Alvin Weather in September
Average highs run from 91°F on September 1 to 85°F on September 30, and lows from 74°F to 66°F. Normal precipitation for the month is 5.37 in over about 11 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
- 89°F
- Average low
- 70°F
- Precipitation
- 5.37 in
- Record high
- 108°FSep 4, 2000
- Record low
- 50°FSep 26, 2000
- Chance of a freeze
- 0%
- Days of 90°F or more
- 13.0
- Daylight
- 12 h 44 min to 11 h 54 min
- Cloud cover
- 47%
- Humidity
- 76%
- Dew point
- 71°F
- Wind
- 8.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 91°F | 74°F | 104°F 2000 | 68°F 2004 | 38% |
| Sep 2 | 91°F | 73°F | 104°F 2000 | 68°F 2009 | 39% |
| Sep 3 | 91°F | 73°F | 105°F 2000 | 70°F 2009 | 39% |
| Sep 4 | 91°F | 73°F | 108°F 2000 | 72°F 1998 | 39% |
| Sep 5 | 90°F | 73°F | 107°F 2000 | 67°F 2011 | 39% |
| Sep 6 | 90°F | 73°F | 103°F 2023 | 60°F 2011 | 39% |
| Sep 7 | 90°F | 73°F | 104°F 2023 | 61°F 2011 | 39% |
| Sep 8 | 90°F | 73°F | 105°F 2023 | 60°F 2011 | 38% |
| Sep 9 | 90°F | 72°F | 99°F 2023 | 61°F 2011 | 38% |
| Sep 10 | 90°F | 72°F | 98°F 2023 | 66°F 2011 | 38% |
| Sep 11 | 90°F | 72°F | 98°F 2023 | 65°F 2012 | 38% |
| Sep 12 | 89°F | 72°F | 100°F 2023 | 62°F 2017 | 38% |
| Sep 13 | 89°F | 71°F | 98°F 2011 | 63°F 2015 | 37% |
| Sep 14 | 89°F | 71°F | 96°F 2011 | 63°F 2015 | 37% |
| Sep 15 | 89°F | 71°F | 97°F 2020 | 64°F 1999 | 37% |
| Sep 16 | 89°F | 71°F | 97°F 2004 | 61°F 1999 | 36% |
| Sep 17 | 88°F | 70°F | 97°F 2004 | 60°F 2000 | 36% |
| Sep 18 | 88°F | 70°F | 99°F 2016 | 57°F 2000 | 36% |
| Sep 19 | 88°F | 70°F | 99°F 2016 | 60°F 1999 | 35% |
| Sep 20 | 88°F | 69°F | 97°F 1999 | 60°F 2012 | 35% |
| Sep 21 | 88°F | 69°F | 100°F 2005 | 60°F 2012 | 34% |
| Sep 22 | 87°F | 69°F | 99°F 2022 | 59°F 1999 | 33% |
| Sep 23 | 87°F | 69°F | 96°F 2022 | 51°F 1999 | 33% |
| Sep 24 | 87°F | 68°F | 96°F 2023 | 53°F 1999 | 32% |
| Sep 25 | 87°F | 68°F | 96°F 2013 | 58°F 2000 | 32% |
| Sep 26 | 86°F | 68°F | 96°F 2005 | 50°F 2000 | 31% |
| Sep 27 | 86°F | 67°F | 98°F 2005 | 53°F 2000 | 30% |
| Sep 28 | 86°F | 67°F | 96°F 2011 | 53°F 2000 | 30% |
| Sep 29 | 86°F | 66°F | 95°F 1998 | 52°F 2000 | 29% |
| Sep 30 | 85°F | 66°F | 94°F 1998 | 55°F 1999 | 29% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:59 AM, sunset 7:43 PM
- September 30
- sunrise 7:14 AM, sunset 7:08 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00410204 (Alvin), public domain. Records: NOAA GHCN-Daily, station USW00012975, 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.