September is one of the warmer months of the year in Amarillo, with average highs near 29.5°C and lows around 15.3°C (mean 22.4°C). It is about average for rainfall, averaging 51 mm of rainfall and 53% relative humidity across the period.
September is one of the warmer months of the year in Amarillo. Across 45 years of records, the warmest September in Amarillo was 2019 — when the month averaged 25.5°C — while the coldest was 2006 at 19.1°C. Typical September days reach 29.5°C with nights near 15.3°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Amarillo, averaging 51 mm of rainfall. The wettest September on record was 1985 with 149 mm, while the driest was 2000 at 3 mm.
Relative humidity in Amarillo during September averages 53%. The most humid September was 2014 at 68%, and the least humid was 2000 at 31%.
September receives about 5.4 kWh/m²/day of solar energy in Amarillo. The sunniest Septembers were 2001, 2010 and 2022, among others at 5.9 kWh/m²/day, and the cloudiest was 1995 at 4.9.
Average wind speed in Amarillo during September is 3.3 m/s. The windiest September was 2019 at 3.8 m/s, while the calmest was 1990 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.4°C | 21.9°C | 22.0°C | 23.2°C | 24.0°C | +2.6°C |
| Avg High | 28.3°C | 29.0°C | 29.2°C | 30.1°C | 31.8°C | +3.5°C |
| Avg Low | 14.5°C | 14.8°C | 14.7°C | 16.3°C | 16.4°C | +1.9°C |
| Avg Rain | 71 mm | 52 mm | 43 mm | 54 mm | 26 mm | -44 mm |
September temperatures in Amarillo have risen by about 2.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -1.5°C (1985) to a record high of 40.8°C (2023).
Rainfall in September is about average for rainfall, averaging 51 mm, with a wettest year of 149 mm.
One of the best times to visit Amarillo
September is one of the best times to visit Amarillo. Expect days averaging 29.5°C and nights around 15.3°C (mean 22.4°C) — warmer than Amarillo's yearly average — with moderate rainfall (51 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 | 30.7°C | 23.6°C | 16.5°C | 37.3°C | 12.8°C | 30 mm | 53% | 3 m/s | 5.3 |
| 2024 | 31.9°C | 24.1°C | 16.4°C | 38.1°C | 9.1°C | 44 mm | 49% | 3 m/s | 5.8 |
| 2023 | 33.1°C | 25.4°C | 17.7°C | 40.8°C | 13.6°C | 36 mm | 47% | 3.1 m/s | 5.5 |
| 2022 | 33.0°C | 25.1°C | 17.3°C | 36.2°C | 11.8°C | 8 mm | 46% | 3.2 m/s | 5.9 |
| 2021 | 32.3°C | 24.8°C | 17.4°C | 39.1°C | 9.6°C | 20 mm | 45% | 3.6 m/s | 5.8 |
| 2020 | 29.6°C | 21.3°C | 13.1°C | 37.4°C | 2.5°C | 18 mm | 50% | 3 m/s | 5.4 |
| 2019 🔥 | 31.8°C | 25.5°C | 19.1°C | 35.9°C | 15.1°C | 72 mm | 57% | 3.8 m/s | 5.5 |
| 2018 | 29.2°C | 22.4°C | 15.6°C | 34.3°C | 8.3°C | 50 mm | 61% | 3.5 m/s | 5.3 |
| 2017 | 29.3°C | 22.2°C | 15.0°C | 36.2°C | 10.4°C | 75 mm | 56% | 3.3 m/s | 5.1 |
| 2016 | 28.9°C | 22.5°C | 16.1°C | 34.2°C | 9.5°C | 42 mm | 62% | 3.4 m/s | 5.6 |
| 2015 | 31.8°C | 24.9°C | 17.9°C | 36.6°C | 14.1°C | 23 mm | 53% | 3.5 m/s | 5.5 |
| 2014 | 27.1°C | 21.3°C | 15.4°C | 36.7°C | 6.8°C | 93 mm | 68% | 3.3 m/s | 5 |
| 2013 | 30.9°C | 24.0°C | 17.0°C | 36.5°C | 7.3°C | 52 mm | 49% | 3.3 m/s | 5.6 |
| 2012 | 29.9°C | 22.4°C | 14.9°C | 37.7°C | 7.6°C | 84 mm | 48% | 2.8 m/s | 5.5 |
| 2011 | 30.5°C | 22.7°C | 15.0°C | 37.5°C | 10.0°C | 28 mm | 39% | 3.1 m/s | 5.6 |
| 2010 | 32.0°C | 24.4°C | 16.8°C | 38.1°C | 10.2°C | 23 mm | 52% | 3.5 m/s | 5.9 |
| 2009 | 27.4°C | 20.5°C | 13.6°C | 35.9°C | 5.5°C | 33 mm | 57% | 3 m/s | 5.2 |
| 2008 | 28.2°C | 20.9°C | 13.7°C | 33.7°C | 10.6°C | 28 mm | 57% | 3.1 m/s | 5.5 |
| 2007 | 29.5°C | 22.7°C | 15.9°C | 36.3°C | 9.3°C | 63 mm | 63% | 3.4 m/s | 5.5 |
| 2006 ❄️ | 25.7°C | 19.1°C | 12.6°C | 32.4°C | 7.5°C | 65 mm | 59% | 3 m/s | 5.5 |
| 2005 | 31.5°C | 24.2°C | 16.9°C | 36.4°C | 9.2°C | 9 mm | 50% | 3.6 m/s | 5.7 |
| 2004 | 28.5°C | 21.9°C | 15.2°C | 35.9°C | 9.1°C | 106 mm | 56% | 3.4 m/s | 5.6 |
| 2003 | 28.0°C | 20.8°C | 13.5°C | 34.8°C | 5.9°C | 48 mm | 54% | 3.5 m/s | 5.7 |
| 2002 | 30.2°C | 22.5°C | 14.9°C | 35.1°C | 9.9°C | 37 mm | 49% | 3.4 m/s | 5.6 |
| 2001 | 30.0°C | 22.3°C | 14.6°C | 34.9°C | 7.9°C | 33 mm | 52% | 3.1 m/s | 5.9 |
| 2000 | 33.5°C | 24.7°C | 15.9°C | 39.9°C | 2.6°C | 3 mm | 31% | 3.7 m/s | 5.9 |
| 1999 | 27.6°C | 20.7°C | 13.8°C | 36.0°C | 2.7°C | 59 mm | 54% | 3.1 m/s | 5 |
| 1998 | 33.1°C | 25.4°C | 17.8°C | 37.2°C | 12.0°C | 22 mm | 46% | 2.9 m/s | 5.7 |
| 1997 | 31.0°C | 23.8°C | 16.6°C | 37.6°C | 8.7°C | 54 mm | 55% | 3.2 m/s | 5.2 |
| 1996 | 26.7°C | 19.9°C | 13.1°C | 32.9°C | 3.5°C | 73 mm | 60% | 2.9 m/s | 5.4 |
| 1995 | 28.0°C | 21.1°C | 14.2°C | 39.7°C | 2.2°C | 88 mm | 58% | 3.2 m/s | 4.9 |
| 1994 | 30.0°C | 22.2°C | 14.4°C | 35.3°C | 6.0°C | 35 mm | 50% | 3.2 m/s | 5.5 |
| 1993 | 29.4°C | 21.5°C | 13.5°C | 34.1°C | 5.5°C | 32 mm | 49% | 3.7 m/s | 5.3 |
| 1992 | 29.5°C | 21.9°C | 14.4°C | 35.0°C | 8.2°C | 8 mm | 51% | 3.7 m/s | 5.6 |
| 1991 | 25.4°C | 19.5°C | 13.5°C | 32.6°C | 4.8°C | 75 mm | 64% | 3.3 m/s | 5.1 |
| 1990 | 29.1°C | 22.7°C | 16.4°C | 35.3°C | 10.9°C | 73 mm | 55% | 2.5 m/s | 5.2 |
| 1989 | 27.3°C | 19.9°C | 12.5°C | 34.7°C | 2.6°C | 66 mm | 55% | 3.3 m/s | 5.3 |
| 1988 | 28.3°C | 20.9°C | 13.4°C | 34.7°C | 8.4°C | 87 mm | 56% | 3.3 m/s | 5 |
| 1987 | 27.3°C | 20.6°C | 14.0°C | 32.4°C | 9.9°C | 89 mm | 62% | 2.7 m/s | 5.4 |
| 1986 | 27.2°C | 21.1°C | 14.9°C | 31.8°C | 9.9°C | 87 mm | 68% | 3.6 m/s | 5.2 |
| 1985 🌧️ | 27.2°C | 20.8°C | 14.4°C | 36.0°C | -1.5°C | 149 mm | 59% | 3.7 m/s | 5.1 |
| 1984 | 28.5°C | 20.9°C | 13.3°C | 37.9°C | 0.6°C | 20 mm | 47% | 3.6 m/s | 5.2 |
| 1983 | 30.9°C | 23.9°C | 17.0°C | 39.1°C | 3.3°C | 26 mm | 47% | 3.7 m/s | — |
| 1982 | 30.4°C | 23.4°C | 16.5°C | 36.6°C | 10.5°C | 32 mm | 49% | 3.4 m/s | — |
| 1981 | 27.7°C | 21.2°C | 14.7°C | 33.5°C | 8.7°C | 81 mm | 61% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.5°C with lows near 15.3°C (mean 22.4°C), based on 45 years of NASA POWER data.
September averages 51 mm of rainfall in Amarillo, about average for rainfall. The wettest on record was 149 mm in 1985.
The hottest September reached 40.8°C in 2023. The coldest dipped to -1.5°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.6°C. Daytime highs moved from 28.9°C to 32.2°C and overnight lows from 15.2°C to 17.1°C over the same span.
September is one of the warmer months of the year in Amarillo and about average for rainfall, so plan for around 29.5°C daytime highs and 15.3°C at night.
Not quite — September is the 9th coolest month in Amarillo, averaging 22.4°C.
For September in Amarillo, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 15.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 53% — relatively dry.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 3.8 m/s (2019).
The wettest September on record was 1985 with 149 mm. On average, September sees 51 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 Amarillo 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.
