September is one of the warmer months of the year in Fort Myers, with average highs near 30°C and lows around 24.6°C (mean 27.3°C). It is a relatively wet time of year, averaging 188 mm of rainfall and 83% relative humidity across the period.
September is one of the warmer months of the year in Fort Myers. Across 45 years of records, the warmest September in Fort Myers was 2024 — when the month averaged 28.8°C — while the coldest was 1984 at 26°C. Typical September days reach 30°C with nights near 24.6°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Fort Myers, averaging 188 mm of rainfall. The wettest September on record was 2022 with 372 mm, while the driest was 2019 at 46 mm.
Relative humidity in Fort Myers during September averages 83%. The most humid September was 2004 at 85%, and the least humid was 1996 at 78%.
September receives about 5 kWh/m²/day of solar energy in Fort Myers. The sunniest September was 2019 at 5.7 kWh/m²/day, and the cloudiest was 1998 at 4.4.
Average wind speed in Fort Myers during September is 2.4 m/s. The windiest September was 2004 at 4.2 m/s, while the calmest were 2009, 2014 and 2015, among others at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.8°C | 27.1°C | 27.3°C | 27.5°C | 28.0°C | +1.2°C |
| Avg High | 29.5°C | 29.7°C | 29.9°C | 30.2°C | 30.7°C | +1.2°C |
| Avg Low | 24.0°C | 24.5°C | 24.6°C | 24.8°C | 25.3°C | +1.3°C |
| Avg Rain | 167 mm | 177 mm | 208 mm | 184 mm | 214 mm | +47 mm |
September temperatures in Fort Myers have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 18.3°C (1981) to a record high of 33.3°C (2020).
Rainfall in September is a relatively wet time of year, averaging 188 mm, with a wettest year of 372 mm.
A quieter season to visit Fort Myers
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Fort Myers. That said, September — with days averaging 30°C and nights around 24.6°C (mean 27.3°C) and higher rainfall (188 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.4°C | 27.7°C | 24.9°C | 31.8°C | 22.7°C | 139 mm | 83% | 2 m/s | 4.8 |
| 2024 🔥 | 31.3°C | 28.8°C | 26.3°C | 32.2°C | 24.6°C | 199 mm | 83% | 2.2 m/s | 5 |
| 2023 | 31.5°C | 28.4°C | 25.4°C | 33.1°C | 22.9°C | 199 mm | 79% | 1.8 m/s | 5.2 |
| 2022 🌧️ | 30.4°C | 27.7°C | 25.1°C | 33.3°C | 18.7°C | 372 mm | 82% | 2.1 m/s | 5 |
| 2021 | 30.3°C | 27.6°C | 24.9°C | 31.4°C | 21.6°C | 148 mm | 80% | 1.8 m/s | 5 |
| 2020 | 30.2°C | 27.6°C | 25.0°C | 33.3°C | 21.2°C | 226 mm | 84% | 2.4 m/s | 4.9 |
| 2019 | 30.8°C | 27.6°C | 24.3°C | 32.3°C | 20.9°C | 46 mm | 81% | 3.3 m/s | 5.7 |
| 2018 | 30.4°C | 27.7°C | 25.1°C | 32.3°C | 23.6°C | 152 mm | 84% | 2.1 m/s | 5.6 |
| 2017 | 30.1°C | 27.5°C | 24.8°C | 31.7°C | 22.6°C | 318 mm | 83% | 2.5 m/s | 5.1 |
| 2016 | 30.3°C | 27.8°C | 25.4°C | 32.1°C | 23.8°C | 201 mm | 83% | 1.9 m/s | 5 |
| 2015 | 29.9°C | 27.6°C | 25.3°C | 31.7°C | 24.1°C | 218 mm | 84% | 1.7 m/s | 4.5 |
| 2014 | 29.7°C | 27.2°C | 24.7°C | 32.4°C | 23.4°C | 229 mm | 83% | 1.7 m/s | 4.6 |
| 2013 | 29.7°C | 27.0°C | 24.3°C | 31.4°C | 21.9°C | 197 mm | 84% | 2.2 m/s | 4.8 |
| 2012 | 29.5°C | 26.7°C | 23.9°C | 31.9°C | 21.0°C | 168 mm | 82% | 2.3 m/s | 5.1 |
| 2011 | 30.6°C | 27.8°C | 25.0°C | 32.2°C | 23.1°C | 170 mm | 80% | 2.1 m/s | 5.2 |
| 2010 | 30.8°C | 27.8°C | 24.8°C | 32.3°C | 22.4°C | 143 mm | 81% | 2.6 m/s | 5.4 |
| 2009 | 30.0°C | 27.6°C | 25.1°C | 31.6°C | 21.9°C | 191 mm | 83% | 1.7 m/s | 5 |
| 2008 | 29.9°C | 27.0°C | 24.1°C | 31.8°C | 20.3°C | 163 mm | 83% | 2.9 m/s | 5.1 |
| 2007 | 30.5°C | 27.6°C | 24.8°C | 32.6°C | 22.5°C | 182 mm | 80% | 2.4 m/s | 5.2 |
| 2006 | 30.0°C | 27.3°C | 24.5°C | 31.5°C | 19.7°C | 190 mm | 81% | 2 m/s | 5.3 |
| 2005 | 30.0°C | 27.2°C | 24.4°C | 31.4°C | 22.7°C | 132 mm | 84% | 2.7 m/s | 5.2 |
| 2004 | 29.8°C | 27.3°C | 24.8°C | 31.4°C | 21.4°C | 205 mm | 85% | 4.2 m/s | 4.6 |
| 2003 | 29.8°C | 27.2°C | 24.6°C | 31.6°C | 22.5°C | 293 mm | 85% | 2.3 m/s | 4.9 |
| 2002 | 30.2°C | 27.7°C | 25.1°C | 31.7°C | 24.0°C | 173 mm | 85% | 2.5 m/s | 5 |
| 2001 | 28.8°C | 26.4°C | 23.9°C | 30.8°C | 19.4°C | 311 mm | 84% | 2.4 m/s | 4.5 |
| 2000 | 30.4°C | 27.7°C | 25.0°C | 32.7°C | 22.2°C | 239 mm | 81% | 2.3 m/s | 5 |
| 1999 | 29.9°C | 27.2°C | 24.5°C | 32.8°C | 20.1°C | 217 mm | 82% | 2.9 m/s | 4.8 |
| 1998 | 29.9°C | 27.6°C | 25.4°C | 31.6°C | 23.1°C | 240 mm | 85% | 3.2 m/s | 4.4 |
| 1997 | 29.9°C | 27.2°C | 24.4°C | 31.6°C | 20.9°C | 177 mm | 80% | 2.5 m/s | 4.9 |
| 1996 | 30.7°C | 27.6°C | 24.6°C | 32.4°C | 22.0°C | 106 mm | 78% | 2.4 m/s | 5.3 |
| 1995 | 30.0°C | 27.4°C | 24.7°C | 31.3°C | 23.3°C | 179 mm | 84% | 2 m/s | 4.9 |
| 1994 | 28.7°C | 26.5°C | 24.3°C | 31.5°C | 22.2°C | 263 mm | 85% | 2.3 m/s | 4.5 |
| 1993 | 29.5°C | 26.9°C | 24.3°C | 31.2°C | 19.7°C | 171 mm | 84% | 2.3 m/s | 5.1 |
| 1992 | 29.2°C | 26.7°C | 24.3°C | 30.6°C | 21.5°C | 136 mm | 85% | 2.2 m/s | 4.8 |
| 1991 | 29.6°C | 26.9°C | 24.3°C | 31.1°C | 19.6°C | 145 mm | 84% | 2.2 m/s | 5.2 |
| 1990 | 30.0°C | 27.3°C | 24.6°C | 31.4°C | 20.8°C | 133 mm | 80% | 2.2 m/s | 5.3 |
| 1989 | 30.2°C | 27.4°C | 24.6°C | 31.7°C | 22.6°C | 171 mm | 82% | 2.3 m/s | 5.5 |
| 1988 | 30.4°C | 27.6°C | 24.7°C | 31.4°C | 22.0°C | 127 mm | 81% | 3.1 m/s | 5.1 |
| 1987 | 30.1°C | 27.4°C | 24.7°C | 32.1°C | 22.6°C | 162 mm | 79% | 1.7 m/s | 4.7 |
| 1986 | 30.0°C | 27.0°C | 24.1°C | 31.4°C | 22.8°C | 125 mm | 82% | 2.3 m/s | 5.4 |
| 1985 | 28.8°C | 26.2°C | 23.5°C | 30.7°C | 22.1°C | 166 mm | 84% | 3.1 m/s | 5.3 |
| 1984 ❄️ | 28.8°C | 26.0°C | 23.2°C | 30.7°C | 21.1°C | 189 mm | 83% | 3 m/s | 4.8 |
| 1983 | 28.7°C | 26.2°C | 23.7°C | 30.2°C | 18.4°C | 212 mm | 85% | 2.6 m/s | — |
| 1982 | 29.1°C | 26.6°C | 24.0°C | 30.9°C | 21.0°C | 215 mm | 83% | 2.2 m/s | — |
| 1981 | 29.5°C | 26.6°C | 23.6°C | 31.1°C | 18.3°C | 134 mm | 81% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30°C with lows near 24.6°C (mean 27.3°C), based on 45 years of NASA POWER data.
September averages 188 mm of rainfall in Fort Myers, a relatively wet time of year. The wettest on record was 372 mm in 2022.
The hottest September reached 33.3°C in 2020. The coldest dipped to 18.3°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 29°C to 30.8°C and overnight lows from 23.6°C to 25.3°C over the same span.
September is one of the warmer months of the year in Fort Myers and a relatively wet time of year, so plan for around 30°C daytime highs and 24.6°C at night.
Not quite — September is the 9th coolest month in Fort Myers, averaging 27.3°C.
For September in Fort Myers, pack light, breathable clothing and sun protection, with typical highs of 30°C and lows of 24.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 83% — quite humid.
Average wind speed in September is 2.4 m/s. The windiest September on record averaged 4.2 m/s (2004).
The wettest September on record was 2022 with 372 mm. On average, September sees 188 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 Fort Myers 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.
