September is one of the warmer months of the year in Bessemer, with average highs near 30.7°C and lows around 17.6°C (mean 24.2°C). It is one of the drier months, averaging 88 mm of rainfall and 69% relative humidity across the period.
September is one of the warmer months of the year in Bessemer. Across 45 years of records, the warmest September in Bessemer was 2019 — when the month averaged 28.8°C — while the coldest was 2001 at 21.5°C. Typical September days reach 30.7°C with nights near 17.6°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Bessemer, averaging 88 mm of rainfall. The wettest September on record was 1988 with 249 mm, while the driest was 2019 at 7 mm.
Relative humidity in Bessemer during September averages 69%. The most humid September was 2009 at 86%, and the least humid was 1999 at 50%.
September receives about 4.9 kWh/m²/day of solar energy in Bessemer. The sunniest Septembers were 2010 and 2019 at 5.7 kWh/m²/day, and the cloudiest were 1988 and 2009 at 3.9.
Average wind speed in Bessemer during September is 0.2 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.2 m/s, while the calmest was 1988 at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.4°C | 24.1°C | 23.9°C | 25.0°C | 24.5°C | +1.1°C |
| Avg High | 29.8°C | 31.0°C | 30.1°C | 31.6°C | 31.1°C | +1.3°C |
| Avg Low | 16.9°C | 17.3°C | 17.7°C | 18.4°C | 18.0°C | +1.1°C |
| Avg Rain | 94 mm | 86 mm | 110 mm | 74 mm | 68 mm | -26 mm |
September temperatures in Bessemer have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.9°C (1983) to a record high of 39.8°C (1990).
Rainfall in September is one of the drier months, averaging 88 mm, with a wettest year of 249 mm.
One of the best times to visit Bessemer
September is one of the best times to visit Bessemer. Expect days averaging 30.7°C and nights around 17.6°C (mean 24.2°C) — warmer than Bessemer's yearly average — with higher rainfall (88 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 | 33.5°C | 26.0°C | 18.6°C | 36.5°C | 14.2°C | 42 mm | 59% | 0.2 m/s | 5.2 |
| 2024 | 30.6°C | 24.5°C | 18.5°C | 37.1°C | 14.0°C | 143 mm | 71% | 0.2 m/s | 4.4 |
| 2023 | 32.5°C | 25.3°C | 18.1°C | 35.8°C | 12.9°C | 38 mm | 65% | 0.2 m/s | 5.1 |
| 2022 | 30.5°C | 23.6°C | 16.8°C | 37.0°C | 9.8°C | 60 mm | 67% | 0.2 m/s | 5.3 |
| 2021 | 29.0°C | 23.3°C | 17.7°C | 32.8°C | 8.8°C | 74 mm | 78% | 0.2 m/s | 4.8 |
| 2020 | 30.7°C | 24.4°C | 18.1°C | 35.4°C | 10.3°C | 53 mm | 69% | 0.2 m/s | 4.7 |
| 2019 🔥 | 36.4°C | 28.8°C | 21.1°C | 39.8°C | 17.0°C | 7 mm | 56% | 0.2 m/s | 5.7 |
| 2018 | 33.4°C | 27.4°C | 21.3°C | 37.6°C | 18.0°C | 102 mm | 71% | 0.2 m/s | 4.7 |
| 2017 | 29.7°C | 23.2°C | 16.6°C | 34.1°C | 10.1°C | 71 mm | 72% | 0.2 m/s | 5.3 |
| 2016 | 34.2°C | 27.1°C | 20.0°C | 37.6°C | 10.6°C | 23 mm | 60% | 0.2 m/s | 5.5 |
| 2015 | 30.3°C | 23.9°C | 17.6°C | 35.5°C | 10.0°C | 37 mm | 73% | 0.2 m/s | 5 |
| 2014 | 31.7°C | 25.3°C | 18.9°C | 36.2°C | 11.9°C | 56 mm | 70% | 0.2 m/s | 5 |
| 2013 | 29.9°C | 23.6°C | 17.2°C | 33.7°C | 11.4°C | 63 mm | 77% | 0.2 m/s | 5.2 |
| 2012 | 29.2°C | 22.9°C | 16.6°C | 36.1°C | 7.9°C | 152 mm | 73% | 0.2 m/s | 4.8 |
| 2011 | 27.6°C | 21.9°C | 16.2°C | 37.6°C | 9.9°C | 197 mm | 76% | 0.2 m/s | 4.6 |
| 2010 | 33.3°C | 25.7°C | 18.1°C | 38.5°C | 10.1°C | 30 mm | 59% | 0.2 m/s | 5.7 |
| 2009 | 27.9°C | 23.4°C | 18.9°C | 31.8°C | 8.6°C | 245 mm | 86% | 0.2 m/s | 3.9 |
| 2008 | 29.1°C | 23.4°C | 17.7°C | 32.9°C | 10.1°C | 41 mm | 76% | 0.2 m/s | 4.7 |
| 2007 | 32.0°C | 25.2°C | 18.4°C | 36.2°C | 9.9°C | 68 mm | 65% | 0.2 m/s | 5.1 |
| 2006 | 29.7°C | 22.8°C | 15.9°C | 33.9°C | 7.8°C | 106 mm | 66% | 0.2 m/s | 5 |
| 2005 | 33.2°C | 25.9°C | 18.5°C | 37.4°C | 11.8°C | 56 mm | 64% | 0.2 m/s | 5.2 |
| 2004 | 29.0°C | 23.2°C | 17.4°C | 33.9°C | 9.9°C | 166 mm | 75% | 0.2 m/s | 5.1 |
| 2003 | 29.1°C | 22.7°C | 16.3°C | 33.6°C | 6.9°C | 49 mm | 75% | 0.2 m/s | 5.4 |
| 2002 | 32.1°C | 26.2°C | 20.3°C | 38.5°C | 15.5°C | 191 mm | 70% | 0.2 m/s | 4.1 |
| 2001 ❄️ | 27.4°C | 21.5°C | 15.6°C | 32.6°C | 4.9°C | 133 mm | 78% | 0.2 m/s | 4.8 |
| 2000 | 31.4°C | 24.5°C | 17.5°C | 37.4°C | 8.3°C | 45 mm | 59% | 0.2 m/s | 4.7 |
| 1999 | 32.4°C | 24.4°C | 16.4°C | 39.0°C | 7.4°C | 36 mm | 50% | 0.2 m/s | 5.1 |
| 1998 | 33.5°C | 26.5°C | 19.5°C | 39.1°C | 13.6°C | 43 mm | 60% | 0.2 m/s | 5 |
| 1997 | 31.4°C | 24.4°C | 17.4°C | 36.8°C | 11.4°C | 99 mm | 66% | 0.2 m/s | 5.2 |
| 1996 | 29.3°C | 22.7°C | 16.2°C | 35.2°C | 8.4°C | 118 mm | 73% | 0.2 m/s | 4.6 |
| 1995 | 31.2°C | 24.2°C | 17.2°C | 37.1°C | 10.1°C | 104 mm | 65% | 0.2 m/s | 4.7 |
| 1994 | 29.1°C | 22.7°C | 16.2°C | 33.4°C | 8.1°C | 119 mm | 75% | 0.2 m/s | 5 |
| 1993 | 30.9°C | 23.8°C | 16.7°C | 35.7°C | 7.1°C | 83 mm | 67% | 0.2 m/s | 4.8 |
| 1992 | 27.9°C | 22.7°C | 17.4°C | 32.4°C | 8.1°C | 117 mm | 82% | 0.2 m/s | 4.4 |
| 1991 | 30.2°C | 23.9°C | 17.5°C | 36.9°C | 6.5°C | 95 mm | 71% | 0.2 m/s | 5.1 |
| 1990 | 33.6°C | 26.1°C | 18.6°C | 39.8°C | 7.2°C | 45 mm | 56% | 0.2 m/s | 5.2 |
| 1989 | 27.7°C | 22.3°C | 16.9°C | 32.3°C | 8.5°C | 171 mm | 83% | 0.2 m/s | 4 |
| 1988 🌧️ | 28.7°C | 23.4°C | 18.2°C | 33.1°C | 10.0°C | 249 mm | 82% | 0.1 m/s | 3.9 |
| 1987 | 30.5°C | 23.9°C | 17.3°C | 34.4°C | 11.0°C | 79 mm | 64% | 0.2 m/s | 4.8 |
| 1986 | 31.1°C | 25.1°C | 19.2°C | 35.7°C | 13.8°C | 86 mm | 75% | 0.2 m/s | 4.7 |
| 1985 | 29.7°C | 23.1°C | 16.6°C | 34.1°C | 7.6°C | 78 mm | 68% | 0.2 m/s | 5 |
| 1984 | 30.9°C | 23.3°C | 15.7°C | 36.4°C | 10.0°C | 12 mm | 59% | 0.2 m/s | 5.1 |
| 1983 | 28.1°C | 22.2°C | 16.2°C | 35.5°C | 4.9°C | 109 mm | 73% | 0.2 m/s | — |
| 1982 | 30.7°C | 23.6°C | 16.4°C | 35.3°C | 7.7°C | 33 mm | 64% | 0.2 m/s | — |
| 1981 | 31.0°C | 23.4°C | 15.8°C | 34.6°C | 7.1°C | 32 mm | 60% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.7°C with lows near 17.6°C (mean 24.2°C), based on 45 years of NASA POWER data.
September averages 88 mm of rainfall in Bessemer, one of the drier months. The wettest on record was 249 mm in 1988.
The hottest September reached 39.8°C in 1990. The coldest dipped to 4.9°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 30.1°C to 31.2°C and overnight lows from 16.1°C to 17.9°C over the same span.
September is one of the warmer months of the year in Bessemer and one of the drier months, so plan for around 30.7°C daytime highs and 17.6°C at night.
Not quite — September is the 9th coolest month in Bessemer, averaging 24.2°C.
For September in Bessemer, pack light, breathable clothing and sun protection, with typical highs of 30.7°C and lows of 17.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 69% — moderately humid.
Average wind speed in September is 0.2 m/s. The windiest September on record averaged 0.2 m/s (1981).
The wettest September on record was 1988 with 249 mm. On average, September sees 88 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 Bessemer 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.
