Heidelberg Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Heidelberg, Western Cape, South Africa. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Now, let's break down all the details for a clearer picture.
Heidelberg maintains relatively dry conditions year-round, with an average annual precipitation of 465 mm (18 in). However, it does have a distinct dry season during certain months, creating distinct seasonal patterns visible in our monthly breakdown below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Despite minor fluctuations, Heidelberg enjoys fairly consistent precipitation throughout the year. In November, you can expect around 49 mm (1.9 in) of precipitation, while in September, Heidelberg receives about 31 mm (1.2 in).
November, the wettest month, has a maximum daytime temperature of 25°C (77°F). During the driest month September you can expect a temperature of 21°C (70°F). For more detailed insights into the city's temperatures, visit our Heidelberg Temperature page.
Annual Rainfall in South Africa: City Comparison
The map below shows the annual precipitation across South Africa. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Heidelberg vs World: Rainfall Compared
Heidelberg's average annual precipitation is 465 mm (18 in). Let's compare this to some popular worldwide tourist destinations:
In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.
Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.
Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.
Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
Climate change is affecting precipitation patterns worldwide, including Heidelberg:
- Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
- Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.
- "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
- The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
- The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters (103 feet) fell during the winter of 1972.
For more detailed information about Heidelberg's weather, including sunshine hours, humidity levels, and temperature data, visit our Heidelberg Climate page.
