Río Grande Weather in September
Average highs run from 27°C on September 1 to 26°C on September 30, and lows from 14°C to 12°C. Normal precipitation for the month is 87 mm over about 15 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 26°C
- Average low
- 13°C
- Precipitation
- 87 mm
- Reanalysis high
- 32°CSep 7, 2015
- Reanalysis low
- 5°CSep 28, 1991
- Daylight
- 12 h 36 min to 11 h 56 min
- Cloud cover
- 54%
- Humidity
- 64%
- Dew point
- 11°C
- Wind
- 13.0 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 | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 27°C | 14°C | 31°C 2010 | 12°C 1991 | 60% |
| Sep 2 | 27°C | 14°C | 31°C 2010 | 12°C 1993 | 60% |
| Sep 3 | 27°C | 14°C | 31°C 2015 | 12°C 1993 | 59% |
| Sep 4 | 27°C | 14°C | 30°C 2015 | 10°C 2006 | 60% |
| Sep 5 | 27°C | 14°C | 31°C 2015 | 11°C 1994 | 60% |
| Sep 6 | 27°C | 14°C | 31°C 2015 | 11°C 1994 | 59% |
| Sep 7 | 27°C | 14°C | 32°C 2015 | 9°C 2011 | 59% |
| Sep 8 | 27°C | 14°C | 30°C 2015 | 8°C 2011 | 58% |
| Sep 9 | 27°C | 13°C | 31°C 2019 | 8°C 2011 | 57% |
| Sep 10 | 27°C | 13°C | 31°C 2000 | 10°C 1991 | 55% |
| Sep 11 | 27°C | 13°C | 31°C 2000 | 10°C 2011 | 55% |
| Sep 12 | 26°C | 13°C | 30°C 2000 | 9°C 2017 | 53% |
| Sep 13 | 27°C | 13°C | 30°C 2011 | 11°C 2017 | 51% |
| Sep 14 | 27°C | 13°C | 31°C 2005 | 12°C 2009 | 51% |
| Sep 15 | 27°C | 13°C | 30°C 2005 | 11°C 1996 | 51% |
| Sep 16 | 27°C | 13°C | 30°C 2001 | 11°C 1996 | 51% |
| Sep 17 | 26°C | 13°C | 31°C 2001 | 10°C 2012 | 50% |
| Sep 18 | 26°C | 13°C | 30°C 2001 | 9°C 2000 | 50% |
| Sep 19 | 26°C | 13°C | 31°C 2015 | 9°C 1994 | 48% |
| Sep 20 | 26°C | 13°C | 30°C 1992 | 8°C 1994 | 48% |
| Sep 21 | 26°C | 13°C | 31°C 2019 | 10°C 1999 | 46% |
| Sep 22 | 26°C | 13°C | 30°C 2019 | 9°C 2012 | 44% |
| Sep 23 | 26°C | 13°C | 29°C 2005 | 8°C 2002 | 42% |
| Sep 24 | 26°C | 13°C | 30°C 1999 | 9°C 2002 | 40% |
| Sep 25 | 26°C | 12°C | 30°C 2005 | 7°C 2002 | 39% |
| Sep 26 | 26°C | 12°C | 31°C 1999 | 8°C 2002 | 38% |
| Sep 27 | 26°C | 12°C | 30°C 1999 | 6°C 1991 | 36% |
| Sep 28 | 26°C | 12°C | 30°C 1997 | 5°C 1991 | 36% |
| Sep 29 | 26°C | 12°C | 29°C 1995 | 6°C 2000 | 34% |
| Sep 30 | 26°C | 12°C | 29°C 1997 | 5°C 1992 | 33% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- September 1
- sunrise 6:34 AM, sunset 7:10 PM
- September 30
- sunrise 6:44 AM, sunset 6:40 PM
Other months
Sources
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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.