September is one of the warmer months of the year in Mobile, with average highs near 29.5°C and lows around 23.2°C (mean 26.4°C). It is about average for rainfall, averaging 136 mm of rainfall and 76% relative humidity across the period.
September is one of the warmer months of the year in Mobile. Across 45 years of records, the warmest September in Mobile was 2019 — when the month averaged 28.8°C — while the coldest was 1983 at 24.6°C. Typical September days reach 29.5°C with nights near 23.2°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Mobile, averaging 136 mm of rainfall. The wettest September on record was 1998 with 564 mm, while the driest was 1984 at 19 mm.
Relative humidity in Mobile during September averages 76%. The most humid September was 1988 at 85%, and the least humid was 2025 at 66%.
September receives about 5.2 kWh/m²/day of solar energy in Mobile. The sunniest September was 2010 at 5.9 kWh/m²/day, and the cloudiest were 1988 and 1998 at 4.1.
Average wind speed in Mobile during September is 2.5 m/s. The windiest September was 1998 at 3.9 m/s, while the calmest were 1981, 2016 and 2025 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.6°C | 26.4°C | 26.2°C | 26.9°C | 26.9°C | +1.3°C |
| Avg High | 28.7°C | 29.6°C | 29.3°C | 30.0°C | 30.1°C | +1.4°C |
| Avg Low | 22.6°C | 23.1°C | 23.1°C | 23.8°C | 23.6°C | +1°C |
| Avg Rain | 138 mm | 131 mm | 147 mm | 124 mm | 145 mm | +7 mm |
September temperatures in Mobile have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 12.7°C (1983) to a record high of 35.4°C (1990).
Rainfall in September is about average for rainfall, averaging 136 mm, with a wettest year of 564 mm.
A good time to visit Mobile
September is a good time to visit Mobile, with days averaging 29.5°C and nights around 23.2°C (mean 26.4°C, warmer than Mobile's yearly average) and higher rainfall. October and May are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.8°C | 27.9°C | 24.0°C | 33.6°C | 20.6°C | 33 mm | 66% | 2 m/s | 5.8 |
| 2024 | 30.3°C | 27.3°C | 24.2°C | 35.3°C | 21.1°C | 172 mm | 77% | 2.5 m/s | 4.6 |
| 2023 | 32.0°C | 28.4°C | 24.7°C | 34.7°C | 20.9°C | 66 mm | 68% | 2.3 m/s | 5.5 |
| 2022 | 29.8°C | 26.2°C | 22.7°C | 33.2°C | 14.6°C | 47 mm | 74% | 2.2 m/s | 5.7 |
| 2021 | 28.3°C | 25.8°C | 23.2°C | 31.9°C | 16.6°C | 256 mm | 81% | 2.4 m/s | 4.7 |
| 2020 | 28.5°C | 25.7°C | 22.9°C | 32.9°C | 16.2°C | 299 mm | 82% | 3.6 m/s | 4.6 |
| 2019 🔥 | 32.5°C | 28.8°C | 25.0°C | 34.8°C | 23.7°C | 21 mm | 71% | 2.4 m/s | 5.8 |
| 2018 | 30.3°C | 28.0°C | 25.6°C | 33.4°C | 23.9°C | 220 mm | 80% | 2.2 m/s | 5.1 |
| 2017 | 29.0°C | 25.8°C | 22.6°C | 31.4°C | 18.0°C | 49 mm | 78% | 2.3 m/s | 5.8 |
| 2016 | 30.8°C | 27.8°C | 24.7°C | 34.1°C | 17.8°C | 117 mm | 75% | 2 m/s | 5.3 |
| 2015 | 29.9°C | 26.4°C | 23.0°C | 33.5°C | 18.0°C | 172 mm | 76% | 2.3 m/s | 5.1 |
| 2014 | 30.1°C | 27.1°C | 24.2°C | 32.1°C | 19.1°C | 76 mm | 77% | 2.1 m/s | 5.1 |
| 2013 | 30.1°C | 27.2°C | 24.3°C | 32.3°C | 21.1°C | 78 mm | 77% | 2.3 m/s | 5.3 |
| 2012 | 28.6°C | 25.6°C | 22.6°C | 31.6°C | 18.2°C | 174 mm | 79% | 2.5 m/s | 5.4 |
| 2011 | 28.2°C | 25.1°C | 21.9°C | 30.7°C | 16.8°C | 275 mm | 77% | 2.8 m/s | 5.1 |
| 2010 | 30.5°C | 27.1°C | 23.8°C | 34.1°C | 17.9°C | 55 mm | 73% | 2.3 m/s | 5.9 |
| 2009 | 29.0°C | 26.5°C | 24.1°C | 31.2°C | 17.1°C | 215 mm | 82% | 2.5 m/s | 4.8 |
| 2008 | 28.4°C | 25.5°C | 22.6°C | 31.3°C | 16.6°C | 134 mm | 80% | 3.2 m/s | 5 |
| 2007 | 30.3°C | 27.0°C | 23.7°C | 32.0°C | 18.7°C | 106 mm | 75% | 2.6 m/s | 5.3 |
| 2006 | 29.5°C | 26.3°C | 23.1°C | 32.2°C | 16.6°C | 104 mm | 71% | 2.3 m/s | 5.4 |
| 2005 | 30.9°C | 27.3°C | 23.6°C | 34.4°C | 20.5°C | 63 mm | 76% | 2.7 m/s | 5.5 |
| 2004 | 29.7°C | 26.1°C | 22.6°C | 32.6°C | 18.6°C | 115 mm | 77% | 3.3 m/s | 5.4 |
| 2003 | 28.2°C | 25.4°C | 22.5°C | 31.4°C | 14.7°C | 110 mm | 79% | 2.6 m/s | 5.4 |
| 2002 | 29.7°C | 27.1°C | 24.4°C | 34.4°C | 21.3°C | 347 mm | 83% | 3.1 m/s | 4.6 |
| 2001 | 28.1°C | 25.0°C | 22.0°C | 31.0°C | 13.8°C | 113 mm | 77% | 2.5 m/s | 5.2 |
| 2000 | 29.1°C | 25.9°C | 22.7°C | 35.3°C | 13.9°C | 158 mm | 77% | 2.8 m/s | 5.1 |
| 1999 | 30.1°C | 25.9°C | 21.7°C | 32.6°C | 15.1°C | 55 mm | 69% | 2.8 m/s | 5.3 |
| 1998 🌧️ | 28.9°C | 26.5°C | 24.1°C | 33.3°C | 21.7°C | 564 mm | 84% | 3.9 m/s | 4.1 |
| 1997 | 30.3°C | 27.0°C | 23.7°C | 33.5°C | 19.4°C | 34 mm | 74% | 2.1 m/s | 5.6 |
| 1996 | 29.3°C | 26.1°C | 23.0°C | 31.8°C | 16.5°C | 116 mm | 75% | 2.4 m/s | 5.3 |
| 1995 | 30.4°C | 26.5°C | 22.6°C | 33.4°C | 16.4°C | 53 mm | 74% | 2.4 m/s | 5.5 |
| 1994 | 28.9°C | 25.7°C | 22.5°C | 31.8°C | 16.2°C | 105 mm | 77% | 2.5 m/s | 5.5 |
| 1993 | 29.6°C | 26.7°C | 23.8°C | 33.0°C | 14.4°C | 148 mm | 76% | 2.1 m/s | 4.7 |
| 1992 | 28.7°C | 26.1°C | 23.5°C | 32.4°C | 17.8°C | 96 mm | 80% | 2.6 m/s | 4.2 |
| 1991 | 28.5°C | 25.5°C | 22.5°C | 33.0°C | 15.4°C | 82 mm | 80% | 2.5 m/s | 4.9 |
| 1990 | 31.0°C | 27.5°C | 23.9°C | 35.4°C | 15.8°C | 59 mm | 67% | 2.3 m/s | 5.4 |
| 1989 | 29.1°C | 25.9°C | 22.6°C | 34.7°C | 15.1°C | 125 mm | 77% | 2.7 m/s | 5 |
| 1988 | 28.6°C | 26.1°C | 23.7°C | 32.3°C | 16.6°C | 376 mm | 85% | 2.8 m/s | 4.1 |
| 1987 | 28.8°C | 25.9°C | 22.9°C | 31.7°C | 18.0°C | 62 mm | 76% | 2.2 m/s | 5.2 |
| 1986 | 29.7°C | 27.0°C | 24.3°C | 31.9°C | 19.5°C | 114 mm | 79% | 2.2 m/s | 5.1 |
| 1985 | 28.2°C | 25.2°C | 22.2°C | 32.9°C | 15.4°C | 237 mm | 79% | 2.9 m/s | 5.1 |
| 1984 | 28.4°C | 25.2°C | 22.0°C | 31.8°C | 15.7°C | 19 mm | 76% | 2.7 m/s | 5.2 |
| 1983 ❄️ | 27.7°C | 24.6°C | 21.6°C | 32.4°C | 12.7°C | 190 mm | 77% | 2.7 m/s | — |
| 1982 | 28.0°C | 25.0°C | 22.0°C | 31.8°C | 14.4°C | 62 mm | 76% | 2.3 m/s | — |
| 1981 | 29.4°C | 25.7°C | 21.9°C | 31.8°C | 14.0°C | 59 mm | 67% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.5°C with lows near 23.2°C (mean 26.4°C), based on 45 years of NASA POWER data.
September averages 136 mm of rainfall in Mobile, about average for rainfall. The wettest on record was 564 mm in 1998.
The hottest September reached 35.4°C in 1990. The coldest dipped to 12.7°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2°C. Daytime highs moved from 28.3°C to 30.4°C and overnight lows from 21.9°C to 23.8°C over the same span.
September is one of the warmer months of the year in Mobile and about average for rainfall, so plan for around 29.5°C daytime highs and 23.2°C at night.
Not quite — September is the 9th coolest month in Mobile, averaging 26.4°C.
For September in Mobile, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 23.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 76% — quite humid.
Average wind speed in September is 2.5 m/s. The windiest September on record averaged 3.9 m/s (1998).
The wettest September on record was 1998 with 564 mm. On average, September sees 136 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 Mobile 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.
