September is one of the warmer months of the year in Gainesville, with average highs near 28.1°C and lows around 15.6°C (mean 21.9°C). It is one of the drier months, averaging 107 mm of rainfall and 72% 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 2019 — when the month averaged 26.3°C — while the coldest was 1994 at 19.3°C. Typical September days reach 28.1°C with nights near 15.6°C. The long-term trend is warming, about 0.5°C per decade.
September is one of the drier months in Gainesville, averaging 107 mm of rainfall. The wettest September on record was 2004 with 307 mm, while the driest was 1984 at 11 mm.
Relative humidity in Gainesville during September averages 72%. The most humid September was 1992 at 84%, and the least humid was 1999 at 53%.
September receives about 4.8 kWh/m²/day of solar energy in Gainesville. The sunniest September was 2019 at 5.7 kWh/m²/day, and the cloudiest were 1988 and 2009 at 3.9.
Average wind speed in Gainesville during September is 0.2 m/s. The windiest Septembers were 2021, 2023 and 2025, among others at 0.2 m/s, while the calmest were 2020, 2022 and 2024, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.0°C | 21.6°C | 21.6°C | 23.0°C | 22.1°C | +1.1°C |
| Avg High | 27.2°C | 28.0°C | 27.7°C | 29.4°C | 28.1°C | +0.9°C |
| Avg Low | 14.8°C | 15.2°C | 15.5°C | 16.6°C | 16.0°C | +1.2°C |
| Avg Rain | 105 mm | 100 mm | 132 mm | 82 mm | 123 mm | +18 mm |
September temperatures in Gainesville have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4°C (1983) to a record high of 38°C (2019).
Rainfall in September is one of the drier months, averaging 107 mm, with a wettest year of 307 mm.
One of the best times to visit Gainesville
September is one of the best times to visit Gainesville. Expect days averaging 28.1°C and nights around 15.6°C (mean 21.9°C) — warmer than Gainesville'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 | 29.2°C | 22.7°C | 16.2°C | 32.3°C | 10.9°C | 87 mm | 70% | 0.2 m/s | 5 |
| 2024 | 28.7°C | 23.1°C | 17.4°C | 35.3°C | 13.6°C | 234 mm | 72% | 0.1 m/s | 4.2 |
| 2023 | 29.3°C | 22.7°C | 16.0°C | 34.7°C | 11.9°C | 57 mm | 69% | 0.2 m/s | 5.2 |
| 2022 | 28.0°C | 21.5°C | 15.0°C | 34.8°C | 7.3°C | 103 mm | 70% | 0.1 m/s | 5.1 |
| 2021 | 27.0°C | 21.3°C | 15.6°C | 36.1°C | 8.2°C | 98 mm | 77% | 0.2 m/s | 4.9 |
| 2020 | 26.5°C | 21.1°C | 15.6°C | 32.6°C | 6.8°C | 160 mm | 79% | 0.1 m/s | 4.5 |
| 2019 🔥 | 34.1°C | 26.3°C | 18.6°C | 38.0°C | 13.4°C | 17 mm | 59% | 0.2 m/s | 5.7 |
| 2018 | 29.9°C | 24.6°C | 19.4°C | 33.0°C | 17.1°C | 77 mm | 79% | 0.1 m/s | 4.6 |
| 2017 | 27.5°C | 21.2°C | 14.8°C | 33.1°C | 9.1°C | 114 mm | 71% | 0.2 m/s | 5.2 |
| 2016 | 32.0°C | 24.9°C | 17.8°C | 35.6°C | 9.4°C | 35 mm | 65% | 0.2 m/s | 5.5 |
| 2015 | 28.0°C | 22.1°C | 16.2°C | 34.6°C | 8.5°C | 107 mm | 74% | 0.1 m/s | 4.6 |
| 2014 | 29.5°C | 23.4°C | 17.2°C | 35.4°C | 10.8°C | 72 mm | 74% | 0.1 m/s | 4.5 |
| 2013 | 26.4°C | 20.8°C | 15.2°C | 30.7°C | 9.4°C | 77 mm | 81% | 0.2 m/s | 5 |
| 2012 | 27.9°C | 21.7°C | 15.4°C | 34.1°C | 7.1°C | 93 mm | 73% | 0.2 m/s | 4.7 |
| 2011 | 27.9°C | 21.6°C | 15.4°C | 36.4°C | 10.2°C | 106 mm | 71% | 0.1 m/s | 4.6 |
| 2010 | 31.0°C | 23.7°C | 16.4°C | 35.6°C | 11.4°C | 125 mm | 64% | 0.2 m/s | 5.5 |
| 2009 | 26.4°C | 21.4°C | 16.4°C | 31.3°C | 6.5°C | 301 mm | 80% | 0.1 m/s | 3.9 |
| 2008 | 27.9°C | 21.8°C | 15.7°C | 33.1°C | 9.0°C | 21 mm | 74% | 0.1 m/s | 4.8 |
| 2007 | 30.8°C | 23.8°C | 16.7°C | 35.2°C | 9.1°C | 42 mm | 61% | 0.2 m/s | 5.1 |
| 2006 | 27.2°C | 20.8°C | 14.5°C | 32.0°C | 7.9°C | 117 mm | 74% | 0.2 m/s | 4.6 |
| 2005 | 29.1°C | 22.4°C | 15.8°C | 33.0°C | 12.4°C | 17 mm | 71% | 0.2 m/s | 5.5 |
| 2004 🌧️ | 25.5°C | 20.5°C | 15.5°C | 29.8°C | 9.0°C | 307 mm | 82% | 0.1 m/s | 4.5 |
| 2003 | 26.2°C | 20.3°C | 14.5°C | 30.4°C | 5.0°C | 95 mm | 76% | 0.2 m/s | 5.2 |
| 2002 | 29.1°C | 23.3°C | 17.4°C | 36.5°C | 14.0°C | 202 mm | 74% | 0.1 m/s | 4 |
| 2001 | 27.6°C | 20.5°C | 13.4°C | 32.1°C | 4.5°C | 87 mm | 68% | 0.1 m/s | 5 |
| 2000 | 27.2°C | 20.9°C | 14.6°C | 32.1°C | 5.1°C | 128 mm | 74% | 0.1 m/s | 4.3 |
| 1999 | 30.2°C | 22.0°C | 13.8°C | 36.4°C | 6.1°C | 66 mm | 53% | 0.2 m/s | 5.3 |
| 1998 | 31.5°C | 24.3°C | 17.0°C | 35.4°C | 9.7°C | 61 mm | 64% | 0.2 m/s | 4.9 |
| 1997 | 29.2°C | 22.5°C | 15.9°C | 34.6°C | 10.2°C | 162 mm | 66% | 0.2 m/s | 4.7 |
| 1996 | 26.9°C | 20.7°C | 14.4°C | 32.6°C | 8.3°C | 128 mm | 73% | 0.1 m/s | 4.4 |
| 1995 | 26.9°C | 20.8°C | 14.8°C | 32.2°C | 8.4°C | 68 mm | 77% | 0.1 m/s | 4.4 |
| 1994 ❄️ | 25.0°C | 19.3°C | 13.7°C | 29.4°C | 7.6°C | 95 mm | 80% | 0.2 m/s | 4.7 |
| 1993 | 29.9°C | 22.7°C | 15.4°C | 35.0°C | 4.8°C | 77 mm | 65% | 0.2 m/s | 4.8 |
| 1992 | 25.7°C | 20.8°C | 15.8°C | 30.9°C | 6.0°C | 139 mm | 84% | 0.1 m/s | 4.1 |
| 1991 | 26.5°C | 20.9°C | 15.3°C | 34.3°C | 5.8°C | 65 mm | 77% | 0.2 m/s | 4.9 |
| 1990 | 28.6°C | 22.1°C | 15.5°C | 36.8°C | 4.3°C | 144 mm | 70% | 0.2 m/s | 5.2 |
| 1989 | 25.3°C | 20.3°C | 15.4°C | 31.9°C | 7.9°C | 262 mm | 82% | 0.1 m/s | 4 |
| 1988 | 26.4°C | 21.0°C | 15.5°C | 33.0°C | 9.9°C | 148 mm | 81% | 0.1 m/s | 3.9 |
| 1987 | 28.5°C | 22.0°C | 15.5°C | 32.9°C | 9.7°C | 89 mm | 69% | 0.1 m/s | 4.5 |
| 1986 | 28.4°C | 22.6°C | 16.7°C | 33.4°C | 12.2°C | 90 mm | 77% | 0.1 m/s | 4 |
| 1985 | 27.4°C | 20.6°C | 13.8°C | 32.7°C | 5.9°C | 42 mm | 70% | 0.1 m/s | 5.1 |
| 1984 | 26.9°C | 20.0°C | 13.1°C | 33.0°C | 7.3°C | 11 mm | 68% | 0.2 m/s | 5.1 |
| 1983 | 25.9°C | 20.2°C | 14.5°C | 33.3°C | 4.0°C | 157 mm | 75% | 0.2 m/s | — |
| 1982 | 27.0°C | 20.6°C | 14.2°C | 32.4°C | 5.4°C | 62 mm | 71% | 0.2 m/s | — |
| 1981 | 29.2°C | 21.6°C | 14.1°C | 32.5°C | 7.2°C | 82 mm | 62% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.1°C with lows near 15.6°C (mean 21.9°C), based on 45 years of NASA POWER data.
September averages 107 mm of rainfall in Gainesville, one of the drier months. The wettest on record was 307 mm in 2004.
The hottest September reached 38°C in 2019. The coldest dipped to 4°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 27.3°C to 28.4°C and overnight lows from 13.9°C to 16°C over the same span.
September is one of the warmer months of the year in Gainesville and one of the drier months, so plan for around 28.1°C daytime highs and 15.6°C at night.
Not quite — September is the 9th coolest month in Gainesville, averaging 21.9°C.
For September in Gainesville, pack light layers you can adjust through the day, with typical highs of 28.1°C and lows of 15.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — 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 2004 with 307 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 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.
