September is one of the cooler months of the year in Richmond, with average highs near 11.5°C and lows around 3.4°C (mean 7.5°C). It is about average for rainfall, averaging 88 mm of rainfall and 85% relative humidity across the period.
September is one of the cooler months of the year in Richmond. Across 45 years of records, the warmest Septembers in Richmond were 2001 and 2023 — when the month averaged 8.7°C — while the coldest was 1992 at 5.6°C. Typical September days reach 11.5°C with nights near 3.4°C. The long-term September temperature trend is broadly flat.
September is about average for rainfall in Richmond, averaging 88 mm of rainfall. The wettest September on record was 1995 with 187 mm, while the driest was 2001 at 17 mm.
Relative humidity in Richmond during September averages 85%. The most humid Septembers were 1991 and 2017 at 88%, and the least humid was 2009 at 80%.
September receives about 3.8 kWh/m²/day of solar energy in Richmond. The sunniest September was 2011 at 4.3 kWh/m²/day, and the cloudiest was 2010 at 3.3.
Average wind speed in Richmond during September is 1.4 m/s. The windiest Septembers were 2010 and 2020 at 1.8 m/s, while the calmest were 1992, 1997 and 2001, among others at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.6°C | 7.1°C | 7.8°C | 7.5°C | 7.6°C | 0°C |
| Avg High | 11.7°C | 11.0°C | 12.0°C | 11.5°C | 11.5°C | -0.2°C |
| Avg Low | 3.4°C | 3.1°C | 3.6°C | 3.4°C | 3.8°C | +0.4°C |
| Avg Rain | 89 mm | 103 mm | 68 mm | 88 mm | 95 mm | +6 mm |
September temperatures in Richmond have risen by about 0.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.5°C (1989) to a record high of 18.8°C (1999).
Rainfall in September is about average for rainfall, averaging 88 mm, with a wettest year of 187 mm.
A quieter season to visit Richmond
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Richmond. That said, September — with days averaging 11.5°C and nights around 3.4°C (mean 7.5°C) and higher rainfall (88 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 11.3°C | 7.4°C | 3.6°C | 15.1°C | 0.7°C | 82 mm | 86% | 1.7 m/s | 4 |
| 2024 | 11.5°C | 7.5°C | 3.5°C | 15.1°C | -1.5°C | 79 mm | 86% | 1.5 m/s | 4 |
| 2023 | 12.2°C | 8.7°C | 5.3°C | 16.5°C | 1.4°C | 92 mm | 86% | 1.6 m/s | 3.7 |
| 2022 | 11.1°C | 7.4°C | 3.7°C | 16.3°C | -1.8°C | 95 mm | 88% | 1.3 m/s | 3.5 |
| 2021 | 10.9°C | 7.0°C | 3.1°C | 14.6°C | -1.1°C | 117 mm | 86% | 1.6 m/s | 3.9 |
| 2020 | 11.7°C | 7.6°C | 3.5°C | 14.7°C | -2.1°C | 104 mm | 85% | 1.8 m/s | 4.1 |
| 2019 | 11.3°C | 7.3°C | 3.3°C | 15.8°C | 0.0°C | 110 mm | 86% | 1.4 m/s | 3.8 |
| 2018 | 12.5°C | 8.0°C | 3.4°C | 16.3°C | 0.2°C | 37 mm | 84% | 1.3 m/s | 4.2 |
| 2017 | 11.6°C | 7.9°C | 4.2°C | 16.1°C | -0.2°C | 109 mm | 88% | 1.4 m/s | 3.5 |
| 2016 | 12.3°C | 8.4°C | 4.5°C | 14.9°C | -0.7°C | 77 mm | 87% | 1.3 m/s | 3.6 |
| 2015 | 10.5°C | 6.4°C | 2.4°C | 15.4°C | -1.0°C | 80 mm | 85% | 1.4 m/s | 4 |
| 2014 | 12.0°C | 7.7°C | 3.5°C | 17.0°C | -1.3°C | 84 mm | 86% | 1.3 m/s | 3.8 |
| 2013 | 11.6°C | 7.7°C | 3.8°C | 15.8°C | -0.9°C | 94 mm | 85% | 1.6 m/s | 3.7 |
| 2012 | 11.3°C | 7.3°C | 3.4°C | 16.7°C | -1.9°C | 103 mm | 86% | 1.4 m/s | 3.7 |
| 2011 | 11.3°C | 6.8°C | 2.3°C | 14.8°C | -1.0°C | 45 mm | 84% | 1.2 m/s | 4.3 |
| 2010 | 10.5°C | 7.1°C | 3.7°C | 16.2°C | -1.2°C | 140 mm | 87% | 1.8 m/s | 3.3 |
| 2009 | 11.7°C | 7.3°C | 2.9°C | 16.9°C | -1.4°C | 90 mm | 80% | 1.2 m/s | 3.9 |
| 2008 | 12.1°C | 7.8°C | 3.5°C | 17.7°C | -1.2°C | 86 mm | 87% | 1.2 m/s | 3.6 |
| 2007 | 12.3°C | 8.0°C | 3.6°C | 17.1°C | -2.5°C | 46 mm | 84% | 1.2 m/s | 3.9 |
| 2006 | 12.7°C | 8.5°C | 4.4°C | 15.7°C | 0.0°C | 28 mm | 85% | 1.4 m/s | 3.8 |
| 2005 | 12.7°C | 8.6°C | 4.4°C | 15.8°C | -1.2°C | 33 mm | 85% | 1.3 m/s | 3.7 |
| 2004 | 10.7°C | 6.5°C | 2.2°C | 15.2°C | -1.8°C | 112 mm | 86% | 1.5 m/s | 3.7 |
| 2003 | 10.9°C | 7.1°C | 3.2°C | 15.1°C | 0.2°C | 120 mm | 85% | 1.6 m/s | 3.6 |
| 2002 | 11.7°C | 7.8°C | 3.8°C | 16.8°C | -1.4°C | 81 mm | 84% | 1.6 m/s | 3.6 |
| 2001 🔥 | 13.4°C | 8.7°C | 4.1°C | 16.9°C | 0.3°C | 17 mm | 81% | 1.1 m/s | 4 |
| 2000 | 11.4°C | 7.4°C | 3.5°C | 15.6°C | -0.9°C | 69 mm | 85% | 1.3 m/s | 3.6 |
| 1999 | 12.6°C | 8.2°C | 3.9°C | 18.8°C | -1.0°C | 44 mm | 85% | 1.2 m/s | 3.9 |
| 1998 | 12.4°C | 8.2°C | 4.1°C | 16.1°C | 0.3°C | 71 mm | 85% | 1.4 m/s | 4 |
| 1997 | 10.5°C | 6.4°C | 2.3°C | 14.3°C | -2.3°C | 52 mm | 84% | 1.1 m/s | 3.7 |
| 1996 | 12.3°C | 8.5°C | 4.6°C | 17.7°C | 0.0°C | 111 mm | 88% | 1.2 m/s | 3.6 |
| 1995 🌧️ | 10.7°C | 7.0°C | 3.3°C | 13.3°C | -1.6°C | 187 mm | 88% | 1.4 m/s | 3.4 |
| 1994 | 9.9°C | 6.1°C | 2.4°C | 13.4°C | -1.1°C | 125 mm | 87% | 1.3 m/s | 3.7 |
| 1993 | 9.9°C | 5.9°C | 1.9°C | 14.9°C | -2.1°C | 99 mm | 84% | 1.4 m/s | 3.9 |
| 1992 ❄️ | 9.4°C | 5.6°C | 1.8°C | 12.4°C | -1.6°C | 128 mm | 87% | 1.1 m/s | 3.9 |
| 1991 | 11.1°C | 7.6°C | 4.1°C | 13.1°C | 0.5°C | 135 mm | 88% | 1.2 m/s | 3.8 |
| 1990 | 11.5°C | 7.0°C | 2.6°C | 15.1°C | -1.6°C | 75 mm | 84% | 1.1 m/s | 4.2 |
| 1989 | 12.2°C | 8.2°C | 4.3°C | 17.8°C | -2.5°C | 82 mm | 87% | 1.1 m/s | 3.8 |
| 1988 | 12.8°C | 8.6°C | 4.4°C | 16.8°C | -1.8°C | 83 mm | 86% | 1.4 m/s | 3.7 |
| 1987 | 11.7°C | 7.7°C | 3.7°C | 17.1°C | 0.0°C | 99 mm | 86% | 1.4 m/s | 3.8 |
| 1986 | 11.4°C | 7.0°C | 2.6°C | 15.5°C | -1.3°C | 109 mm | 85% | 1.3 m/s | 4.1 |
| 1985 | 11.2°C | 7.4°C | 3.6°C | 13.6°C | -1.6°C | 96 mm | 85% | 1.4 m/s | 4.2 |
| 1984 | 11.6°C | 7.2°C | 2.8°C | 14.7°C | -2.0°C | 51 mm | 86% | 1.3 m/s | 3.9 |
| 1983 | 11.4°C | 7.6°C | 3.7°C | 17.0°C | -0.3°C | 104 mm | 87% | 1.5 m/s | — |
| 1982 | 11.9°C | 7.4°C | 3.0°C | 16.0°C | -0.7°C | 104 mm | 84% | 1.1 m/s | — |
| 1981 | 11.1°C | 6.9°C | 2.7°C | 14.7°C | -1.1°C | 71 mm | 85% | 1.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 11.5°C with lows near 3.4°C (mean 7.5°C), based on 45 years of NASA POWER data.
September averages 88 mm of rainfall in Richmond, about average for rainfall. The wettest on record was 187 mm in 1995.
The hottest September reached 18.8°C in 1999. The coldest dipped to -2.5°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.3°C. Daytime highs moved from 11.4°C to 11.4°C and overnight lows from 3.2°C to 3.8°C over the same span.
September is one of the cooler months of the year in Richmond and about average for rainfall, so plan for around 11.5°C daytime highs and 3.4°C at night.
Not quite — September is the 4th coolest month in Richmond, averaging 7.5°C.
For September in Richmond, pack warm layers and a jacket for chilly mornings, with typical highs of 11.5°C and lows of 3.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 1.4 m/s. The windiest September on record averaged 1.8 m/s (2010).
The wettest September on record was 1995 with 187 mm. On average, September sees 88 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.
