September is one of the warmer months of the year in Hot Springs National Park, with average highs near 30.9°C and lows around 17.3°C (mean 24.1°C). It is one of the drier months, averaging 87 mm of rainfall and 67% relative humidity across the period.
September is one of the warmer months of the year in Hot Springs National Park. Across 45 years of records, the warmest September in Hot Springs National Park was 2019 — when the month averaged 28.4°C — while the coldest were 1989 and 2008 at 21.6°C. Typical September days reach 30.9°C with nights near 17.3°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Hot Springs National Park, averaging 87 mm of rainfall. The wettest September on record was 2008 with 270 mm, while the driest was 2017 at 9 mm.
Relative humidity in Hot Springs National Park during September averages 67%. The most humid September was 2009 at 84%, and the least humid was 2000 at 51%.
September receives about 4.8 kWh/m²/day of solar energy in Hot Springs National Park. The sunniest September was 2022 at 5.6 kWh/m²/day, and the cloudiest was 2009 at 3.9.
Average wind speed in Hot Springs National Park during September is 0.2 m/s. The windiest Septembers were 2008, 2016 and 2025, among others at 0.3 m/s, while the calmest were 2022, 2023 and 2024, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.6°C | 23.7°C | 23.6°C | 24.9°C | 24.9°C | +1.3°C |
| Avg High | 30.4°C | 30.7°C | 30.2°C | 31.6°C | 31.7°C | +1.3°C |
| Avg Low | 16.7°C | 16.7°C | 17.1°C | 18.2°C | 18.1°C | +1.4°C |
| Avg Rain | 80 mm | 92 mm | 119 mm | 68 mm | 65 mm | -15 mm |
September temperatures in Hot Springs National Park have risen by about 2.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.8°C (1989) to a record high of 43.1°C (2000).
Rainfall in September is one of the drier months, averaging 87 mm, with a wettest year of 270 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Hot Springs National Park
September is one of the best times to visit Hot Springs National Park. Expect days averaging 30.9°C and nights around 17.3°C (mean 24.1°C) — warmer than Hot Springs National Park's yearly average — with higher rainfall (87 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 | 31.9°C | 25.2°C | 18.5°C | 36.9°C | 11.3°C | 90 mm | 66% | 0.3 m/s | 4.9 |
| 2024 | 31.4°C | 24.8°C | 18.2°C | 37.0°C | 10.0°C | 50 mm | 66% | 0.2 m/s | 4.6 |
| 2023 | 34.1°C | 26.3°C | 18.6°C | 39.7°C | 14.2°C | 28 mm | 59% | 0.2 m/s | 5 |
| 2022 | 32.8°C | 25.2°C | 17.6°C | 38.3°C | 9.1°C | 43 mm | 61% | 0.2 m/s | 5.6 |
| 2021 | 32.6°C | 25.4°C | 18.3°C | 37.5°C | 10.5°C | 40 mm | 66% | 0.2 m/s | 5 |
| 2020 | 27.4°C | 22.3°C | 17.3°C | 32.7°C | 8.4°C | 137 mm | 83% | 0.2 m/s | 4.2 |
| 2019 🔥 | 35.1°C | 28.4°C | 21.7°C | 39.5°C | 19.6°C | 29 mm | 67% | 0.2 m/s | 5.2 |
| 2018 | 30.1°C | 24.7°C | 19.2°C | 36.8°C | 13.3°C | 191 mm | 80% | 0.2 m/s | 4.2 |
| 2017 | 30.9°C | 24.2°C | 17.4°C | 35.4°C | 10.2°C | 9 mm | 65% | 0.2 m/s | 5.3 |
| 2016 | 31.3°C | 25.0°C | 18.7°C | 34.1°C | 11.7°C | 38 mm | 73% | 0.3 m/s | 5.5 |
| 2015 | 32.5°C | 25.4°C | 18.3°C | 37.5°C | 10.8°C | 30 mm | 62% | 0.2 m/s | 5.2 |
| 2014 | 30.9°C | 24.4°C | 18.0°C | 37.1°C | 9.9°C | 55 mm | 71% | 0.2 m/s | 4.8 |
| 2013 | 32.8°C | 25.4°C | 18.1°C | 39.1°C | 10.7°C | 84 mm | 64% | 0.2 m/s | 5.3 |
| 2012 | 30.0°C | 23.6°C | 17.3°C | 41.6°C | 8.6°C | 153 mm | 74% | 0.2 m/s | 5 |
| 2011 | 30.0°C | 22.5°C | 15.1°C | 38.2°C | 10.0°C | 51 mm | 61% | 0.2 m/s | 5.2 |
| 2010 | 32.2°C | 25.3°C | 18.4°C | 37.1°C | 10.3°C | 41 mm | 65% | 0.2 m/s | 4.9 |
| 2009 | 26.7°C | 21.9°C | 17.1°C | 33.4°C | 8.6°C | 244 mm | 84% | 0.2 m/s | 3.9 |
| 2008 🌧️ | 26.9°C | 21.6°C | 16.4°C | 31.9°C | 10.8°C | 270 mm | 83% | 0.3 m/s | 4.7 |
| 2007 | 30.1°C | 24.1°C | 18.1°C | 35.2°C | 11.0°C | 151 mm | 74% | 0.2 m/s | 4.6 |
| 2006 | 29.1°C | 22.0°C | 14.9°C | 34.4°C | 6.7°C | 104 mm | 67% | 0.2 m/s | 5.2 |
| 2005 | 33.3°C | 26.4°C | 19.6°C | 38.8°C | 9.0°C | 121 mm | 64% | 0.2 m/s | 5.2 |
| 2004 | 32.0°C | 24.3°C | 16.7°C | 35.4°C | 11.2°C | 17 mm | 59% | 0.2 m/s | 5.5 |
| 2003 | 29.1°C | 22.5°C | 15.9°C | 33.7°C | 7.3°C | 84 mm | 70% | 0.2 m/s | 5 |
| 2002 | 32.4°C | 25.3°C | 18.2°C | 36.9°C | 10.7°C | 59 mm | 63% | 0.2 m/s | 5 |
| 2001 | 29.6°C | 22.8°C | 16.1°C | 34.2°C | 7.9°C | 71 mm | 67% | 0.2 m/s | 5 |
| 2000 | 33.0°C | 25.5°C | 18.0°C | 43.1°C | 6.5°C | 68 mm | 51% | 0.2 m/s | 5 |
| 1999 | 31.4°C | 23.7°C | 15.9°C | 37.0°C | 8.0°C | 57 mm | 54% | 0.2 m/s | 5.3 |
| 1998 | 32.7°C | 26.2°C | 19.7°C | 38.7°C | 14.7°C | 149 mm | 67% | 0.2 m/s | 4.9 |
| 1997 | 32.1°C | 24.5°C | 16.9°C | 36.3°C | 10.1°C | 78 mm | 62% | 0.2 m/s | 4.9 |
| 1996 | 29.6°C | 22.6°C | 15.7°C | 34.6°C | 6.5°C | 121 mm | 68% | 0.3 m/s | 4.5 |
| 1995 | 30.4°C | 23.2°C | 16.0°C | 39.6°C | 5.9°C | 75 mm | 62% | 0.2 m/s | 4.1 |
| 1994 | 30.0°C | 22.4°C | 14.7°C | 35.4°C | 6.3°C | 51 mm | 69% | 0.2 m/s | 5.1 |
| 1993 | 31.0°C | 23.3°C | 15.6°C | 37.0°C | 9.2°C | 69 mm | 65% | 0.2 m/s | 4.8 |
| 1992 | 29.4°C | 22.8°C | 16.1°C | 35.0°C | 5.8°C | 110 mm | 72% | 0.2 m/s | 4.5 |
| 1991 | 28.1°C | 22.5°C | 16.9°C | 35.2°C | 6.5°C | 97 mm | 76% | 0.2 m/s | 4.5 |
| 1990 | 31.8°C | 25.4°C | 19.0°C | 40.1°C | 6.9°C | 115 mm | 68% | 0.2 m/s | 4.5 |
| 1989 ❄️ | 27.8°C | 21.6°C | 15.5°C | 36.0°C | 4.8°C | 102 mm | 75% | 0.2 m/s | 4.3 |
| 1988 | 31.7°C | 24.6°C | 17.6°C | 36.4°C | 9.3°C | 114 mm | 68% | 0.2 m/s | 4.6 |
| 1987 | 31.4°C | 24.3°C | 17.1°C | 36.3°C | 11.3°C | 119 mm | 63% | 0.3 m/s | 4.7 |
| 1986 | 30.8°C | 25.0°C | 19.2°C | 33.9°C | 13.8°C | 74 mm | 73% | 0.2 m/s | 4.3 |
| 1985 | 29.8°C | 23.1°C | 16.4°C | 39.2°C | 6.4°C | 100 mm | 67% | 0.2 m/s | 4.5 |
| 1984 | 28.5°C | 22.0°C | 15.5°C | 35.4°C | 5.5°C | 106 mm | 71% | 0.2 m/s | 4.8 |
| 1983 | 32.1°C | 24.6°C | 17.0°C | 36.6°C | 7.1°C | 28 mm | 58% | 0.2 m/s | — |
| 1982 | 30.8°C | 23.4°C | 16.0°C | 36.0°C | 6.3°C | 21 mm | 64% | 0.2 m/s | — |
| 1981 | 30.9°C | 23.6°C | 16.2°C | 35.4°C | 7.0°C | 51 mm | 64% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.9°C with lows near 17.3°C (mean 24.1°C), based on 45 years of NASA POWER data.
September averages 87 mm of rainfall in Hot Springs National Park, one of the drier months. The wettest on record was 270 mm in 2008.
The hottest September reached 43.1°C in 2000. The coldest dipped to 4.8°C in 1989.
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 30.4°C to 32.6°C and overnight lows from 16.2°C to 18.2°C over the same span.
September is one of the warmer months of the year in Hot Springs National Park and one of the drier months, so plan for around 30.9°C daytime highs and 17.3°C at night.
Not quite — September is the 9th coolest month in Hot Springs National Park, averaging 24.1°C.
For September in Hot Springs National Park, pack light, breathable clothing and sun protection, with typical highs of 30.9°C and lows of 17.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 67% — moderately humid.
Average wind speed in September is 0.2 m/s. The windiest September on record averaged 0.3 m/s (1987).
The wettest September on record was 2008 with 270 mm. On average, September sees 87 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 Hot Springs National Park 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.
