Harris County Weather in September
Average highs run from 93°F on September 1 to 88°F on September 30, and lows from 74°F to 67°F. Normal precipitation for the month is 4.71 in over about 8 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 90°F
- Average low
- 71°F
- Precipitation
- 4.71 in
- Record high
- 109°FSep 4, 2000
- Record low
- 48°FSep 24, 1975
- Chance of a freeze
- 0%
- Days of 90°F or more
- 18.3
- Daylight
- 12 h 45 min to 11 h 54 min
- Cloud cover
- 46%
- Humidity
- 74%
- Dew point
- 69°F
- Wind
- 6.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 93°F | 74°F | 107°F 2000 | 65°F 2004 | 31% | 0% |
| Sep 2 | 93°F | 74°F | 104°F 2000 | 66°F 2009 | 31% | 0% |
| Sep 3 | 93°F | 74°F | 105°F 2000 | 60°F 1987 | 30% | 0% |
| Sep 4 | 93°F | 73°F | 109°F 2000 | 59°F 1974 | 30% | 0% |
| Sep 5 | 92°F | 73°F | 108°F 2000 | 56°F 1974 | 30% | 0% |
| Sep 6 | 92°F | 73°F | 103°F 2023 | 56°F 1974 | 30% | 0% |
| Sep 7 | 92°F | 73°F | 104°F 2023 | 59°F 2011 | 30% | 0% |
| Sep 8 | 92°F | 73°F | 106°F 2023 | 58°F 1988 | 30% | 0% |
| Sep 9 | 92°F | 72°F | 99°F 1987 | 59°F 1988 | 30% | 0% |
| Sep 10 | 92°F | 72°F | 99°F 1993 | 59°F 1988 | 29% | 0% |
| Sep 11 | 91°F | 72°F | 99°F 2011 | 58°F 1976 | 29% | 0% |
| Sep 12 | 91°F | 72°F | 101°F 2011 | 60°F 1969 | 29% | 0% |
| Sep 13 | 91°F | 72°F | 102°F 2011 | 58°F 1969 | 29% | 0% |
| Sep 14 | 91°F | 71°F | 100°F 2011 | 59°F 2015 | 28% | 0% |
| Sep 15 | 91°F | 71°F | 98°F 1980 | 56°F 1989 | 28% | 0% |
| Sep 16 | 90°F | 71°F | 98°F 1995 | 53°F 1979 | 28% | 0% |
| Sep 17 | 90°F | 70°F | 100°F 1995 | 55°F 2000 | 28% | 0% |
| Sep 18 | 90°F | 70°F | 97°F 2016 | 54°F 1981 | 27% | 0% |
| Sep 19 | 90°F | 70°F | 98°F 2024 | 51°F 1981 | 27% | 0% |
| Sep 20 | 90°F | 70°F | 99°F 1999 | 55°F 1981 | 27% | 0% |
| Sep 21 | 89°F | 69°F | 100°F 2005 | 53°F 1983 | 27% | 0% |
| Sep 22 | 89°F | 69°F | 100°F 2005 | 49°F 1983 | 26% | 0% |
| Sep 23 | 89°F | 69°F | 97°F 2023 | 49°F 1999 | 26% | 0% |
| Sep 24 | 89°F | 68°F | 98°F 2023 | 48°F 1975 | 26% | 0% |
| Sep 25 | 89°F | 68°F | 99°F 2005 | 50°F 1989 | 25% | 0% |
| Sep 26 | 88°F | 68°F | 99°F 2005 | 49°F 2000 | 25% | 0% |
| Sep 27 | 88°F | 67°F | 100°F 2005 | 49°F 2000 | 25% | 0% |
| Sep 28 | 88°F | 67°F | 98°F 1998 | 49°F 1975 | 25% | 0% |
| Sep 29 | 88°F | 67°F | 96°F 2011 | 50°F 1975 | 25% | 0% |
| Sep 30 | 88°F | 67°F | 95°F 1998 | 50°F 1984 | 24% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:59 AM, sunset 7:44 PM
- September 30
- sunrise 7:14 AM, sunset 7:08 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00012960 (Houston Intercont AP), public domain. Records: NOAA GHCN-Daily, station USW00012960, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.