September is one of the warmer months of the year in Oxnard, with average highs near 22.3°C and lows around 18.7°C (mean 20.5°C). It is one of the drier months, averaging 5 mm of rainfall and 73% relative humidity across the period.
September is one of the warmer months of the year in Oxnard. Across 45 years of records, the warmest September in Oxnard was 1984 — when the month averaged 23.9°C — while the coldest was 1999 at 17.9°C. Typical September days reach 22.3°C with nights near 18.7°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Oxnard, averaging 5 mm of rainfall. The wettest September on record was 1983 with 68 mm, while the driest were 2018, 2020 and 2024, among others at 0 mm.
Relative humidity in Oxnard during September averages 73%. The most humid September was 2025 at 83%, and the least humid was 1989 at 65%.
September receives about 5.9 kWh/m²/day of solar energy in Oxnard. The sunniest September was 2004 at 6.4 kWh/m²/day, and the cloudiest was 1984 at 5.1.
Average wind speed in Oxnard during September is 2.3 m/s. The windiest September was 1986 at 3 m/s, while the calmest was 1991 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.8°C | 20.4°C | 20.0°C | 20.7°C | 20.8°C | 0°C |
| Avg High | 22.7°C | 22.2°C | 21.8°C | 22.5°C | 22.4°C | -0.3°C |
| Avg Low | 18.8°C | 18.6°C | 18.2°C | 19.0°C | 19.2°C | +0.4°C |
| Avg Rain | 17 mm | 2 mm | 3 mm | 2 mm | 4 mm | -13 mm |
September temperatures in Oxnard have fallen by about 0.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 14.2°C (1999) to a record high of 33.2°C (1987).
Rainfall in September is one of the drier months, averaging 5 mm, with a wettest year of 68 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
One of the best times to visit Oxnard
September is one of the best times to visit Oxnard. Expect days averaging 22.3°C and nights around 18.7°C (mean 20.5°C) — warmer than Oxnard's yearly average — with low rainfall (5 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 | 22.2°C | 20.8°C | 19.4°C | 24.9°C | 17.9°C | 9 mm | 83% | 2.4 m/s | 5.4 |
| 2024 | 21.8°C | 20.2°C | 18.5°C | 30.9°C | 16.0°C | 0 mm | 75% | 2.7 m/s | 6 |
| 2023 | 21.4°C | 20.0°C | 18.6°C | 25.2°C | 16.9°C | 2 mm | 82% | 2.9 m/s | 5.7 |
| 2022 | 24.3°C | 22.6°C | 21.0°C | 32.6°C | 17.4°C | 11 mm | 73% | 2.4 m/s | 5.8 |
| 2021 | 20.8°C | 19.1°C | 17.5°C | 27.2°C | 15.0°C | 1 mm | 79% | 2.1 m/s | 5.9 |
| 2020 | 23.7°C | 21.9°C | 20.0°C | 33.2°C | 16.9°C | 0 mm | 72% | 2.2 m/s | 5.5 |
| 2019 | 23.0°C | 21.3°C | 19.7°C | 26.0°C | 16.6°C | 0 mm | 74% | 2.7 m/s | 6.2 |
| 2018 | 20.9°C | 19.4°C | 17.9°C | 24.3°C | 15.5°C | 0 mm | 80% | 2.2 m/s | 6.1 |
| 2017 | 22.7°C | 21.1°C | 19.4°C | 30.8°C | 16.9°C | 4 mm | 75% | 2.6 m/s | 6 |
| 2016 | 22.6°C | 20.7°C | 18.8°C | 32.8°C | 16.6°C | 0 mm | 72% | 2.5 m/s | 6.1 |
| 2015 | 24.9°C | 23.2°C | 21.5°C | 29.9°C | 18.5°C | 15 mm | 74% | 2 m/s | 6 |
| 2014 | 23.6°C | 22.0°C | 20.4°C | 31.5°C | 17.7°C | 0 mm | 73% | 2.7 m/s | 6.2 |
| 2013 | 22.6°C | 20.7°C | 18.8°C | 26.8°C | 15.9°C | 0 mm | 70% | 2.6 m/s | 6.3 |
| 2012 | 22.8°C | 21.2°C | 19.7°C | 28.5°C | 17.2°C | 1 mm | 71% | 2.1 m/s | 6 |
| 2011 | 20.3°C | 18.6°C | 16.9°C | 29.6°C | 14.4°C | 1 mm | 79% | 2 m/s | 5.7 |
| 2010 | 21.1°C | 19.1°C | 17.1°C | 33.2°C | 14.7°C | 0 mm | 71% | 2.2 m/s | 6.2 |
| 2009 | 23.3°C | 21.3°C | 19.3°C | 32.5°C | 16.3°C | 0 mm | 71% | 1.9 m/s | 6.1 |
| 2008 | 21.6°C | 20.1°C | 18.5°C | 26.5°C | 16.2°C | 0 mm | 76% | 2.2 m/s | 6 |
| 2007 | 21.3°C | 19.5°C | 17.7°C | 29.7°C | 14.9°C | 8 mm | 73% | 2.5 m/s | 6.3 |
| 2006 | 21.5°C | 19.8°C | 18.2°C | 27.1°C | 16.2°C | 1 mm | 72% | 2.4 m/s | 6.2 |
| 2005 | 20.8°C | 19.0°C | 17.2°C | 30.8°C | 15.2°C | 5 mm | 74% | 2.2 m/s | 6.3 |
| 2004 | 23.2°C | 21.3°C | 19.3°C | 29.9°C | 16.4°C | 0 mm | 69% | 2.3 m/s | 6.4 |
| 2003 | 20.7°C | 19.1°C | 17.5°C | 23.8°C | 15.7°C | 1 mm | 79% | 2 m/s | 6 |
| 2002 | 22.0°C | 20.0°C | 17.9°C | 27.6°C | 15.3°C | 2 mm | 69% | 2.2 m/s | 5.8 |
| 2001 | 21.1°C | 19.5°C | 17.8°C | 26.8°C | 15.4°C | 0 mm | 76% | 2.2 m/s | 6 |
| 2000 | 22.1°C | 20.2°C | 18.3°C | 27.5°C | 16.1°C | 11 mm | 73% | 2.3 m/s | 6 |
| 1999 ❄️ | 19.7°C | 17.9°C | 16.1°C | 31.7°C | 14.2°C | 3 mm | 79% | 2.1 m/s | 5.9 |
| 1998 | 21.8°C | 20.2°C | 18.7°C | 28.0°C | 17.3°C | 8 mm | 78% | 2.7 m/s | 5.5 |
| 1997 | 24.8°C | 23.0°C | 21.1°C | 30.1°C | 18.9°C | 2 mm | 70% | 2.2 m/s | 6 |
| 1996 | 21.5°C | 19.8°C | 18.1°C | 24.0°C | 16.3°C | 0 mm | 76% | 2.3 m/s | 6.2 |
| 1995 | 22.6°C | 20.8°C | 18.9°C | 27.3°C | 16.6°C | 0 mm | 68% | 2.3 m/s | 6.2 |
| 1994 | 21.7°C | 20.0°C | 18.3°C | 25.2°C | 16.4°C | 5 mm | 73% | 2.5 m/s | 5.8 |
| 1993 | 22.1°C | 20.2°C | 18.3°C | 29.6°C | 15.2°C | 0 mm | 69% | 2.2 m/s | 6.1 |
| 1992 | 23.0°C | 21.2°C | 19.4°C | 28.3°C | 16.5°C | 0 mm | 69% | 2.1 m/s | 6.1 |
| 1991 | 20.8°C | 19.2°C | 17.6°C | 25.9°C | 15.5°C | 1 mm | 76% | 1.7 m/s | 5.7 |
| 1990 | 23.6°C | 21.6°C | 19.6°C | 28.9°C | 17.5°C | 2 mm | 66% | 2.4 m/s | 6.1 |
| 1989 | 22.9°C | 20.5°C | 18.2°C | 29.5°C | 15.8°C | 4 mm | 65% | 2.5 m/s | 5.9 |
| 1988 | 22.4°C | 20.2°C | 18.0°C | 30.8°C | 15.5°C | 1 mm | 69% | 2 m/s | 5.7 |
| 1987 | 22.9°C | 21.0°C | 19.0°C | 33.2°C | 16.5°C | 1 mm | 70% | 2.2 m/s | 5.6 |
| 1986 | 20.4°C | 18.6°C | 16.7°C | 23.8°C | 14.8°C | 31 mm | 72% | 3 m/s | 5.6 |
| 1985 | 21.7°C | 19.9°C | 18.0°C | 26.2°C | 15.7°C | 2 mm | 70% | 2.7 m/s | 5.6 |
| 1984 🔥 | 25.9°C | 23.9°C | 21.9°C | 30.8°C | 18.3°C | 11 mm | 67% | 2.2 m/s | 5.1 |
| 1983 🌧️ | 23.3°C | 21.7°C | 20.1°C | 29.1°C | 17.4°C | 68 mm | 72% | 2.3 m/s | — |
| 1982 | 22.8°C | 21.0°C | 19.1°C | 31.5°C | 15.8°C | 29 mm | 68% | 2.6 m/s | — |
| 1981 | 22.2°C | 20.1°C | 18.1°C | 27.0°C | 15.0°C | 5 mm | 68% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.3°C with lows near 18.7°C (mean 20.5°C), based on 45 years of NASA POWER data.
September averages 5 mm of rainfall in Oxnard, one of the drier months. The wettest on record was 68 mm in 1983.
The hottest September reached 33.2°C in 1987. The coldest dipped to 14.2°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have fallen by about 0.8°C. Daytime highs moved from 23.2°C to 22.1°C and overnight lows from 19.4°C to 19°C over the same span.
September is one of the warmer months of the year in Oxnard and one of the drier months, so plan for around 22.3°C daytime highs and 18.7°C at night.
Not quite — September is the 12th coolest month in Oxnard, averaging 20.5°C.
For September in Oxnard, pack light layers you can adjust through the day, with typical highs of 22.3°C and lows of 18.7°C.
Relative humidity in September averages 73% — moderately humid.
Average wind speed in September is 2.3 m/s. The windiest September on record averaged 3 m/s (1986).
The wettest September on record was 1983 with 68 mm. On average, September sees 5 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 Oxnard 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.
