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Monthly climate in Arniston, Western Cape, South Africa

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Arniston features a cold semi-arid climate (BSk).Temperatures typically range between 14 °C (57 °F) and 21 °C (70 °F) through the year, but rarely can drop to 8 °C (47 °F) or can rise to as high as 30 °C (85 °F).The average annual precipitation amounts to about 435 mm (17.1 inches) and receives 79 rainy days on the 1 mm (0.04 inches) threshold annually.Arniston enjoys an average of 3969 hours of sunshine throughout the year, and daylight varies from 9 hours 51 minutes to 14 hours 25 minutes per day.

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

The warmest months in Arniston are January, February and March, with daily mean temperatures ranging from 20 to 21 °C (69 - 70 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 14 to 15 °C (57 - 60 °F) throughout the day. On average each year, Arniston experiences 3 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 Arniston, 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 26°C
(80°F)		 26°C
(80°F)		 27°C
(80°F)		 28°C
(83°F)		 28°C
(82°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(77°F)		 30°C
(85°F)		 28°C
(82°F)		 25°C
(77°F)		 25°C
(78°F)
Mean maximum 25°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)		 24°C
(76°F)		 24°C
(75°F)		 22°C
(72°F)		 22°C
(71°F)		 21°C
(69°F)		 24°C
(76°F)		 23°C
(73°F)		 23°C
(74°F)		 24°C
(75°F)
Average high 22°C
(72°F)		 23°C
(73°F)		 22°C
(72°F)		 20°C
(68°F)		 19°C
(66°F)		 17°C
(64°F)		 17°C
(62°F)		 16°C
(61°F)		 17°C
(63°F)		 18°C
(65°F)		 19°C
(67°F)		 21°C
(69°F)
Daily mean 21°C
(70°F)		 21°C
(70°F)		 20°C
(69°F)		 18°C
(65°F)		 17°C
(62°F)		 15°C
(60°F)		 14°C
(58°F)		 14°C
(57°F)		 15°C
(60°F)		 17°C
(62°F)		 18°C
(64°F)		 19°C
(67°F)
Average low 19°C
(67°F)		 20°C
(68°F)		 19°C
(66°F)		 17°C
(62°F)		 15°C
(59°F)		 13°C
(56°F)		 12°C
(54°F)		 12°C
(54°F)		 13°C
(57°F)		 15°C
(59°F)		 16°C
(62°F)		 18°C
(64°F)
Mean minimum 17°C
(63°F)		 18°C
(64°F)		 16°C
(61°F)		 14°C
(58°F)		 12°C
(54°F)		 11°C
(52°F)		 10°C
(50°F)		 9°C
(49°F)		 11°C
(52°F)		 12°C
(54°F)		 13°C
(56°F)		 16°C
(60°F)
Minimum 16°C
(61°F)		 16°C
(62°F)		 15°C
(60°F)		 14°C
(57°F)		 11°C
(53°F)		 9°C
(49°F)		 9°C
(49°F)		 8°C
(47°F)		 10°C
(51°F)		 11°C
(53°F)		 12°C
(54°F)		 15°C
(59°F)

Compare climate in Arniston with other places

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

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

Arniston usually has the most precipitation in May, July and August, with an average of 7 rainy days and 49 mm (1.9 inches) of precipitation per month.The driest months in Arniston are January, February and April. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Arniston, 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) 26 (1.0) 18 (0.7) 43 (1.7) 23 (0.9) 50 (2.0) 45 (1.8) 45 (1.8) 53 (2.1) 34 (1.4) 33 (1.3) 35 (1.4) 30 (1.2)
Average precipitation days (≥ 1 mm) 5 5 6 6 5 8 7 11 7 7 6 6

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

The sunniest months in Arniston are October, November and December, when the sun shines an average of 12 hours 37 minutes a day.Least sunny months in Arniston: May, June and July receive an average of 9 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Arniston, 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 327 349 344 308 291 268 286 306 324 365 383 413
Mean daily daylight hours 14h 9m 13h 19m 12h 15m 11h 10m 10h 17m 9h 51m 10h 4m 10h 51m 11h 52m 12h 58m 13h 55m 14h 25m

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

Arniston 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 Arniston UV Index data.

Average daily maximum UV levels by month for Arniston, 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 10 7 5 3 4 5 9 11 12 13