September is one of the warmer months of the year in Sugar Land, with average highs near 31.7°C and lows around 22°C (mean 26.9°C). It is a relatively wet time of year, averaging 124 mm of rainfall and 75% relative humidity across the period.
September is one of the warmer months of the year in Sugar Land. Across 45 years of records, the warmest September in Sugar Land was 2023 — when the month averaged 31.2°C — while the coldest was 1983 at 24.4°C. Typical September days reach 31.7°C with nights near 22°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Sugar Land, averaging 124 mm of rainfall. The wettest September on record was 1998 with 317 mm, while the driest was 1982 at 38 mm.
Relative humidity in Sugar Land during September averages 75%. The most humid September was 2018 at 86%, and the least humid was 2011 at 57%.
September receives about 5.1 kWh/m²/day of solar energy in Sugar Land. The sunniest Septembers were 1999 and 2011 at 5.8 kWh/m²/day, and the cloudiest was 2018 at 3.7.
Average wind speed in Sugar Land during September is 2.1 m/s. The windiest Septembers were 1985, 2002 and 2020 at 2.7 m/s, while the calmest were 2007, 2016 and 2022, among others at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.1°C | 26.7°C | 26.5°C | 27.3°C | 28.4°C | +2.3°C |
| Avg High | 30.8°C | 31.5°C | 31.2°C | 32.0°C | 33.9°C | +3.1°C |
| Avg Low | 21.3°C | 21.8°C | 21.7°C | 22.7°C | 22.8°C | +1.5°C |
| Avg Rain | 117 mm | 134 mm | 130 mm | 139 mm | 86 mm | -32 mm |
September temperatures in Sugar Land have risen by about 2.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 8.7°C (1983) to a record high of 44°C (2000).
Rainfall in September is a relatively wet time of year, averaging 124 mm, with a wettest year of 317 mm.
A good time to visit Sugar Land
September is a good time to visit Sugar Land, with days averaging 31.7°C and nights around 22°C (mean 26.9°C, warmer than Sugar Land's yearly average) and higher rainfall. April and October are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.2°C | 29.0°C | 22.8°C | 37.4°C | 18.0°C | 45 mm | 65% | 1.9 m/s | 5.7 |
| 2024 | 34.2°C | 28.5°C | 22.7°C | 37.8°C | 17.2°C | 52 mm | 71% | 2.3 m/s | 5.1 |
| 2023 🔥 | 37.3°C | 31.2°C | 25.1°C | 42.7°C | 22.3°C | 60 mm | 63% | 2 m/s | 5.4 |
| 2022 | 33.5°C | 27.8°C | 22.0°C | 37.3°C | 14.0°C | 44 mm | 70% | 1.7 m/s | 5.7 |
| 2021 | 31.8°C | 26.7°C | 21.7°C | 35.0°C | 14.1°C | 148 mm | 76% | 2 m/s | 5.1 |
| 2020 | 31.6°C | 26.9°C | 22.2°C | 36.0°C | 11.7°C | 166 mm | 75% | 2.7 m/s | 4.6 |
| 2019 | 34.1°C | 29.2°C | 24.3°C | 39.1°C | 22.1°C | 241 mm | 74% | 2.5 m/s | 5.3 |
| 2018 | 30.1°C | 26.8°C | 23.5°C | 34.7°C | 19.6°C | 266 mm | 86% | 1.8 m/s | 3.7 |
| 2017 | 30.3°C | 25.6°C | 20.9°C | 32.4°C | 15.0°C | 48 mm | 80% | 1.9 m/s | 5.6 |
| 2016 | 31.3°C | 27.3°C | 23.3°C | 33.9°C | 15.0°C | 89 mm | 82% | 1.7 m/s | 5.2 |
| 2015 | 31.1°C | 26.6°C | 22.0°C | 33.9°C | 15.3°C | 145 mm | 80% | 1.8 m/s | 5.2 |
| 2014 | 30.6°C | 26.7°C | 22.9°C | 35.5°C | 17.2°C | 157 mm | 82% | 2 m/s | 4.7 |
| 2013 | 32.7°C | 28.0°C | 23.4°C | 36.3°C | 17.2°C | 136 mm | 75% | 2.3 m/s | 5 |
| 2012 | 32.4°C | 27.1°C | 21.7°C | 37.3°C | 16.4°C | 100 mm | 73% | 2.1 m/s | 5.3 |
| 2011 | 35.7°C | 29.0°C | 22.3°C | 40.0°C | 16.4°C | 53 mm | 57% | 2.5 m/s | 5.8 |
| 2010 | 31.4°C | 27.1°C | 22.8°C | 33.7°C | 12.8°C | 154 mm | 78% | 2.1 m/s | 4.9 |
| 2009 | 31.1°C | 26.5°C | 21.9°C | 35.4°C | 17.6°C | 117 mm | 78% | 1.9 m/s | 4.1 |
| 2008 | 30.7°C | 25.5°C | 20.3°C | 36.3°C | 15.1°C | 146 mm | 74% | 2.6 m/s | 5.5 |
| 2007 | 29.9°C | 26.1°C | 22.3°C | 31.6°C | 18.1°C | 125 mm | 84% | 1.7 m/s | 5 |
| 2006 | 30.9°C | 26.1°C | 21.3°C | 33.4°C | 14.0°C | 108 mm | 76% | 2.1 m/s | 5.2 |
| 2005 | 34.6°C | 29.3°C | 24.1°C | 39.0°C | 20.8°C | 77 mm | 72% | 2.4 m/s | 5.2 |
| 2004 | 33.4°C | 28.1°C | 22.7°C | 37.5°C | 19.7°C | 40 mm | 69% | 2 m/s | 5.3 |
| 2003 | 28.7°C | 24.7°C | 20.7°C | 31.3°C | 13.5°C | 211 mm | 82% | 1.9 m/s | 4.9 |
| 2002 | 29.6°C | 25.6°C | 21.6°C | 32.7°C | 16.6°C | 235 mm | 82% | 2.7 m/s | 4.7 |
| 2001 | 29.2°C | 25.1°C | 21.0°C | 33.0°C | 11.7°C | 139 mm | 83% | 2 m/s | 5.4 |
| 2000 | 33.5°C | 27.5°C | 21.5°C | 44.0°C | 10.6°C | 97 mm | 65% | 2.6 m/s | 5.7 |
| 1999 | 33.8°C | 27.6°C | 21.3°C | 38.9°C | 13.7°C | 65 mm | 61% | 2.3 m/s | 5.8 |
| 1998 🌧️ | 31.5°C | 27.7°C | 23.9°C | 36.8°C | 22.1°C | 317 mm | 82% | 2.5 m/s | 4.9 |
| 1997 | 32.8°C | 27.7°C | 22.5°C | 36.0°C | 16.1°C | 196 mm | 73% | 2.1 m/s | 5.3 |
| 1996 | 29.7°C | 25.6°C | 21.5°C | 32.5°C | 10.6°C | 188 mm | 81% | 1.8 m/s | 5.1 |
| 1995 | 33.0°C | 27.6°C | 22.2°C | 37.4°C | 11.8°C | 75 mm | 71% | 1.8 m/s | 5.5 |
| 1994 | 30.4°C | 25.4°C | 20.3°C | 34.0°C | 11.0°C | 95 mm | 74% | 1.9 m/s | 5.5 |
| 1993 | 33.8°C | 27.6°C | 21.4°C | 36.9°C | 12.7°C | 57 mm | 68% | 2.3 m/s | 5.4 |
| 1992 | 30.8°C | 26.4°C | 22.1°C | 33.5°C | 12.1°C | 72 mm | 77% | 2.3 m/s | 4.9 |
| 1991 | 28.5°C | 24.5°C | 20.6°C | 31.1°C | 11.0°C | 156 mm | 83% | 2 m/s | 4.8 |
| 1990 | 31.0°C | 26.6°C | 22.1°C | 36.0°C | 11.9°C | 123 mm | 77% | 1.7 m/s | 5 |
| 1989 | 30.8°C | 25.1°C | 19.4°C | 35.5°C | 10.5°C | 45 mm | 71% | 2.1 m/s | 5.5 |
| 1988 | 32.3°C | 27.0°C | 21.7°C | 35.1°C | 15.8°C | 126 mm | 73% | 2.6 m/s | 5 |
| 1987 | 31.2°C | 26.2°C | 21.1°C | 34.8°C | 14.4°C | 118 mm | 73% | 2 m/s | 5.3 |
| 1986 | 30.6°C | 27.2°C | 23.7°C | 32.3°C | 21.9°C | 134 mm | 83% | 2.3 m/s | 4.6 |
| 1985 | 31.3°C | 26.7°C | 22.1°C | 38.5°C | 11.0°C | 156 mm | 74% | 2.7 m/s | 5.2 |
| 1984 | 29.7°C | 25.2°C | 20.6°C | 33.9°C | 10.5°C | 125 mm | 76% | 2.6 m/s | 4.6 |
| 1983 ❄️ | 28.4°C | 24.4°C | 20.4°C | 32.2°C | 8.7°C | 248 mm | 84% | 2.2 m/s | — |
| 1982 | 33.6°C | 27.8°C | 22.0°C | 37.1°C | 13.6°C | 38 mm | 66% | 2.4 m/s | — |
| 1981 | 29.5°C | 24.9°C | 20.4°C | 32.0°C | 10.7°C | 66 mm | 78% | 1.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 31.7°C with lows near 22°C (mean 26.9°C), based on 45 years of NASA POWER data.
September averages 124 mm of rainfall in Sugar Land, a relatively wet time of year. The wettest on record was 317 mm in 1998.
The hottest September reached 44°C in 2000. The coldest dipped to 8.7°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.8°C. Daytime highs moved from 30.5°C to 34.4°C and overnight lows from 21.1°C to 22.9°C over the same span.
September is one of the warmer months of the year in Sugar Land and a relatively wet time of year, so plan for around 31.7°C daytime highs and 22°C at night.
Not quite — September is the 9th coolest month in Sugar Land, averaging 26.9°C.
For September in Sugar Land, pack light, breathable clothing and sun protection, with typical highs of 31.7°C and lows of 22°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 75% — quite humid.
Average wind speed in September is 2.1 m/s. The windiest September on record averaged 2.7 m/s (1985).
The wettest September on record was 1998 with 317 mm. On average, September sees 124 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 Sugar Land 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.
