September is one of the warmer months of the year in Bentonville, with average highs near 28.6°C and lows around 16°C (mean 22.3°C). It is about average for rainfall, averaging 107 mm of rainfall and 67% relative humidity across the period.
September is one of the warmer months of the year in Bentonville. Across 45 years of records, the warmest September in Bentonville was 2019 — when the month averaged 26°C — while the coldest was 1993 at 19.3°C. Typical September days reach 28.6°C with nights near 16°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Bentonville, averaging 107 mm of rainfall. The wettest September on record was 1986 with 353 mm, while the driest were 2004 and 2024 at 20 mm.
Relative humidity in Bentonville during September averages 67%. The most humid September was 2008 at 81%, and the least humid was 2000 at 49%.
September receives about 4.9 kWh/m²/day of solar energy in Bentonville. The sunniest September was 2004 at 5.7 kWh/m²/day, and the cloudiest was 1986 at 3.8.
Average wind speed in Bentonville during September is 1.3 m/s. The windiest Septembers were 1984 and 1986 at 1.6 m/s, while the calmest was 2025 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.8°C | 21.6°C | 22.0°C | 23.0°C | 23.7°C | +1.9°C |
| Avg High | 28.1°C | 27.8°C | 28.3°C | 29.2°C | 30.3°C | +2.2°C |
| Avg Low | 15.5°C | 15.4°C | 15.6°C | 16.9°C | 17.0°C | +1.5°C |
| Avg Rain | 114 mm | 145 mm | 105 mm | 88 mm | 68 mm | -46 mm |
September temperatures in Bentonville have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.5°C (1989) to a record high of 42.3°C (2000).
Rainfall in September is about average for rainfall, averaging 107 mm, with a wettest year of 353 mm.
One of the best times to visit Bentonville
September is one of the best times to visit Bentonville. Expect days averaging 28.6°C and nights around 16°C (mean 22.3°C) — warmer than Bentonville's yearly average — with higher rainfall (107 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 | 29.4°C | 23.5°C | 17.5°C | 35.0°C | 12.0°C | 122 mm | 68% | 1 m/s | 4.8 |
| 2024 | 30.6°C | 23.6°C | 16.5°C | 37.4°C | 10.5°C | 20 mm | 59% | 1.3 m/s | 5 |
| 2023 | 30.8°C | 24.0°C | 17.2°C | 37.0°C | 13.3°C | 125 mm | 65% | 1.2 m/s | 5.3 |
| 2022 | 30.7°C | 23.6°C | 16.6°C | 36.5°C | 8.6°C | 30 mm | 59% | 1.3 m/s | 5.6 |
| 2021 | 31.7°C | 24.9°C | 18.2°C | 35.8°C | 10.0°C | 60 mm | 59% | 1.4 m/s | 5.5 |
| 2020 | 28.7°C | 22.3°C | 15.9°C | 33.2°C | 6.8°C | 53 mm | 71% | 1.2 m/s | 4.7 |
| 2019 🔥 | 31.3°C | 26.0°C | 20.6°C | 35.6°C | 16.3°C | 92 mm | 72% | 1.3 m/s | 5.1 |
| 2018 | 29.2°C | 23.4°C | 17.6°C | 35.2°C | 9.1°C | 53 mm | 74% | 1.3 m/s | 4.5 |
| 2017 | 29.8°C | 23.2°C | 16.5°C | 33.9°C | 9.1°C | 30 mm | 63% | 1.3 m/s | 5.3 |
| 2016 | 29.7°C | 23.6°C | 17.5°C | 34.7°C | 8.9°C | 90 mm | 70% | 1.3 m/s | 5.4 |
| 2015 | 29.7°C | 23.6°C | 17.5°C | 34.9°C | 9.6°C | 55 mm | 68% | 1.3 m/s | 5.2 |
| 2014 | 28.4°C | 22.5°C | 16.5°C | 33.8°C | 8.3°C | 101 mm | 71% | 1.3 m/s | 4.8 |
| 2013 | 30.5°C | 23.5°C | 16.5°C | 36.6°C | 9.1°C | 65 mm | 63% | 1.3 m/s | 5.3 |
| 2012 | 28.5°C | 22.4°C | 16.3°C | 38.7°C | 9.2°C | 92 mm | 68% | 1.3 m/s | 4.8 |
| 2011 | 27.1°C | 20.4°C | 13.8°C | 38.2°C | 7.9°C | 98 mm | 59% | 1.4 m/s | 5 |
| 2010 | 27.3°C | 21.9°C | 16.5°C | 33.7°C | 8.5°C | 198 mm | 76% | 1.4 m/s | 5 |
| 2009 | 24.5°C | 19.8°C | 15.1°C | 29.7°C | 6.0°C | 215 mm | 81% | 1.3 m/s | 4.1 |
| 2008 | 25.3°C | 20.2°C | 15.2°C | 32.6°C | 7.8°C | 179 mm | 81% | 1.3 m/s | 4.7 |
| 2007 | 27.9°C | 22.5°C | 17.1°C | 33.6°C | 10.6°C | 148 mm | 75% | 1.3 m/s | 4.7 |
| 2006 | 26.4°C | 20.0°C | 13.5°C | 32.5°C | 6.4°C | 96 mm | 66% | 1.4 m/s | 5 |
| 2005 | 31.8°C | 25.1°C | 18.4°C | 35.7°C | 7.5°C | 74 mm | 64% | 1.3 m/s | 5.1 |
| 2004 | 30.6°C | 23.2°C | 15.8°C | 35.3°C | 11.0°C | 20 mm | 55% | 1.3 m/s | 5.7 |
| 2003 | 25.6°C | 19.8°C | 14.0°C | 29.7°C | 6.3°C | 85 mm | 73% | 1.3 m/s | 5.1 |
| 2002 | 31.2°C | 24.0°C | 16.7°C | 36.6°C | 8.6°C | 49 mm | 58% | 1.3 m/s | 5.3 |
| 2001 | 28.2°C | 21.4°C | 14.5°C | 35.8°C | 4.9°C | 98 mm | 64% | 1.3 m/s | 5.1 |
| 2000 | 31.5°C | 23.8°C | 16.0°C | 42.3°C | 4.9°C | 86 mm | 49% | 1.4 m/s | 5.3 |
| 1999 | 27.2°C | 20.6°C | 14.0°C | 36.8°C | 5.8°C | 107 mm | 62% | 1.3 m/s | 4.7 |
| 1998 | 31.9°C | 25.9°C | 19.9°C | 41.8°C | 14.2°C | 160 mm | 63% | 1.3 m/s | 5 |
| 1997 | 28.0°C | 21.7°C | 15.5°C | 33.7°C | 10.3°C | 125 mm | 69% | 1.3 m/s | 4.9 |
| 1996 | 27.0°C | 20.6°C | 14.2°C | 34.2°C | 4.8°C | 206 mm | 68% | 1.2 m/s | 4.5 |
| 1995 | 27.6°C | 21.2°C | 14.7°C | 37.7°C | 1.9°C | 84 mm | 62% | 1.5 m/s | 4.1 |
| 1994 | 27.1°C | 20.7°C | 14.4°C | 32.7°C | 6.8°C | 66 mm | 68% | 1.2 m/s | 4.9 |
| 1993 ❄️ | 25.3°C | 19.3°C | 13.3°C | 32.2°C | 5.1°C | 274 mm | 75% | 1.4 m/s | 4.6 |
| 1992 | 26.9°C | 20.7°C | 14.5°C | 33.5°C | 4.0°C | 152 mm | 73% | 1.4 m/s | 4.7 |
| 1991 | 25.8°C | 20.5°C | 15.1°C | 32.9°C | 5.3°C | 122 mm | 72% | 1.3 m/s | 4.5 |
| 1990 | 30.7°C | 24.4°C | 18.0°C | 39.5°C | 6.1°C | 148 mm | 61% | 1.2 m/s | 4.7 |
| 1989 | 25.6°C | 19.6°C | 13.6°C | 34.7°C | 1.5°C | 97 mm | 72% | 1.3 m/s | 4.3 |
| 1988 | 28.9°C | 22.2°C | 15.6°C | 35.9°C | 10.1°C | 165 mm | 67% | 1.3 m/s | 4.8 |
| 1987 | 27.3°C | 21.1°C | 14.9°C | 33.6°C | 7.9°C | 93 mm | 69% | 1.1 m/s | 4.8 |
| 1986 🌧️ | 27.5°C | 22.8°C | 18.1°C | 32.2°C | 11.1°C | 353 mm | 78% | 1.6 m/s | 3.8 |
| 1985 | 27.9°C | 21.8°C | 15.6°C | 38.4°C | 3.6°C | 111 mm | 66% | 1.5 m/s | 4.5 |
| 1984 | 27.6°C | 21.2°C | 14.7°C | 36.1°C | 2.2°C | 91 mm | 61% | 1.6 m/s | 4.6 |
| 1983 | 30.3°C | 23.2°C | 16.2°C | 36.5°C | 3.9°C | 42 mm | 55% | 1.5 m/s | — |
| 1982 | 29.0°C | 22.2°C | 15.4°C | 35.6°C | 5.7°C | 38 mm | 62% | 1.4 m/s | — |
| 1981 | 28.6°C | 22.0°C | 15.4°C | 33.2°C | 6.0°C | 41 mm | 64% | 1.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.6°C with lows near 16°C (mean 22.3°C), based on 45 years of NASA POWER data.
September averages 107 mm of rainfall in Bentonville, about average for rainfall. The wettest on record was 353 mm in 1986.
The hottest September reached 42.3°C in 2000. The coldest dipped to 1.5°C in 1989.
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 28.7°C to 30.6°C and overnight lows from 15.5°C to 17.2°C over the same span.
September is one of the warmer months of the year in Bentonville and about average for rainfall, so plan for around 28.6°C daytime highs and 16°C at night.
Not quite — September is the 9th coolest month in Bentonville, averaging 22.3°C.
For September in Bentonville, pack light layers you can adjust through the day, with typical highs of 28.6°C and lows of 16°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 67% — moderately humid.
Average wind speed in September is 1.3 m/s. The windiest September on record averaged 1.6 m/s (1984).
The wettest September on record was 1986 with 353 mm. On average, September sees 107 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 Bentonville 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.
