6 |
| 2000 | 19.8°C | 17.7°C | 15.7°C | 24.3°C | 9.7°C | 69 mm | 80% | 4.8 m/s | 4.4 |
| 1999 | 21.6°C | 19.7°C | 17.7°C | 24.5°C | 12.2°C | 122 mm | 80% | 4.6 m/s | 4.3 |
| 1998 | 20.7°C | 18.5°C | 16.3°C | 23.7°C | 11.7°C | 70 mm | 78% | 4.3 m/s | 4.8 |
| 1997 | 20.1°C | 17.9°C | 15.8°C | 22.8°C | 10.8°C | 37 mm | 80% | 4.6 m/s | 4.1 |
| 1996 🌧️ | 19.3°C | 17.6°C | 15.9°C | 24.8°C | 11.3°C | 289 mm | 86% | 4.9 m/s | 3.4 |
| 1995 | 19.9°C | 17.8°C | 15.7°C | 25.8°C | 12.9°C | 65 mm | 74% | 4.9 m/s | 4.4 |
| 1994 | 19.6°C | 17.3°C | 15.1°C | 23.6°C | 11.8°C | 72 mm | 79% | 4.8 m/s | 4.2 |
| 1993 | 20.4°C | 18.3°C | 16.1°C | 25.3°C | 10.5°C | 96 mm | 80% | 5.1 m/s | 3.7 |
| 1992 | 19.4°C | 17.4°C | 15.4°C | 22.6°C | 7.1°C | 103 mm | 80% | 4.8 m/s | 4.1 |
| 1991 | 19.6°C | 17.5°C | 15.4°C | 24.5°C | 7.9°C | 151 mm | 76% | 5.1 m/s | 4.1 |
| 1990 | 20.4°C | 18.2°C | 16.1°C | 25.2°C | 10.8°C | 63 mm | 77% | 4.6 m/s | 4.2 |
| 1989 | 20.6°C | 18.3°C | 16.1°C | 27.7°C | 9.2°C | 108 mm | 78% | 4.6 m/s | 4.4 |
| 1988 | 20.2°C | 17.7°C | 15.1°C | 23.7°C | 11.1°C | 46 mm | 74% | 4.4 m/s | 4.5 |
| 1987 | 19.7°C | 17.7°C | 15.8°C | 24.8°C | 11.2°C | 170 mm | 81% | 4.9 m/s | 3.9 |
| 1986 ❄️ | 19.1°C | 16.9°C | 14.8°C | 22.0°C | 10.2°C | 27 mm | 79% | 4.7 m/s | 4.3 |
| 1985 | 20.3°C | 18.1°C | 15.8°C | 25.0°C | 11.2°C | 47 mm | 80% | 4.4 m/s | 4.5 |
| 1984 | 19.7°C | 17.3°C | 14.8°C | 23.8°C | 10.7°C | 55 mm | 73% | 4.5 m/s | 4.7 |
| 1983 | 22.1°C | 19.6°C | 17.1°C | 26.9°C | 13.2°C | 33 mm | 73% | 4.5 m/s | — |
| 1982 | 19.8°C | 17.6°C | 15.5°C | 24.9°C | 13.4°C | 102 mm | 81% | 4.4 m/s | — |
| 1981 | 20.2°C | 17.6°C | 15.1°C | 24.3°C | 8.6°C | 77 mm | 77% | 5.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.8°C with lows near 16.6°C (mean 18.7°C), based on 45 years of NASA POWER data.
September averages 97 mm of rainfall in New Bedford, about average for rainfall. The wettest on record was 289 mm in 1996.
The hottest September reached 28.3°C in 2023. The coldest dipped to 7.1°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 20.4°C to 21.8°C and overnight lows from 15.7°C to 17.8°C over the same span.
September is one of the warmer months of the year in New Bedford and about average for rainfall, so plan for around 20.8°C daytime highs and 16.6°C at night.
Not quite — September is the 10th coolest month in New Bedford, averaging 18.7°C.
For September in New Bedford, pack light layers you can adjust through the day, with typical highs of 20.8°C and lows of 16.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 79% — quite humid.
Average wind speed in September is 4.7 m/s. The windiest September on record averaged 5.4 m/s (2010).
The wettest September on record was 1996 with 289 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 New Bedford 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.
