September is one of the warmer months of the year in Gainesville, with average highs near 30.2°C and lows around 21.7°C (mean 26°C). It is a relatively wet time of year, averaging 145 mm of rainfall and 83% relative humidity across the period.
September is one of the warmer months of the year in Gainesville. Across 45 years of records, the warmest September in Gainesville was 2018 — when the month averaged 27.6°C — while the coldest was 2001 at 24.1°C. Typical September days reach 30.2°C with nights near 21.7°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Gainesville, averaging 145 mm of rainfall. The wettest September on record was 2004 with 404 mm, while the driest was 2019 at 47 mm.
Relative humidity in Gainesville during September averages 83%. The most humid September was 1998 at 89%, and the least humid was 1997 at 73%.
September receives about 4.9 kWh/m²/day of solar energy in Gainesville. The sunniest September was 2019 at 5.7 kWh/m²/day, and the cloudiest was 1998 at 4.
Average wind speed in Gainesville during September is 1 m/s. The windiest September was 2004 at 1.8 m/s, while the calmest was 2021 at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.4°C | 25.9°C | 25.8°C | 26.3°C | 26.6°C | +1.2°C |
| Avg High | 29.6°C | 30.3°C | 29.9°C | 30.7°C | 31.0°C | +1.4°C |
| Avg Low | 21.1°C | 21.6°C | 21.7°C | 21.9°C | 22.2°C | +1.1°C |
| Avg Rain | 163 mm | 132 mm | 156 mm | 144 mm | 124 mm | -39 mm |
September temperatures in Gainesville have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 10.8°C (1981) to a record high of 36.6°C (1997).
Rainfall in September is a relatively wet time of year, averaging 145 mm, with a wettest year of 404 mm.
A good time to visit Gainesville
September is a good time to visit Gainesville, with days averaging 30.2°C and nights around 21.7°C (mean 26°C, warmer than Gainesville's yearly average) and higher rainfall. October and April 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 | 31.6°C | 26.4°C | 21.3°C | 35.1°C | 16.4°C | 88 mm | 79% | 1 m/s | 5.3 |
| 2024 | 30.9°C | 27.1°C | 23.2°C | 34.3°C | 19.8°C | 162 mm | 86% | 1 m/s | 4.3 |
| 2023 | 32.5°C | 27.3°C | 22.0°C | 35.1°C | 16.7°C | 86 mm | 76% | 0.9 m/s | 5.2 |
| 2022 | 30.0°C | 25.9°C | 21.8°C | 34.5°C | 14.8°C | 135 mm | 85% | 1 m/s | 4.5 |
| 2021 | 30.3°C | 26.2°C | 22.1°C | 32.5°C | 17.2°C | 129 mm | 84% | 0.7 m/s | 4.8 |
| 2020 | 30.4°C | 26.4°C | 22.5°C | 35.7°C | 12.7°C | 142 mm | 84% | 1.1 m/s | 4.5 |
| 2019 | 32.0°C | 27.1°C | 22.2°C | 34.6°C | 18.3°C | 47 mm | 80% | 1.1 m/s | 5.7 |
| 2018 🔥 | 31.9°C | 27.6°C | 23.3°C | 33.6°C | 22.1°C | 77 mm | 83% | 0.8 m/s | 5.6 |
| 2017 | 29.9°C | 26.0°C | 22.0°C | 33.1°C | 19.5°C | 306 mm | 85% | 1 m/s | 4.9 |
| 2016 | 30.8°C | 26.4°C | 22.1°C | 33.4°C | 18.1°C | 188 mm | 84% | 0.9 m/s | 5.2 |
| 2015 | 29.3°C | 25.6°C | 21.9°C | 33.3°C | 14.3°C | 165 mm | 88% | 0.9 m/s | 4.3 |
| 2014 | 30.0°C | 26.0°C | 22.1°C | 35.6°C | 16.9°C | 236 mm | 85% | 0.8 m/s | 4.3 |
| 2013 | 30.2°C | 25.9°C | 21.6°C | 33.3°C | 17.7°C | 127 mm | 84% | 0.9 m/s | 5.1 |
| 2012 | 29.8°C | 25.4°C | 21.0°C | 33.1°C | 13.6°C | 99 mm | 85% | 0.9 m/s | 5.2 |
| 2011 | 31.4°C | 26.4°C | 21.4°C | 34.1°C | 17.6°C | 107 mm | 78% | 0.9 m/s | 5.1 |
| 2010 | 31.8°C | 26.7°C | 21.7°C | 34.9°C | 17.9°C | 91 mm | 78% | 0.9 m/s | 5.4 |
| 2009 | 29.6°C | 25.5°C | 21.5°C | 32.4°C | 13.4°C | 107 mm | 86% | 0.9 m/s | 5 |
| 2008 | 29.7°C | 25.4°C | 21.1°C | 33.8°C | 13.4°C | 57 mm | 85% | 1.1 m/s | 5.3 |
| 2007 | 30.9°C | 26.6°C | 22.3°C | 34.1°C | 19.1°C | 133 mm | 82% | 1.1 m/s | 5 |
| 2006 | 31.4°C | 26.3°C | 21.2°C | 34.6°C | 15.6°C | 98 mm | 76% | 0.8 m/s | 5.1 |
| 2005 | 31.4°C | 26.7°C | 22.0°C | 34.2°C | 18.2°C | 67 mm | 80% | 1.2 m/s | 5.2 |
| 2004 🌧️ | 28.9°C | 25.7°C | 22.6°C | 31.5°C | 17.9°C | 404 mm | 89% | 1.8 m/s | 4.4 |
| 2003 | 29.1°C | 25.0°C | 20.9°C | 31.6°C | 16.0°C | 90 mm | 86% | 1 m/s | 4.7 |
| 2002 | 30.6°C | 26.8°C | 22.9°C | 32.9°C | 21.2°C | 143 mm | 86% | 1.1 m/s | 5 |
| 2001 ❄️ | 28.0°C | 24.1°C | 20.3°C | 31.4°C | 13.0°C | 226 mm | 86% | 1 m/s | 4.5 |
| 2000 | 29.1°C | 25.5°C | 21.8°C | 32.5°C | 16.8°C | 232 mm | 88% | 1.1 m/s | 4.2 |
| 1999 | 30.1°C | 25.5°C | 20.9°C | 34.1°C | 14.0°C | 155 mm | 80% | 1.1 m/s | 5.1 |
| 1998 | 28.8°C | 25.6°C | 22.5°C | 33.3°C | 18.0°C | 343 mm | 89% | 1.2 m/s | 4 |
| 1997 | 32.3°C | 27.1°C | 22.0°C | 36.6°C | 18.6°C | 88 mm | 73% | 0.9 m/s | 5.3 |
| 1996 | 30.2°C | 25.7°C | 21.1°C | 32.4°C | 14.3°C | 110 mm | 82% | 0.9 m/s | 5.1 |
| 1995 | 30.6°C | 26.3°C | 22.0°C | 32.9°C | 18.6°C | 103 mm | 83% | 0.9 m/s | 4.9 |
| 1994 | 28.7°C | 24.8°C | 20.9°C | 33.3°C | 17.7°C | 150 mm | 87% | 0.9 m/s | 4.7 |
| 1993 | 30.6°C | 26.3°C | 22.0°C | 33.3°C | 13.9°C | 116 mm | 81% | 0.9 m/s | 5.1 |
| 1992 | 29.5°C | 25.7°C | 22.0°C | 32.4°C | 16.8°C | 104 mm | 86% | 1 m/s | 4.7 |
| 1991 | 30.2°C | 25.6°C | 21.1°C | 33.2°C | 13.1°C | 87 mm | 84% | 1 m/s | 5.4 |
| 1990 | 31.9°C | 26.7°C | 21.5°C | 35.8°C | 14.3°C | 68 mm | 76% | 0.9 m/s | 5.3 |
| 1989 | 30.1°C | 26.1°C | 22.1°C | 33.1°C | 18.7°C | 191 mm | 85% | 0.9 m/s | 4.8 |
| 1988 | 29.7°C | 26.1°C | 22.5°C | 32.3°C | 19.1°C | 336 mm | 87% | 1 m/s | 4.4 |
| 1987 | 30.6°C | 26.1°C | 21.6°C | 32.8°C | 16.5°C | 131 mm | 79% | 0.8 m/s | 4.5 |
| 1986 | 30.3°C | 26.0°C | 21.7°C | 32.3°C | 19.7°C | 96 mm | 84% | 0.8 m/s | 5.4 |
| 1985 | 28.8°C | 24.7°C | 20.7°C | 32.0°C | 15.0°C | 137 mm | 86% | 1.1 m/s | 5 |
| 1984 | 30.2°C | 25.4°C | 20.6°C | 34.6°C | 15.9°C | 125 mm | 78% | 1.3 m/s | 4.9 |
| 1983 | 28.3°C | 24.3°C | 20.4°C | 31.7°C | 12.6°C | 196 mm | 85% | 0.9 m/s | — |
| 1982 | 28.8°C | 24.8°C | 20.7°C | 33.6°C | 13.4°C | 165 mm | 86% | 0.9 m/s | — |
| 1981 | 30.0°C | 25.0°C | 19.9°C | 33.2°C | 10.8°C | 90 mm | 79% | 0.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.2°C with lows near 21.7°C (mean 26°C), based on 45 years of NASA POWER data.
September averages 145 mm of rainfall in Gainesville, a relatively wet time of year. The wettest on record was 404 mm in 2004.
The hottest September reached 36.6°C in 1997. The coldest dipped to 10.8°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 29.2°C to 31.1°C and overnight lows from 20.5°C to 22.1°C over the same span.
September is one of the warmer months of the year in Gainesville and a relatively wet time of year, so plan for around 30.2°C daytime highs and 21.7°C at night.
Not quite — September is the 9th coolest month in Gainesville, averaging 26°C.
For September in Gainesville, pack light, breathable clothing and sun protection, with typical highs of 30.2°C and lows of 21.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 83% — quite humid.
Average wind speed in September is 1 m/s. The windiest September on record averaged 1.8 m/s (2004).
The wettest September on record was 2004 with 404 mm. On average, September sees 145 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 Gainesville 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.
