San Isidro Weather in September
Average highs run from 29°C on September 1 to 28°C on September 30, and lows from 21°C to 21°C. Normal precipitation for the month is 3 mm over about 3 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
- 21°C
- Precipitation
- 3 mm
- Record high
- 38°CSep 2, 1980
- Record low
- 17°CSep 30, 2007
- Daylight
- 12 h 42 min to 11 h 54 min
- Cloud cover
- 50%
- Humidity
- 78%
- Dew point
- 19°C
- Wind
- 19.8 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 | 29°C | 21°C | 36°C 1980 | 19°C 1998 | 4% |
| Sep 2 | 28°C | 21°C | 38°C 1980 | 20°C 2007 | 4% |
| Sep 3 | 29°C | 21°C | 35°C 1991 | 19°C 1986 | 4% |
| Sep 4 | 28°C | 21°C | 36°C 1986 | 19°C 2008 | 5% |
| Sep 5 | 28°C | 21°C | 36°C 1985 | 18°C 1981 | 5% |
| Sep 6 | 28°C | 21°C | 35°C 2006 | 19°C 1981 | 6% |
| Sep 7 | 28°C | 21°C | 37°C 1986 | 18°C 2007 | 6% |
| Sep 8 | 28°C | 22°C | 37°C 1986 | 19°C 2007 | 6% |
| Sep 9 | 28°C | 21°C | 34°C 2020 | 20°C 1985 | 6% |
| Sep 10 | 28°C | 21°C | 33°C 1981 | 19°C 1990 | 6% |
| Sep 11 | 28°C | 21°C | 33°C 2006 | 19°C 2002 | 6% |
| Sep 12 | 28°C | 21°C | 33°C 2021 | 19°C 1996 | 7% |
| Sep 13 | 28°C | 21°C | 35°C 1987 | 19°C 1996 | 7% |
| Sep 14 | 28°C | 21°C | 33°C 1987 | 18°C 2008 | 7% |
| Sep 15 | 28°C | 21°C | 34°C 1989 | 19°C 2007 | 7% |
| Sep 16 | 28°C | 21°C | 36°C 1989 | 18°C 2007 | 8% |
| Sep 17 | 28°C | 21°C | 37°C 2025 | 19°C 2008 | 8% |
| Sep 18 | 27°C | 21°C | 31°C 1992 | 19°C 1983 | 8% |
| Sep 19 | 28°C | 21°C | 31°C 1987 | 19°C 1994 | 8% |
| Sep 20 | 27°C | 21°C | 34°C 2025 | 18°C 2008 | 9% |
| Sep 21 | 28°C | 21°C | 32°C 2003 | 18°C 2008 | 9% |
| Sep 22 | 28°C | 21°C | 35°C 2015 | 18°C 1984 | 9% |
| Sep 23 | 27°C | 21°C | 33°C 1986 | 19°C 2013 | 9% |
| Sep 24 | 28°C | 21°C | 36°C 2017 | 19°C 2002 | 10% |
| Sep 25 | 28°C | 21°C | 34°C 2020 | 19°C 1981 | 9% |
| Sep 26 | 28°C | 21°C | 32°C 1984 | 18°C 1992 | 10% |
| Sep 27 | 28°C | 21°C | 36°C 1983 | 19°C 2007 | 10% |
| Sep 28 | 28°C | 21°C | 32°C 1990 | 19°C 1994 | 10% |
| Sep 29 | 28°C | 21°C | 32°C 1985 | 17°C 1993 | 10% |
| Sep 30 | 28°C | 21°C | 34°C 1985 | 17°C 2007 | 10% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- September 1
- sunrise 7:45 AM, sunset 8:27 PM
- September 30
- sunrise 7:59 AM, sunset 7:53 PM
Other months
Sources
Records: NOAA GHCN-Daily, station SPE00120476, 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.