September is one of the warmer months of the year in West Palm Beach, with average highs near 29.4°C and lows around 26.1°C (mean 27.8°C). It is a relatively wet time of year, averaging 197 mm of rainfall and 81% relative humidity across the period.
September is one of the warmer months of the year in West Palm Beach. Across 45 years of records, the warmest September in West Palm Beach was 2024 — when the month averaged 29.1°C — while the coldest was 1984 at 26.6°C. Typical September days reach 29.4°C with nights near 26.1°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in West Palm Beach, averaging 197 mm of rainfall. The wettest September on record was 2024 with 341 mm, while the driest was 1988 at 52 mm.
Relative humidity in West Palm Beach during September averages 81%. The most humid September was 2004 at 83%, and the least humid were 2006 and 2023 at 78%.
September receives about 4.8 kWh/m²/day of solar energy in West Palm Beach. The sunniest September was 2019 at 5.5 kWh/m²/day, and the cloudiest was 1994 at 4.2.
Average wind speed in West Palm Beach during September is 2.9 m/s. The windiest September was 2004 at 5.4 m/s, while the calmest were 1987 and 2015 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.4°C | 27.6°C | 27.8°C | 28.0°C | 28.4°C | +1°C |
| Avg High | 29.0°C | 29.1°C | 29.4°C | 29.6°C | 30.1°C | +1.1°C |
| Avg Low | 25.8°C | 26.0°C | 26.1°C | 26.3°C | 26.7°C | +0.9°C |
| Avg Rain | 180 mm | 205 mm | 196 mm | 171 mm | 255 mm | +75 mm |
September temperatures in West Palm Beach have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 20.4°C (2022) to a record high of 32.3°C (2025).
Rainfall in September is a relatively wet time of year, averaging 197 mm, with a wettest year of 341 mm.
A quieter season to visit West Palm Beach
If your dates are flexible, the more temperate months of December and February tend to be the most comfortable for visiting West Palm Beach. That said, September — with days averaging 29.4°C and nights around 26.1°C (mean 27.8°C) and higher rainfall (197 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 | 29.9°C | 28.2°C | 26.6°C | 32.3°C | 24.8°C | 306 mm | 83% | 2.5 m/s | 4.7 |
| 2024 🔥 🌧️ | 30.7°C | 29.1°C | 27.5°C | 32.2°C | 26.5°C | 341 mm | 83% | 2.8 m/s | 4.8 |
| 2023 | 30.4°C | 28.7°C | 26.9°C | 31.6°C | 25.8°C | 232 mm | 78% | 2.4 m/s | 5.2 |
| 2022 | 30.2°C | 28.4°C | 26.6°C | 32.2°C | 20.4°C | 284 mm | 81% | 2.6 m/s | 5 |
| 2021 | 29.9°C | 27.9°C | 25.9°C | 31.3°C | 24.5°C | 172 mm | 79% | 2.2 m/s | 5.2 |
| 2020 | 29.7°C | 28.1°C | 26.5°C | 31.3°C | 25.3°C | 192 mm | 82% | 3 m/s | 4.9 |
| 2019 | 29.9°C | 28.0°C | 26.1°C | 31.9°C | 24.4°C | 73 mm | 80% | 4.9 m/s | 5.5 |
| 2018 | 29.7°C | 28.1°C | 26.5°C | 31.0°C | 24.8°C | 130 mm | 81% | 2.8 m/s | 5.1 |
| 2017 | 30.0°C | 28.2°C | 26.5°C | 31.0°C | 24.6°C | 223 mm | 81% | 3.4 m/s | 4.9 |
| 2016 | 29.6°C | 28.0°C | 26.5°C | 31.0°C | 24.8°C | 248 mm | 82% | 2.2 m/s | 4.7 |
| 2015 | 30.0°C | 28.3°C | 26.7°C | 31.1°C | 25.0°C | 222 mm | 81% | 2 m/s | 4.4 |
| 2014 | 29.3°C | 27.7°C | 26.1°C | 31.0°C | 25.0°C | 170 mm | 80% | 2.3 m/s | 4.5 |
| 2013 | 29.2°C | 27.5°C | 25.9°C | 30.6°C | 24.7°C | 141 mm | 81% | 2.6 m/s | 4.4 |
| 2012 | 29.0°C | 27.4°C | 25.9°C | 31.7°C | 25.0°C | 145 mm | 80% | 2.8 m/s | 4.9 |
| 2011 | 29.9°C | 28.2°C | 26.4°C | 31.3°C | 25.5°C | 151 mm | 79% | 2.5 m/s | 5.1 |
| 2010 | 29.8°C | 28.1°C | 26.4°C | 31.5°C | 24.5°C | 206 mm | 81% | 3.5 m/s | 4.9 |
| 2009 | 29.5°C | 27.9°C | 26.4°C | 30.3°C | 24.9°C | 191 mm | 81% | 2.2 m/s | 4.8 |
| 2008 | 29.1°C | 27.5°C | 25.9°C | 30.2°C | 23.5°C | 157 mm | 82% | 3.5 m/s | 4.8 |
| 2007 | 29.4°C | 27.9°C | 26.3°C | 31.7°C | 24.0°C | 206 mm | 80% | 2.8 m/s | 4.8 |
| 2006 | 29.7°C | 27.7°C | 25.8°C | 31.0°C | 24.5°C | 156 mm | 78% | 2.6 m/s | 5.1 |
| 2005 | 29.7°C | 27.8°C | 25.9°C | 31.1°C | 24.4°C | 162 mm | 82% | 3.1 m/s | 4.9 |
| 2004 | 29.1°C | 27.8°C | 26.4°C | 30.8°C | 25.2°C | 304 mm | 83% | 5.4 m/s | 4.5 |
| 2003 | 29.5°C | 27.8°C | 26.0°C | 30.7°C | 24.8°C | 174 mm | 83% | 2.8 m/s | 4.8 |
| 2002 | 29.6°C | 28.0°C | 26.4°C | 30.4°C | 25.5°C | 123 mm | 82% | 2.9 m/s | 4.8 |
| 2001 | 28.8°C | 27.1°C | 25.5°C | 31.1°C | 21.8°C | 336 mm | 82% | 2.9 m/s | 4.4 |
| 2000 | 30.0°C | 28.2°C | 26.4°C | 31.3°C | 25.3°C | 155 mm | 79% | 2.7 m/s | 4.9 |
| 1999 | 29.3°C | 27.6°C | 25.9°C | 31.7°C | 24.0°C | 213 mm | 81% | 3.4 m/s | 4.6 |
| 1998 | 29.5°C | 28.0°C | 26.5°C | 31.9°C | 24.9°C | 320 mm | 82% | 3.5 m/s | 4.5 |
| 1997 | 28.7°C | 27.2°C | 25.7°C | 29.8°C | 24.0°C | 217 mm | 83% | 3 m/s | 4.6 |
| 1996 | 29.4°C | 27.6°C | 25.7°C | 30.7°C | 24.0°C | 135 mm | 81% | 2.8 m/s | 5.2 |
| 1995 | 29.5°C | 27.9°C | 26.3°C | 30.7°C | 25.4°C | 178 mm | 80% | 2.5 m/s | 4.7 |
| 1994 | 28.3°C | 27.0°C | 25.7°C | 30.0°C | 24.6°C | 269 mm | 83% | 2.8 m/s | 4.2 |
| 1993 | 29.2°C | 27.6°C | 26.1°C | 30.4°C | 24.1°C | 164 mm | 81% | 2.9 m/s | 4.6 |
| 1992 | 28.8°C | 27.3°C | 25.8°C | 29.9°C | 24.4°C | 195 mm | 82% | 3 m/s | 4.6 |
| 1991 | 29.1°C | 27.6°C | 26.1°C | 30.2°C | 23.7°C | 171 mm | 80% | 2.6 m/s | 4.9 |
| 1990 | 29.4°C | 27.8°C | 26.1°C | 30.7°C | 24.3°C | 190 mm | 79% | 2.5 m/s | 5 |
| 1989 | 29.8°C | 28.0°C | 26.2°C | 31.1°C | 24.7°C | 137 mm | 79% | 2.9 m/s | 5.3 |
| 1988 | 29.4°C | 27.8°C | 26.1°C | 30.1°C | 24.3°C | 52 mm | 79% | 3.6 m/s | 5.2 |
| 1987 | 29.8°C | 28.0°C | 26.3°C | 31.7°C | 24.9°C | 215 mm | 79% | 2 m/s | 4.5 |
| 1986 | 29.3°C | 27.6°C | 25.8°C | 30.6°C | 25.2°C | 113 mm | 79% | 2.8 m/s | 5.2 |
| 1985 | 28.1°C | 26.8°C | 25.4°C | 29.2°C | 24.4°C | 253 mm | 82% | 3.7 m/s | 4.8 |
| 1984 ❄️ | 28.3°C | 26.6°C | 24.9°C | 29.6°C | 22.8°C | 262 mm | 81% | 3.8 m/s | 4.7 |
| 1983 | 28.7°C | 27.3°C | 25.8°C | 30.4°C | 23.0°C | 206 mm | 82% | 3.1 m/s | — |
| 1982 | 28.8°C | 27.2°C | 25.6°C | 30.1°C | 24.1°C | 193 mm | 79% | 2.6 m/s | — |
| 1981 | 28.8°C | 27.2°C | 25.7°C | 30.6°C | 24.2°C | 190 mm | 80% | 2.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.4°C with lows near 26.1°C (mean 27.8°C), based on 45 years of NASA POWER data.
September averages 197 mm of rainfall in West Palm Beach, a relatively wet time of year. The wettest on record was 341 mm in 2024.
The hottest September reached 32.3°C in 2025. The coldest dipped to 20.4°C in 2022.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 28.5°C to 30.2°C and overnight lows from 25.5°C to 26.7°C over the same span.
September is one of the warmer months of the year in West Palm Beach and a relatively wet time of year, so plan for around 29.4°C daytime highs and 26.1°C at night.
Not quite — September is the 10th coolest month in West Palm Beach, averaging 27.8°C.
For September in West Palm Beach, pack light layers you can adjust through the day, with typical highs of 29.4°C and lows of 26.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 5.4 m/s (2004).
The wettest September on record was 2024 with 341 mm. On average, September sees 197 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 West Palm Beach 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.
