Formosa Weather in September
Average highs run from 31°C on September 1 to 32°C on September 30, and lows from 16°C to 19°C. Normal precipitation for the month is 33 mm over about 6 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
- 32°C
- Average low
- 17°C
- Precipitation
- 33 mm
- Reanalysis high
- 38°CSep 25, 2015
- Reanalysis low
- 10°CSep 1, 1997
- Daylight
- 11 h 49 min to 12 h 13 min
- Cloud cover
- 41%
- Humidity
- 50%
- Dew point
- 11°C
- Wind
- 12.2 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 | 31°C | 16°C | 34°C 2015 | 10°C 1997 | 10% |
| Sep 2 | 31°C | 16°C | 35°C 2015 | 12°C 1991 | 10% |
| Sep 3 | 31°C | 16°C | 35°C 2019 | 11°C 2004 | 10% |
| Sep 4 | 31°C | 16°C | 36°C 2015 | 11°C 2004 | 10% |
| Sep 5 | 31°C | 16°C | 36°C 2015 | 12°C 2011 | 11% |
| Sep 6 | 31°C | 16°C | 36°C 2015 | 13°C 1991 | 11% |
| Sep 7 | 31°C | 16°C | 35°C 1998 | 11°C 1991 | 12% |
| Sep 8 | 31°C | 16°C | 35°C 1999 | 11°C 1991 | 13% |
| Sep 9 | 32°C | 16°C | 36°C 1999 | 11°C 2004 | 14% |
| Sep 10 | 32°C | 16°C | 35°C 2001 | 12°C 2004 | 14% |
| Sep 11 | 32°C | 17°C | 37°C 2015 | 13°C 2006 | 15% |
| Sep 12 | 32°C | 17°C | 36°C 2001 | 13°C 2010 | 17% |
| Sep 13 | 32°C | 17°C | 36°C 2019 | 12°C 2010 | 18% |
| Sep 14 | 32°C | 17°C | 36°C 2012 | 13°C 2006 | 19% |
| Sep 15 | 32°C | 17°C | 36°C 2016 | 13°C 2006 | 20% |
| Sep 16 | 32°C | 17°C | 37°C 2016 | 14°C 2006 | 22% |
| Sep 17 | 32°C | 17°C | 36°C 1998 | 13°C 2001 | 24% |
| Sep 18 | 32°C | 18°C | 36°C 2016 | 14°C 2011 | 25% |
| Sep 19 | 32°C | 18°C | 37°C 2020 | 14°C 2011 | 27% |
| Sep 20 | 32°C | 18°C | 37°C 2020 | 13°C 2011 | 27% |
| Sep 21 | 32°C | 18°C | 38°C 2019 | 13°C 2000 | 28% |
| Sep 22 | 32°C | 18°C | 37°C 2019 | 13°C 2000 | 29% |
| Sep 23 | 32°C | 18°C | 36°C 2015 | 14°C 1994 | 30% |
| Sep 24 | 32°C | 18°C | 38°C 2015 | 13°C 2008 | 31% |
| Sep 25 | 32°C | 18°C | 38°C 2015 | 14°C 1999 | 33% |
| Sep 26 | 32°C | 18°C | 38°C 2015 | 13°C 2004 | 34% |
| Sep 27 | 32°C | 18°C | 37°C 2015 | 14°C 2004 | 36% |
| Sep 28 | 32°C | 19°C | 37°C 2020 | 15°C 2007 | 36% |
| Sep 29 | 32°C | 19°C | 38°C 2020 | 15°C 2004 | 37% |
| Sep 30 | 32°C | 19°C | 37°C 2018 | 16°C 2004 | 37% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 6:15 AM, sunset 6:04 PM
- September 30
- sunrise 5:53 AM, sunset 6:06 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.