Swellendam Weather in December
Average highs run from 28°C on December 1 to 30°C on December 31, and lows from 13°C to 16°C. Normal precipitation for the month is 37 mm over about 6 wet days.
December day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
December at a glance
- Average high
- 29°C
- Average low
- 15°C
- Precipitation
- 37 mm
- Reanalysis high
- 43°CDec 7, 2002
- Reanalysis low
- 6°CDec 3, 1996
- Daylight
- 14 h 15 min to 14 h 23 min
- Cloud cover
- 37%
- Humidity
- 60%
- Dew point
- 11°C
- Wind
- 17.3 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 |
|---|---|---|---|---|---|
| Dec 1 | 28°C | 13°C | 38°C 1999 | 10°C 2008 | 19% |
| Dec 2 | 28°C | 14°C | 35°C 2016 | 8°C 1996 | 19% |
| Dec 3 | 28°C | 14°C | 38°C 2004 | 6°C 1996 | 19% |
| Dec 4 | 28°C | 14°C | 39°C 2004 | 8°C 2007 | 18% |
| Dec 5 | 29°C | 14°C | 37°C 2019 | 9°C 1991 | 18% |
| Dec 6 | 29°C | 14°C | 39°C 2002 | 12°C 2010 | 19% |
| Dec 7 | 29°C | 14°C | 43°C 2002 | 10°C 2010 | 19% |
| Dec 8 | 29°C | 14°C | 42°C 2017 | 10°C 2011 | 18% |
| Dec 9 | 29°C | 14°C | 34°C 1999 | 9°C 2011 | 19% |
| Dec 10 | 29°C | 14°C | 34°C 1996 | 11°C 2005 | 17% |
| Dec 11 | 29°C | 15°C | 37°C 2004 | 9°C 1994 | 16% |
| Dec 12 | 29°C | 15°C | 39°C 1997 | 11°C 2000 | 15% |
| Dec 13 | 29°C | 15°C | 40°C 1999 | 10°C 2005 | 15% |
| Dec 14 | 29°C | 15°C | 40°C 1999 | 10°C 2011 | 16% |
| Dec 15 | 29°C | 15°C | 38°C 1997 | 9°C 2011 | 16% |
| Dec 16 | 29°C | 15°C | 37°C 1993 | 11°C 2011 | 18% |
| Dec 17 | 29°C | 15°C | 39°C 2019 | 10°C 1997 | 18% |
| Dec 18 | 30°C | 15°C | 39°C 1991 | 10°C 1997 | 19% |
| Dec 19 | 30°C | 15°C | 34°C 1994 | 11°C 2017 | 20% |
| Dec 20 | 29°C | 15°C | 42°C 1997 | 11°C 2017 | 21% |
| Dec 21 | 29°C | 15°C | 41°C 2012 | 10°C 2005 | 21% |
| Dec 22 | 30°C | 15°C | 39°C 2012 | 11°C 2019 | 21% |
| Dec 23 | 30°C | 15°C | 40°C 1993 | 10°C 1998 | 21% |
| Dec 24 | 30°C | 15°C | 38°C 1993 | 11°C 2008 | 21% |
| Dec 25 | 30°C | 15°C | 35°C 2013 | 10°C 2003 | 22% |
| Dec 26 | 30°C | 15°C | 36°C 1992 | 10°C 2003 | 22% |
| Dec 27 | 30°C | 15°C | 35°C 2013 | 11°C 2003 | 22% |
| Dec 28 | 30°C | 15°C | 40°C 2001 | 11°C 2009 | 22% |
| Dec 29 | 30°C | 15°C | 38°C 1999 | 13°C 2003 | 21% |
| Dec 30 | 30°C | 16°C | 43°C 2015 | 11°C 2006 | 21% |
| Dec 31 | 30°C | 16°C | 39°C 2018 | 12°C 2006 | 21% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- December 1
- sunrise 5:20 AM, sunset 7:35 PM
- December 31
- sunrise 5:30 AM, sunset 7:53 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.