Santa Helena Weather in May
Average highs run from 26°C on May 1 to 22°C on May 31, and lows from 18°C to 15°C. Normal precipitation for the month is 167 mm over about 9 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
- 24°C
- Average low
- 16°C
- Precipitation
- 167 mm
- Reanalysis high
- 32°CMay 1, 2018
- Reanalysis low
- 5°CMay 30, 2007
- Daylight
- 11 h 10 min to 10 h 42 min
- Cloud cover
- 55%
- Humidity
- 77%
- Dew point
- 16°C
- Wind
- 11.2 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 |
|---|---|---|---|---|---|
| May 1 | 26°C | 18°C | 32°C 2018 | 9°C 2016 | 32% |
| May 2 | 26°C | 18°C | 32°C 2018 | 10°C 2016 | 32% |
| May 3 | 26°C | 18°C | 31°C 2013 | 11°C 2011 | 30% |
| May 4 | 26°C | 18°C | 31°C 2018 | 12°C 2006 | 30% |
| May 5 | 25°C | 18°C | 31°C 1994 | 10°C 2001 | 30% |
| May 6 | 25°C | 17°C | 31°C 1994 | 11°C 1993 | 30% |
| May 7 | 25°C | 17°C | 31°C 1994 | 10°C 2020 | 31% |
| May 8 | 25°C | 17°C | 31°C 1994 | 10°C 2003 | 31% |
| May 9 | 25°C | 17°C | 30°C 1997 | 9°C 2007 | 32% |
| May 10 | 25°C | 17°C | 29°C 2018 | 9°C 2007 | 32% |
| May 11 | 24°C | 17°C | 30°C 2009 | 13°C 2006 | 32% |
| May 12 | 24°C | 17°C | 30°C 2009 | 12°C 2010 | 30% |
| May 13 | 24°C | 17°C | 30°C 2005 | 11°C 2006 | 30% |
| May 14 | 24°C | 17°C | 30°C 2005 | 10°C 2001 | 30% |
| May 15 | 24°C | 16°C | 29°C 2005 | 11°C 2009 | 32% |
| May 16 | 24°C | 16°C | 28°C 1995 | 10°C 2009 | 33% |
| May 17 | 24°C | 16°C | 27°C 2002 | 10°C 2009 | 34% |
| May 18 | 23°C | 16°C | 28°C 2003 | 10°C 2001 | 34% |
| May 19 | 23°C | 16°C | 28°C 2008 | 9°C 2001 | 35% |
| May 20 | 23°C | 16°C | 28°C 2008 | 9°C 1999 | 36% |
| May 21 | 23°C | 16°C | 29°C 2020 | 10°C 1999 | 35% |
| May 22 | 23°C | 16°C | 28°C 2008 | 10°C 2005 | 35% |
| May 23 | 23°C | 16°C | 27°C 2015 | 9°C 2006 | 36% |
| May 24 | 23°C | 16°C | 27°C 2015 | 9°C 2007 | 36% |
| May 25 | 23°C | 15°C | 28°C 2015 | 9°C 2007 | 37% |
| May 26 | 22°C | 15°C | 27°C 2017 | 9°C 2007 | 37% |
| May 27 | 22°C | 15°C | 28°C 1991 | 10°C 2020 | 38% |
| May 28 | 22°C | 15°C | 29°C 2006 | 10°C 2000 | 38% |
| May 29 | 22°C | 15°C | 28°C 2006 | 7°C 2007 | 38% |
| May 30 | 22°C | 15°C | 28°C 2006 | 5°C 2007 | 37% |
| May 31 | 22°C | 15°C | 28°C 2006 | 7°C 2007 | 35% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- May 1
- sunrise 6:59 AM, sunset 6:09 PM
- May 31
- sunrise 7:14 AM, sunset 5:56 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.