Mateo Weather in September
Average highs run from 29°C on September 1 to 27°C on September 30, and lows from 19°C to 19°C. Normal precipitation for the month is 189 mm over about 25 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
- 19°C
- Precipitation
- 189 mm
- Record high
- 34°CSep 4, 1991
- Record low
- 11°CSep 5, 1977
- Daylight
- 12 h 23 min to 12 h 00 min
- Cloud cover
- 74%
- Humidity
- 81%
- Dew point
- 19°C
- Wind
- 7.6 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 | 19°C | 33°C 1977 | 13°C 1980 | 78% |
| Sep 2 | 28°C | 19°C | 32°C 1965 | 14°C 1985 | 78% |
| Sep 3 | 28°C | 19°C | 32°C 2015 | 14°C 1974 | 77% |
| Sep 4 | 28°C | 19°C | 34°C 1991 | 15°C 1993 | 77% |
| Sep 5 | 28°C | 19°C | 33°C 1991 | 11°C 1977 | 77% |
| Sep 6 | 28°C | 19°C | 31°C 2023 | 15°C 1974 | 77% |
| Sep 7 | 28°C | 19°C | 32°C 1965 | 14°C 1964 | 78% |
| Sep 8 | 28°C | 19°C | 32°C 1965 | 13°C 1964 | 78% |
| Sep 9 | 28°C | 19°C | 33°C 2019 | 13°C 1990 | 79% |
| Sep 10 | 28°C | 19°C | 32°C 1997 | 12°C 1974 | 78% |
| Sep 11 | 28°C | 19°C | 32°C 1989 | 15°C 1985 | 79% |
| Sep 12 | 28°C | 19°C | 32°C 1997 | 14°C 2002 | 79% |
| Sep 13 | 28°C | 19°C | 33°C 2024 | 14°C 2001 | 79% |
| Sep 14 | 28°C | 19°C | 32°C 2004 | 15°C 2018 | 79% |
| Sep 15 | 28°C | 19°C | 32°C 2019 | 15°C 1987 | 80% |
| Sep 16 | 28°C | 19°C | 32°C 2024 | 14°C 1991 | 81% |
| Sep 17 | 28°C | 19°C | 33°C 2015 | 14°C 1994 | 82% |
| Sep 18 | 28°C | 19°C | 33°C 2019 | 14°C 2002 | 84% |
| Sep 19 | 28°C | 19°C | 32°C 2023 | 15°C 2012 | 86% |
| Sep 20 | 27°C | 19°C | 31°C 1976 | 14°C 1966 | 87% |
| Sep 21 | 27°C | 19°C | 33°C 2004 | 15°C 1976 | 88% |
| Sep 22 | 27°C | 19°C | 31°C 1985 | 16°C 1992 | 87% |
| Sep 23 | 27°C | 19°C | 32°C 1998 | 15°C 2001 | 88% |
| Sep 24 | 27°C | 19°C | 33°C 2023 | 15°C 2006 | 87% |
| Sep 25 | 27°C | 19°C | 32°C 2023 | 12°C 1996 | 87% |
| Sep 26 | 27°C | 19°C | 31°C 2023 | 12°C 1996 | 86% |
| Sep 27 | 27°C | 19°C | 32°C 1973 | 15°C 2006 | 85% |
| Sep 28 | 27°C | 19°C | 32°C 2017 | 15°C 2002 | 84% |
| Sep 29 | 27°C | 19°C | 31°C 1964 | 15°C 1993 | 83% |
| Sep 30 | 27°C | 19°C | 31°C 2021 | 15°C 1993 | 83% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- September 1
- sunrise 5:38 AM, sunset 6:01 PM
- September 30
- sunrise 5:39 AM, sunset 5:39 PM
Other months
Sources
Records: NOAA GHCN-Daily, station HO000078720, 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 2026-09-29. Sun and moon: computed with the NOAA solar equations and Meeus.