September is one of the warmer months of the year in Kissimmee, with average highs near 30°C and lows around 22.8°C (mean 26.4°C). It is a relatively wet time of year, averaging 173 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Kissimmee. Across 45 years of records, the warmest September in Kissimmee was 2024 — when the month averaged 27.8°C — while the coldest was 2001 at 24.9°C. Typical September days reach 30°C with nights near 22.8°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Kissimmee, averaging 173 mm of rainfall. The wettest September on record was 2004 with 406 mm, while the driest was 2019 at 74 mm.
Relative humidity in Kissimmee during September averages 84%. The most humid September was 1994 at 88%, and the least humid was 2010 at 75%.
September receives about 4.9 kWh/m²/day of solar energy in Kissimmee. The sunniest September was 2019 at 5.5 kWh/m²/day, and the cloudiest was 1998 at 4.1.
Average wind speed in Kissimmee during September is 2 m/s. The windiest September was 2004 at 4 m/s, while the calmest were 1987, 2015 and 2021 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.9°C | 26.3°C | 26.3°C | 26.8°C | 27.1°C | +1.2°C |
| Avg High | 29.4°C | 29.8°C | 29.7°C | 30.5°C | 30.8°C | +1.4°C |
| Avg Low | 22.4°C | 22.8°C | 22.8°C | 23.0°C | 23.4°C | +1°C |
| Avg Rain | 157 mm | 163 mm | 183 mm | 161 mm | 213 mm | +56 mm |
September temperatures in Kissimmee have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 13.4°C (1981) to a record high of 35.1°C (2023).
Rainfall in September is a relatively wet time of year, averaging 173 mm, with a wettest year of 406 mm.
A quieter season to visit Kissimmee
If your dates are flexible, the more temperate months of April and November tend to be the most comfortable for visiting Kissimmee. That said, September — with days averaging 30°C and nights around 22.8°C (mean 26.4°C) and higher rainfall (173 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 | 30.7°C | 26.9°C | 23.2°C | 33.3°C | 19.6°C | 134 mm | 83% | 1.9 m/s | 4.9 |
| 2024 🔥 | 31.3°C | 27.8°C | 24.3°C | 32.7°C | 22.1°C | 193 mm | 85% | 1.9 m/s | 4.6 |
| 2023 | 31.9°C | 27.7°C | 23.5°C | 35.1°C | 18.6°C | 188 mm | 77% | 1.6 m/s | 5.3 |
| 2022 | 30.4°C | 26.7°C | 23.1°C | 33.2°C | 15.4°C | 399 mm | 85% | 1.8 m/s | 4.6 |
| 2021 | 30.2°C | 26.5°C | 22.9°C | 32.3°C | 19.7°C | 151 mm | 84% | 1.5 m/s | 5 |
| 2020 | 30.0°C | 26.8°C | 23.6°C | 33.6°C | 16.4°C | 212 mm | 87% | 2.2 m/s | 4.7 |
| 2019 | 31.3°C | 27.2°C | 23.0°C | 33.4°C | 19.4°C | 74 mm | 77% | 3.1 m/s | 5.5 |
| 2018 | 30.7°C | 27.2°C | 23.8°C | 32.6°C | 23.0°C | 76 mm | 85% | 1.7 m/s | 5.2 |
| 2017 | 29.9°C | 26.6°C | 23.3°C | 32.3°C | 20.6°C | 350 mm | 86% | 2.3 m/s | 4.9 |
| 2016 | 30.3°C | 26.8°C | 23.3°C | 31.7°C | 20.6°C | 183 mm | 85% | 1.8 m/s | 4.9 |
| 2015 | 29.8°C | 26.5°C | 23.1°C | 32.4°C | 19.5°C | 164 mm | 87% | 1.5 m/s | 4.7 |
| 2014 | 29.9°C | 26.4°C | 22.9°C | 33.7°C | 20.8°C | 265 mm | 84% | 1.6 m/s | 4.5 |
| 2013 | 30.3°C | 26.5°C | 22.6°C | 32.8°C | 20.2°C | 127 mm | 81% | 1.9 m/s | 5.1 |
| 2012 | 29.7°C | 26.0°C | 22.2°C | 32.0°C | 19.5°C | 131 mm | 83% | 1.8 m/s | 5 |
| 2011 | 31.1°C | 27.0°C | 22.9°C | 33.6°C | 20.6°C | 117 mm | 80% | 1.7 m/s | 5.3 |
| 2010 | 31.8°C | 27.5°C | 23.2°C | 34.7°C | 19.9°C | 125 mm | 75% | 2.2 m/s | 5.3 |
| 2009 | 29.7°C | 26.3°C | 22.8°C | 31.2°C | 15.7°C | 126 mm | 85% | 1.7 m/s | 5 |
| 2008 | 29.3°C | 25.9°C | 22.5°C | 31.8°C | 16.7°C | 83 mm | 86% | 2.4 m/s | 5.2 |
| 2007 | 30.3°C | 26.8°C | 23.3°C | 32.5°C | 20.7°C | 202 mm | 82% | 2.1 m/s | 4.8 |
| 2006 | 30.6°C | 26.3°C | 22.1°C | 32.8°C | 17.2°C | 121 mm | 80% | 1.6 m/s | 5.3 |
| 2005 | 30.8°C | 26.9°C | 23.1°C | 33.1°C | 19.9°C | 117 mm | 81% | 2.6 m/s | 5 |
| 2004 🌧️ | 29.0°C | 26.3°C | 23.5°C | 31.0°C | 20.5°C | 406 mm | 88% | 4 m/s | 4.5 |
| 2003 | 29.1°C | 25.7°C | 22.2°C | 30.9°C | 18.9°C | 125 mm | 87% | 2.1 m/s | 4.8 |
| 2002 | 30.1°C | 26.8°C | 23.5°C | 31.9°C | 21.9°C | 136 mm | 88% | 2 m/s | 4.8 |
| 2001 ❄️ | 28.1°C | 24.9°C | 21.8°C | 30.7°C | 15.5°C | 338 mm | 88% | 2 m/s | 4.4 |
| 2000 | 30.2°C | 26.7°C | 23.1°C | 33.7°C | 20.9°C | 178 mm | 83% | 2.3 m/s | 4.7 |
| 1999 | 30.1°C | 26.2°C | 22.3°C | 34.8°C | 18.5°C | 220 mm | 82% | 2.4 m/s | 4.8 |
| 1998 | 29.7°C | 26.6°C | 23.6°C | 34.5°C | 19.9°C | 219 mm | 86% | 2.5 m/s | 4.1 |
| 1997 | 29.7°C | 26.0°C | 22.3°C | 31.5°C | 19.2°C | 115 mm | 83% | 2.1 m/s | 5.2 |
| 1996 | 30.6°C | 26.6°C | 22.5°C | 32.5°C | 19.1°C | 127 mm | 80% | 1.9 m/s | 5.1 |
| 1995 | 29.7°C | 26.3°C | 23.0°C | 31.1°C | 19.5°C | 159 mm | 87% | 1.6 m/s | 5.2 |
| 1994 | 28.4°C | 25.4°C | 22.3°C | 31.4°C | 19.5°C | 237 mm | 88% | 1.8 m/s | 4.5 |
| 1993 | 30.2°C | 26.6°C | 23.1°C | 33.5°C | 18.1°C | 131 mm | 82% | 1.7 m/s | 4.9 |
| 1992 | 28.9°C | 25.9°C | 23.0°C | 31.2°C | 20.3°C | 173 mm | 88% | 1.9 m/s | 4.7 |
| 1991 | 29.6°C | 26.1°C | 22.6°C | 31.5°C | 15.1°C | 140 mm | 85% | 2.2 m/s | 5.3 |
| 1990 | 31.3°C | 27.1°C | 22.9°C | 34.3°C | 18.3°C | 107 mm | 76% | 2.1 m/s | 5.1 |
| 1989 | 30.4°C | 26.8°C | 23.3°C | 32.7°C | 20.7°C | 162 mm | 83% | 2 m/s | 5.1 |
| 1988 | 29.7°C | 26.3°C | 23.0°C | 31.5°C | 20.3°C | 146 mm | 86% | 2.4 m/s | 4.7 |
| 1987 | 30.3°C | 26.5°C | 22.8°C | 34.9°C | 19.4°C | 202 mm | 80% | 1.5 m/s | 4.5 |
| 1986 | 30.3°C | 26.5°C | 22.6°C | 32.6°C | 21.4°C | 86 mm | 81% | 1.7 m/s | 5.2 |
| 1985 | 28.4°C | 25.3°C | 22.1°C | 31.4°C | 20.3°C | 201 mm | 86% | 2.5 m/s | 4.9 |
| 1984 | 29.1°C | 25.4°C | 21.7°C | 32.0°C | 17.9°C | 149 mm | 80% | 2.9 m/s | 4.9 |
| 1983 | 28.7°C | 25.5°C | 22.2°C | 31.5°C | 16.6°C | 128 mm | 84% | 2 m/s | — |
| 1982 | 28.8°C | 25.4°C | 22.1°C | 33.1°C | 17.2°C | 209 mm | 87% | 1.8 m/s | — |
| 1981 | 29.1°C | 25.3°C | 21.5°C | 31.4°C | 13.4°C | 136 mm | 82% | 1.8 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 22.8°C (mean 26.4°C), based on 45 years of NASA POWER data.
September averages 173 mm of rainfall in Kissimmee, a relatively wet time of year. The wettest on record was 406 mm in 2004.
The hottest September reached 35.1°C in 2023. The coldest dipped to 13.4°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 28.8°C to 30.9°C and overnight lows from 21.9°C to 23.4°C over the same span.
September is one of the warmer months of the year in Kissimmee and a relatively wet time of year, so plan for around 30°C daytime highs and 22.8°C at night.
Not quite — September is the 9th coolest month in Kissimmee, averaging 26.4°C.
For September in Kissimmee, pack light, breathable clothing and sun protection, with typical highs of 30°C and lows of 22.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 4 m/s (2004).
The wettest September on record was 2004 with 406 mm. On average, September sees 173 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 Kissimmee 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.
