Hermanus Weather in May
Average highs run from 19°C on May 1 to 17°C on May 31, and lows from 15°C to 14°C. Normal precipitation for the month is 62 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
- 18°C
- Average low
- 15°C
- Precipitation
- 62 mm
- Reanalysis high
- 24°CMay 21, 2003
- Reanalysis low
- 11°CMay 20, 2007
- Daylight
- 10 h 42 min to 10 h 01 min
- Cloud cover
- 48%
- Humidity
- 81%
- Dew point
- 13°C
- Wind
- 20.9 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 | 19°C | 15°C | 23°C 2011 | 12°C 2016 | 28% |
| May 2 | 19°C | 15°C | 20°C 1994 | 12°C 2000 | 29% |
| May 3 | 19°C | 15°C | 21°C 1995 | 13°C 2000 | 29% |
| May 4 | 19°C | 15°C | 23°C 2017 | 13°C 2001 | 28% |
| May 5 | 19°C | 15°C | 23°C 2007 | 12°C 2006 | 28% |
| May 6 | 19°C | 15°C | 23°C 2013 | 13°C 2001 | 29% |
| May 7 | 19°C | 15°C | 21°C 1991 | 13°C 2002 | 29% |
| May 8 | 19°C | 15°C | 22°C 1996 | 13°C 2006 | 29% |
| May 9 | 18°C | 15°C | 22°C 2020 | 14°C 1995 | 28% |
| May 10 | 19°C | 15°C | 21°C 2009 | 14°C 2017 | 27% |
| May 11 | 19°C | 15°C | 21°C 1997 | 14°C 1995 | 27% |
| May 12 | 19°C | 15°C | 23°C 1997 | 14°C 2017 | 27% |
| May 13 | 19°C | 15°C | 22°C 1992 | 13°C 2017 | 28% |
| May 14 | 19°C | 15°C | 23°C 1991 | 13°C 2006 | 29% |
| May 15 | 18°C | 15°C | 24°C 2017 | 13°C 2006 | 29% |
| May 16 | 18°C | 15°C | 22°C 1999 | 13°C 1992 | 30% |
| May 17 | 18°C | 15°C | 22°C 2016 | 14°C 2015 | 30% |
| May 18 | 18°C | 15°C | 22°C 2008 | 13°C 2012 | 31% |
| May 19 | 18°C | 15°C | 23°C 2008 | 13°C 2012 | 32% |
| May 20 | 18°C | 15°C | 23°C 2020 | 11°C 2007 | 33% |
| May 21 | 18°C | 15°C | 24°C 2003 | 12°C 2007 | 34% |
| May 22 | 18°C | 15°C | 22°C 2003 | 12°C 1994 | 35% |
| May 23 | 18°C | 15°C | 20°C 2003 | 13°C 2006 | 37% |
| May 24 | 18°C | 15°C | 20°C 2008 | 12°C 2006 | 39% |
| May 25 | 17°C | 15°C | 21°C 2019 | 13°C 1994 | 40% |
| May 26 | 17°C | 14°C | 23°C 2004 | 12°C 1996 | 41% |
| May 27 | 17°C | 14°C | 20°C 2009 | 11°C 1992 | 42% |
| May 28 | 17°C | 14°C | 22°C 1995 | 12°C 1991 | 42% |
| May 29 | 17°C | 14°C | 21°C 2019 | 12°C 2009 | 42% |
| May 30 | 17°C | 14°C | 21°C 2017 | 12°C 2002 | 42% |
| May 31 | 17°C | 14°C | 19°C 2020 | 12°C 1996 | 43% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- May 1
- sunrise 7:19 AM, sunset 6:01 PM
- May 31
- sunrise 7:40 AM, sunset 5:41 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.