September is one of the warmer months of the year in Winter Haven, with average highs near 29.9°C and lows around 22.5°C (mean 26.2°C). It is a relatively wet time of year, averaging 168 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Winter Haven. Across 45 years of records, the warmest September in Winter Haven was 2024 — when the month averaged 27.9°C — while the coldest was 2001 at 24.8°C. Typical September days reach 29.9°C with nights near 22.5°C. The long-term trend is warming, about 0.4°C per decade.
September is a relatively wet time of year in Winter Haven, averaging 168 mm of rainfall. The wettest September on record was 2022 with 364 mm, while the driest was 2019 at 57 mm.
Relative humidity in Winter Haven during September averages 85%. The most humid September was 2004 at 90%, and the least humid was 1996 at 77%.
September receives about 4.9 kWh/m²/day of solar energy in Winter Haven. The sunniest September was 2019 at 5.5 kWh/m²/day, and the cloudiest was 1998 at 4.1.
Average wind speed in Winter Haven during September is 1.9 m/s. The windiest September was 2004 at 3.5 m/s, while the calmest were 1987, 2015 and 2021 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.6°C | 26.1°C | 26.1°C | 26.5°C | 27.1°C | +1.5°C |
| Avg High | 29.3°C | 29.8°C | 29.7°C | 30.3°C | 30.9°C | +1.6°C |
| Avg Low | 21.9°C | 22.4°C | 22.5°C | 22.7°C | 23.2°C | +1.3°C |
| Avg Rain | 167 mm | 161 mm | 171 mm | 160 mm | 191 mm | +24 mm |
September temperatures in Winter Haven have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 13.2°C (1981) to a record high of 34.2°C (2005).
Rainfall in September is a relatively wet time of year, averaging 168 mm, with a wettest year of 364 mm.
A quieter season to visit Winter Haven
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Winter Haven. That said, September — with days averaging 29.9°C and nights around 22.5°C (mean 26.2°C) and higher rainfall (168 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 | 31.6°C | 27.2°C | 22.9°C | 33.6°C | 19.8°C | 94 mm | 80% | 1.8 m/s | 4.9 |
| 2024 🔥 | 31.5°C | 27.9°C | 24.2°C | 32.7°C | 22.2°C | 168 mm | 85% | 1.8 m/s | 4.6 |
| 2023 | 32.0°C | 27.6°C | 23.1°C | 34.2°C | 19.1°C | 170 mm | 78% | 1.5 m/s | 5.3 |
| 2022 🌧️ | 30.1°C | 26.4°C | 22.7°C | 33.2°C | 15.0°C | 364 mm | 87% | 1.8 m/s | 4.6 |
| 2021 | 30.1°C | 26.5°C | 22.8°C | 32.0°C | 19.1°C | 171 mm | 84% | 1.4 m/s | 5 |
| 2020 | 30.1°C | 26.7°C | 23.2°C | 33.7°C | 16.3°C | 179 mm | 86% | 2.1 m/s | 4.7 |
| 2019 | 31.2°C | 26.9°C | 22.5°C | 32.9°C | 19.3°C | 57 mm | 80% | 2.6 m/s | 5.5 |
| 2018 | 30.6°C | 27.0°C | 23.4°C | 32.6°C | 22.0°C | 109 mm | 87% | 1.6 m/s | 5.2 |
| 2017 | 29.9°C | 26.4°C | 22.9°C | 31.8°C | 20.5°C | 306 mm | 86% | 2.1 m/s | 4.9 |
| 2016 | 30.3°C | 26.7°C | 23.1°C | 31.8°C | 21.3°C | 175 mm | 86% | 1.7 m/s | 4.9 |
| 2015 | 29.7°C | 26.4°C | 23.0°C | 32.0°C | 19.8°C | 150 mm | 88% | 1.4 m/s | 4.7 |
| 2014 | 30.0°C | 26.3°C | 22.7°C | 33.8°C | 21.2°C | 266 mm | 84% | 1.5 m/s | 4.5 |
| 2013 | 29.8°C | 26.1°C | 22.3°C | 31.7°C | 19.5°C | 164 mm | 85% | 1.8 m/s | 5.1 |
| 2012 | 29.3°C | 25.5°C | 21.8°C | 31.4°C | 18.3°C | 131 mm | 86% | 1.7 m/s | 5 |
| 2011 | 30.5°C | 26.6°C | 22.6°C | 32.8°C | 20.5°C | 138 mm | 82% | 1.5 m/s | 5.3 |
| 2010 | 31.2°C | 26.9°C | 22.6°C | 33.5°C | 19.6°C | 103 mm | 79% | 2 m/s | 5.3 |
| 2009 | 29.8°C | 26.2°C | 22.6°C | 31.6°C | 16.5°C | 146 mm | 87% | 1.5 m/s | 5 |
| 2008 | 29.6°C | 25.9°C | 22.2°C | 31.7°C | 17.3°C | 64 mm | 86% | 2.3 m/s | 5.2 |
| 2007 | 30.3°C | 26.6°C | 22.9°C | 31.9°C | 20.7°C | 138 mm | 84% | 2 m/s | 4.8 |
| 2006 | 30.0°C | 25.8°C | 21.7°C | 31.5°C | 16.9°C | 149 mm | 83% | 1.5 m/s | 5.3 |
| 2005 | 31.4°C | 27.1°C | 22.8°C | 34.2°C | 20.3°C | 73 mm | 79% | 2.4 m/s | 5 |
| 2004 | 29.1°C | 26.2°C | 23.2°C | 31.0°C | 19.6°C | 347 mm | 90% | 3.5 m/s | 4.5 |
| 2003 | 28.9°C | 25.5°C | 22.1°C | 31.0°C | 18.7°C | 152 mm | 88% | 1.9 m/s | 4.8 |
| 2002 | 30.1°C | 26.7°C | 23.3°C | 31.6°C | 22.3°C | 149 mm | 89% | 2 m/s | 4.8 |
| 2001 ❄️ | 28.0°C | 24.8°C | 21.5°C | 30.6°C | 16.1°C | 322 mm | 88% | 1.8 m/s | 4.4 |
| 2000 | 30.2°C | 26.4°C | 22.7°C | 32.4°C | 19.7°C | 166 mm | 84% | 2.1 m/s | 4.7 |
| 1999 | 29.8°C | 26.0°C | 22.1°C | 33.1°C | 17.8°C | 148 mm | 84% | 2.2 m/s | 4.8 |
| 1998 | 29.7°C | 26.5°C | 23.3°C | 33.6°C | 19.5°C | 263 mm | 87% | 2.4 m/s | 4.1 |
| 1997 | 30.3°C | 26.1°C | 22.0°C | 32.7°C | 18.7°C | 170 mm | 82% | 2 m/s | 5.2 |
| 1996 | 31.4°C | 26.9°C | 22.3°C | 33.6°C | 17.9°C | 114 mm | 77% | 1.8 m/s | 5.1 |
| 1995 | 29.8°C | 26.2°C | 22.6°C | 30.8°C | 19.9°C | 142 mm | 87% | 1.5 m/s | 5.2 |
| 1994 | 28.3°C | 25.2°C | 22.1°C | 31.2°C | 19.2°C | 281 mm | 89% | 1.8 m/s | 4.5 |
| 1993 | 29.5°C | 26.0°C | 22.5°C | 31.9°C | 17.0°C | 149 mm | 85% | 1.6 m/s | 4.9 |
| 1992 | 28.9°C | 25.6°C | 22.4°C | 31.4°C | 19.2°C | 156 mm | 89% | 1.7 m/s | 4.7 |
| 1991 | 29.6°C | 25.8°C | 22.1°C | 31.2°C | 14.4°C | 95 mm | 87% | 2.1 m/s | 5.3 |
| 1990 | 30.7°C | 26.5°C | 22.4°C | 33.0°C | 17.0°C | 97 mm | 80% | 1.8 m/s | 5.1 |
| 1989 | 30.0°C | 26.3°C | 22.6°C | 31.7°C | 20.0°C | 190 mm | 86% | 1.8 m/s | 5.1 |
| 1988 | 29.6°C | 26.1°C | 22.7°C | 31.4°C | 18.3°C | 225 mm | 88% | 2.2 m/s | 4.7 |
| 1987 | 30.4°C | 26.5°C | 22.6°C | 33.1°C | 20.0°C | 169 mm | 80% | 1.4 m/s | 4.5 |
| 1986 | 29.9°C | 25.9°C | 22.0°C | 31.2°C | 20.1°C | 104 mm | 85% | 1.6 m/s | 5.2 |
| 1985 | 28.5°C | 25.0°C | 21.6°C | 30.4°C | 19.3°C | 155 mm | 87% | 2.3 m/s | 4.9 |
| 1984 | 29.4°C | 25.3°C | 21.3°C | 32.0°C | 18.6°C | 112 mm | 81% | 2.7 m/s | 4.9 |
| 1983 | 28.3°C | 24.9°C | 21.6°C | 30.8°C | 15.8°C | 167 mm | 87% | 1.9 m/s | — |
| 1982 | 28.8°C | 25.3°C | 21.7°C | 32.5°C | 16.4°C | 240 mm | 87% | 1.8 m/s | — |
| 1981 | 29.0°C | 25.0°C | 21.0°C | 31.1°C | 13.2°C | 141 mm | 85% | 1.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.9°C with lows near 22.5°C (mean 26.2°C), based on 45 years of NASA POWER data.
September averages 168 mm of rainfall in Winter Haven, a relatively wet time of year. The wettest on record was 364 mm in 2022.
The hottest September reached 34.2°C in 2005. The coldest dipped to 13.2°C in 1981.
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 28.8°C to 31.1°C and overnight lows from 21.4°C to 23.1°C over the same span.
September is one of the warmer months of the year in Winter Haven and a relatively wet time of year, so plan for around 29.9°C daytime highs and 22.5°C at night.
Not quite — September is the 9th coolest month in Winter Haven, averaging 26.2°C.
For September in Winter Haven, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 22.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 3.5 m/s (2004).
The wettest September on record was 2022 with 364 mm. On average, September sees 168 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 Winter Haven 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.
