September is one of the cooler months of the year in Richmond, with average highs near 19.9°C and lows around 7.7°C (mean 13.8°C). It is one of the drier months, averaging 53 mm of rainfall and 67% relative humidity across the period.
September is one of the cooler months of the year in Richmond. Across 45 years of records, the warmest September in Richmond was 2023 — when the month averaged 17.2°C — while the coldest was 1989 at 11.5°C. Typical September days reach 19.9°C with nights near 7.7°C. The long-term trend is warming, about 0.5°C per decade.
September is one of the drier months in Richmond, averaging 53 mm of rainfall. The wettest September on record was 1982 with 155 mm, while the driest was 2017 at 1 mm.
Relative humidity in Richmond during September averages 67%. The most humid September was 1998 at 83%, and the least humid was 2017 at 45%.
September receives about 4.9 kWh/m²/day of solar energy in Richmond. The sunniest September was 2017 at 5.6 kWh/m²/day, and the cloudiest was 2022 at 4.1.
Average wind speed in Richmond during September is 0.4 m/s. The windiest Septembers were 2021, 2023 and 2024, among others at 0.4 m/s, while the calmest were 2015, 2022 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.9°C | 12.9°C | 14.5°C | 14.3°C | 14.7°C | +1.8°C |
| Avg High | 18.9°C | 18.6°C | 20.9°C | 20.6°C | 21.0°C | +2.1°C |
| Avg Low | 7.0°C | 7.1°C | 8.1°C | 8.0°C | 8.5°C | +1.5°C |
| Avg Rain | 60 mm | 66 mm | 50 mm | 45 mm | 40 mm | -20 mm |
September temperatures in Richmond have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.7°C (1991) to a record high of 34°C (2017).
Rainfall in September is one of the drier months, averaging 53 mm, with a wettest year of 155 mm.
A good time to visit Richmond
September is a good time to visit Richmond, with days averaging 19.9°C and nights around 7.7°C (mean 13.8°C, cooler than Richmond's yearly average) and moderate rainfall. December and February are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.2°C | 14.2°C | 8.3°C | 26.6°C | 4.1°C | 45 mm | 72% | 0.3 m/s | 5.2 |
| 2024 | 22.0°C | 15.3°C | 8.6°C | 28.0°C | 3.1°C | 31 mm | 55% | 0.4 m/s | 5 |
| 2023 🔥 | 25.1°C | 17.2°C | 9.3°C | 33.2°C | 3.5°C | 11 mm | 51% | 0.4 m/s | 5.5 |
| 2022 | 17.0°C | 12.6°C | 8.3°C | 20.2°C | 4.3°C | 86 mm | 83% | 0.3 m/s | 4.1 |
| 2021 | 21.0°C | 14.4°C | 7.7°C | 26.1°C | 3.7°C | 38 mm | 61% | 0.4 m/s | 5 |
| 2020 | 20.5°C | 14.6°C | 8.7°C | 27.3°C | 5.1°C | 32 mm | 71% | 0.4 m/s | 4.7 |
| 2019 | 21.2°C | 14.6°C | 8.0°C | 27.7°C | 4.5°C | 55 mm | 61% | 0.4 m/s | 5.1 |
| 2018 | 20.9°C | 14.2°C | 7.5°C | 29.4°C | 4.2°C | 41 mm | 61% | 0.4 m/s | 4.9 |
| 2017 | 23.0°C | 15.8°C | 8.5°C | 34.0°C | 3.1°C | 1 mm | 45% | 0.4 m/s | 5.6 |
| 2016 | 19.3°C | 13.8°C | 8.3°C | 22.2°C | 4.1°C | 62 mm | 70% | 0.4 m/s | 4.3 |
| 2015 | 19.4°C | 13.4°C | 7.4°C | 25.4°C | 2.9°C | 35 mm | 70% | 0.3 m/s | 4.8 |
| 2014 | 18.7°C | 13.2°C | 7.6°C | 27.7°C | 4.1°C | 43 mm | 75% | 0.3 m/s | 4.9 |
| 2013 | 23.0°C | 16.3°C | 9.6°C | 29.3°C | 5.9°C | 36 mm | 59% | 0.4 m/s | 5.4 |
| 2012 | 21.4°C | 14.4°C | 7.5°C | 29.7°C | 1.3°C | 26 mm | 59% | 0.4 m/s | 5.4 |
| 2011 | 18.9°C | 13.2°C | 7.5°C | 26.2°C | 2.7°C | 109 mm | 73% | 0.3 m/s | 4.8 |
| 2010 | 19.7°C | 13.8°C | 7.9°C | 24.5°C | 3.8°C | 41 mm | 70% | 0.3 m/s | 4.7 |
| 2009 | 22.3°C | 15.7°C | 9.0°C | 29.4°C | 4.4°C | 20 mm | 58% | 0.4 m/s | 5.1 |
| 2008 | 19.9°C | 13.6°C | 7.4°C | 28.0°C | 1.1°C | 95 mm | 69% | 0.4 m/s | 5.1 |
| 2007 | 18.0°C | 12.6°C | 7.1°C | 22.5°C | 2.7°C | 38 mm | 76% | 0.3 m/s | 5 |
| 2006 | 20.3°C | 14.5°C | 8.6°C | 27.9°C | 4.9°C | 125 mm | 69% | 0.4 m/s | 5 |
| 2005 | 20.3°C | 14.0°C | 7.7°C | 28.3°C | 3.8°C | 55 mm | 66% | 0.4 m/s | 4.6 |
| 2004 | 20.9°C | 14.5°C | 8.0°C | 30.7°C | 2.8°C | 59 mm | 65% | 0.3 m/s | 4.7 |
| 2003 | 20.7°C | 14.2°C | 7.6°C | 31.1°C | 2.9°C | 7 mm | 56% | 0.4 m/s | 5.3 |
| 2002 | 22.5°C | 15.3°C | 8.0°C | 29.5°C | 2.8°C | 30 mm | 52% | 0.4 m/s | 5.2 |
| 2001 | 21.2°C | 15.0°C | 8.9°C | 29.2°C | 5.8°C | 28 mm | 69% | 0.4 m/s | 4.6 |
| 2000 | 22.7°C | 15.7°C | 8.8°C | 31.1°C | 3.0°C | 40 mm | 62% | 0.4 m/s | 5 |
| 1999 | 19.2°C | 13.7°C | 8.1°C | 25.0°C | 2.4°C | 50 mm | 76% | 0.3 m/s | 4.6 |
| 1998 | 18.6°C | 13.8°C | 9.0°C | 27.7°C | 2.6°C | 53 mm | 83% | 0.3 m/s | 4.5 |
| 1997 | 17.8°C | 12.7°C | 7.7°C | 22.9°C | 4.1°C | 90 mm | 77% | 0.3 m/s | 4.3 |
| 1996 | 18.7°C | 13.1°C | 7.5°C | 25.7°C | 3.5°C | 88 mm | 67% | 0.4 m/s | 4.9 |
| 1995 | 18.8°C | 13.0°C | 7.2°C | 26.4°C | 1.3°C | 155 mm | 71% | 0.3 m/s | 4.3 |
| 1994 | 20.6°C | 13.3°C | 6.1°C | 26.1°C | 1.6°C | 12 mm | 52% | 0.4 m/s | 5.5 |
| 1993 | 18.1°C | 12.4°C | 6.6°C | 24.7°C | 3.0°C | 75 mm | 74% | 0.4 m/s | 4.6 |
| 1992 | 18.3°C | 12.0°C | 5.8°C | 24.4°C | 1.5°C | 30 mm | 64% | 0.4 m/s | 4.6 |
| 1991 | 19.7°C | 13.2°C | 6.7°C | 25.6°C | 0.7°C | 20 mm | 61% | 0.4 m/s | 5.2 |
| 1990 | 16.5°C | 11.6°C | 6.7°C | 23.4°C | 3.7°C | 88 mm | 83% | 0.4 m/s | 4.5 |
| 1989 ❄️ | 17.6°C | 11.5°C | 5.5°C | 23.5°C | 2.7°C | 8 mm | 74% | 0.4 m/s | 5.3 |
| 1988 | 18.2°C | 13.1°C | 8.0°C | 22.5°C | 4.5°C | 121 mm | 81% | 0.3 m/s | 4.5 |
| 1987 | 19.5°C | 13.3°C | 7.1°C | 26.8°C | 2.2°C | 16 mm | 71% | 0.3 m/s | 5.2 |
| 1986 | 18.0°C | 12.7°C | 7.4°C | 24.9°C | 3.1°C | 71 mm | 78% | 0.3 m/s | 4.7 |
| 1985 | 17.1°C | 11.7°C | 6.4°C | 22.2°C | 3.4°C | 71 mm | 78% | 0.4 m/s | 4.7 |
| 1984 | 17.6°C | 11.7°C | 5.9°C | 22.6°C | 2.5°C | 36 mm | 68% | 0.3 m/s | 4.6 |
| 1983 | 19.9°C | 13.7°C | 7.6°C | 27.6°C | 2.9°C | 53 mm | 70% | 0.3 m/s | — |
| 1982 🌧️ | 19.0°C | 12.7°C | 6.5°C | 28.4°C | 1.8°C | 155 mm | 65% | 0.4 m/s | — |
| 1981 | 23.3°C | 15.8°C | 8.2°C | 31.5°C | 2.5°C | 9 mm | 59% | 0.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.9°C with lows near 7.7°C (mean 13.8°C), based on 45 years of NASA POWER data.
September averages 53 mm of rainfall in Richmond, one of the drier months. The wettest on record was 155 mm in 1982.
The hottest September reached 34°C in 2017. The coldest dipped to 0.7°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.6°C. Daytime highs moved from 19.4°C to 21.1°C and overnight lows from 6.9°C to 8.4°C over the same span.
September is one of the cooler months of the year in Richmond and one of the drier months, so plan for around 19.9°C daytime highs and 7.7°C at night.
Not quite — September is the 5th coolest month in Richmond, averaging 13.8°C.
For September in Richmond, pack warm layers and a jacket for chilly mornings, with typical highs of 19.9°C and lows of 7.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 67% — moderately humid.
Average wind speed in September is 0.4 m/s. The windiest September on record averaged 0.4 m/s (1981).
The wettest September on record was 1982 with 155 mm. On average, September sees 53 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 Richmond 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.
