San Antonio de Los Altos Weather in September
Average highs run from 28°C on September 1 to 28°C on September 30, and lows from 22°C to 22°C. Normal precipitation for the month is 108 mm over about 21 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 28°C
- Average low
- 22°C
- Precipitation
- 108 mm
- Record high
- 36°CSep 4, 2004
- Record low
- 17°CSep 1, 1994
- Daylight
- 12 h 19 min to 12 h 02 min
- Cloud cover
- 57%
- Humidity
- 83%
- Dew point
- 21°C
- Wind
- 6.8 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 28°C | 22°C | 34°C 2007 | 17°C 1994 | 69% |
| Sep 2 | 28°C | 22°C | 34°C 2002 | 20°C 2005 | 69% |
| Sep 3 | 28°C | 22°C | 35°C 2012 | 19°C 2003 | 70% |
| Sep 4 | 28°C | 22°C | 36°C 2004 | 22°C 1985 | 70% |
| Sep 5 | 28°C | 22°C | 35°C 2003 | 21°C 2004 | 70% |
| Sep 6 | 28°C | 22°C | 36°C 2003 | 19°C 1995 | 70% |
| Sep 7 | 28°C | 22°C | 35°C 2005 | 22°C 1995 | 70% |
| Sep 8 | 28°C | 22°C | 36°C 2005 | 23°C 1975 | 71% |
| Sep 9 | 28°C | 22°C | 36°C 2012 | 22°C 1992 | 70% |
| Sep 10 | 28°C | 22°C | 36°C 2012 | 21°C 1995 | 71% |
| Sep 11 | 28°C | 22°C | 36°C 2005 | 20°C 1995 | 71% |
| Sep 12 | 28°C | 22°C | 34°C 2001 | 21°C 1995 | 71% |
| Sep 13 | 28°C | 22°C | 35°C 2002 | 21°C 1995 | 71% |
| Sep 14 | 28°C | 22°C | 34°C 2008 | 21°C 1999 | 71% |
| Sep 15 | 28°C | 22°C | 34°C 2009 | 20°C 1995 | 71% |
| Sep 16 | 28°C | 22°C | 35°C 2013 | 20°C 1995 | 70% |
| Sep 17 | 28°C | 22°C | 35°C 1999 | 21°C 1992 | 69% |
| Sep 18 | 28°C | 22°C | 35°C 2004 | 22°C 1977 | 68% |
| Sep 19 | 28°C | 22°C | 35°C 1987 | 24°C 1973 | 68% |
| Sep 20 | 28°C | 22°C | 36°C 1992 | 23°C 1994 | 67% |
| Sep 21 | 28°C | 22°C | 34°C 2009 | 21°C 1979 | 66% |
| Sep 22 | 28°C | 22°C | 35°C 2012 | 23°C 1985 | 66% |
| Sep 23 | 28°C | 22°C | 36°C 2013 | 20°C 1999 | 64% |
| Sep 24 | 28°C | 22°C | 35°C 1977 | 20°C 2014 | 64% |
| Sep 25 | 28°C | 22°C | 35°C 1987 | 23°C 1974 | 64% |
| Sep 26 | 28°C | 22°C | 35°C 1987 | 23°C 2011 | 65% |
| Sep 27 | 28°C | 22°C | 34°C 1997 | 22°C 1995 | 66% |
| Sep 28 | 28°C | 22°C | 35°C 1991 | 19°C 1995 | 65% |
| Sep 29 | 28°C | 22°C | 35°C 1990 | 23°C 1984 | 66% |
| Sep 30 | 28°C | 22°C | 36°C 2002 | 21°C 1999 | 67% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-4).
- September 1
- sunrise 6:18 AM, sunset 6:37 PM
- September 30
- sunrise 6:17 AM, sunset 6:19 PM
Other months
Sources
Records: NOAA GHCN-Daily, station VEM00080415, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine, and temperature and precipitation: 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.