September is one of the warmer months of the year in Carrollton, with average highs near 29.9°C and lows around 16.7°C (mean 23.3°C). It is one of the drier months, averaging 88 mm of rainfall and 71% relative humidity across the period.
September is one of the warmer months of the year in Carrollton. Across 45 years of records, the warmest September in Carrollton was 2019 — when the month averaged 27.6°C — while the coldest was 1994 at 21°C. Typical September days reach 29.9°C with nights near 16.7°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Carrollton, averaging 88 mm of rainfall. The wettest September on record was 2004 with 219 mm, while the driest was 1984 at 7 mm.
Relative humidity in Carrollton during September averages 71%. The most humid September was 1992 at 83%, and the least humid was 1999 at 55%.
September receives about 4.8 kWh/m²/day of solar energy in Carrollton. The sunniest September was 2019 at 5.8 kWh/m²/day, and the cloudiest were 1988 and 2009 at 3.7.
Average wind speed in Carrollton during September is 0.1 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2006, 2008 and 2020, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.4°C | 23.2°C | 23.0°C | 24.3°C | 23.5°C | +1.1°C |
| Avg High | 28.9°C | 30.0°C | 29.3°C | 31.1°C | 30.0°C | +1.1°C |
| Avg Low | 16.0°C | 16.4°C | 16.7°C | 17.6°C | 17.0°C | +1°C |
| Avg Rain | 87 mm | 89 mm | 97 mm | 72 mm | 100 mm | +12 mm |
September temperatures in Carrollton have risen by about 1.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.3°C (1983) to a record high of 39.1°C (2019).
Rainfall in September is one of the drier months, averaging 88 mm, with a wettest year of 219 mm.
One of the best times to visit Carrollton
September is one of the best times to visit Carrollton. Expect days averaging 29.9°C and nights around 16.7°C (mean 23.3°C) — warmer than Carrollton'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 | 32.0°C | 24.7°C | 17.4°C | 35.3°C | 13.3°C | 38 mm | 64% | 0.1 m/s | 5.3 |
| 2024 | 30.9°C | 24.6°C | 18.4°C | 36.7°C | 14.4°C | 219 mm | 70% | 0.1 m/s | 4.1 |
| 2023 | 31.0°C | 23.9°C | 16.9°C | 35.6°C | 11.3°C | 43 mm | 67% | 0.1 m/s | 5.1 |
| 2022 | 29.5°C | 22.6°C | 15.7°C | 35.5°C | 8.1°C | 62 mm | 70% | 0.1 m/s | 5.3 |
| 2021 | 28.7°C | 22.6°C | 16.6°C | 32.7°C | 8.5°C | 82 mm | 76% | 0.1 m/s | 4.8 |
| 2020 | 28.0°C | 22.4°C | 16.8°C | 34.6°C | 7.7°C | 155 mm | 77% | 0 m/s | 4.6 |
| 2019 🔥 | 35.5°C | 27.6°C | 19.7°C | 39.1°C | 14.9°C | 22 mm | 58% | 0.1 m/s | 5.8 |
| 2018 | 32.6°C | 26.3°C | 20.1°C | 36.1°C | 18.0°C | 69 mm | 72% | 0.1 m/s | 4.8 |
| 2017 | 28.9°C | 22.3°C | 15.8°C | 33.2°C | 10.2°C | 116 mm | 71% | 0.1 m/s | 5.2 |
| 2016 | 32.8°C | 25.8°C | 18.8°C | 36.4°C | 9.3°C | 51 mm | 65% | 0.1 m/s | 5.4 |
| 2015 | 29.1°C | 23.1°C | 17.1°C | 36.2°C | 9.3°C | 94 mm | 75% | 0.1 m/s | 4.7 |
| 2014 | 31.0°C | 24.6°C | 18.2°C | 35.6°C | 11.4°C | 55 mm | 72% | 0.1 m/s | 4.6 |
| 2013 | 29.2°C | 22.9°C | 16.5°C | 32.4°C | 11.3°C | 62 mm | 77% | 0.1 m/s | 5.1 |
| 2012 | 29.9°C | 23.1°C | 16.2°C | 36.1°C | 8.0°C | 79 mm | 71% | 0.1 m/s | 4.7 |
| 2011 | 28.7°C | 22.4°C | 16.0°C | 36.7°C | 11.6°C | 124 mm | 72% | 0.1 m/s | 4.5 |
| 2010 | 33.2°C | 25.3°C | 17.4°C | 36.9°C | 11.0°C | 52 mm | 61% | 0.1 m/s | 5.6 |
| 2009 | 27.7°C | 22.8°C | 17.9°C | 31.4°C | 8.3°C | 195 mm | 83% | 0.1 m/s | 3.7 |
| 2008 | 29.8°C | 23.4°C | 16.9°C | 34.1°C | 10.2°C | 21 mm | 72% | 0 m/s | 4.8 |
| 2007 | 31.4°C | 24.4°C | 17.4°C | 35.6°C | 9.9°C | 59 mm | 66% | 0.1 m/s | 5 |
| 2006 | 29.3°C | 22.4°C | 15.6°C | 34.5°C | 8.3°C | 92 mm | 70% | 0 m/s | 5 |
| 2005 | 31.4°C | 24.4°C | 17.3°C | 35.2°C | 14.2°C | 17 mm | 69% | 0.1 m/s | 5.3 |
| 2004 🌧️ | 27.1°C | 21.8°C | 16.6°C | 32.0°C | 10.8°C | 219 mm | 80% | 0 m/s | 4.5 |
| 2003 | 27.8°C | 21.6°C | 15.4°C | 32.8°C | 6.2°C | 45 mm | 77% | 0.1 m/s | 5.2 |
| 2002 | 30.9°C | 25.0°C | 19.1°C | 36.8°C | 15.4°C | 170 mm | 74% | 0 m/s | 3.9 |
| 2001 | 28.8°C | 21.8°C | 14.8°C | 33.3°C | 5.6°C | 71 mm | 68% | 0.1 m/s | 4.9 |
| 2000 | 28.8°C | 22.3°C | 15.8°C | 33.6°C | 7.1°C | 83 mm | 72% | 0.1 m/s | 4.3 |
| 1999 | 31.1°C | 23.0°C | 14.9°C | 37.1°C | 5.9°C | 49 mm | 55% | 0.1 m/s | 5 |
| 1998 | 31.9°C | 25.0°C | 18.0°C | 36.9°C | 11.4°C | 59 mm | 67% | 0.1 m/s | 4.8 |
| 1997 | 31.1°C | 24.0°C | 17.0°C | 36.3°C | 11.2°C | 144 mm | 65% | 0.1 m/s | 5 |
| 1996 | 28.8°C | 22.3°C | 15.8°C | 33.9°C | 9.6°C | 126 mm | 72% | 0.1 m/s | 4.6 |
| 1995 | 29.5°C | 22.9°C | 16.4°C | 35.3°C | 10.8°C | 87 mm | 73% | 0 m/s | 4.6 |
| 1994 ❄️ | 26.9°C | 21.0°C | 15.1°C | 31.6°C | 8.4°C | 123 mm | 81% | 0.1 m/s | 4.9 |
| 1993 | 31.4°C | 24.1°C | 16.7°C | 34.9°C | 6.3°C | 52 mm | 65% | 0.1 m/s | 4.9 |
| 1992 | 27.5°C | 22.3°C | 17.0°C | 31.1°C | 8.9°C | 102 mm | 83% | 0.1 m/s | 4.1 |
| 1991 | 29.3°C | 22.9°C | 16.4°C | 37.1°C | 6.6°C | 88 mm | 73% | 0 m/s | 4.9 |
| 1990 | 32.4°C | 24.8°C | 17.2°C | 38.0°C | 6.4°C | 56 mm | 61% | 0.1 m/s | 5.1 |
| 1989 | 27.0°C | 21.7°C | 16.4°C | 32.9°C | 9.7°C | 174 mm | 82% | 0.1 m/s | 3.8 |
| 1988 | 27.9°C | 22.4°C | 17.0°C | 32.8°C | 12.4°C | 182 mm | 81% | 0 m/s | 3.7 |
| 1987 | 30.0°C | 23.3°C | 16.6°C | 34.0°C | 10.0°C | 67 mm | 68% | 0.1 m/s | 4.6 |
| 1986 | 29.9°C | 24.1°C | 18.2°C | 34.5°C | 13.6°C | 68 mm | 77% | 0.1 m/s | 4.4 |
| 1985 | 29.2°C | 22.2°C | 15.2°C | 33.6°C | 6.8°C | 76 mm | 69% | 0.1 m/s | 4.9 |
| 1984 | 28.9°C | 21.7°C | 14.6°C | 35.3°C | 9.8°C | 7 mm | 67% | 0.1 m/s | 5.1 |
| 1983 | 27.5°C | 21.5°C | 15.6°C | 36.1°C | 5.3°C | 122 mm | 74% | 0.1 m/s | — |
| 1982 | 29.3°C | 22.3°C | 15.4°C | 34.2°C | 6.6°C | 46 mm | 67% | 0.1 m/s | — |
| 1981 | 30.4°C | 22.7°C | 15.0°C | 34.4°C | 7.3°C | 45 mm | 62% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.9°C with lows near 16.7°C (mean 23.3°C), based on 45 years of NASA POWER data.
September averages 88 mm of rainfall in Carrollton, one of the drier months. The wettest on record was 219 mm in 2004.
The hottest September reached 39.1°C in 2019. The coldest dipped to 5.3°C in 1983.
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 29.1°C to 30.4°C and overnight lows from 15.2°C to 17°C over the same span.
September is one of the warmer months of the year in Carrollton and one of the drier months, so plan for around 29.9°C daytime highs and 16.7°C at night.
Not quite — September is the 9th coolest month in Carrollton, averaging 23.3°C.
For September in Carrollton, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 16.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.1 m/s (1981).
The wettest September on record was 2004 with 219 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 Carrollton 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.
