September is one of the warmer months of the year in Desert Hot Springs, with average highs near 33.1°C and lows around 18.1°C (mean 25.6°C). It is about average for rainfall, averaging 9 mm of rainfall and 32% relative humidity across the period.
September is one of the warmer months of the year in Desert Hot Springs. Across 45 years of records, the warmest September in Desert Hot Springs was 2020 — when the month averaged 28.4°C — while the coldest was 1986 at 21°C. Typical September days reach 33.1°C with nights near 18.1°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Desert Hot Springs, averaging 9 mm of rainfall. The wettest September on record was 1997 with 67 mm, while the driest were 1993, 2018 and 2020, among others at 0 mm.
Relative humidity in Desert Hot Springs during September averages 32%. The most humid September was 2025 at 46%, and the least humid was 2020 at 19%.
September receives about 6.2 kWh/m²/day of solar energy in Desert Hot Springs. 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 Desert Hot Springs during September is 2.1 m/s. The windiest September was 1986 at 2.6 m/s, while the calmest was 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 | 24.1°C | 25.4°C | 25.9°C | 26.0°C | 26.8°C | +2.7°C |
| Avg High | 31.7°C | 33.0°C | 33.7°C | 33.3°C | 34.0°C | +2.3°C |
| Avg Low | 16.5°C | 17.9°C | 18.1°C | 18.7°C | 19.7°C | +3.2°C |
| Avg Rain | 12 mm | 12 mm | 5 mm | 7 mm | 11 mm | -1 mm |
September temperatures in Desert Hot Springs have risen by about 2.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.7°C (1982) to a record high of 43°C (2020).
Rainfall in September is about average for rainfall, averaging 9 mm, with a wettest year of 67 mm.
One of the best times to visit Desert Hot Springs
September is one of the best times to visit Desert Hot Springs. Expect days averaging 33.1°C and nights around 18.1°C (mean 25.6°C) — warmer than Desert Hot Springs's yearly average — with low rainfall (9 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 | 31.8°C | 25.3°C | 18.8°C | 38.2°C | 12.9°C | 35 mm | 46% | 1.9 m/s | 5.7 |
| 2024 | 35.2°C | 27.7°C | 20.1°C | 41.3°C | 9.4°C | 3 mm | 28% | 2 m/s | 6.2 |
| 2023 | 32.1°C | 24.7°C | 17.3°C | 38.4°C | 11.2°C | 15 mm | 42% | 2 m/s | 5.8 |
| 2022 | 33.9°C | 27.3°C | 20.6°C | 41.0°C | 12.3°C | 14 mm | 39% | 1.9 m/s | 5.7 |
| 2021 | 34.9°C | 27.6°C | 20.3°C | 39.8°C | 12.7°C | 2 mm | 28% | 2 m/s | 6.3 |
| 2020 🔥 | 36.1°C | 28.4°C | 20.8°C | 43.0°C | 15.9°C | 0 mm | 19% | 2 m/s | 6.4 |
| 2019 | 32.5°C | 25.0°C | 17.4°C | 39.3°C | 6.3°C | 8 mm | 35% | 2.3 m/s | 6.2 |
| 2018 | 35.4°C | 27.7°C | 20.1°C | 40.1°C | 16.5°C | 0 mm | 23% | 1.9 m/s | 6.6 |
| 2017 | 30.9°C | 23.8°C | 16.8°C | 38.6°C | 7.9°C | 12 mm | 42% | 2.3 m/s | 6.1 |
| 2016 | 31.5°C | 24.1°C | 16.6°C | 37.9°C | 9.7°C | 10 mm | 33% | 2.3 m/s | 6 |
| 2015 | 34.0°C | 27.1°C | 20.2°C | 37.2°C | 13.1°C | 7 mm | 35% | 2 m/s | 5.8 |
| 2014 | 33.8°C | 26.8°C | 19.7°C | 38.3°C | 11.1°C | 7 mm | 36% | 1.9 m/s | 6.2 |
| 2013 | 32.4°C | 25.1°C | 17.7°C | 36.7°C | 8.7°C | 7 mm | 33% | 1.9 m/s | 6.1 |
| 2012 | 33.9°C | 27.0°C | 20.2°C | 37.7°C | 15.7°C | 9 mm | 30% | 1.7 m/s | 6 |
| 2011 | 34.0°C | 27.0°C | 20.0°C | 38.9°C | 13.7°C | 10 mm | 28% | 1.8 m/s | 6.1 |
| 2010 | 34.9°C | 26.5°C | 18.1°C | 40.0°C | 11.1°C | 1 mm | 23% | 2.1 m/s | 6.5 |
| 2009 | 34.9°C | 27.2°C | 19.5°C | 38.2°C | 10.6°C | 1 mm | 24% | 2.2 m/s | 6.4 |
| 2008 | 34.5°C | 26.9°C | 19.2°C | 38.9°C | 12.4°C | 3 mm | 27% | 1.8 m/s | 6.4 |
| 2007 | 32.1°C | 24.4°C | 16.6°C | 39.9°C | 7.9°C | 7 mm | 32% | 2.2 m/s | 6.3 |
| 2006 | 32.6°C | 25.1°C | 17.6°C | 38.2°C | 9.7°C | 3 mm | 26% | 2.1 m/s | 6.4 |
| 2005 | 32.5°C | 24.2°C | 15.9°C | 37.2°C | 10.0°C | 5 mm | 27% | 2.3 m/s | 6.6 |
| 2004 | 32.5°C | 24.7°C | 16.8°C | 40.3°C | 8.3°C | 11 mm | 29% | 2.2 m/s | 6.5 |
| 2003 | 35.5°C | 27.9°C | 20.3°C | 38.2°C | 13.5°C | 3 mm | 27% | 2 m/s | 6.3 |
| 2002 | 34.1°C | 26.6°C | 19.2°C | 39.4°C | 10.6°C | 3 mm | 26% | 2.2 m/s | 6 |
| 2001 | 35.2°C | 27.4°C | 19.6°C | 36.9°C | 15.2°C | 6 mm | 27% | 2.2 m/s | 6.6 |
| 2000 | 33.3°C | 24.8°C | 16.4°C | 38.7°C | 10.6°C | 8 mm | 31% | 2.1 m/s | 6.2 |
| 1999 | 33.3°C | 25.7°C | 18.2°C | 37.8°C | 11.7°C | 8 mm | 31% | 2 m/s | 6.3 |
| 1998 | 32.0°C | 24.2°C | 16.4°C | 36.7°C | 8.6°C | 8 mm | 39% | 2.1 m/s | 6.1 |
| 1997 🌧️ | 32.8°C | 25.9°C | 19.0°C | 38.2°C | 14.2°C | 67 mm | 41% | 2.1 m/s | 5.9 |
| 1996 | 32.2°C | 24.5°C | 16.8°C | 39.2°C | 10.9°C | 2 mm | 32% | 2 m/s | 6.2 |
| 1995 | 34.6°C | 26.9°C | 19.2°C | 38.9°C | 10.0°C | 4 mm | 28% | 2.2 m/s | 6.2 |
| 1994 | 32.9°C | 25.6°C | 18.2°C | 38.0°C | 9.0°C | 2 mm | 29% | 2.2 m/s | 6 |
| 1993 | 33.0°C | 24.9°C | 16.8°C | 39.0°C | 8.6°C | 0 mm | 24% | 2 m/s | 6.3 |
| 1992 | 34.2°C | 26.4°C | 18.5°C | 36.5°C | 13.5°C | 0 mm | 24% | 2 m/s | 6.3 |
| 1991 | 31.9°C | 25.1°C | 18.4°C | 35.6°C | 8.9°C | 17 mm | 38% | 1.8 m/s | 6 |
| 1990 | 32.6°C | 25.0°C | 17.5°C | 40.5°C | 12.2°C | 7 mm | 33% | 2.1 m/s | 6.2 |
| 1989 | 32.7°C | 24.7°C | 16.7°C | 38.9°C | 8.4°C | 3 mm | 27% | 2.4 m/s | 6.3 |
| 1988 | 32.3°C | 24.3°C | 16.4°C | 37.4°C | 7.7°C | 1 mm | 27% | 2 m/s | 6 |
| 1987 | 32.7°C | 25.0°C | 17.2°C | 37.2°C | 10.7°C | 6 mm | 30% | 2.1 m/s | 5.8 |
| 1986 ❄️ | 28.9°C | 21.0°C | 13.0°C | 38.3°C | 6.4°C | 6 mm | 33% | 2.6 m/s | 6 |
| 1985 | 28.8°C | 21.1°C | 13.4°C | 36.8°C | 8.0°C | 17 mm | 39% | 2.4 m/s | 5.9 |
| 1984 | 33.1°C | 26.0°C | 18.8°C | 37.7°C | 11.2°C | 9 mm | 38% | 1.8 m/s | 5.6 |
| 1983 | 32.2°C | 25.3°C | 18.4°C | 37.4°C | 11.6°C | 35 mm | 44% | 1.8 m/s | — |
| 1982 | 30.9°C | 23.5°C | 16.2°C | 40.4°C | 5.7°C | 22 mm | 40% | 2.3 m/s | — |
| 1981 | 33.4°C | 25.9°C | 18.5°C | 36.9°C | 13.1°C | 8 mm | 28% | 2.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.1°C with lows near 18.1°C (mean 25.6°C), based on 45 years of NASA POWER data.
September averages 9 mm of rainfall in Desert Hot Springs, about average for rainfall. The wettest on record was 67 mm in 1997.
The hottest September reached 43°C in 2020. The coldest dipped to 5.7°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.1°C. Daytime highs moved from 31.7°C to 33.6°C and overnight lows from 17.1°C to 19.4°C over the same span.
September is one of the warmer months of the year in Desert Hot Springs and about average for rainfall, so plan for around 33.1°C daytime highs and 18.1°C at night.
Not quite — September is the 9th coolest month in Desert Hot Springs, averaging 25.6°C.
For September in Desert Hot Springs, pack light, breathable clothing and sun protection, with typical highs of 33.1°C and lows of 18.1°C.
Relative humidity in September averages 32% — relatively dry.
Average wind speed in September is 2.1 m/s. The windiest September on record averaged 2.6 m/s (1986).
The wettest September on record was 1997 with 67 mm. On average, September sees 9 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 Desert Hot Springs 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.
