September is one of the warmer months of the year in Bryan, with average highs near 32.9°C and lows around 21°C (mean 27°C). It is about average for rainfall, averaging 82 mm of rainfall and 68% relative humidity across the period.
September is one of the warmer months of the year in Bryan. Across 45 years of records, the warmest September in Bryan was 2023 — when the month averaged 30.7°C — while the coldest were 2001 and 2003 at 24.2°C. Typical September days reach 32.9°C with nights near 21°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Bryan, averaging 82 mm of rainfall. The wettest September on record was 1998 with 204 mm, while the driest was 2025 at 15 mm.
Relative humidity in Bryan during September averages 68%. The most humid September was 1986 at 82%, and the least humid was 2011 at 48%.
September receives about 5.2 kWh/m²/day of solar energy in Bryan. The sunniest September was 2011 at 6 kWh/m²/day, and the cloudiest was 2009 at 4.1.
Average wind speed in Bryan during September is 1.9 m/s. The windiest September was 1984 at 2.6 m/s, while the calmest was 2022 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.4°C | 26.7°C | 26.4°C | 27.5°C | 28.2°C | +1.8°C |
| Avg High | 32.4°C | 32.5°C | 32.2°C | 33.3°C | 34.7°C | +2.3°C |
| Avg Low | 20.3°C | 20.8°C | 20.7°C | 21.8°C | 21.8°C | +1.5°C |
| Avg Rain | 75 mm | 94 mm | 87 mm | 85 mm | 60 mm | -15 mm |
September temperatures in Bryan have risen by about 2.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7.2°C (1983) to a record high of 45°C (2000).
Rainfall in September is about average for rainfall, averaging 82 mm, with a wettest year of 204 mm.
One of the best times to visit Bryan
September is one of the best times to visit Bryan. Expect days averaging 32.9°C and nights around 21°C (mean 27°C) — warmer than Bryan's yearly average — with higher rainfall (82 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 | 36.0°C | 29.0°C | 21.9°C | 38.6°C | 16.3°C | 15 mm | 56% | 1.6 m/s | 5.8 |
| 2024 | 35.8°C | 28.9°C | 22.1°C | 39.3°C | 16.8°C | 35 mm | 61% | 2.1 m/s | 5.5 |
| 2023 🔥 | 37.3°C | 30.7°C | 24.1°C | 43.8°C | 19.6°C | 51 mm | 57% | 1.7 m/s | 5.6 |
| 2022 | 34.0°C | 27.4°C | 20.8°C | 37.8°C | 13.4°C | 37 mm | 65% | 1.3 m/s | 5.9 |
| 2021 | 34.6°C | 28.0°C | 21.3°C | 38.8°C | 14.3°C | 66 mm | 61% | 1.9 m/s | 5.6 |
| 2020 | 30.3°C | 25.4°C | 20.6°C | 35.2°C | 11.2°C | 154 mm | 76% | 2.5 m/s | 4.5 |
| 2019 | 36.6°C | 30.3°C | 23.9°C | 40.5°C | 21.7°C | 55 mm | 63% | 2.2 m/s | 5.5 |
| 2018 | 31.5°C | 27.0°C | 22.5°C | 37.1°C | 17.2°C | 168 mm | 79% | 1.7 m/s | 4.2 |
| 2017 | 29.5°C | 24.5°C | 19.6°C | 31.7°C | 13.4°C | 41 mm | 81% | 1.6 m/s | 5.7 |
| 2016 | 31.5°C | 26.7°C | 21.9°C | 34.3°C | 13.1°C | 56 mm | 79% | 1.5 m/s | 5.5 |
| 2015 | 34.1°C | 28.0°C | 21.9°C | 37.6°C | 16.5°C | 46 mm | 66% | 1.7 m/s | 5.4 |
| 2014 | 32.4°C | 27.0°C | 21.7°C | 38.0°C | 14.6°C | 118 mm | 74% | 1.8 m/s | 5 |
| 2013 | 34.1°C | 28.3°C | 22.6°C | 38.8°C | 15.2°C | 119 mm | 65% | 1.9 m/s | 5.1 |
| 2012 | 33.8°C | 27.1°C | 20.5°C | 39.7°C | 14.7°C | 107 mm | 65% | 2 m/s | 5.4 |
| 2011 | 36.4°C | 28.8°C | 21.1°C | 41.2°C | 15.5°C | 32 mm | 48% | 2.3 m/s | 6 |
| 2010 | 33.1°C | 27.5°C | 21.9°C | 35.8°C | 12.4°C | 107 mm | 71% | 2 m/s | 5.1 |
| 2009 | 30.4°C | 25.6°C | 20.9°C | 36.7°C | 15.8°C | 146 mm | 76% | 1.8 m/s | 4.1 |
| 2008 | 30.7°C | 24.9°C | 19.1°C | 36.4°C | 13.8°C | 108 mm | 72% | 2.1 m/s | 5.4 |
| 2007 | 32.5°C | 27.1°C | 21.8°C | 34.8°C | 18.5°C | 43 mm | 74% | 1.6 m/s | 5.2 |
| 2006 | 33.0°C | 26.7°C | 20.4°C | 37.1°C | 13.8°C | 83 mm | 64% | 2.1 m/s | 5.1 |
| 2005 | 36.2°C | 29.7°C | 23.3°C | 41.3°C | 20.0°C | 30 mm | 62% | 2.1 m/s | 5.4 |
| 2004 | 33.7°C | 27.4°C | 21.2°C | 37.8°C | 16.5°C | 31 mm | 64% | 1.8 m/s | 5.2 |
| 2003 | 29.2°C | 24.2°C | 19.3°C | 32.5°C | 12.4°C | 147 mm | 78% | 1.7 m/s | 5 |
| 2002 | 32.7°C | 26.8°C | 20.9°C | 37.5°C | 15.6°C | 87 mm | 68% | 2.3 m/s | 5 |
| 2001 ❄️ | 28.9°C | 24.2°C | 19.6°C | 32.7°C | 10.2°C | 125 mm | 81% | 1.7 m/s | 5.4 |
| 2000 | 34.3°C | 27.6°C | 20.8°C | 45.0°C | 9.5°C | 72 mm | 57% | 2.1 m/s | 5.5 |
| 1999 | 34.7°C | 27.7°C | 20.6°C | 39.7°C | 11.4°C | 38 mm | 52% | 2.2 m/s | 5.8 |
| 1998 🌧️ | 32.3°C | 27.7°C | 23.0°C | 38.5°C | 19.9°C | 204 mm | 78% | 1.8 m/s | 4.9 |
| 1997 | 34.6°C | 28.2°C | 21.7°C | 38.8°C | 15.5°C | 96 mm | 62% | 2 m/s | 5.5 |
| 1996 | 29.4°C | 24.6°C | 19.8°C | 32.6°C | 10.0°C | 137 mm | 79% | 1.6 m/s | 5.1 |
| 1995 | 33.3°C | 27.0°C | 20.8°C | 39.5°C | 9.6°C | 89 mm | 67% | 1.8 m/s | 5.2 |
| 1994 | 31.5°C | 25.3°C | 19.1°C | 35.3°C | 8.7°C | 61 mm | 68% | 1.7 m/s | 5.6 |
| 1993 | 34.2°C | 27.3°C | 20.4°C | 38.6°C | 13.4°C | 41 mm | 58% | 2.2 m/s | 5.3 |
| 1992 | 33.4°C | 27.4°C | 21.4°C | 36.4°C | 11.4°C | 51 mm | 66% | 2.3 m/s | 5.3 |
| 1991 | 29.6°C | 24.6°C | 19.5°C | 33.4°C | 11.2°C | 119 mm | 78% | 1.7 m/s | 4.8 |
| 1990 | 32.0°C | 26.8°C | 21.5°C | 38.2°C | 12.0°C | 100 mm | 71% | 1.5 m/s | 4.9 |
| 1989 | 32.7°C | 25.7°C | 18.8°C | 39.8°C | 9.1°C | 40 mm | 60% | 2.1 m/s | 5.6 |
| 1988 | 35.2°C | 28.3°C | 21.5°C | 37.9°C | 15.6°C | 38 mm | 58% | 2.5 m/s | 5.1 |
| 1987 | 32.8°C | 26.5°C | 20.3°C | 37.1°C | 13.8°C | 78 mm | 66% | 1.9 m/s | 5.3 |
| 1986 | 31.0°C | 26.8°C | 22.6°C | 33.2°C | 20.8°C | 125 mm | 82% | 2.2 m/s | 4.7 |
| 1985 | 33.0°C | 27.0°C | 20.9°C | 41.7°C | 8.5°C | 117 mm | 64% | 2.5 m/s | 5.1 |
| 1984 | 32.2°C | 26.0°C | 19.7°C | 36.9°C | 8.8°C | 50 mm | 64% | 2.6 m/s | 4.9 |
| 1983 | 30.2°C | 24.7°C | 19.1°C | 33.9°C | 7.2°C | 111 mm | 76% | 2.1 m/s | — |
| 1982 | 34.3°C | 27.4°C | 20.6°C | 39.7°C | 11.6°C | 47 mm | 60% | 2 m/s | — |
| 1981 | 30.5°C | 25.0°C | 19.4°C | 33.0°C | 10.1°C | 69 mm | 73% | 1.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 32.9°C with lows near 21°C (mean 27°C), based on 45 years of NASA POWER data.
September averages 82 mm of rainfall in Bryan, about average for rainfall. The wettest on record was 204 mm in 1998.
The hottest September reached 45°C in 2000. The coldest dipped to 7.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.8°C. Daytime highs moved from 32°C to 35.5°C and overnight lows from 19.9°C to 22°C over the same span.
September is one of the warmer months of the year in Bryan and about average for rainfall, so plan for around 32.9°C daytime highs and 21°C at night.
Not quite — September is the 9th coolest month in Bryan, averaging 27°C.
For September in Bryan, pack light, breathable clothing and sun protection, with typical highs of 32.9°C and lows of 21°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.6 m/s (1984).
The wettest September on record was 1998 with 204 mm. On average, September sees 82 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 Bryan 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.
