September is one of the cooler months of the year in Richmond, with average highs near 33.6°C and lows around 16.6°C (mean 25.1°C). It is one of the drier months, averaging 4 mm of rainfall and 32% 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 2013 — when the month averaged 26.9°C — while the coldest were 1984, 1985 and 1990 at 22.6°C. Typical September days reach 33.6°C with nights near 16.6°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Richmond, averaging 4 mm of rainfall. The wettest September on record was 2010 with 49 mm, while the driest were 2019, 2023 and 2024, among others at 0 mm.
Relative humidity in Richmond during September averages 32%. The most humid September was 2010 at 55%, and the least humid was 2002 at 24%.
September receives about 6.8 kWh/m²/day of solar energy in Richmond. The sunniest Septembers were 2002, 2018 and 2019, among others at 7.2 kWh/m²/day, and the cloudiest was 2010 at 5.7.
Average wind speed in Richmond during September is 3.3 m/s. The windiest September was 1990 at 4 m/s, while the calmest was 1988 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.3°C | 25.0°C | 25.1°C | 25.2°C | 26.1°C | +1.8°C |
| Avg High | 32.9°C | 33.5°C | 33.7°C | 33.7°C | 34.3°C | +1.4°C |
| Avg Low | 15.8°C | 16.6°C | 16.4°C | 16.8°C | 17.8°C | +2°C |
| Avg Rain | 2 mm | 4 mm | 2 mm | 7 mm | 6 mm | +4 mm |
September temperatures in Richmond have risen by about 2.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7.5°C (1984) to a record high of 41.6°C (1988).
Rainfall in September is one of the drier months, averaging 4 mm, with a wettest year of 49 mm.
One of the best times to visit Richmond
September is one of the best times to visit Richmond. Expect days averaging 33.6°C and nights around 16.6°C (mean 25.1°C) — close to Richmond's yearly average — with low rainfall (4 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 | 34.6°C | 26.4°C | 18.1°C | 39.2°C | 9.6°C | 0 mm | 32% | 3.2 m/s | 6.6 |
| 2024 | 35.0°C | 26.7°C | 18.3°C | 38.8°C | 15.3°C | 0 mm | 32% | 3.6 m/s | 6.7 |
| 2023 | 34.2°C | 25.9°C | 17.5°C | 38.3°C | 12.8°C | 0 mm | 31% | 3.5 m/s | 7 |
| 2022 | 33.9°C | 25.7°C | 17.5°C | 40.3°C | 10.5°C | 10 mm | 36% | 3.3 m/s | 6.5 |
| 2021 | 34.0°C | 25.6°C | 17.3°C | 38.1°C | 10.7°C | 5 mm | 35% | 3.7 m/s | 6.8 |
| 2020 | 34.3°C | 26.2°C | 18.0°C | 39.0°C | 14.5°C | 18 mm | 39% | 3.7 m/s | 6.9 |
| 2019 | 33.9°C | 24.7°C | 15.6°C | 38.8°C | 8.8°C | 0 mm | 26% | 3 m/s | 7.2 |
| 2018 | 33.6°C | 24.7°C | 15.8°C | 37.5°C | 10.0°C | 0 mm | 27% | 3.4 m/s | 7.2 |
| 2017 | 35.0°C | 25.8°C | 16.5°C | 41.3°C | 10.6°C | 0 mm | 26% | 2.9 m/s | 7.1 |
| 2016 | 33.4°C | 25.8°C | 18.3°C | 37.4°C | 11.9°C | 11 mm | 43% | 3.3 m/s | 5.9 |
| 2015 | 32.6°C | 24.4°C | 16.2°C | 35.8°C | 11.8°C | 0 mm | 27% | 3.1 m/s | 6.9 |
| 2014 | 33.6°C | 24.6°C | 15.6°C | 36.9°C | 8.7°C | 1 mm | 26% | 3.1 m/s | 7 |
| 2013 🔥 | 35.5°C | 26.9°C | 18.3°C | 39.9°C | 13.4°C | 0 mm | 26% | 3 m/s | 7 |
| 2012 | 33.9°C | 25.4°C | 16.8°C | 39.2°C | 11.0°C | 5 mm | 34% | 3.1 m/s | 6.8 |
| 2011 | 32.6°C | 24.1°C | 15.7°C | 39.2°C | 8.9°C | 0 mm | 32% | 3.6 m/s | 7 |
| 2010 🌧️ | 32.8°C | 25.9°C | 19.0°C | 37.7°C | 13.8°C | 49 mm | 55% | 3.3 m/s | 5.7 |
| 2009 | 34.3°C | 25.5°C | 16.7°C | 39.2°C | 11.7°C | 0 mm | 27% | 3.2 m/s | 7 |
| 2008 | 34.1°C | 25.8°C | 17.6°C | 38.3°C | 11.7°C | 7 mm | 40% | 3.2 m/s | 6.7 |
| 2007 | 33.5°C | 24.8°C | 16.1°C | 38.2°C | 12.7°C | 2 mm | 35% | 2.9 m/s | 7 |
| 2006 | 32.0°C | 24.0°C | 16.0°C | 36.4°C | 8.5°C | 2 mm | 37% | 3.7 m/s | 6.9 |
| 2005 | 34.0°C | 25.2°C | 16.4°C | 39.0°C | 11.3°C | 4 mm | 33% | 3 m/s | 6.9 |
| 2004 | 32.6°C | 24.1°C | 15.5°C | 37.7°C | 8.8°C | 1 mm | 31% | 3.3 m/s | 7 |
| 2003 | 34.6°C | 25.8°C | 16.9°C | 40.1°C | 7.6°C | 0 mm | 27% | 3.1 m/s | 7 |
| 2002 | 34.5°C | 25.3°C | 16.1°C | 39.0°C | 11.3°C | 0 mm | 24% | 3.1 m/s | 7.2 |
| 2001 | 33.4°C | 25.0°C | 16.6°C | 36.4°C | 9.5°C | 0 mm | 32% | 3.5 m/s | 6.7 |
| 2000 | 34.3°C | 25.3°C | 16.3°C | 39.8°C | 12.7°C | 0 mm | 29% | 3.4 m/s | 6.9 |
| 1999 | 33.5°C | 25.2°C | 16.9°C | 36.1°C | 11.5°C | 0 mm | 32% | 3.5 m/s | 6.8 |
| 1998 | 33.6°C | 26.1°C | 18.6°C | 37.8°C | 11.7°C | 24 mm | 51% | 3.4 m/s | 6.7 |
| 1997 | 35.0°C | 26.7°C | 18.4°C | 39.1°C | 13.2°C | 2 mm | 31% | 3.1 m/s | 6.6 |
| 1996 | 33.3°C | 24.0°C | 14.8°C | 37.8°C | 8.7°C | 5 mm | 28% | 3.1 m/s | 6.9 |
| 1995 | 34.3°C | 25.6°C | 17.0°C | 37.6°C | 9.8°C | 1 mm | 32% | 3.1 m/s | 6.7 |
| 1994 | 33.0°C | 24.1°C | 15.2°C | 37.0°C | 10.7°C | 0 mm | 24% | 3 m/s | 6.7 |
| 1993 | 33.2°C | 25.5°C | 17.7°C | 37.8°C | 11.0°C | 2 mm | 37% | 3.3 m/s | 7 |
| 1992 | 34.1°C | 25.8°C | 17.5°C | 37.6°C | 11.8°C | 5 mm | 30% | 3.3 m/s | 6.7 |
| 1991 | 34.0°C | 24.9°C | 15.8°C | 37.4°C | 11.1°C | 0 mm | 24% | 3.1 m/s | 7.1 |
| 1990 | 31.0°C | 22.6°C | 14.2°C | 35.3°C | 7.7°C | 0 mm | 39% | 4 m/s | 7.1 |
| 1989 | 33.8°C | 24.8°C | 15.8°C | 39.1°C | 10.1°C | 0 mm | 26% | 3.4 m/s | 7.2 |
| 1988 | 33.2°C | 24.6°C | 16.0°C | 41.6°C | 8.8°C | 0 mm | 40% | 2.8 m/s | 6.7 |
| 1987 | 32.6°C | 24.3°C | 15.9°C | 35.8°C | 10.0°C | 1 mm | 33% | 3.5 m/s | 6.9 |
| 1986 | 33.6°C | 25.7°C | 17.9°C | 39.7°C | 8.6°C | 2 mm | 31% | 2.9 m/s | 6.8 |
| 1985 | 31.5°C | 22.6°C | 13.6°C | 36.8°C | 7.6°C | 0 mm | 25% | 3.6 m/s | 7.1 |
| 1984 ❄️ | 31.7°C | 22.6°C | 13.6°C | 37.2°C | 7.5°C | 4 mm | 30% | 3.1 m/s | 6.8 |
| 1983 | 35.2°C | 26.5°C | 17.7°C | 38.2°C | 12.3°C | 0 mm | 30% | 3.1 m/s | — |
| 1982 | 31.6°C | 23.2°C | 14.7°C | 37.1°C | 9.3°C | 8 mm | 32% | 3 m/s | — |
| 1981 | 32.7°C | 24.8°C | 16.9°C | 38.1°C | 9.9°C | 4 mm | 37% | 3.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 33.6°C with lows near 16.6°C (mean 25.1°C), based on 45 years of NASA POWER data.
September averages 4 mm of rainfall in Richmond, one of the drier months. The wettest on record was 49 mm in 2010.
The hottest September reached 41.6°C in 1988. The coldest dipped to 7.5°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.2°C. Daytime highs moved from 32.5°C to 34.3°C and overnight lows from 15.3°C to 17.7°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 33.6°C daytime highs and 16.6°C at night.
Not quite — September is the 5th coolest month in Richmond, averaging 25.1°C.
For September in Richmond, pack light, breathable clothing and sun protection, with typical highs of 33.6°C and lows of 16.6°C.
Relative humidity in September averages 32% — relatively dry.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4 m/s (1990).
The wettest September on record was 2010 with 49 mm. On average, September sees 4 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.
