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Monthly climate in Heidelberg, Gauteng, South Africa

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Heidelberg features a subtropical climate (Cwb).Temperatures typically range between 10 °C (51 °F) and 21 °C (69 °F) through the year, but rarely can drop to -4 °C (24 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 738 mm (29.1 inches) and receives 87 rainy days on the 1 mm (0.04 inches) threshold annually.Heidelberg enjoys an average of 3987 hours of sunshine throughout the year, and daylight varies from 10 hours 29 minutes to 13 hours 45 minutes per day.

Monthly average temperatures in Heidelberg, Gauteng, South Africa §

The warmest months in Heidelberg are January, February and December, with daily mean temperatures ranging from 20 to 21 °C (69 - 69 °F) throughout the day. The coldest temperatures usually occur in May, June and July, when daily mean temperatures range from 10 to 13 °C (51 - 56 °F) throughout the day. On average each year, Heidelberg experiences 136 days above 25 °C (77.0 °F) and 5 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Heidelberg, Gauteng, 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 33°C
(91°F)		 31°C
(88°F)		 30°C
(87°F)		 30°C
(86°F)		 26°C
(79°F)		 25°C
(78°F)		 26°C
(79°F)		 28°C
(82°F)		 33°C
(91°F)		 33°C
(92°F)		 34°C
(94°F)		 34°C
(93°F)
Mean maximum 30°C
(87°F)		 30°C
(85°F)		 29°C
(84°F)		 28°C
(82°F)		 24°C
(76°F)		 22°C
(73°F)		 24°C
(75°F)		 26°C
(80°F)		 31°C
(89°F)		 32°C
(90°F)		 33°C
(91°F)		 31°C
(89°F)
Average high 26°C
(79°F)		 26°C
(78°F)		 25°C
(78°F)		 23°C
(73°F)		 21°C
(70°F)		 19°C
(67°F)		 19°C
(66°F)		 22°C
(72°F)		 26°C
(79°F)		 26°C
(79°F)		 27°C
(81°F)		 26°C
(79°F)
Daily mean 21°C
(69°F)		 20°C
(69°F)		 19°C
(67°F)		 16°C
(62°F)		 13°C
(56°F)		 11°C
(51°F)		 10°C
(51°F)		 14°C
(57°F)		 18°C
(64°F)		 19°C
(66°F)		 20°C
(69°F)		 20°C
(69°F)
Average low 16°C
(60°F)		 15°C
(60°F)		 14°C
(57°F)		 11°C
(52°F)		 7°C
(45°F)		 4°C
(39°F)		 3°C
(38°F)		 7°C
(44°F)		 10°C
(50°F)		 12°C
(54°F)		 14°C
(57°F)		 15°C
(60°F)
Mean minimum 11°C
(53°F)		 12°C
(54°F)		 10°C
(50°F)		 6°C
(43°F)		 3°C
(37°F)		 -1°C
(30°F)		 -2°C
(28°F)		 0°C
(32°F)		 3°C
(37°F)		 6°C
(44°F)		 8°C
(47°F)		 11°C
(52°F)
Minimum 9°C
(48°F)		 10°C
(51°F)		 8°C
(46°F)		 2°C
(36°F)		 -1°C
(31°F)		 -3°C
(26°F)		 -4°C
(24°F)		 -2°C
(29°F)		 -0°C
(32°F)		 4°C
(40°F)		 4°C
(39°F)		 10°C
(50°F)

Compare climate in Heidelberg with other places

Compare temperature, precipitation, sunshine, UV index in Heidelberg, Gauteng, South Africa with other places around the world.

Monthly average precipitation in Heidelberg, Gauteng, South Africa §

Heidelberg usually has the most precipitation in January, February and December, with an average of 15 rainy days and 134 mm (5.3 inches) of precipitation per month.The driest months in Heidelberg are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Heidelberg, Gauteng, 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) 121 (4.8) 126 (5.0) 72 (2.8) 60 (2.4) 14 (0.5) 5 (0.2) 2 (0.1) 2 (0.1) 9 (0.4) 66 (2.6) 106 (4.2) 156 (6.1)
Average precipitation days (≥ 1 mm) 14 15 9 9 1 0 0 0 2 7 12 18

Monthly sunshine hours in Heidelberg, Gauteng, South Africa §

The sunniest months in Heidelberg are October, November and December, when the sun shines an average of 11 hours 56 minutes a day.Least sunny months in Heidelberg: January, June and July receive an average of 10 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Heidelberg, Gauteng, 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 308 315 352 315 317 297 315 329 336 361 368 369
Mean daily daylight hours 13h 34m 12h 58m 12h 12m 11h 25m 10h 47m 10h 29m 10h 38m 11h 12m 11h 56m 12h 43m 13h 24m 13h 45m

Solar UV radiation in Heidelberg, Gauteng, South Africa §

Heidelberg experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure.May, June and July are in the High exposure category. In these months, the maximum values of the UV index do not exceed 7. For more detailed information, check out our hourly Heidelberg UV Index data.

Average daily maximum UV levels by month for Heidelberg, Gauteng, 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) 15 15 13 10 7 6 6 9 11 12 14 16