September is one of the warmer months of the year in Van Nuys, with average highs near 26.5°C and lows around 18.2°C (mean 22.4°C). It is one of the drier months, averaging 6 mm of rainfall and 61% relative humidity across the period.
September is one of the warmer months of the year in Van Nuys. Across 45 years of records, the warmest September in Van Nuys was 1984 — when the month averaged 25.8°C — while the coldest was 1986 at 19.3°C. Typical September days reach 26.5°C with nights near 18.2°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Van Nuys, averaging 6 mm of rainfall. The wettest September on record was 1983 with 60 mm, while the driest were 2013, 2018 and 2020, among others at 0 mm.
Relative humidity in Van Nuys during September averages 61%. The most humid September was 2023 at 77%, and the least humid was 1989 at 52%.
September receives about 6.1 kWh/m²/day of solar energy in Van Nuys. The sunniest Septembers were 2003 and 2018 at 6.5 kWh/m²/day, and the cloudiest was 1984 at 5.4.
Average wind speed in Van Nuys during September is 2 m/s. The windiest September was 1986 at 2.5 m/s, while the calmest were 1991 and 2011 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.3°C | 22.2°C | 22.1°C | 22.6°C | 22.7°C | +0.4°C |
| Avg High | 26.5°C | 26.3°C | 26.5°C | 26.7°C | 26.7°C | +0.2°C |
| Avg Low | 18.1°C | 18.1°C | 17.8°C | 18.4°C | 18.7°C | +0.6°C |
| Avg Rain | 16 mm | 2 mm | 3 mm | 4 mm | 5 mm | -11 mm |
September temperatures in Van Nuys have fallen by about 0.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 11.7°C (1986) to a record high of 39.5°C (2020).
Rainfall in September is one of the drier months, averaging 6 mm, with a wettest year of 60 mm.
One of the best times to visit Van Nuys
September is one of the best times to visit Van Nuys. Expect days averaging 26.5°C and nights around 18.2°C (mean 22.4°C) — warmer than Van Nuys's yearly average — with low rainfall (6 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 | 25.8°C | 22.2°C | 18.7°C | 30.7°C | 17.4°C | 13 mm | 73% | 2 m/s | 5.8 |
| 2024 | 26.4°C | 22.3°C | 18.2°C | 38.0°C | 15.2°C | 0 mm | 63% | 2.1 m/s | 6.1 |
| 2023 | 24.2°C | 21.0°C | 17.7°C | 31.1°C | 14.8°C | 3 mm | 77% | 2.3 m/s | 5.6 |
| 2022 | 28.5°C | 24.6°C | 20.6°C | 36.1°C | 16.3°C | 14 mm | 64% | 2 m/s | 5.9 |
| 2021 | 25.7°C | 21.5°C | 17.3°C | 32.1°C | 13.9°C | 2 mm | 64% | 1.9 m/s | 6.2 |
| 2020 | 29.4°C | 24.6°C | 19.8°C | 39.5°C | 15.5°C | 0 mm | 53% | 1.8 m/s | 6.1 |
| 2019 | 27.1°C | 23.0°C | 18.9°C | 32.5°C | 13.7°C | 1 mm | 61% | 2.1 m/s | 6.2 |
| 2018 | 25.1°C | 21.0°C | 16.9°C | 30.5°C | 14.8°C | 0 mm | 68% | 1.9 m/s | 6.5 |
| 2017 | 26.4°C | 22.4°C | 18.3°C | 35.4°C | 14.2°C | 6 mm | 64% | 2.2 m/s | 6.1 |
| 2016 | 26.1°C | 22.0°C | 17.8°C | 35.0°C | 14.9°C | 0 mm | 61% | 2.1 m/s | 6.3 |
| 2015 | 28.1°C | 24.2°C | 20.4°C | 33.5°C | 16.8°C | 24 mm | 65% | 1.8 m/s | 6.1 |
| 2014 | 27.9°C | 23.8°C | 19.8°C | 35.1°C | 16.3°C | 1 mm | 61% | 2 m/s | 6.3 |
| 2013 | 26.9°C | 22.5°C | 18.1°C | 31.7°C | 14.2°C | 0 mm | 56% | 2.1 m/s | 6.4 |
| 2012 | 28.4°C | 24.2°C | 19.9°C | 33.3°C | 16.0°C | 1 mm | 54% | 1.8 m/s | 6.1 |
| 2011 | 25.2°C | 21.0°C | 16.8°C | 32.5°C | 14.1°C | 2 mm | 63% | 1.7 m/s | 6.1 |
| 2010 | 26.1°C | 21.5°C | 16.8°C | 37.1°C | 13.5°C | 0 mm | 56% | 1.9 m/s | 6.4 |
| 2009 | 27.7°C | 23.2°C | 18.8°C | 34.0°C | 13.6°C | 0 mm | 59% | 1.8 m/s | 6.3 |
| 2008 | 27.0°C | 22.7°C | 18.4°C | 32.5°C | 15.2°C | 0 mm | 61% | 2 m/s | 6.3 |
| 2007 | 25.0°C | 21.1°C | 17.2°C | 35.1°C | 13.4°C | 14 mm | 62% | 2.1 m/s | 6.3 |
| 2006 | 26.5°C | 22.2°C | 17.9°C | 32.6°C | 13.9°C | 0 mm | 56% | 2 m/s | 6.3 |
| 2005 | 24.7°C | 20.5°C | 16.3°C | 33.1°C | 13.2°C | 5 mm | 64% | 1.9 m/s | 6.3 |
| 2004 | 27.4°C | 22.9°C | 18.4°C | 32.9°C | 14.8°C | 0 mm | 58% | 2.1 m/s | 6.4 |
| 2003 | 26.9°C | 22.2°C | 17.4°C | 33.8°C | 15.6°C | 0 mm | 62% | 1.8 m/s | 6.5 |
| 2002 | 27.3°C | 22.7°C | 18.0°C | 34.2°C | 14.5°C | 2 mm | 55% | 2 m/s | 6.1 |
| 2001 | 25.7°C | 21.5°C | 17.3°C | 31.6°C | 14.6°C | 0 mm | 64% | 2 m/s | 6.4 |
| 2000 | 26.6°C | 22.2°C | 17.8°C | 34.1°C | 15.8°C | 8 mm | 60% | 2.1 m/s | 6.1 |
| 1999 | 24.1°C | 20.0°C | 16.0°C | 34.1°C | 13.3°C | 2 mm | 67% | 2 m/s | 6.3 |
| 1998 | 24.9°C | 21.5°C | 18.0°C | 34.5°C | 15.5°C | 9 mm | 69% | 2.2 m/s | 5.6 |
| 1997 | 28.6°C | 24.5°C | 20.5°C | 33.0°C | 16.8°C | 6 mm | 56% | 1.9 m/s | 6 |
| 1996 | 25.1°C | 21.2°C | 17.2°C | 29.9°C | 14.9°C | 0 mm | 65% | 2 m/s | 6.3 |
| 1995 | 27.1°C | 22.8°C | 18.5°C | 32.5°C | 14.3°C | 0 mm | 56% | 2 m/s | 6.3 |
| 1994 | 26.1°C | 22.1°C | 18.1°C | 29.9°C | 15.3°C | 2 mm | 58% | 2 m/s | 5.9 |
| 1993 | 26.3°C | 21.8°C | 17.3°C | 33.0°C | 13.7°C | 0 mm | 56% | 2 m/s | 6.3 |
| 1992 | 27.6°C | 23.2°C | 18.9°C | 33.1°C | 15.7°C | 0 mm | 55% | 1.9 m/s | 6.2 |
| 1991 | 25.5°C | 21.5°C | 17.5°C | 31.3°C | 13.9°C | 2 mm | 64% | 1.7 m/s | 6.1 |
| 1990 | 27.5°C | 23.2°C | 18.9°C | 33.1°C | 16.1°C | 1 mm | 54% | 2 m/s | 6.2 |
| 1989 | 26.9°C | 22.3°C | 17.8°C | 32.0°C | 14.4°C | 8 mm | 52% | 2.1 m/s | 6.1 |
| 1988 | 26.7°C | 22.1°C | 17.5°C | 35.9°C | 14.0°C | 2 mm | 59% | 2 m/s | 5.9 |
| 1987 | 27.0°C | 22.6°C | 18.2°C | 35.5°C | 15.1°C | 1 mm | 58% | 2 m/s | 5.8 |
| 1986 ❄️ | 23.4°C | 19.3°C | 15.2°C | 30.8°C | 11.7°C | 32 mm | 63% | 2.5 m/s | 5.8 |
| 1985 | 24.7°C | 20.7°C | 16.8°C | 30.4°C | 14.1°C | 3 mm | 61% | 2.3 m/s | 5.6 |
| 1984 🔥 | 30.0°C | 25.8°C | 21.7°C | 35.4°C | 17.2°C | 7 mm | 55% | 2.1 m/s | 5.4 |
| 1983 🌧️ | 27.3°C | 23.5°C | 19.8°C | 33.3°C | 15.9°C | 60 mm | 60% | 2.1 m/s | — |
| 1982 | 26.0°C | 22.0°C | 18.0°C | 35.6°C | 12.3°C | 27 mm | 58% | 2.2 m/s | — |
| 1981 | 26.6°C | 22.2°C | 17.8°C | 32.7°C | 14.2°C | 6 mm | 53% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 26.5°C with lows near 18.2°C (mean 22.4°C), based on 45 years of NASA POWER data.
September averages 6 mm of rainfall in Van Nuys, one of the drier months. The wettest on record was 60 mm in 1983.
The hottest September reached 39.5°C in 2020. The coldest dipped to 11.7°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have fallen by about 0.5°C. Daytime highs moved from 26.9°C to 26.1°C and overnight lows from 18.8°C to 18.5°C over the same span.
September is one of the warmer months of the year in Van Nuys and one of the drier months, so plan for around 26.5°C daytime highs and 18.2°C at night.
Not quite — September is the 11th coolest month in Van Nuys, averaging 22.4°C.
For September in Van Nuys, pack light layers you can adjust through the day, with typical highs of 26.5°C and lows of 18.2°C.
Relative humidity in September averages 61% — moderately humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.5 m/s (1986).
The wettest September on record was 1983 with 60 mm. On average, September sees 6 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 Van Nuys 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.
