Hermanus Weather in December

NASA POWER reanalysis for the half-degree grid cell around Hermanus, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 20°C on December 1 to 22°C on December 31, and lows from 17°C to 18°C. Normal precipitation for the month is 22 mm over about 3 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: 21°C
Average low: 17°C
Precipitation: 22 mm
Reanalysis high: 27°CDec 26, 2012
Reanalysis low: 13°CDec 3, 1996
Daylight: 14 h 17 min to 14 h 26 min
Cloud cover: 47%
Humidity: 78%
Dew point: 15°C
Wind: 24.1 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	20°C	17°C	24°C 1999	14°C 1996	14%
Dec 2	20°C	17°C	23°C 2013	14°C 1996	13%
Dec 3	20°C	17°C	25°C 2004	13°C 1996	13%
Dec 4	20°C	17°C	26°C 1998	14°C 1996	12%
Dec 5	20°C	17°C	27°C 1998	15°C 1991	12%
Dec 6	21°C	17°C	26°C 2002	15°C 1998	12%
Dec 7	21°C	17°C	26°C 2017	14°C 1998	12%
Dec 8	21°C	17°C	24°C 2010	14°C 2011	13%
Dec 9	21°C	17°C	24°C 2004	15°C 2011	13%
Dec 10	21°C	17°C	25°C 1999	15°C 1993	12%
Dec 11	21°C	17°C	26°C 2004	15°C 1994	11%
Dec 12	21°C	17°C	26°C 1995	16°C 2017	12%
Dec 13	21°C	17°C	27°C 1999	16°C 2017	12%
Dec 14	21°C	17°C	27°C 1999	15°C 2011	12%
Dec 15	21°C	18°C	24°C 1999	16°C 2011	12%
Dec 16	21°C	18°C	26°C 1993	15°C 1997	12%
Dec 17	21°C	18°C	25°C 1999	14°C 1997	14%
Dec 18	21°C	18°C	24°C 2008	15°C 1997	15%
Dec 19	21°C	18°C	24°C 2007	16°C 2005	15%
Dec 20	21°C	18°C	24°C 1997	16°C 2005	15%
Dec 21	21°C	18°C	25°C 2012	16°C 2003	16%
Dec 22	21°C	18°C	26°C 2007	15°C 1998	16%
Dec 23	21°C	18°C	26°C 1993	15°C 2008	16%
Dec 24	21°C	18°C	25°C 2004	15°C 2008	16%
Dec 25	21°C	18°C	25°C 1992	14°C 2003	16%
Dec 26	21°C	18°C	27°C 2012	15°C 2003	17%
Dec 27	21°C	18°C	24°C 1999	16°C 2003	16%
Dec 28	21°C	18°C	26°C 2001	16°C 2009	16%
Dec 29	22°C	18°C	26°C 1999	16°C 2003	16%
Dec 30	22°C	18°C	27°C 2015	16°C 2006	15%
Dec 31	22°C	18°C	24°C 2015	15°C 2006	15%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+2).

December 1: sunrise 5:24 AM, sunset 7:41 PM
December 31: sunrise 5:33 AM, sunset 7:59 PM

Every day of December: sun and moon

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.