September is one of the warmer months of the year in Fall River, with average highs near 22.4°C and lows around 15.1°C (mean 18.8°C). It is about average for rainfall, averaging 100 mm of rainfall and 77% relative humidity across the period.
September is one of the warmer months of the year in Fall River. Across 45 years of records, the warmest September in Fall River was 2015 — when the month averaged 20.9°C — while the coldest was 1984 at 16.9°C. Typical September days reach 22.4°C with nights near 15.1°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Fall River, averaging 100 mm of rainfall. The wettest September on record was 2008 with 212 mm, while the driest was 1986 at 26 mm.
Relative humidity in Fall River during September averages 77%. The most humid September was 2011 at 85%, and the least humid was 1983 at 68%.
September receives about 4.4 kWh/m²/day of solar energy in Fall River. The sunniest September was 2007 at 5 kWh/m²/day, and the cloudiest was 1996 at 3.5.
Average wind speed in Fall River during September is 1.8 m/s. The windiest Septembers were 2017, 2021 and 2023, among others at 1.9 m/s, while the calmest was 2005 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.9°C | 18.1°C | 18.9°C | 19.5°C | 19.7°C | +1.8°C |
| Avg High | 21.8°C | 21.7°C | 22.5°C | 23.1°C | 23.2°C | +1.4°C |
| Avg Low | 13.9°C | 14.4°C | 15.2°C | 15.9°C | 16.2°C | +2.3°C |
| Avg Rain | 76 mm | 109 mm | 105 mm | 99 mm | 115 mm | +39 mm |
September temperatures in Fall River have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5°C (1991) to a record high of 31.7°C (2023).
Rainfall in September is about average for rainfall, averaging 100 mm, with a wettest year of 212 mm.
One of the best times to visit Fall River
September is one of the best times to visit Fall River. Expect days averaging 22.4°C and nights around 15.1°C (mean 18.8°C) — warmer than Fall River's yearly average — with higher rainfall (100 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 | 23.5°C | 19.9°C | 16.2°C | 27.3°C | 12.5°C | 84 mm | 78% | 1.6 m/s | 4.6 |
| 2024 | 22.7°C | 19.1°C | 15.5°C | 27.1°C | 13.1°C | 57 mm | 78% | 1.8 m/s | 4.3 |
| 2023 | 23.3°C | 20.1°C | 16.9°C | 31.7°C | 11.4°C | 187 mm | 82% | 1.9 m/s | 4 |
| 2022 | 23.0°C | 19.4°C | 15.8°C | 28.7°C | 9.1°C | 143 mm | 77% | 1.8 m/s | 4.3 |
| 2021 | 23.5°C | 20.2°C | 17.0°C | 26.1°C | 11.4°C | 188 mm | 80% | 1.9 m/s | 4.3 |
| 2020 | 22.9°C | 19.4°C | 15.9°C | 29.7°C | 8.6°C | 32 mm | 75% | 1.8 m/s | 4.4 |
| 2019 | 23.0°C | 19.1°C | 15.2°C | 28.0°C | 10.6°C | 47 mm | 76% | 1.8 m/s | 4.8 |
| 2018 | 23.1°C | 20.0°C | 17.0°C | 30.8°C | 11.0°C | 191 mm | 83% | 1.8 m/s | 3.7 |
| 2017 | 23.4°C | 19.6°C | 15.9°C | 27.8°C | 10.5°C | 93 mm | 79% | 1.9 m/s | 4.3 |
| 2016 | 23.6°C | 20.2°C | 16.9°C | 30.9°C | 8.6°C | 77 mm | 76% | 1.9 m/s | 4.1 |
| 2015 🔥 | 24.8°C | 20.9°C | 16.9°C | 30.4°C | 10.7°C | 127 mm | 78% | 1.6 m/s | 4.9 |
| 2014 | 23.4°C | 19.5°C | 15.5°C | 28.1°C | 9.9°C | 32 mm | 74% | 1.6 m/s | 4.7 |
| 2013 | 21.8°C | 17.7°C | 13.7°C | 27.4°C | 8.5°C | 61 mm | 76% | 1.7 m/s | 4.7 |
| 2012 | 22.4°C | 18.9°C | 15.3°C | 26.9°C | 9.5°C | 118 mm | 77% | 1.8 m/s | 4.3 |
| 2011 | 22.5°C | 19.4°C | 16.3°C | 26.0°C | 10.3°C | 161 mm | 85% | 1.6 m/s | 4.3 |
| 2010 | 23.2°C | 19.8°C | 16.3°C | 31.4°C | 10.4°C | 83 mm | 76% | 1.9 m/s | 4.5 |
| 2009 | 21.5°C | 17.8°C | 14.1°C | 27.3°C | 9.5°C | 52 mm | 77% | 1.8 m/s | 4.6 |
| 2008 🌧️ | 22.2°C | 18.9°C | 15.5°C | 27.1°C | 11.0°C | 212 mm | 81% | 1.7 m/s | 4.2 |
| 2007 | 23.5°C | 19.5°C | 15.4°C | 27.5°C | 10.3°C | 54 mm | 75% | 1.7 m/s | 5 |
| 2006 | 21.3°C | 17.9°C | 14.5°C | 24.3°C | 8.4°C | 68 mm | 80% | 1.9 m/s | 4.2 |
| 2005 | 24.3°C | 20.3°C | 16.2°C | 29.4°C | 9.3°C | 76 mm | 75% | 1.5 m/s | 4.9 |
| 2004 | 22.4°C | 18.8°C | 15.1°C | 27.5°C | 8.9°C | 179 mm | 80% | 1.7 m/s | 4.5 |
| 2003 | 22.3°C | 19.1°C | 15.8°C | 25.7°C | 10.5°C | 92 mm | 81% | 1.7 m/s | 4.3 |
| 2002 | 23.2°C | 19.6°C | 16.0°C | 30.5°C | 11.0°C | 133 mm | 80% | 1.8 m/s | 4.4 |
| 2001 | 22.5°C | 18.8°C | 15.0°C | 26.6°C | 10.6°C | 99 mm | 76% | 1.8 m/s | 4.8 |
| 2000 | 21.7°C | 17.9°C | 14.1°C | 26.8°C | 5.9°C | 85 mm | 77% | 1.8 m/s | 4.5 |
| 1999 | 22.8°C | 19.6°C | 16.4°C | 27.9°C | 10.2°C | 167 mm | 80% | 1.8 m/s | 4.1 |
| 1998 | 22.8°C | 18.8°C | 14.9°C | 26.2°C | 7.5°C | 70 mm | 76% | 1.6 m/s | 4.8 |
| 1997 | 21.8°C | 18.0°C | 14.3°C | 25.0°C | 7.0°C | 31 mm | 76% | 1.8 m/s | 4.3 |
| 1996 | 21.2°C | 18.1°C | 14.9°C | 29.6°C | 8.2°C | 183 mm | 82% | 1.8 m/s | 3.5 |
| 1995 | 21.9°C | 17.9°C | 13.9°C | 28.5°C | 9.5°C | 85 mm | 72% | 1.9 m/s | 4.3 |
| 1994 | 21.1°C | 17.4°C | 13.7°C | 25.8°C | 9.9°C | 97 mm | 77% | 1.8 m/s | 4.3 |
| 1993 | 21.8°C | 18.2°C | 14.5°C | 28.8°C | 6.6°C | 125 mm | 79% | 1.9 m/s | 3.6 |
| 1992 | 20.8°C | 17.4°C | 13.9°C | 25.0°C | 5.3°C | 114 mm | 79% | 1.8 m/s | 4.4 |
| 1991 | 20.8°C | 17.2°C | 13.7°C | 27.4°C | 5.0°C | 147 mm | 77% | 1.9 m/s | 4.2 |
| 1990 | 21.8°C | 18.0°C | 14.2°C | 28.1°C | 6.5°C | 67 mm | 76% | 1.8 m/s | 4.4 |
| 1989 | 21.7°C | 18.1°C | 14.5°C | 29.4°C | 5.4°C | 112 mm | 79% | 1.8 m/s | 4.5 |
| 1988 | 21.8°C | 17.5°C | 13.3°C | 26.0°C | 8.0°C | 65 mm | 72% | 1.7 m/s | 4.7 |
| 1987 | 21.0°C | 17.7°C | 14.4°C | 26.7°C | 8.5°C | 137 mm | 80% | 1.8 m/s | 4.1 |
| 1986 | 20.8°C | 17.1°C | 13.4°C | 24.9°C | 7.7°C | 26 mm | 76% | 1.8 m/s | 4.3 |
| 1985 | 21.9°C | 18.0°C | 14.1°C | 27.0°C | 8.3°C | 73 mm | 79% | 1.7 m/s | 4.5 |
| 1984 ❄️ | 21.0°C | 16.9°C | 12.7°C | 25.7°C | 8.1°C | 59 mm | 72% | 1.8 m/s | 4.7 |
| 1983 | 24.6°C | 20.1°C | 15.5°C | 30.7°C | 8.8°C | 50 mm | 68% | 1.7 m/s | — |
| 1982 | 22.0°C | 18.0°C | 14.0°C | 27.6°C | 11.1°C | 78 mm | 77% | 1.7 m/s | — |
| 1981 | 21.8°C | 17.6°C | 13.4°C | 26.7°C | 5.7°C | 83 mm | 74% | 1.9 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 15.1°C (mean 18.8°C), based on 45 years of NASA POWER data.
September averages 100 mm of rainfall in Fall River, about average for rainfall. The wettest on record was 212 mm in 2008.
The hottest September reached 31.7°C in 2023. The coldest dipped to 5°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 22.3°C to 23.2°C and overnight lows from 13.9°C to 16.3°C over the same span.
September is one of the warmer months of the year in Fall River and about average for rainfall, so plan for around 22.4°C daytime highs and 15.1°C at night.
Not quite — September is the 10th coolest month in Fall River, averaging 18.8°C.
For September in Fall River, pack light layers you can adjust through the day, with typical highs of 22.4°C and lows of 15.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 77% — quite humid.
Average wind speed in September is 1.8 m/s. The windiest September on record averaged 1.9 m/s (1981).
The wettest September on record was 2008 with 212 mm. On average, September sees 100 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 Fall River 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.
