September is one of the warmer months of the year in Prescott, with average highs near 29.2°C and lows around 14.5°C (mean 21.9°C). It is about average for rainfall, averaging 38 mm of rainfall and 43% relative humidity across the period.
September is one of the warmer months of the year in Prescott. Across 45 years of records, the warmest September in Prescott was 2024 — when the month averaged 24.6°C — while the coldest was 1986 at 18°C. Typical September days reach 29.2°C with nights near 14.5°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Prescott, averaging 38 mm of rainfall. The wettest September on record was 1983 with 155 mm, while the driest was 2000 at 1 mm.
Relative humidity in Prescott during September averages 43%. The most humid September was 1983 at 57%, and the least humid was 2020 at 24%.
September receives about 6 kWh/m²/day of solar energy in Prescott. The sunniest September was 1993 at 6.6 kWh/m²/day, and the cloudiest were 1997 and 2025 at 5.5.
Average wind speed in Prescott during September is 1.8 m/s. The windiest Septembers were 1985, 1989 and 2004 at 2.1 m/s, while the calmest was 2021 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.6°C | 21.5°C | 22.1°C | 22.2°C | 23.4°C | +2.8°C |
| Avg High | 27.9°C | 28.8°C | 29.7°C | 29.5°C | 30.8°C | +2.9°C |
| Avg Low | 13.3°C | 14.3°C | 14.5°C | 14.8°C | 16.0°C | +2.7°C |
| Avg Rain | 46 mm | 49 mm | 28 mm | 33 mm | 33 mm | -13 mm |
September temperatures in Prescott have risen by about 2.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 3.2°C (1986) to a record high of 39.2°C (2020).
Rainfall in September is about average for rainfall, averaging 38 mm, with a wettest year of 155 mm.
One of the best times to visit Prescott
September is one of the best times to visit Prescott. Expect days averaging 29.2°C and nights around 14.5°C (mean 21.9°C) — warmer than Prescott's yearly average — with moderate rainfall (38 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 | 29.4°C | 22.5°C | 15.7°C | 33.7°C | 10.9°C | 68 mm | 48% | 1.8 m/s | 5.5 |
| 2024 🔥 | 32.4°C | 24.6°C | 16.7°C | 38.5°C | 9.8°C | 7 mm | 28% | 1.9 m/s | 6.3 |
| 2023 | 29.6°C | 22.4°C | 15.1°C | 36.8°C | 10.6°C | 29 mm | 39% | 1.8 m/s | 5.7 |
| 2022 | 30.6°C | 23.7°C | 16.7°C | 36.8°C | 11.5°C | 50 mm | 49% | 1.5 m/s | 5.7 |
| 2021 | 29.8°C | 22.9°C | 16.0°C | 37.1°C | 9.3°C | 42 mm | 49% | 1.4 m/s | 5.7 |
| 2020 | 33.0°C | 24.3°C | 15.7°C | 39.2°C | 8.2°C | 2 mm | 24% | 1.8 m/s | 6.3 |
| 2019 | 29.2°C | 21.9°C | 14.7°C | 36.4°C | 8.1°C | 61 mm | 44% | 1.9 m/s | 5.9 |
| 2018 | 30.9°C | 23.9°C | 16.8°C | 34.2°C | 13.4°C | 9 mm | 40% | 1.5 m/s | 6.2 |
| 2017 | 28.6°C | 21.0°C | 13.4°C | 35.8°C | 4.3°C | 14 mm | 41% | 1.8 m/s | 6.2 |
| 2016 | 27.1°C | 20.1°C | 13.0°C | 32.9°C | 5.0°C | 32 mm | 48% | 1.9 m/s | 5.7 |
| 2015 | 29.9°C | 22.8°C | 15.8°C | 34.3°C | 11.6°C | 26 mm | 50% | 1.6 m/s | 5.7 |
| 2014 | 28.9°C | 22.1°C | 15.3°C | 32.6°C | 7.6°C | 67 mm | 54% | 1.5 m/s | 5.9 |
| 2013 | 27.8°C | 20.7°C | 13.7°C | 33.6°C | 5.1°C | 49 mm | 50% | 1.7 m/s | 5.8 |
| 2012 | 29.3°C | 22.1°C | 15.0°C | 32.8°C | 12.0°C | 32 mm | 48% | 1.5 m/s | 5.6 |
| 2011 | 31.0°C | 23.2°C | 15.4°C | 36.2°C | 11.3°C | 29 mm | 37% | 1.7 m/s | 5.8 |
| 2010 | 32.0°C | 23.7°C | 15.3°C | 35.0°C | 9.7°C | 6 mm | 31% | 1.8 m/s | 6.5 |
| 2009 | 30.0°C | 22.6°C | 15.3°C | 33.9°C | 10.0°C | 29 mm | 38% | 1.7 m/s | 6 |
| 2008 | 29.8°C | 22.2°C | 14.7°C | 34.6°C | 10.6°C | 17 mm | 41% | 1.7 m/s | 6.1 |
| 2007 | 28.9°C | 21.5°C | 14.1°C | 35.5°C | 5.4°C | 31 mm | 44% | 1.9 m/s | 6.1 |
| 2006 | 27.5°C | 19.8°C | 12.1°C | 33.6°C | 5.5°C | 44 mm | 46% | 1.7 m/s | 6.1 |
| 2005 | 29.1°C | 21.7°C | 14.3°C | 32.6°C | 9.7°C | 9 mm | 38% | 1.8 m/s | 6.2 |
| 2004 | 29.1°C | 21.4°C | 13.7°C | 35.4°C | 5.7°C | 46 mm | 36% | 2.1 m/s | 6.3 |
| 2003 | 30.9°C | 23.0°C | 15.1°C | 34.4°C | 9.9°C | 28 mm | 40% | 1.7 m/s | 6.1 |
| 2002 | 29.4°C | 22.1°C | 14.8°C | 35.9°C | 8.3°C | 64 mm | 42% | 1.9 m/s | 5.8 |
| 2001 | 31.8°C | 23.9°C | 16.0°C | 34.5°C | 11.6°C | 14 mm | 32% | 1.9 m/s | 6.4 |
| 2000 | 30.4°C | 22.6°C | 14.7°C | 35.7°C | 6.2°C | 1 mm | 35% | 2 m/s | 6.2 |
| 1999 | 29.2°C | 21.4°C | 13.6°C | 34.0°C | 6.7°C | 74 mm | 47% | 1.8 m/s | 6 |
| 1998 | 28.4°C | 21.3°C | 14.1°C | 32.5°C | 8.2°C | 38 mm | 47% | 2 m/s | 5.8 |
| 1997 | 29.4°C | 22.7°C | 15.9°C | 34.6°C | 10.1°C | 97 mm | 52% | 1.8 m/s | 5.5 |
| 1996 | 26.8°C | 19.8°C | 12.8°C | 33.2°C | 7.4°C | 53 mm | 51% | 1.7 m/s | 5.7 |
| 1995 | 29.5°C | 22.4°C | 15.3°C | 35.4°C | 6.2°C | 59 mm | 44% | 1.7 m/s | 6.1 |
| 1994 | 29.3°C | 22.1°C | 14.9°C | 33.4°C | 7.0°C | 48 mm | 45% | 1.7 m/s | 5.8 |
| 1993 | 29.5°C | 21.2°C | 13.0°C | 33.9°C | 7.2°C | 7 mm | 35% | 1.8 m/s | 6.6 |
| 1992 | 29.3°C | 21.8°C | 14.4°C | 31.4°C | 9.3°C | 6 mm | 42% | 1.7 m/s | 6.4 |
| 1991 | 28.2°C | 21.2°C | 14.2°C | 33.6°C | 9.8°C | 29 mm | 48% | 1.6 m/s | 5.8 |
| 1990 | 27.9°C | 21.4°C | 14.9°C | 36.3°C | 8.4°C | 76 mm | 54% | 1.7 m/s | 5.7 |
| 1989 | 29.7°C | 21.8°C | 14.0°C | 34.0°C | 5.5°C | 5 mm | 30% | 2.1 m/s | 6.4 |
| 1988 | 28.1°C | 20.0°C | 11.9°C | 32.2°C | 6.5°C | 3 mm | 40% | 1.9 m/s | 6.2 |
| 1987 | 28.5°C | 20.8°C | 13.2°C | 32.5°C | 9.6°C | 23 mm | 39% | 1.6 m/s | 5.9 |
| 1986 ❄️ | 25.3°C | 18.0°C | 10.8°C | 34.4°C | 3.2°C | 51 mm | 44% | 2 m/s | 5.7 |
| 1985 | 25.6°C | 18.2°C | 10.9°C | 30.5°C | 5.9°C | 42 mm | 45% | 2.1 m/s | 5.8 |
| 1984 | 28.5°C | 21.5°C | 14.4°C | 33.2°C | 8.7°C | 51 mm | 51% | 1.7 m/s | 5.8 |
| 1983 🌧️ | 28.7°C | 22.2°C | 15.8°C | 34.2°C | 10.6°C | 155 mm | 57% | 1.8 m/s | — |
| 1982 | 27.5°C | 20.6°C | 13.6°C | 36.4°C | 4.2°C | 41 mm | 51% | 2 m/s | — |
| 1981 | 29.1°C | 21.9°C | 14.7°C | 32.6°C | 8.9°C | 43 mm | 45% | 1.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.2°C with lows near 14.5°C (mean 21.9°C), based on 45 years of NASA POWER data.
September averages 38 mm of rainfall in Prescott, about average for rainfall. The wettest on record was 155 mm in 1983.
The hottest September reached 39.2°C in 2020. The coldest dipped to 3.2°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.3°C. Daytime highs moved from 27.9°C to 30.4°C and overnight lows from 13.9°C to 16°C over the same span.
September is one of the warmer months of the year in Prescott and about average for rainfall, so plan for around 29.2°C daytime highs and 14.5°C at night.
Not quite — September is the 9th coolest month in Prescott, averaging 21.9°C.
For September in Prescott, pack light layers you can adjust through the day, with typical highs of 29.2°C and lows of 14.5°C.
Relative humidity in September averages 43% — relatively dry.
Average wind speed in September is 1.8 m/s. The windiest September on record averaged 2.1 m/s (1985).
The wettest September on record was 1983 with 155 mm. On average, September sees 38 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 Prescott 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.
