September is one of the warmer months of the year in Conroe, with average highs near 32.8°C and lows around 20.7°C (mean 26.8°C). It is about average for rainfall, averaging 94 mm of rainfall and 71% relative humidity across the period.
September is one of the warmer months of the year in Conroe. Across 45 years of records, the warmest September in Conroe was 2023 — when the month averaged 30.4°C — while the coldest was 2003 at 24.1°C. Typical September days reach 32.8°C with nights near 20.7°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Conroe, averaging 94 mm of rainfall. The wettest September on record was 1998 with 224 mm, while the driest was 2025 at 22 mm.
Relative humidity in Conroe during September averages 71%. The most humid September was 1986 at 83%, and the least humid was 2011 at 53%.
September receives about 5.2 kWh/m²/day of solar energy in Conroe. The sunniest September was 2011 at 5.9 kWh/m²/day, and the cloudiest was 2018 at 4.
Average wind speed in Conroe during September is 0.8 m/s. The windiest Septembers were 1985, 1988 and 2020, among others at 1 m/s, while the calmest were 2007, 2016 and 2022, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.0°C | 26.4°C | 26.2°C | 27.3°C | 28.1°C | +2.1°C |
| Avg High | 32.1°C | 32.5°C | 32.0°C | 33.2°C | 34.7°C | +2.6°C |
| Avg Low | 20.0°C | 20.4°C | 20.5°C | 21.4°C | 21.4°C | +1.4°C |
| Avg Rain | 86 mm | 104 mm | 104 mm | 99 mm | 63 mm | -23 mm |
September temperatures in Conroe have risen by about 2.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7°C (1983) to a record high of 44.6°C (2000).
Rainfall in September is about average for rainfall, averaging 94 mm, with a wettest year of 224 mm.
One of the best times to visit Conroe
September is one of the best times to visit Conroe. Expect days averaging 32.8°C and nights around 20.7°C (mean 26.8°C) — warmer than Conroe's yearly average — with higher rainfall (94 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 | 35.5°C | 28.4°C | 21.3°C | 38.5°C | 15.7°C | 22 mm | 63% | 0.7 m/s | 5.7 |
| 2024 | 34.8°C | 28.1°C | 21.4°C | 38.5°C | 15.7°C | 48 mm | 69% | 0.8 m/s | 5.3 |
| 2023 🔥 | 37.3°C | 30.4°C | 23.4°C | 43.7°C | 19.0°C | 62 mm | 60% | 0.7 m/s | 5.4 |
| 2022 | 34.7°C | 27.7°C | 20.6°C | 38.3°C | 12.7°C | 34 mm | 65% | 0.6 m/s | 5.8 |
| 2021 | 34.2°C | 27.5°C | 20.8°C | 38.2°C | 12.9°C | 82 mm | 66% | 0.8 m/s | 5.4 |
| 2020 | 31.8°C | 26.4°C | 21.0°C | 35.8°C | 10.9°C | 131 mm | 74% | 1 m/s | 4.4 |
| 2019 | 35.7°C | 29.4°C | 23.2°C | 40.1°C | 20.9°C | 123 mm | 69% | 0.9 m/s | 5.3 |
| 2018 | 31.4°C | 27.0°C | 22.5°C | 36.1°C | 17.9°C | 176 mm | 82% | 0.7 m/s | 4 |
| 2017 | 30.1°C | 24.8°C | 19.6°C | 33.0°C | 13.9°C | 40 mm | 80% | 0.7 m/s | 5.7 |
| 2016 | 32.3°C | 27.1°C | 21.9°C | 35.7°C | 12.8°C | 67 mm | 79% | 0.6 m/s | 5.5 |
| 2015 | 33.6°C | 27.4°C | 21.3°C | 37.4°C | 14.6°C | 62 mm | 70% | 0.7 m/s | 5.3 |
| 2014 | 32.2°C | 26.8°C | 21.5°C | 37.5°C | 14.6°C | 119 mm | 77% | 0.7 m/s | 4.9 |
| 2013 | 33.9°C | 28.0°C | 22.1°C | 38.9°C | 15.3°C | 149 mm | 70% | 0.8 m/s | 5 |
| 2012 | 33.7°C | 27.0°C | 20.3°C | 39.4°C | 13.6°C | 110 mm | 68% | 0.8 m/s | 5.4 |
| 2011 | 36.1°C | 28.2°C | 20.3°C | 40.9°C | 14.2°C | 38 mm | 53% | 0.9 m/s | 5.9 |
| 2010 | 33.4°C | 27.6°C | 21.8°C | 36.7°C | 12.3°C | 103 mm | 72% | 0.8 m/s | 5.1 |
| 2009 | 31.3°C | 26.0°C | 20.8°C | 36.8°C | 15.6°C | 107 mm | 76% | 0.7 m/s | 4.1 |
| 2008 | 30.1°C | 24.5°C | 18.9°C | 36.5°C | 13.6°C | 170 mm | 76% | 0.9 m/s | 5.3 |
| 2007 | 32.3°C | 26.9°C | 21.5°C | 34.4°C | 17.4°C | 52 mm | 77% | 0.6 m/s | 5.2 |
| 2006 | 32.5°C | 26.2°C | 19.8°C | 36.3°C | 12.9°C | 85 mm | 69% | 0.8 m/s | 5.1 |
| 2005 | 35.9°C | 29.3°C | 22.8°C | 40.1°C | 18.5°C | 66 mm | 66% | 0.9 m/s | 5.3 |
| 2004 | 33.7°C | 27.4°C | 21.0°C | 38.7°C | 16.3°C | 41 mm | 67% | 0.7 m/s | 5.4 |
| 2003 ❄️ | 29.0°C | 24.1°C | 19.3°C | 31.9°C | 11.9°C | 158 mm | 80% | 0.7 m/s | 5 |
| 2002 | 31.8°C | 26.2°C | 20.7°C | 37.0°C | 15.6°C | 125 mm | 74% | 0.9 m/s | 4.8 |
| 2001 | 29.4°C | 24.5°C | 19.6°C | 33.8°C | 10.1°C | 140 mm | 82% | 0.7 m/s | 5.2 |
| 2000 | 34.2°C | 27.3°C | 20.4°C | 44.6°C | 9.5°C | 91 mm | 61% | 0.9 m/s | 5.4 |
| 1999 | 33.9°C | 26.8°C | 19.6°C | 38.6°C | 11.6°C | 70 mm | 60% | 0.8 m/s | 5.7 |
| 1998 🌧️ | 32.6°C | 27.8°C | 23.0°C | 39.0°C | 20.3°C | 224 mm | 79% | 0.8 m/s | 4.9 |
| 1997 | 34.0°C | 27.4°C | 20.9°C | 37.7°C | 15.2°C | 117 mm | 68% | 0.8 m/s | 5.4 |
| 1996 | 30.0°C | 24.8°C | 19.6°C | 33.6°C | 9.5°C | 177 mm | 79% | 0.7 m/s | 5.1 |
| 1995 | 33.5°C | 27.0°C | 20.5°C | 39.5°C | 10.1°C | 76 mm | 70% | 0.7 m/s | 5.3 |
| 1994 | 31.6°C | 25.3°C | 18.9°C | 35.6°C | 8.7°C | 65 mm | 71% | 0.7 m/s | 5.4 |
| 1993 | 34.3°C | 27.1°C | 19.9°C | 38.3°C | 12.6°C | 38 mm | 62% | 0.9 m/s | 5.2 |
| 1992 | 32.9°C | 27.0°C | 21.0°C | 35.9°C | 10.8°C | 63 mm | 69% | 0.9 m/s | 5 |
| 1991 | 29.3°C | 24.2°C | 19.2°C | 33.3°C | 10.8°C | 123 mm | 81% | 0.7 m/s | 4.8 |
| 1990 | 32.6°C | 26.9°C | 21.2°C | 38.1°C | 11.9°C | 87 mm | 71% | 0.6 m/s | 4.8 |
| 1989 | 32.1°C | 25.2°C | 18.3°C | 38.8°C | 9.2°C | 49 mm | 66% | 0.8 m/s | 5.4 |
| 1988 | 34.4°C | 27.5°C | 20.7°C | 37.3°C | 15.2°C | 47 mm | 65% | 1 m/s | 5 |
| 1987 | 32.5°C | 26.2°C | 19.9°C | 37.1°C | 13.4°C | 92 mm | 69% | 0.8 m/s | 5.2 |
| 1986 | 31.1°C | 26.8°C | 22.6°C | 34.6°C | 20.8°C | 144 mm | 83% | 0.8 m/s | 4.5 |
| 1985 | 32.6°C | 26.6°C | 20.6°C | 41.2°C | 9.2°C | 128 mm | 68% | 1 m/s | 5 |
| 1984 | 31.8°C | 25.6°C | 19.5°C | 36.7°C | 9.2°C | 66 mm | 68% | 1 m/s | 4.7 |
| 1983 | 29.5°C | 24.2°C | 18.9°C | 33.6°C | 7.0°C | 137 mm | 80% | 0.8 m/s | — |
| 1982 | 34.2°C | 27.2°C | 20.2°C | 39.0°C | 11.1°C | 47 mm | 63% | 0.8 m/s | — |
| 1981 | 30.4°C | 24.8°C | 19.1°C | 33.6°C | 9.9°C | 64 mm | 76% | 0.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 32.8°C with lows near 20.7°C (mean 26.8°C), based on 45 years of NASA POWER data.
September averages 94 mm of rainfall in Conroe, about average for rainfall. The wettest on record was 224 mm in 1998.
The hottest September reached 44.6°C in 2000. 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 2.7°C. Daytime highs moved from 31.7°C to 35.3°C and overnight lows from 19.7°C to 21.5°C over the same span.
September is one of the warmer months of the year in Conroe and about average for rainfall, so plan for around 32.8°C daytime highs and 20.7°C at night.
Not quite — September is the 9th coolest month in Conroe, averaging 26.8°C.
For September in Conroe, pack light, breathable clothing and sun protection, with typical highs of 32.8°C and lows of 20.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 0.8 m/s. The windiest September on record averaged 1 m/s (1984).
The wettest September on record was 1998 with 224 mm. On average, September sees 94 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 Conroe 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.
