September is one of the warmer months of the year in Collierville, with average highs near 30.3°C and lows around 17.3°C (mean 23.8°C). It is one of the drier months, averaging 88 mm of rainfall and 65% relative humidity across the period.
September is one of the warmer months of the year in Collierville. Across 45 years of records, the warmest September in Collierville was 2019 — when the month averaged 28.5°C — while the coldest was 1996 at 21.9°C. Typical September days reach 30.3°C with nights near 17.3°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Collierville, averaging 88 mm of rainfall. The wettest September on record was 2002 with 234 mm, while the driest was 2019 at 14 mm.
Relative humidity in Collierville during September averages 65%. The most humid September was 2009 at 81%, and the least humid was 1999 at 40%.
September receives about 4.9 kWh/m²/day of solar energy in Collierville. The sunniest Septembers were 1999, 2004 and 2019 at 5.4 kWh/m²/day, and the cloudiest was 2009 at 4.
Average wind speed in Collierville during September is 1.3 m/s. The windiest Septembers were 2000 and 2008 at 1.6 m/s, while the calmest was 2025 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.5°C | 23.6°C | 23.6°C | 24.6°C | 23.8°C | +0.3°C |
| Avg High | 30.0°C | 30.5°C | 29.8°C | 31.0°C | 30.1°C | +0.1°C |
| Avg Low | 17.0°C | 16.8°C | 17.3°C | 18.2°C | 17.6°C | +0.6°C |
| Avg Rain | 83 mm | 82 mm | 104 mm | 81 mm | 92 mm | +9 mm |
September temperatures in Collierville have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.8°C (1989) to a record high of 41°C (1990).
Rainfall in September is one of the drier months, averaging 88 mm, with a wettest year of 234 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Collierville
September is one of the best times to visit Collierville. Expect days averaging 30.3°C and nights around 17.3°C (mean 23.8°C) — warmer than Collierville's yearly average — with higher rainfall (88 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 | 32.7°C | 25.6°C | 18.6°C | 37.4°C | 12.0°C | 98 mm | 59% | 1 m/s | 5.1 |
| 2024 | 28.4°C | 23.2°C | 17.9°C | 34.2°C | 10.8°C | 212 mm | 73% | 1.3 m/s | 4.1 |
| 2023 | 32.2°C | 25.1°C | 18.1°C | 34.9°C | 13.4°C | 33 mm | 60% | 1.1 m/s | 5.2 |
| 2022 | 30.4°C | 23.6°C | 16.7°C | 38.0°C | 8.6°C | 40 mm | 63% | 1.2 m/s | 5.3 |
| 2021 | 29.4°C | 23.2°C | 17.0°C | 31.9°C | 10.4°C | 79 mm | 73% | 1.1 m/s | 4.9 |
| 2020 | 27.7°C | 22.4°C | 17.0°C | 32.5°C | 9.6°C | 89 mm | 79% | 1.3 m/s | 4.4 |
| 2019 🔥 | 35.6°C | 28.5°C | 21.4°C | 38.4°C | 18.5°C | 14 mm | 57% | 1.1 m/s | 5.4 |
| 2018 | 30.8°C | 25.6°C | 20.4°C | 37.1°C | 15.3°C | 170 mm | 74% | 1.2 m/s | 4.5 |
| 2017 | 28.0°C | 22.4°C | 16.7°C | 32.8°C | 10.1°C | 50 mm | 75% | 1.1 m/s | 5.2 |
| 2016 | 32.9°C | 26.2°C | 19.5°C | 36.6°C | 11.4°C | 27 mm | 64% | 1.2 m/s | 5.3 |
| 2015 | 31.5°C | 24.6°C | 17.7°C | 36.7°C | 9.8°C | 37 mm | 64% | 1.1 m/s | 5.1 |
| 2014 | 29.3°C | 23.4°C | 17.5°C | 35.1°C | 9.6°C | 91 mm | 72% | 1.2 m/s | 4.8 |
| 2013 | 31.3°C | 24.7°C | 18.1°C | 37.1°C | 10.9°C | 116 mm | 66% | 1.2 m/s | 5 |
| 2012 | 29.3°C | 23.0°C | 16.7°C | 36.9°C | 8.3°C | 139 mm | 68% | 1.3 m/s | 4.8 |
| 2011 | 28.5°C | 22.2°C | 15.8°C | 38.8°C | 11.2°C | 126 mm | 63% | 1.5 m/s | 4.9 |
| 2010 | 32.6°C | 25.2°C | 17.9°C | 37.8°C | 10.7°C | 35 mm | 56% | 1.3 m/s | 5.2 |
| 2009 | 27.8°C | 23.1°C | 18.4°C | 33.1°C | 8.6°C | 211 mm | 81% | 1.1 m/s | 4 |
| 2008 | 29.9°C | 23.7°C | 17.5°C | 34.5°C | 12.4°C | 61 mm | 68% | 1.6 m/s | 4.6 |
| 2007 | 31.5°C | 25.3°C | 19.0°C | 35.9°C | 11.5°C | 82 mm | 64% | 1.2 m/s | 4.7 |
| 2006 | 28.5°C | 22.0°C | 15.5°C | 32.8°C | 9.2°C | 107 mm | 67% | 1.4 m/s | 4.9 |
| 2005 | 31.5°C | 25.0°C | 18.4°C | 36.8°C | 7.1°C | 86 mm | 66% | 1.3 m/s | 5.3 |
| 2004 | 30.0°C | 23.3°C | 16.6°C | 33.5°C | 9.3°C | 23 mm | 64% | 1.4 m/s | 5.4 |
| 2003 | 28.5°C | 22.2°C | 15.8°C | 33.0°C | 6.3°C | 105 mm | 69% | 1.3 m/s | 5.1 |
| 2002 🌧️ | 31.1°C | 24.8°C | 18.4°C | 36.9°C | 9.8°C | 234 mm | 68% | 1.3 m/s | 4.8 |
| 2001 | 28.4°C | 22.2°C | 15.9°C | 33.2°C | 6.4°C | 85 mm | 67% | 1.3 m/s | 5.1 |
| 2000 | 31.0°C | 24.2°C | 17.3°C | 39.7°C | 6.5°C | 48 mm | 56% | 1.6 m/s | 4.8 |
| 1999 | 32.0°C | 24.5°C | 17.0°C | 38.9°C | 7.9°C | 28 mm | 40% | 1.4 m/s | 5.4 |
| 1998 | 34.3°C | 27.1°C | 19.8°C | 38.5°C | 13.0°C | 26 mm | 54% | 1.3 m/s | 5.3 |
| 1997 | 30.0°C | 23.2°C | 16.4°C | 35.6°C | 10.0°C | 121 mm | 67% | 1.2 m/s | 5 |
| 1996 ❄️ | 28.1°C | 21.9°C | 15.6°C | 33.2°C | 8.3°C | 186 mm | 71% | 1.3 m/s | 4.9 |
| 1995 | 30.6°C | 23.1°C | 15.7°C | 35.2°C | 6.6°C | 33 mm | 58% | 1.3 m/s | 4.8 |
| 1994 | 30.1°C | 22.4°C | 14.8°C | 34.3°C | 7.3°C | 49 mm | 62% | 1.2 m/s | 5.1 |
| 1993 | 29.1°C | 22.4°C | 15.6°C | 34.0°C | 7.7°C | 137 mm | 68% | 1.4 m/s | 4.5 |
| 1992 | 28.1°C | 22.0°C | 16.0°C | 33.5°C | 6.0°C | 111 mm | 74% | 1.4 m/s | 4.3 |
| 1991 | 29.3°C | 23.4°C | 17.6°C | 35.1°C | 5.5°C | 66 mm | 67% | 1.1 m/s | 4.9 |
| 1990 | 32.9°C | 26.4°C | 19.8°C | 41.0°C | 7.2°C | 60 mm | 57% | 1.1 m/s | 4.7 |
| 1989 | 28.1°C | 22.2°C | 16.4°C | 34.6°C | 4.8°C | 156 mm | 75% | 1.3 m/s | 4.2 |
| 1988 | 30.0°C | 24.2°C | 18.3°C | 36.0°C | 8.9°C | 166 mm | 71% | 1.4 m/s | 4.5 |
| 1987 | 31.3°C | 24.3°C | 17.4°C | 35.8°C | 12.4°C | 64 mm | 56% | 1.2 m/s | 4.9 |
| 1986 | 32.0°C | 25.9°C | 19.8°C | 35.4°C | 13.8°C | 49 mm | 65% | 1.4 m/s | 4.7 |
| 1985 | 29.2°C | 22.7°C | 16.1°C | 33.4°C | 7.2°C | 99 mm | 65% | 1.5 m/s | 4.9 |
| 1984 | 29.5°C | 22.5°C | 15.5°C | 37.0°C | 7.2°C | 50 mm | 60% | 1.5 m/s | 4.7 |
| 1983 | 30.9°C | 24.2°C | 17.6°C | 37.0°C | 5.8°C | 57 mm | 56% | 1.4 m/s | — |
| 1982 | 29.4°C | 22.9°C | 16.3°C | 34.2°C | 6.8°C | 68 mm | 66% | 1.3 m/s | — |
| 1981 | 29.2°C | 22.2°C | 15.2°C | 33.7°C | 7.5°C | 36 mm | 62% | 1.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.3°C with lows near 17.3°C (mean 23.8°C), based on 45 years of NASA POWER data.
September averages 88 mm of rainfall in Collierville, one of the drier months. The wettest on record was 234 mm in 2002.
The hottest September reached 41°C in 1990. The coldest dipped to 4.8°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 29.6°C to 30.6°C and overnight lows from 16.1°C to 17.7°C over the same span.
September is one of the warmer months of the year in Collierville and one of the drier months, so plan for around 30.3°C daytime highs and 17.3°C at night.
Not quite — September is the 9th coolest month in Collierville, averaging 23.8°C.
For September in Collierville, pack light, breathable clothing and sun protection, with typical highs of 30.3°C and lows of 17.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 65% — moderately humid.
Average wind speed in September is 1.3 m/s. The windiest September on record averaged 1.6 m/s (2000).
The wettest September on record was 2002 with 234 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 Collierville 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.
