September is one of the warmer months of the year in Grovetown, with average highs near 30.2°C and lows around 18.2°C (mean 24.2°C). It is about average for rainfall, averaging 90 mm of rainfall and 70% relative humidity across the period.
September is one of the warmer months of the year in Grovetown. Across 45 years of records, the warmest Septembers in Grovetown were 2018 and 2019 — when the month averaged 27.8°C — while the coldest was 1994 at 22.1°C. Typical September days reach 30.2°C with nights near 18.2°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Grovetown, averaging 90 mm of rainfall. The wettest September on record was 2004 with 269 mm, while the driest was 2005 at 8 mm.
Relative humidity in Grovetown during September averages 70%. The most humid September was 1995 at 81%, and the least humid was 1981 at 58%.
September receives about 4.8 kWh/m²/day of solar energy in Grovetown. The sunniest September was 2019 at 5.8 kWh/m²/day, and the cloudiest was 1988 at 3.9.
Average wind speed in Grovetown during September is 1 m/s. The windiest September was 2004 at 1.6 m/s, while the calmest were 1986, 2021 and 2023, among others at 0.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.7°C | 23.8°C | 24.1°C | 25.2°C | 24.1°C | +0.4°C |
| Avg High | 29.8°C | 29.9°C | 29.9°C | 31.3°C | 30.0°C | +0.2°C |
| Avg Low | 17.5°C | 17.7°C | 18.3°C | 19.2°C | 18.3°C | +0.8°C |
| Avg Rain | 75 mm | 98 mm | 102 mm | 77 mm | 104 mm | +30 mm |
September temperatures in Grovetown have risen by about 0.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7°C (1983) to a record high of 38.5°C (1990).
Rainfall in September is about average for rainfall, averaging 90 mm, with a wettest year of 269 mm.
One of the best times to visit Grovetown
September is one of the best times to visit Grovetown. Expect days averaging 30.2°C and nights around 18.2°C (mean 24.2°C) — warmer than Grovetown's yearly average — with higher rainfall (90 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 | 30.6°C | 24.3°C | 18.0°C | 35.8°C | 12.8°C | 29 mm | 68% | 0.9 m/s | 5.3 |
| 2024 | 30.7°C | 25.2°C | 19.8°C | 37.0°C | 15.9°C | 212 mm | 73% | 1.3 m/s | 4.3 |
| 2023 | 30.2°C | 24.1°C | 18.0°C | 35.3°C | 14.5°C | 57 mm | 72% | 0.8 m/s | 5.1 |
| 2022 | 29.9°C | 24.0°C | 18.0°C | 36.4°C | 10.8°C | 66 mm | 69% | 1.1 m/s | 5.1 |
| 2021 | 29.8°C | 23.8°C | 17.7°C | 33.6°C | 10.9°C | 103 mm | 71% | 0.8 m/s | 4.9 |
| 2020 | 28.8°C | 23.4°C | 18.1°C | 36.2°C | 9.3°C | 159 mm | 77% | 1.1 m/s | 4.4 |
| 2019 | 35.0°C | 27.8°C | 20.7°C | 38.2°C | 13.3°C | 11 mm | 60% | 0.9 m/s | 5.8 |
| 2018 🔥 | 33.7°C | 27.8°C | 22.0°C | 36.3°C | 20.2°C | 81 mm | 69% | 1 m/s | 5 |
| 2017 | 30.5°C | 24.1°C | 17.8°C | 35.2°C | 13.1°C | 102 mm | 68% | 1.1 m/s | 5.2 |
| 2016 | 32.0°C | 25.9°C | 19.9°C | 36.1°C | 13.1°C | 89 mm | 71% | 0.9 m/s | 5.1 |
| 2015 | 29.3°C | 24.0°C | 18.7°C | 35.1°C | 11.3°C | 92 mm | 75% | 1 m/s | 4.3 |
| 2014 | 30.1°C | 24.8°C | 19.5°C | 35.9°C | 13.7°C | 97 mm | 76% | 0.9 m/s | 4.1 |
| 2013 | 28.5°C | 23.1°C | 17.7°C | 32.5°C | 12.0°C | 45 mm | 78% | 0.9 m/s | 5.2 |
| 2012 | 29.7°C | 23.7°C | 17.8°C | 34.2°C | 10.6°C | 69 mm | 73% | 0.9 m/s | 5 |
| 2011 | 31.2°C | 24.9°C | 18.7°C | 38.1°C | 14.2°C | 74 mm | 65% | 1 m/s | 4.6 |
| 2010 | 33.0°C | 26.0°C | 19.0°C | 36.9°C | 13.8°C | 106 mm | 62% | 0.9 m/s | 5.4 |
| 2009 | 29.3°C | 24.0°C | 18.8°C | 33.0°C | 10.1°C | 170 mm | 74% | 0.9 m/s | 4.5 |
| 2008 | 30.4°C | 24.6°C | 18.7°C | 36.7°C | 12.5°C | 57 mm | 70% | 1.1 m/s | 4.8 |
| 2007 | 32.1°C | 25.6°C | 19.0°C | 36.3°C | 12.7°C | 55 mm | 64% | 1.1 m/s | 5.1 |
| 2006 | 29.5°C | 23.5°C | 17.4°C | 33.3°C | 10.7°C | 62 mm | 71% | 1 m/s | 4.8 |
| 2005 | 33.2°C | 26.2°C | 19.3°C | 36.9°C | 15.5°C | 8 mm | 62% | 1.1 m/s | 5.5 |
| 2004 🌧️ | 27.7°C | 23.1°C | 18.5°C | 32.5°C | 11.9°C | 269 mm | 80% | 1.6 m/s | 4.4 |
| 2003 | 28.2°C | 22.7°C | 17.2°C | 32.0°C | 8.5°C | 42 mm | 74% | 1 m/s | 5.2 |
| 2002 | 30.5°C | 25.3°C | 20.1°C | 37.3°C | 16.3°C | 144 mm | 75% | 1.1 m/s | 4.1 |
| 2001 | 30.0°C | 23.3°C | 16.6°C | 34.9°C | 8.8°C | 54 mm | 63% | 1 m/s | 5.1 |
| 2000 | 27.8°C | 22.5°C | 17.1°C | 33.5°C | 8.9°C | 158 mm | 78% | 1.1 m/s | 4.4 |
| 1999 | 31.0°C | 23.8°C | 16.6°C | 37.8°C | 7.2°C | 109 mm | 60% | 1.1 m/s | 5 |
| 1998 | 30.6°C | 24.7°C | 18.8°C | 34.0°C | 11.2°C | 169 mm | 72% | 0.9 m/s | 4.8 |
| 1997 | 31.4°C | 24.7°C | 18.1°C | 36.7°C | 12.0°C | 161 mm | 64% | 1 m/s | 4.6 |
| 1996 | 29.9°C | 23.8°C | 17.7°C | 36.1°C | 12.3°C | 117 mm | 70% | 1.1 m/s | 4.6 |
| 1995 | 27.7°C | 22.5°C | 17.3°C | 33.1°C | 10.0°C | 89 mm | 81% | 1 m/s | 4.6 |
| 1994 ❄️ | 27.7°C | 22.1°C | 16.4°C | 32.3°C | 11.1°C | 77 mm | 77% | 1 m/s | 4.9 |
| 1993 | 32.4°C | 25.6°C | 18.8°C | 37.6°C | 8.8°C | 64 mm | 63% | 1 m/s | 4.8 |
| 1992 | 28.1°C | 23.0°C | 18.0°C | 32.2°C | 9.8°C | 113 mm | 81% | 0.9 m/s | 4.2 |
| 1991 | 28.7°C | 23.0°C | 17.3°C | 34.2°C | 8.3°C | 27 mm | 75% | 0.9 m/s | 5.3 |
| 1990 | 31.9°C | 25.1°C | 18.2°C | 38.5°C | 9.3°C | 51 mm | 63% | 0.9 m/s | 5.3 |
| 1989 | 28.6°C | 23.3°C | 18.1°C | 34.4°C | 10.6°C | 185 mm | 76% | 1.2 m/s | 4 |
| 1988 | 28.3°C | 23.2°C | 18.1°C | 33.1°C | 12.7°C | 145 mm | 81% | 1 m/s | 3.9 |
| 1987 | 30.5°C | 24.4°C | 18.4°C | 35.0°C | 12.0°C | 66 mm | 70% | 1 m/s | 4.6 |
| 1986 | 30.5°C | 24.7°C | 18.9°C | 35.4°C | 14.7°C | 51 mm | 75% | 0.8 m/s | 4.3 |
| 1985 | 30.3°C | 23.4°C | 16.6°C | 35.8°C | 9.1°C | 16 mm | 65% | 1.1 m/s | 5.2 |
| 1984 | 29.9°C | 23.1°C | 16.3°C | 36.1°C | 11.4°C | 21 mm | 63% | 1.2 m/s | 5 |
| 1983 | 28.4°C | 22.7°C | 17.0°C | 35.4°C | 7.0°C | 109 mm | 72% | 1 m/s | — |
| 1982 | 30.1°C | 23.8°C | 17.4°C | 35.2°C | 9.4°C | 50 mm | 65% | 0.9 m/s | — |
| 1981 | 31.8°C | 24.3°C | 16.7°C | 34.7°C | 9.4°C | 28 mm | 58% | 0.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.2°C with lows near 18.2°C (mean 24.2°C), based on 45 years of NASA POWER data.
September averages 90 mm of rainfall in Grovetown, about average for rainfall. The wettest on record was 269 mm in 2004.
The hottest September reached 38.5°C in 1990. The coldest dipped to 7°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.8°C. Daytime highs moved from 30.1°C to 30.2°C and overnight lows from 16.8°C to 18.3°C over the same span.
September is one of the warmer months of the year in Grovetown and about average for rainfall, so plan for around 30.2°C daytime highs and 18.2°C at night.
Not quite — September is the 9th coolest month in Grovetown, averaging 24.2°C.
For September in Grovetown, pack light, breathable clothing and sun protection, with typical highs of 30.2°C and lows of 18.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 70% — moderately humid.
Average wind speed in September is 1 m/s. The windiest September on record averaged 1.6 m/s (2004).
The wettest September on record was 2004 with 269 mm. On average, September sees 90 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 Grovetown 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.
