September is one of the warmer months of the year in Palm Desert, with average highs near 35.8°C and lows around 20.6°C (mean 28.2°C). It is about average for rainfall, averaging 10 mm of rainfall and 32% relative humidity across the period.
September is one of the warmer months of the year in Palm Desert. Across 45 years of records, the warmest September in Palm Desert was 2020 — when the month averaged 31.2°C — while the coldest was 1986 at 23.6°C. Typical September days reach 35.8°C with nights near 20.6°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Palm Desert, averaging 10 mm of rainfall. The wettest September on record was 1997 with 62 mm, while the driest were 1992, 1993 and 2020 at 0 mm.
Relative humidity in Palm Desert during September averages 32%. The most humid September was 2025 at 45%, and the least humid was 2020 at 20%.
September receives about 6.2 kWh/m²/day of solar energy in Palm Desert. The sunniest Septembers were 2001, 2005 and 2018 at 6.6 kWh/m²/day, and the cloudiest was 1984 at 5.6.
Average wind speed in Palm Desert during September is 2 m/s. The windiest September was 1986 at 2.5 m/s, while the calmest were 1991 and 2012 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.8°C | 28.1°C | 28.6°C | 28.6°C | 29.2°C | +2.4°C |
| Avg High | 34.5°C | 35.7°C | 36.5°C | 36.0°C | 36.5°C | +2°C |
| Avg Low | 19.1°C | 20.5°C | 20.6°C | 21.2°C | 21.9°C | +2.8°C |
| Avg Rain | 14 mm | 11 mm | 5 mm | 8 mm | 14 mm | +0 mm |
September temperatures in Palm Desert have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 8.7°C (1982) to a record high of 46.1°C (2020).
Rainfall in September is about average for rainfall, averaging 10 mm, with a wettest year of 62 mm.
A good time to visit Palm Desert
September is a good time to visit Palm Desert, with days averaging 35.8°C and nights around 20.6°C (mean 28.2°C, warmer than Palm Desert's yearly average) and low rainfall. October and May 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 | 34.4°C | 27.8°C | 21.3°C | 40.3°C | 15.0°C | 32 mm | 45% | 1.9 m/s | 5.7 |
| 2024 | 37.9°C | 30.1°C | 22.3°C | 44.6°C | 12.1°C | 1 mm | 28% | 2 m/s | 6.2 |
| 2023 | 34.3°C | 26.7°C | 19.0°C | 40.8°C | 14.1°C | 23 mm | 43% | 2.1 m/s | 5.8 |
| 2022 | 36.0°C | 29.4°C | 22.8°C | 43.0°C | 14.1°C | 27 mm | 40% | 1.9 m/s | 5.7 |
| 2021 | 37.4°C | 29.9°C | 22.4°C | 42.0°C | 15.2°C | 2 mm | 29% | 2 m/s | 6.3 |
| 2020 🔥 | 39.1°C | 31.2°C | 23.4°C | 46.1°C | 18.8°C | 0 mm | 20% | 1.9 m/s | 6.4 |
| 2019 | 35.3°C | 27.6°C | 19.9°C | 42.2°C | 8.7°C | 11 mm | 35% | 2.2 m/s | 6.2 |
| 2018 | 37.8°C | 29.9°C | 22.0°C | 42.9°C | 18.3°C | 0 mm | 25% | 1.9 m/s | 6.6 |
| 2017 | 33.7°C | 26.7°C | 19.6°C | 41.8°C | 11.1°C | 9 mm | 40% | 2.2 m/s | 6.1 |
| 2016 | 34.2°C | 26.7°C | 19.2°C | 40.3°C | 12.2°C | 13 mm | 34% | 2.3 m/s | 6 |
| 2015 | 36.5°C | 29.6°C | 22.7°C | 40.0°C | 15.6°C | 9 mm | 35% | 1.9 m/s | 5.8 |
| 2014 | 36.5°C | 29.4°C | 22.3°C | 40.5°C | 13.9°C | 5 mm | 35% | 1.9 m/s | 6.2 |
| 2013 | 35.3°C | 27.8°C | 20.3°C | 39.8°C | 10.8°C | 13 mm | 34% | 1.8 m/s | 6.1 |
| 2012 | 36.8°C | 29.9°C | 23.0°C | 40.5°C | 18.4°C | 8 mm | 29% | 1.7 m/s | 6 |
| 2011 | 36.7°C | 29.6°C | 22.5°C | 42.0°C | 15.6°C | 13 mm | 29% | 1.8 m/s | 6.1 |
| 2010 | 37.4°C | 29.0°C | 20.6°C | 43.2°C | 13.5°C | 2 mm | 25% | 2 m/s | 6.5 |
| 2009 | 37.7°C | 29.8°C | 21.9°C | 41.3°C | 13.9°C | 2 mm | 25% | 2.1 m/s | 6.4 |
| 2008 | 37.3°C | 29.4°C | 21.6°C | 41.8°C | 14.1°C | 4 mm | 29% | 1.8 m/s | 6.4 |
| 2007 | 34.7°C | 27.0°C | 19.2°C | 43.1°C | 11.0°C | 6 mm | 32% | 2.2 m/s | 6.3 |
| 2006 | 35.4°C | 27.9°C | 20.3°C | 41.3°C | 11.6°C | 4 mm | 27% | 2 m/s | 6.4 |
| 2005 | 35.4°C | 26.9°C | 18.4°C | 40.1°C | 12.1°C | 4 mm | 28% | 2.2 m/s | 6.6 |
| 2004 | 35.5°C | 27.5°C | 19.5°C | 42.9°C | 12.3°C | 6 mm | 30% | 2.2 m/s | 6.5 |
| 2003 | 38.3°C | 30.6°C | 22.9°C | 41.4°C | 15.9°C | 4 mm | 28% | 1.9 m/s | 6.3 |
| 2002 | 36.9°C | 29.3°C | 21.6°C | 42.8°C | 13.1°C | 7 mm | 28% | 2.1 m/s | 6 |
| 2001 | 37.9°C | 29.8°C | 21.7°C | 39.4°C | 16.3°C | 5 mm | 29% | 2.1 m/s | 6.6 |
| 2000 | 36.0°C | 27.5°C | 19.0°C | 41.5°C | 13.5°C | 13 mm | 31% | 2.1 m/s | 6.2 |
| 1999 | 36.0°C | 28.2°C | 20.5°C | 40.4°C | 13.4°C | 9 mm | 32% | 2 m/s | 6.3 |
| 1998 | 34.8°C | 27.0°C | 19.2°C | 40.0°C | 11.5°C | 5 mm | 38% | 2.1 m/s | 6.1 |
| 1997 🌧️ | 35.8°C | 28.9°C | 22.0°C | 40.9°C | 17.0°C | 62 mm | 39% | 2 m/s | 5.9 |
| 1996 | 35.0°C | 27.1°C | 19.2°C | 42.1°C | 13.8°C | 2 mm | 34% | 2 m/s | 6.2 |
| 1995 | 37.3°C | 29.5°C | 21.6°C | 41.9°C | 12.1°C | 5 mm | 29% | 2.1 m/s | 6.2 |
| 1994 | 35.7°C | 28.1°C | 20.6°C | 40.6°C | 11.9°C | 0 mm | 30% | 2 m/s | 6 |
| 1993 | 35.7°C | 27.6°C | 19.6°C | 42.2°C | 10.3°C | 0 mm | 26% | 1.9 m/s | 6.3 |
| 1992 | 37.2°C | 29.2°C | 21.2°C | 39.6°C | 16.3°C | 0 mm | 25% | 1.8 m/s | 6.3 |
| 1991 | 34.4°C | 27.7°C | 21.0°C | 38.6°C | 12.5°C | 14 mm | 38% | 1.7 m/s | 6 |
| 1990 | 35.3°C | 27.6°C | 19.9°C | 43.5°C | 14.5°C | 8 mm | 33% | 1.9 m/s | 6.2 |
| 1989 | 35.5°C | 27.4°C | 19.3°C | 41.6°C | 11.4°C | 6 mm | 28% | 2.2 m/s | 6.3 |
| 1988 | 35.1°C | 27.1°C | 19.1°C | 40.9°C | 10.8°C | 1 mm | 27% | 2 m/s | 6 |
| 1987 | 35.3°C | 27.4°C | 19.5°C | 39.7°C | 13.4°C | 5 mm | 31% | 2 m/s | 5.8 |
| 1986 ❄️ | 31.7°C | 23.6°C | 15.5°C | 41.1°C | 8.7°C | 15 mm | 35% | 2.5 m/s | 6 |
| 1985 | 31.7°C | 23.9°C | 16.1°C | 39.3°C | 11.1°C | 17 mm | 39% | 2.3 m/s | 5.9 |
| 1984 | 35.8°C | 28.8°C | 21.8°C | 40.1°C | 14.4°C | 9 mm | 37% | 1.8 m/s | 5.6 |
| 1983 | 35.3°C | 28.1°C | 21.0°C | 40.2°C | 13.6°C | 32 mm | 42% | 1.8 m/s | — |
| 1982 | 33.5°C | 26.2°C | 18.8°C | 43.3°C | 8.7°C | 30 mm | 41% | 2.1 m/s | — |
| 1981 | 36.3°C | 28.5°C | 20.7°C | 39.6°C | 15.0°C | 11 mm | 28% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 35.8°C with lows near 20.6°C (mean 28.2°C), based on 45 years of NASA POWER data.
September averages 10 mm of rainfall in Palm Desert, about average for rainfall. The wettest on record was 62 mm in 1997.
The hottest September reached 46.1°C in 2020. The coldest dipped to 8.7°C in 1982.
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 34.5°C to 36°C and overnight lows from 19.7°C to 21.6°C over the same span.
September is one of the warmer months of the year in Palm Desert and about average for rainfall, so plan for around 35.8°C daytime highs and 20.6°C at night.
Not quite — September is the 10th coolest month in Palm Desert, averaging 28.2°C.
For September in Palm Desert, pack light, breathable clothing and sun protection, with typical highs of 35.8°C and lows of 20.6°C.
Relative humidity in September averages 32% — relatively dry.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.5 m/s (1986).
The wettest September on record was 1997 with 62 mm. On average, September sees 10 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 Palm Desert 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.
