September is one of the warmer months of the year in Sacramento, with average highs near 32.9°C and lows around 15°C (mean 24°C). It is one of the drier months, averaging 9 mm of rainfall and 42% relative humidity across the period.
September is one of the warmer months of the year in Sacramento. Across 45 years of records, the warmest Septembers in Sacramento were 1984, 2020 and 2022 — when the month averaged 26°C — while the coldest was 1986 at 19.9°C. Typical September days reach 32.9°C with nights near 15°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Sacramento, averaging 9 mm of rainfall. The wettest September on record was 1989 with 67 mm, while the driest were 2008, 2018 and 2020, among others at 0 mm.
Relative humidity in Sacramento during September averages 42%. The most humid September was 2023 at 54%, and the least humid was 1984 at 31%.
September receives about 5.9 kWh/m²/day of solar energy in Sacramento. The sunniest Septembers were 2008, 2016 and 2018, among others at 6.2 kWh/m²/day, and the cloudiest was 2020 at 5.3.
Average wind speed in Sacramento during September is 1.9 m/s. The windiest September was 2013 at 2.1 m/s, while the calmest was 1982 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.0°C | 24.1°C | 23.9°C | 24.0°C | 25.0°C | +2°C |
| Avg High | 31.7°C | 33.3°C | 33.0°C | 32.9°C | 33.8°C | +2.1°C |
| Avg Low | 14.3°C | 14.9°C | 14.8°C | 15.1°C | 16.1°C | +1.8°C |
| Avg Rain | 26 mm | 3 mm | 4 mm | 5 mm | 6 mm | -20 mm |
September temperatures in Sacramento have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7.9°C (1986) to a record high of 48.1°C (2022).
Rainfall in September is one of the drier months, averaging 9 mm, with a wettest year of 67 mm.
One of the best times to visit Sacramento
September is one of the best times to visit Sacramento. Expect days averaging 32.9°C and nights around 15°C (mean 24°C) — warmer than Sacramento's yearly average — with low rainfall (9 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 | 33.2°C | 25.0°C | 16.7°C | 41.7°C | 13.5°C | 6 mm | 50% | 1.9 m/s | 5.4 |
| 2024 | 34.7°C | 25.2°C | 15.7°C | 41.8°C | 11.8°C | 1 mm | 41% | 1.9 m/s | 6 |
| 2023 | 31.1°C | 22.8°C | 14.4°C | 36.0°C | 11.6°C | 7 mm | 54% | 2 m/s | 5.8 |
| 2022 | 34.6°C | 26.0°C | 17.5°C | 48.1°C | 13.4°C | 20 mm | 42% | 1.8 m/s | 5.6 |
| 2021 | 34.3°C | 24.8°C | 15.3°C | 43.0°C | 11.7°C | 4 mm | 39% | 1.9 m/s | 6 |
| 2020 | 35.0°C | 26.0°C | 16.9°C | 45.9°C | 13.7°C | 0 mm | 40% | 1.7 m/s | 5.3 |
| 2019 | 31.5°C | 23.3°C | 15.1°C | 38.7°C | 8.3°C | 17 mm | 47% | 2 m/s | 5.9 |
| 2018 | 33.0°C | 23.4°C | 13.7°C | 38.4°C | 9.9°C | 0 mm | 42% | 1.9 m/s | 6.2 |
| 2017 | 32.7°C | 24.8°C | 16.9°C | 44.4°C | 9.4°C | 3 mm | 43% | 1.9 m/s | 5.5 |
| 2016 | 32.7°C | 23.6°C | 14.5°C | 38.8°C | 9.6°C | 0 mm | 41% | 2 m/s | 6.2 |
| 2015 | 32.8°C | 24.5°C | 16.3°C | 41.5°C | 11.6°C | 2 mm | 38% | 1.9 m/s | 5.6 |
| 2014 | 32.8°C | 24.1°C | 15.5°C | 39.5°C | 11.8°C | 13 mm | 51% | 1.9 m/s | 5.9 |
| 2013 | 31.0°C | 22.7°C | 14.4°C | 39.7°C | 9.0°C | 15 mm | 50% | 2.1 m/s | 5.8 |
| 2012 | 34.5°C | 24.2°C | 13.9°C | 38.2°C | 10.8°C | 1 mm | 41% | 2 m/s | 6.1 |
| 2011 | 35.1°C | 25.6°C | 16.0°C | 39.9°C | 12.1°C | 1 mm | 41% | 1.8 m/s | 6 |
| 2010 | 33.1°C | 24.0°C | 14.9°C | 41.3°C | 10.7°C | 0 mm | 40% | 1.7 m/s | 6.1 |
| 2009 | 34.3°C | 25.2°C | 16.1°C | 40.6°C | 9.9°C | 6 mm | 40% | 1.8 m/s | 5.9 |
| 2008 | 34.2°C | 24.7°C | 15.2°C | 42.0°C | 10.6°C | 0 mm | 37% | 1.8 m/s | 6.2 |
| 2007 | 30.1°C | 22.0°C | 13.9°C | 40.6°C | 9.2°C | 6 mm | 48% | 2 m/s | 5.8 |
| 2006 | 32.8°C | 23.6°C | 14.4°C | 38.9°C | 10.6°C | 1 mm | 38% | 2 m/s | 6.1 |
| 2005 | 30.6°C | 21.8°C | 12.9°C | 36.6°C | 10.1°C | 4 mm | 45% | 1.8 m/s | 6.2 |
| 2004 | 33.2°C | 24.2°C | 15.2°C | 40.5°C | 10.1°C | 6 mm | 37% | 1.8 m/s | 6.2 |
| 2003 | 34.6°C | 25.4°C | 16.2°C | 41.8°C | 13.1°C | 1 mm | 39% | 2 m/s | 6.1 |
| 2002 | 33.9°C | 24.5°C | 15.0°C | 41.6°C | 10.5°C | 0 mm | 38% | 1.9 m/s | 6.1 |
| 2001 | 33.4°C | 24.0°C | 14.5°C | 38.8°C | 11.2°C | 8 mm | 45% | 2 m/s | 6 |
| 2000 | 32.4°C | 23.7°C | 15.0°C | 41.3°C | 9.9°C | 11 mm | 42% | 1.7 m/s | 5.8 |
| 1999 | 34.6°C | 24.7°C | 14.7°C | 38.4°C | 11.8°C | 2 mm | 38% | 1.8 m/s | 6.1 |
| 1998 | 32.4°C | 24.0°C | 15.6°C | 43.9°C | 10.8°C | 12 mm | 48% | 2 m/s | 5.7 |
| 1997 | 33.9°C | 25.0°C | 16.1°C | 39.3°C | 12.2°C | 2 mm | 41% | 2 m/s | 6 |
| 1996 | 31.9°C | 22.7°C | 13.5°C | 37.3°C | 10.7°C | 4 mm | 40% | 1.8 m/s | 6 |
| 1995 | 33.0°C | 23.7°C | 14.4°C | 39.0°C | 11.7°C | 0 mm | 44% | 1.9 m/s | 6.1 |
| 1994 | 32.4°C | 23.6°C | 14.8°C | 37.6°C | 11.2°C | 5 mm | 43% | 1.7 m/s | 5.7 |
| 1993 | 33.5°C | 24.1°C | 14.7°C | 39.7°C | 10.1°C | 5 mm | 37% | 1.7 m/s | 6.2 |
| 1992 | 33.3°C | 24.1°C | 14.9°C | 37.4°C | 11.7°C | 0 mm | 39% | 1.8 m/s | 6 |
| 1991 | 34.4°C | 24.9°C | 15.4°C | 40.1°C | 11.3°C | 1 mm | 40% | 1.7 m/s | 6.1 |
| 1990 | 33.2°C | 23.8°C | 14.4°C | 38.0°C | 11.9°C | 3 mm | 43% | 1.7 m/s | 6.1 |
| 1989 🌧️ | 30.0°C | 21.4°C | 12.8°C | 36.0°C | 9.3°C | 67 mm | 50% | 1.7 m/s | 5.7 |
| 1988 | 34.4°C | 24.5°C | 14.7°C | 46.0°C | 10.4°C | 1 mm | 32% | 1.8 m/s | 5.8 |
| 1987 | 34.1°C | 24.5°C | 14.8°C | 41.2°C | 11.0°C | 0 mm | 37% | 1.8 m/s | 5.9 |
| 1986 ❄️ | 27.7°C | 19.9°C | 12.0°C | 38.7°C | 7.9°C | 42 mm | 51% | 2 m/s | 5.7 |
| 1985 | 28.5°C | 20.5°C | 12.6°C | 35.6°C | 8.3°C | 22 mm | 49% | 1.7 m/s | 5.6 |
| 1984 🔥 | 34.9°C | 26.0°C | 17.2°C | 40.0°C | 12.0°C | 5 mm | 31% | 1.7 m/s | 5.6 |
| 1983 | 32.8°C | 24.3°C | 15.7°C | 40.1°C | 12.8°C | 28 mm | 44% | 1.7 m/s | — |
| 1982 | 30.0°C | 22.2°C | 14.3°C | 39.8°C | 8.6°C | 59 mm | 44% | 1.6 m/s | — |
| 1981 | 33.2°C | 23.9°C | 14.6°C | 37.3°C | 11.1°C | 9 mm | 39% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 32.9°C with lows near 15°C (mean 24°C), based on 45 years of NASA POWER data.
September averages 9 mm of rainfall in Sacramento, one of the drier months. The wettest on record was 67 mm in 1989.
The hottest September reached 48.1°C in 2022. The coldest dipped to 7.9°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 31.9°C to 33.6°C and overnight lows from 14.9°C to 15.9°C over the same span.
September is one of the warmer months of the year in Sacramento and one of the drier months, so plan for around 32.9°C daytime highs and 15°C at night.
Not quite — September is the 10th coolest month in Sacramento, averaging 24°C.
For September in Sacramento, pack light, breathable clothing and sun protection, with typical highs of 32.9°C and lows of 15°C.
Relative humidity in September averages 42% — relatively dry.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.1 m/s (2013).
The wettest September on record was 1989 with 67 mm. On average, September sees 9 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 Sacramento 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.
