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Monthly climate in Swellendam, Western Cape, South Africa

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Swellendam features a cold semi-arid climate (BSk).Temperatures typically range between 12 °C (54 °F) and 22 °C (72 °F) through the year, but rarely can drop to 0 °C (32 °F) or can rise to as high as 41 °C (107 °F).The average annual precipitation amounts to about 360 mm (14.2 inches) and receives 68 rainy days on the 1 mm (0.04 inches) threshold annually.Swellendam enjoys an average of 3971 hours of sunshine throughout the year, and daylight varies from 9 hours 54 minutes to 14 hours 21 minutes per day.

Monthly average temperatures in Swellendam, Western Cape, South Africa §

The warmest months in Swellendam are January, February and December, with daily mean temperatures ranging from 20 to 22 °C (69 - 72 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 12 to 13 °C (54 - 56 °F) throughout the day. On average each year, Swellendam experiences 147 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Swellendam, Western Cape, South Africa.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 41°C
(107°F)		 40°C
(104°F)		 36°C
(98°F)		 38°C
(101°F)		 33°C
(91°F)		 29°C
(85°F)		 31°C
(88°F)		 31°C
(88°F)		 37°C
(99°F)		 39°C
(102°F)		 38°C
(101°F)		 40°C
(105°F)
Mean maximum 38°C
(100°F)		 36°C
(98°F)		 36°C
(96°F)		 34°C
(94°F)		 31°C
(88°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(82°F)		 33°C
(92°F)		 34°C
(93°F)		 35°C
(96°F)		 36°C
(96°F)
Average high 29°C
(84°F)		 29°C
(84°F)		 27°C
(81°F)		 25°C
(76°F)		 22°C
(73°F)		 20°C
(68°F)		 19°C
(67°F)		 19°C
(66°F)		 22°C
(71°F)		 24°C
(76°F)		 25°C
(78°F)		 27°C
(81°F)
Daily mean 22°C
(72°F)		 22°C
(72°F)		 20°C
(69°F)		 17°C
(64°F)		 15°C
(60°F)		 13°C
(56°F)		 12°C
(54°F)		 12°C
(54°F)		 15°C
(59°F)		 17°C
(63°F)		 18°C
(66°F)		 20°C
(69°F)
Average low 16°C
(62°F)		 17°C
(62°F)		 15°C
(59°F)		 12°C
(54°F)		 10°C
(50°F)		 7°C
(45°F)		 6°C
(43°F)		 6°C
(43°F)		 9°C
(48°F)		 11°C
(52°F)		 13°C
(55°F)		 15°C
(59°F)
Mean minimum 12°C
(53°F)		 12°C
(54°F)		 10°C
(50°F)		 8°C
(46°F)		 4°C
(40°F)		 3°C
(37°F)		 1°C
(34°F)		 2°C
(35°F)		 3°C
(38°F)		 6°C
(42°F)		 8°C
(47°F)		 10°C
(51°F)
Minimum 11°C
(52°F)		 11°C
(52°F)		 8°C
(47°F)		 6°C
(43°F)		 3°C
(38°F)		 0°C
(32°F)		 0°C
(32°F)		 0°C
(33°F)		 2°C
(35°F)		 4°C
(40°F)		 7°C
(44°F)		 9°C
(49°F)

Compare climate in Swellendam with other places

Compare temperature, precipitation, sunshine, UV index in Swellendam, Western Cape, South Africa with other places around the world.

Monthly average precipitation in Swellendam, Western Cape, South Africa §

Swellendam usually has the most precipitation in March, August and November, with an average of 6 rainy days and 40 mm (1.6 inches) of precipitation per month.The driest months in Swellendam are February, April and June. On average, 20 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Swellendam, Western Cape, South Africa.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 35 (1.4) 22 (0.9) 38 (1.5) 17 (0.7) 29 (1.2) 23 (0.9) 32 (1.3) 36 (1.4) 28 (1.1) 30 (1.2) 45 (1.8) 25 (1.0)
Average precipitation days (≥ 1 mm) 6 6 7 4 4 5 6 6 5 7 6 6

Monthly sunshine hours in Swellendam, Western Cape, South Africa §

The sunniest months in Swellendam are October, November and December, when the sun shines an average of 12 hours 31 minutes a day.Least sunny months in Swellendam: May, June and July receive an average of 9 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Swellendam, Western Cape, South Africa.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 320 349 347 307 292 275 292 308 323 361 380 409
Mean daily daylight hours 14h 6m 13h 17m 12h 14m 11h 11m 10h 19m 9h 54m 10h 7m 10h 53m 11h 53m 12h 56m 13h 52m 14h 21m

Solar UV radiation in Swellendam, Western Cape, South Africa §

Swellendam experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure.May, June and July are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Swellendam UV Index data.

Average daily maximum UV levels by month for Swellendam, Western Cape, South Africa.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 14 13 11 8 5 4 4 6 9 11 12 14