September is one of the warmer months of the year in Yuma, with average highs near 38.5°C and lows around 23.3°C (mean 30.9°C). It is about average for rainfall, averaging 13 mm of rainfall and 34% relative humidity across the period.
September is one of the warmer months of the year in Yuma. Across 45 years of records, the warmest September in Yuma was 2020 — when the month averaged 33.2°C — while the coldest was 1986 at 26.8°C. Typical September days reach 38.5°C with nights near 23.3°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Yuma, averaging 13 mm of rainfall. The wettest September on record was 1997 with 66 mm, while the driest were 1989, 2000 and 2020 at 0 mm.
Relative humidity in Yuma during September averages 34%. The most humid September was 1983 at 47%, and the least humid was 2020 at 23%.
September receives about 6.2 kWh/m²/day of solar energy in Yuma. The sunniest Septembers were 1989 and 1993 at 6.6 kWh/m²/day, and the cloudiest was 2022 at 5.7.
Average wind speed in Yuma during September is 2.3 m/s. The windiest Septembers were 2004, 2016 and 2017, among others at 2.6 m/s, while the calmest was 2008 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.7°C | 30.8°C | 31.1°C | 31.3°C | 31.8°C | +2.1°C |
| Avg High | 37.4°C | 38.2°C | 39.0°C | 38.7°C | 39.3°C | +1.9°C |
| Avg Low | 22.0°C | 23.3°C | 23.2°C | 23.9°C | 24.4°C | +2.4°C |
| Avg Rain | 14 mm | 18 mm | 10 mm | 11 mm | 14 mm | 0 mm |
September temperatures in Yuma have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 11.2°C (1986) to a record high of 47.8°C (2024).
Rainfall in September is about average for rainfall, averaging 13 mm, with a wettest year of 66 mm.
A quieter season to visit Yuma
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Yuma. That said, September — with days averaging 38.5°C and nights around 23.3°C (mean 30.9°C) and low rainfall (13 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 37.0°C | 30.5°C | 24.1°C | 41.2°C | 18.9°C | 41 mm | 44% | 2 m/s | 5.9 |
| 2024 | 40.9°C | 32.7°C | 24.5°C | 47.8°C | 16.1°C | 1 mm | 27% | 2.1 m/s | 6.5 |
| 2023 | 37.6°C | 29.7°C | 21.9°C | 44.5°C | 16.7°C | 30 mm | 38% | 2.1 m/s | 6.2 |
| 2022 | 38.9°C | 32.2°C | 25.6°C | 45.0°C | 19.6°C | 8 mm | 40% | 2.4 m/s | 5.7 |
| 2021 | 39.8°C | 32.6°C | 25.4°C | 44.9°C | 18.3°C | 2 mm | 32% | 2.1 m/s | 6.1 |
| 2020 🔥 | 41.4°C | 33.2°C | 25.0°C | 47.7°C | 19.4°C | 0 mm | 23% | 2.1 m/s | 6.3 |
| 2019 | 37.9°C | 30.8°C | 23.6°C | 44.7°C | 12.8°C | 13 mm | 36% | 2.4 m/s | 6.3 |
| 2018 | 40.8°C | 33.0°C | 25.1°C | 45.7°C | 21.3°C | 1 mm | 30% | 2.1 m/s | 6.4 |
| 2017 | 36.8°C | 29.4°C | 22.0°C | 44.4°C | 14.7°C | 13 mm | 35% | 2.6 m/s | 6.2 |
| 2016 | 37.1°C | 29.4°C | 21.7°C | 42.3°C | 15.7°C | 6 mm | 33% | 2.6 m/s | 6 |
| 2015 | 39.3°C | 32.6°C | 25.9°C | 42.8°C | 21.0°C | 9 mm | 38% | 2.2 m/s | 5.8 |
| 2014 | 38.9°C | 31.9°C | 24.9°C | 43.2°C | 16.0°C | 18 mm | 38% | 2.4 m/s | 6.2 |
| 2013 | 37.5°C | 30.3°C | 23.0°C | 43.3°C | 14.8°C | 23 mm | 34% | 2 m/s | 6.4 |
| 2012 | 38.6°C | 31.9°C | 25.1°C | 43.2°C | 20.0°C | 17 mm | 37% | 2.2 m/s | 5.9 |
| 2011 | 40.1°C | 32.3°C | 24.5°C | 45.1°C | 19.7°C | 9 mm | 30% | 2.1 m/s | 6.1 |
| 2010 | 40.3°C | 31.8°C | 23.3°C | 45.9°C | 17.2°C | 2 mm | 24% | 2.1 m/s | 6.5 |
| 2009 | 39.7°C | 31.9°C | 24.2°C | 43.3°C | 19.4°C | 8 mm | 28% | 2.4 m/s | 6.4 |
| 2008 | 39.7°C | 32.1°C | 24.5°C | 44.1°C | 18.4°C | 6 mm | 31% | 1.9 m/s | 6.3 |
| 2007 | 37.5°C | 30.0°C | 22.4°C | 46.0°C | 15.0°C | 12 mm | 34% | 2.4 m/s | 6.3 |
| 2006 | 37.3°C | 30.0°C | 22.6°C | 43.4°C | 15.4°C | 20 mm | 32% | 2.3 m/s | 6.4 |
| 2005 | 38.4°C | 30.2°C | 22.1°C | 42.5°C | 15.6°C | 1 mm | 26% | 2.4 m/s | 6.5 |
| 2004 | 38.3°C | 30.1°C | 21.9°C | 44.1°C | 15.2°C | 5 mm | 33% | 2.6 m/s | 6.5 |
| 2003 | 39.9°C | 32.1°C | 24.3°C | 45.0°C | 19.5°C | 20 mm | 35% | 2.2 m/s | 6.3 |
| 2002 | 39.1°C | 31.3°C | 23.5°C | 45.4°C | 15.4°C | 23 mm | 32% | 2.1 m/s | 6.3 |
| 2001 | 40.7°C | 32.5°C | 24.4°C | 42.7°C | 19.1°C | 1 mm | 28% | 2.5 m/s | 6.4 |
| 2000 | 39.4°C | 31.0°C | 22.5°C | 44.9°C | 16.9°C | 0 mm | 29% | 2.3 m/s | 6.4 |
| 1999 | 39.0°C | 31.1°C | 23.3°C | 42.9°C | 18.0°C | 13 mm | 36% | 2.2 m/s | 6.3 |
| 1998 | 37.5°C | 30.0°C | 22.6°C | 43.4°C | 15.5°C | 23 mm | 37% | 2.2 m/s | 6.3 |
| 1997 🌧️ | 37.9°C | 31.5°C | 25.1°C | 43.3°C | 20.8°C | 66 mm | 44% | 2.3 m/s | 5.8 |
| 1996 | 36.9°C | 29.6°C | 22.2°C | 42.5°C | 17.1°C | 12 mm | 39% | 2.2 m/s | 6.1 |
| 1995 | 39.7°C | 32.3°C | 24.9°C | 45.0°C | 15.7°C | 3 mm | 32% | 2.4 m/s | 6.3 |
| 1994 | 38.4°C | 31.2°C | 24.0°C | 43.8°C | 17.4°C | 22 mm | 34% | 2.2 m/s | 5.9 |
| 1993 | 38.4°C | 30.0°C | 21.6°C | 43.4°C | 14.1°C | 3 mm | 29% | 2.1 m/s | 6.6 |
| 1992 | 39.6°C | 31.6°C | 23.6°C | 42.1°C | 18.7°C | 0 mm | 32% | 2.2 m/s | 6.2 |
| 1991 | 37.3°C | 30.3°C | 23.3°C | 42.1°C | 15.3°C | 14 mm | 39% | 2 m/s | 6 |
| 1990 | 37.1°C | 29.9°C | 22.8°C | 45.3°C | 16.3°C | 23 mm | 41% | 2 m/s | 6.3 |
| 1989 | 38.7°C | 30.2°C | 21.8°C | 44.0°C | 14.5°C | 0 mm | 29% | 2.3 m/s | 6.6 |
| 1988 | 37.7°C | 29.3°C | 21.0°C | 42.6°C | 14.5°C | 0 mm | 27% | 2.4 m/s | 6.1 |
| 1987 | 38.0°C | 29.9°C | 21.9°C | 42.6°C | 15.4°C | 7 mm | 30% | 2.1 m/s | 6.1 |
| 1986 ❄️ | 34.6°C | 26.8°C | 19.0°C | 44.9°C | 11.2°C | 14 mm | 30% | 2.4 m/s | 6.2 |
| 1985 | 34.5°C | 26.9°C | 19.2°C | 41.4°C | 14.6°C | 21 mm | 34% | 2.3 m/s | 6.3 |
| 1984 | 38.6°C | 31.4°C | 24.2°C | 42.9°C | 18.0°C | 17 mm | 37% | 2.6 m/s | 6.1 |
| 1983 | 38.1°C | 31.5°C | 24.9°C | 43.5°C | 16.9°C | 47 mm | 47% | 2.1 m/s | — |
| 1982 | 37.1°C | 29.6°C | 22.1°C | 46.3°C | 12.5°C | 12 mm | 36% | 2.4 m/s | — |
| 1981 | 39.5°C | 31.9°C | 24.3°C | 42.3°C | 18.1°C | 5 mm | 30% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 38.5°C with lows near 23.3°C (mean 30.9°C), based on 45 years of NASA POWER data.
September averages 13 mm of rainfall in Yuma, about average for rainfall. The wettest on record was 66 mm in 1997.
The hottest September reached 47.8°C in 2024. The coldest dipped to 11.2°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 37.6°C to 38.8°C and overnight lows from 22.9°C to 24.3°C over the same span.
September is one of the warmer months of the year in Yuma and about average for rainfall, so plan for around 38.5°C daytime highs and 23.3°C at night.
Not quite — September is the 10th coolest month in Yuma, averaging 30.9°C.
For September in Yuma, pack light, breathable clothing and sun protection, with typical highs of 38.5°C and lows of 23.3°C.
Relative humidity in September averages 34% — relatively dry.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 2.6 m/s (1984).
The wettest September on record was 1997 with 66 mm. On average, September sees 13 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 Yuma 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.
