Santa Helena Weather in September
Average highs run from 26°C on September 1 to 27°C on September 30, and lows from 16°C to 19°C. Normal precipitation for the month is 123 mm over about 12 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
- 27°C
- Average low
- 17°C
- Precipitation
- 123 mm
- Reanalysis high
- 37°CSep 16, 2019
- Reanalysis low
- 6°CSep 6, 2006
- Daylight
- 11 h 37 min to 12 h 19 min
- Cloud cover
- 56%
- Humidity
- 70%
- Dew point
- 16°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 | 26°C | 16°C | 35°C 1995 | 8°C 2002 | 25% |
| Sep 2 | 26°C | 16°C | 35°C 1995 | 6°C 2002 | 25% |
| Sep 3 | 26°C | 16°C | 34°C 1995 | 9°C 2006 | 24% |
| Sep 4 | 26°C | 17°C | 32°C 1999 | 9°C 2006 | 24% |
| Sep 5 | 26°C | 17°C | 33°C 2012 | 6°C 2006 | 26% |
| Sep 6 | 26°C | 17°C | 34°C 2012 | 6°C 2006 | 28% |
| Sep 7 | 26°C | 17°C | 34°C 1999 | 8°C 2008 | 29% |
| Sep 8 | 26°C | 17°C | 33°C 2007 | 10°C 2008 | 29% |
| Sep 9 | 26°C | 17°C | 35°C 2019 | 10°C 1996 | 29% |
| Sep 10 | 26°C | 17°C | 34°C 2019 | 9°C 1996 | 30% |
| Sep 11 | 27°C | 17°C | 36°C 1995 | 8°C 2003 | 31% |
| Sep 12 | 27°C | 17°C | 34°C 2020 | 10°C 2015 | 32% |
| Sep 13 | 27°C | 17°C | 34°C 2020 | 10°C 2015 | 32% |
| Sep 14 | 27°C | 17°C | 34°C 2017 | 10°C 2015 | 33% |
| Sep 15 | 27°C | 17°C | 35°C 2012 | 11°C 2008 | 33% |
| Sep 16 | 27°C | 17°C | 37°C 2019 | 10°C 2001 | 33% |
| Sep 17 | 27°C | 17°C | 36°C 2012 | 8°C 2001 | 36% |
| Sep 18 | 27°C | 17°C | 36°C 2012 | 9°C 2013 | 37% |
| Sep 19 | 27°C | 17°C | 34°C 2017 | 11°C 2013 | 38% |
| Sep 20 | 27°C | 18°C | 34°C 2017 | 11°C 2005 | 38% |
| Sep 21 | 27°C | 18°C | 36°C 2007 | 11°C 1998 | 38% |
| Sep 22 | 27°C | 18°C | 35°C 2015 | 11°C 2008 | 39% |
| Sep 23 | 27°C | 18°C | 34°C 1994 | 12°C 2008 | 41% |
| Sep 24 | 27°C | 18°C | 35°C 1994 | 10°C 2013 | 43% |
| Sep 25 | 27°C | 18°C | 35°C 1994 | 9°C 2013 | 44% |
| Sep 26 | 27°C | 18°C | 35°C 2020 | 9°C 2012 | 44% |
| Sep 27 | 27°C | 18°C | 35°C 2020 | 11°C 2012 | 44% |
| Sep 28 | 27°C | 18°C | 35°C 2017 | 13°C 1992 | 45% |
| Sep 29 | 27°C | 19°C | 33°C 2020 | 13°C 1992 | 47% |
| Sep 30 | 27°C | 19°C | 36°C 2020 | 13°C 2009 | 47% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 6:49 AM, sunset 6:26 PM
- September 30
- sunrise 6:18 AM, sunset 6:37 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.