Alamo Weather in September
Average highs run from 78°F on September 1 to 70°F on September 30, and lows from 50°F to 42°F. Normal precipitation for the month is 1.50 in over about 7 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
- 75°F
- Average low
- 46°F
- Precipitation
- 1.50 in
- Record high
- 100°FSep 1, 2005
- Record low
- 31°FSep 19, 2006
- Chance of a freeze
- 18%
- Daylight
- 12 h 53 min to 11 h 51 min
- Cloud cover
- 39%
- Humidity
- 47%
- Dew point
- 41°F
- Wind
- 8.1 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 | 78°F | 50°F | 100°F 2005 | 45°F 1961 | 32% | 0% |
| Sep 2 | 78°F | 50°F | 100°F 2013 | 46°F 1959 | 32% | 0% |
| Sep 3 | 78°F | 50°F | 98°F 1980 | 44°F 1961 | 31% | 0% |
| Sep 4 | 78°F | 50°F | 98°F 1980 | 35°F 1961 | 31% | 0% |
| Sep 5 | 78°F | 49°F | 99°F 2012 | 36°F 1961 | 30% | 0% |
| Sep 6 | 77°F | 49°F | 98°F 1995 | 43°F 2004 | 30% | 0% |
| Sep 7 | 77°F | 49°F | 98°F 1995 | 40°F 1961 | 29% | 0% |
| Sep 8 | 77°F | 49°F | 98°F 2000 | 43°F 1970 | 29% | 0% |
| Sep 9 | 77°F | 48°F | 98°F 2023 | 43°F 1962 | 28% | 0% |
| Sep 10 | 77°F | 48°F | 96°F 2026 | 37°F 1962 | 28% | 0% |
| Sep 11 | 76°F | 48°F | 97°F 2026 | 39°F 1986 | 27% | 0% |
| Sep 12 | 76°F | 48°F | 98°F 2026 | 37°F 1957 | 26% | 0% |
| Sep 13 | 76°F | 47°F | 95°F 2004 | 42°F 1968 | 26% | 0% |
| Sep 14 | 76°F | 47°F | 97°F 2015 | 39°F 1967 | 25% | 0% |
| Sep 15 | 75°F | 47°F | 96°F 2000 | 40°F 1958 | 24% | 0% |
| Sep 16 | 75°F | 46°F | 94°F 2000 | 35°F 1971 | 24% | 0% |
| Sep 17 | 75°F | 46°F | 95°F 2000 | 35°F 1968 | 23% | 0% |
| Sep 18 | 74°F | 46°F | 95°F 2000 | 33°F 2006 | 23% | 0% |
| Sep 19 | 74°F | 46°F | 96°F 2018 | 31°F 2006 | 22% | 0% |
| Sep 20 | 74°F | 45°F | 94°F 2005 | 33°F 1971 | 21% | 0% |
| Sep 21 | 73°F | 45°F | 96°F 2005 | 34°F 1965 | 21% | 0% |
| Sep 22 | 73°F | 45°F | 92°F 2001 | 34°F 1965 | 20% | |
| Sep 23 | 73°F | 44°F | 92°F 2012 | 34°F 1970 | 20% | |
| Sep 24 | 72°F | 44°F | 93°F 2007 | 34°F 1968 | 20% | |
| Sep 25 | 72°F | 44°F | 94°F 2005 | 33°F 1959 | 19% | |
| Sep 26 | 72°F | 43°F | 94°F 2005 | 33°F 1970 | 19% | |
| Sep 27 | 71°F | 43°F | 95°F 2005 | 33°F 1970 | 18% | |
| Sep 28 | 71°F | 43°F | 95°F 2015 | 32°F 1973 | 18% | |
| Sep 29 | 71°F | 42°F | 95°F 1998 | 32°F 1996 | 18% | |
| Sep 30 | 70°F | 42°F | 94°F 2015 | 34°F 1965 | 17% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:43 AM, sunset 7:36 PM
- September 30
- sunrise 7:04 AM, sunset 6:55 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00296812 (Pietown 19NE), public domain. Records: NOAA GHCN-Daily, station USC00295150, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.