Santa Helena Weather in May
Average highs run from 30°C on May 1 to 30°C on May 31, and lows from 23°C to 23°C. Normal precipitation for the month is 273 mm over about 28 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 30°C
- Average low
- 23°C
- Precipitation
- 273 mm
- Reanalysis high
- 34°CMay 26, 2009
- Reanalysis low
- 21°CMay 8, 2013
- Daylight
- 12 h 02 min to 12 h 00 min
- Cloud cover
- 68%
- Humidity
- 91%
- Dew point
- 24°C
- Wind
- 4.0 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 |
|---|---|---|---|---|---|
| May 1 | 30°C | 23°C | 32°C 2010 | 22°C 2007 | 96% |
| May 2 | 30°C | 23°C | 32°C 2010 | 22°C 1999 | 96% |
| May 3 | 30°C | 23°C | 33°C 2005 | 22°C 2015 | 96% |
| May 4 | 30°C | 23°C | 32°C 2019 | 22°C 2018 | 95% |
| May 5 | 30°C | 23°C | 32°C 1998 | 23°C 2015 | 94% |
| May 6 | 30°C | 23°C | 33°C 1998 | 22°C 1997 | 94% |
| May 7 | 30°C | 23°C | 33°C 1998 | 22°C 1999 | 94% |
| May 8 | 30°C | 23°C | 33°C 2003 | 21°C 2013 | 93% |
| May 9 | 30°C | 23°C | 32°C 2003 | 22°C 1999 | 92% |
| May 10 | 30°C | 23°C | 32°C 2004 | 21°C 1997 | 92% |
| May 11 | 30°C | 23°C | 32°C 2009 | 22°C 1991 | 91% |
| May 12 | 30°C | 23°C | 32°C 2010 | 21°C 1991 | 91% |
| May 13 | 30°C | 23°C | 32°C 2016 | 22°C 2015 | 90% |
| May 14 | 30°C | 23°C | 32°C 2010 | 22°C 1992 | 89% |
| May 15 | 30°C | 23°C | 33°C 2010 | 22°C 1997 | 88% |
| May 16 | 30°C | 23°C | 32°C 2010 | 22°C 2001 | 88% |
| May 17 | 30°C | 23°C | 32°C 2004 | 22°C 2001 | 87% |
| May 18 | 30°C | 23°C | 33°C 2010 | 22°C 2012 | 86% |
| May 19 | 30°C | 23°C | 32°C 2011 | 22°C 1992 | 86% |
| May 20 | 30°C | 23°C | 32°C 2001 | 22°C 1995 | 86% |
| May 21 | 30°C | 23°C | 32°C 1992 | 22°C 2012 | 86% |
| May 22 | 30°C | 23°C | 32°C 2016 | 22°C 2012 | 86% |
| May 23 | 30°C | 23°C | 32°C 2016 | 22°C 2011 | 86% |
| May 24 | 30°C | 23°C | 32°C 2016 | 22°C 2019 | 85% |
| May 25 | 30°C | 23°C | 32°C 2017 | 22°C 2020 | 85% |
| May 26 | 30°C | 23°C | 34°C 2009 | 21°C 2004 | 84% |
| May 27 | 30°C | 23°C | 32°C 2017 | 22°C 2001 | 83% |
| May 28 | 30°C | 23°C | 32°C 2020 | 22°C 2007 | 84% |
| May 29 | 30°C | 23°C | 33°C 1995 | 21°C 1996 | 84% |
| May 30 | 30°C | 23°C | 32°C 2015 | 22°C 1993 | 84% |
| May 31 | 30°C | 23°C | 32°C 2013 | 21°C 2009 | 84% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- May 1
- sunrise 5:57 AM, sunset 5:59 PM
- May 31
- sunrise 5:59 AM, sunset 5:59 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.