September is one of the warmer months of the year in Owasso, with average highs near 29.5°C and lows around 17°C (mean 23.3°C). It is a relatively wet time of year, averaging 104 mm of rainfall and 66% relative humidity across the period.
September is one of the warmer months of the year in Owasso. Across 45 years of records, the warmest September in Owasso was 1998 — when the month averaged 27.3°C — while the coldest were 1989 and 1993 at 19.8°C. Typical September days reach 29.5°C with nights near 17°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Owasso, averaging 104 mm of rainfall. The wettest September on record was 1986 with 359 mm, while the driest was 2024 at 23 mm.
Relative humidity in Owasso during September averages 66%. The most humid September was 2008 at 81%, and the least humid was 2000 at 46%.
September receives about 4.9 kWh/m²/day of solar energy in Owasso. The sunniest September was 2004 at 5.7 kWh/m²/day, and the cloudiest was 1986 at 4.
Average wind speed in Owasso during September is 2.6 m/s. The windiest September was 1984 at 3.4 m/s, while the calmest was 2025 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.8°C | 22.4°C | 22.8°C | 23.9°C | 24.7°C | +1.9°C |
| Avg High | 29.1°C | 28.4°C | 29.1°C | 30.0°C | 31.4°C | +2.3°C |
| Avg Low | 16.6°C | 16.3°C | 16.5°C | 17.9°C | 17.9°C | +1.3°C |
| Avg Rain | 120 mm | 145 mm | 93 mm | 88 mm | 55 mm | -65 mm |
September temperatures in Owasso have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2.1°C (1995) to a record high of 43.4°C (2000).
Rainfall in September is a relatively wet time of year, averaging 104 mm, with a wettest year of 359 mm.
One of the best times to visit Owasso
September is one of the best times to visit Owasso. Expect days averaging 29.5°C and nights around 17°C (mean 23.3°C) — warmer than Owasso's yearly average — with higher rainfall (104 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 | 23.6°C | 17.8°C | 34.7°C | 12.6°C | 73 mm | 72% | 1.8 m/s | 4.8 |
| 2024 | 32.1°C | 24.9°C | 17.7°C | 38.0°C | 11.6°C | 23 mm | 56% | 2.3 m/s | 5.3 |
| 2023 | 32.5°C | 25.5°C | 18.5°C | 37.7°C | 14.9°C | 85 mm | 61% | 2.4 m/s | 5.2 |
| 2022 | 32.9°C | 25.5°C | 18.0°C | 39.1°C | 11.8°C | 30 mm | 52% | 2.5 m/s | 5.6 |
| 2021 | 33.2°C | 26.2°C | 19.2°C | 37.7°C | 11.0°C | 37 mm | 57% | 2.8 m/s | 5.4 |
| 2020 | 28.3°C | 22.3°C | 16.2°C | 35.4°C | 7.6°C | 82 mm | 73% | 2.4 m/s | 4.6 |
| 2019 | 30.4°C | 25.7°C | 21.1°C | 33.6°C | 16.5°C | 127 mm | 79% | 2.6 m/s | 5.1 |
| 2018 | 29.6°C | 24.1°C | 18.7°C | 36.1°C | 8.8°C | 68 mm | 74% | 2.5 m/s | 4.3 |
| 2017 | 30.5°C | 24.0°C | 17.6°C | 35.8°C | 10.7°C | 47 mm | 64% | 2.5 m/s | 5.1 |
| 2016 | 30.7°C | 24.7°C | 18.6°C | 35.7°C | 9.8°C | 77 mm | 68% | 2.6 m/s | 5.4 |
| 2015 | 29.6°C | 23.9°C | 18.2°C | 35.5°C | 10.7°C | 62 mm | 72% | 2.5 m/s | 5.2 |
| 2014 | 29.6°C | 23.5°C | 17.5°C | 35.9°C | 8.4°C | 97 mm | 68% | 2.8 m/s | 4.8 |
| 2013 | 31.1°C | 24.3°C | 17.5°C | 37.9°C | 9.1°C | 67 mm | 63% | 2.5 m/s | 5.3 |
| 2012 | 30.4°C | 23.8°C | 17.2°C | 41.4°C | 10.6°C | 86 mm | 63% | 2.5 m/s | 4.9 |
| 2011 | 29.0°C | 22.1°C | 15.1°C | 40.1°C | 9.2°C | 83 mm | 54% | 2.7 m/s | 5.3 |
| 2010 | 29.0°C | 23.4°C | 17.9°C | 35.4°C | 8.3°C | 162 mm | 72% | 2.9 m/s | 5.1 |
| 2009 | 25.7°C | 20.6°C | 15.6°C | 30.4°C | 6.7°C | 208 mm | 79% | 2.4 m/s | 4.3 |
| 2008 | 25.8°C | 20.6°C | 15.5°C | 31.5°C | 9.2°C | 146 mm | 81% | 2.4 m/s | 4.7 |
| 2007 | 28.3°C | 23.0°C | 17.8°C | 32.7°C | 11.9°C | 133 mm | 76% | 2.5 m/s | 4.6 |
| 2006 | 28.1°C | 21.5°C | 14.8°C | 34.0°C | 8.9°C | 77 mm | 62% | 2.5 m/s | 5.1 |
| 2005 | 32.5°C | 25.8°C | 19.1°C | 36.7°C | 8.2°C | 65 mm | 64% | 2.6 m/s | 5.3 |
| 2004 | 31.2°C | 23.9°C | 16.7°C | 35.4°C | 12.0°C | 23 mm | 57% | 2.7 m/s | 5.7 |
| 2003 | 25.6°C | 20.0°C | 14.4°C | 29.9°C | 7.6°C | 80 mm | 74% | 2.6 m/s | 4.7 |
| 2002 | 31.8°C | 24.7°C | 17.6°C | 37.1°C | 10.0°C | 57 mm | 58% | 2.4 m/s | 5.3 |
| 2001 | 29.5°C | 22.7°C | 15.9°C | 36.5°C | 6.5°C | 79 mm | 62% | 2.4 m/s | 5.1 |
| 2000 | 32.8°C | 25.1°C | 17.4°C | 43.4°C | 5.7°C | 61 mm | 46% | 2.9 m/s | 5.4 |
| 1999 | 27.2°C | 21.0°C | 14.8°C | 36.7°C | 6.9°C | 136 mm | 65% | 2.6 m/s | 4.5 |
| 1998 🔥 | 33.2°C | 27.3°C | 21.3°C | 42.9°C | 16.2°C | 162 mm | 61% | 2.7 m/s | 5.1 |
| 1997 | 29.3°C | 23.0°C | 16.8°C | 35.8°C | 11.5°C | 117 mm | 69% | 2.7 m/s | 4.9 |
| 1996 | 27.6°C | 21.4°C | 15.2°C | 34.8°C | 5.3°C | 205 mm | 68% | 2.3 m/s | 4.4 |
| 1995 | 27.3°C | 21.4°C | 15.5°C | 38.1°C | 2.1°C | 93 mm | 67% | 2.6 m/s | 4.1 |
| 1994 | 27.8°C | 21.6°C | 15.4°C | 32.9°C | 8.0°C | 71 mm | 68% | 2.5 m/s | 4.8 |
| 1993 | 25.9°C | 19.8°C | 13.8°C | 32.3°C | 5.2°C | 253 mm | 75% | 2.8 m/s | 4.7 |
| 1992 | 27.2°C | 21.3°C | 15.4°C | 32.7°C | 5.3°C | 141 mm | 74% | 2.9 m/s | 4.9 |
| 1991 | 27.1°C | 21.6°C | 16.1°C | 35.1°C | 6.0°C | 127 mm | 70% | 2.6 m/s | 4.5 |
| 1990 | 31.7°C | 25.3°C | 18.9°C | 40.7°C | 6.7°C | 146 mm | 60% | 2.3 m/s | 4.8 |
| 1989 ❄️ | 25.7°C | 19.8°C | 14.0°C | 34.1°C | 2.3°C | 97 mm | 71% | 2.6 m/s | 4.4 |
| 1988 | 29.9°C | 23.2°C | 16.4°C | 38.1°C | 11.2°C | 179 mm | 63% | 2.5 m/s | 4.8 |
| 1987 | 28.1°C | 22.0°C | 15.9°C | 34.1°C | 8.3°C | 101 mm | 69% | 2.1 m/s | 4.9 |
| 1986 🌧️ | 28.3°C | 23.8°C | 19.4°C | 31.8°C | 11.7°C | 359 mm | 78% | 3.3 m/s | 4 |
| 1985 | 28.7°C | 22.9°C | 17.1°C | 39.7°C | 4.5°C | 136 mm | 66% | 3.2 m/s | 4.8 |
| 1984 | 29.0°C | 22.5°C | 15.9°C | 37.0°C | 2.3°C | 70 mm | 57% | 3.4 m/s | 4.6 |
| 1983 | 31.5°C | 24.6°C | 17.6°C | 38.8°C | 4.3°C | 51 mm | 54% | 3.2 m/s | — |
| 1982 | 30.5°C | 23.7°C | 17.0°C | 37.7°C | 7.0°C | 47 mm | 58% | 2.9 m/s | — |
| 1981 | 29.8°C | 23.1°C | 16.4°C | 34.2°C | 7.4°C | 42 mm | 63% | 2.8 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 17°C (mean 23.3°C), based on 45 years of NASA POWER data.
September averages 104 mm of rainfall in Owasso, a relatively wet time of year. The wettest on record was 359 mm in 1986.
The hottest September reached 43.4°C in 2000. The coldest dipped to 2.1°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 29.9°C to 32°C and overnight lows from 16.8°C to 18.2°C over the same span.
September is one of the warmer months of the year in Owasso and a relatively wet time of year, so plan for around 29.5°C daytime highs and 17°C at night.
Not quite — September is the 9th coolest month in Owasso, averaging 23.3°C.
For September in Owasso, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 17°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 66% — moderately humid.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 3.4 m/s (1984).
The wettest September on record was 1986 with 359 mm. On average, September sees 104 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 Owasso 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.
