Swellendam Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Swellendam. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s explore all the details to give you a full picture.

Swellendam maintains relatively dry conditions year-round, recording average annual precipitation of 422 mm.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

Year-round, Swellendam has a balanced climate with minimal variation in precipitation. The difference between the wettest month, November, with 43 mm, and the driest month, September, with 28 mm, is minimal.

November, the city’s wettest month, has a maximum daytime temperature of 27°C. During the driest month September you can expect a temperature of 22°C. For more detailed insights into the city’s temperatures, visit our Swellendam Temperature page.

Annual Precipitation in South Africa

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.

Amsterdam Precipitation Compared World Wide

Swellendam’s average annual precipitation is 422 mm. Let’s compare this to some popular worldwide tourist destinations:

The city of Rome, Italy, has an average annual precipitation of 832 mm, spread fairly evenly throughout the year.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm of annual rainfall, mostly in the summer.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Singapore, situated near the equator, gets 2581 mm of rainfall annually, with no distinct dry season and consistent monthly precipitation.

How is Precipitation Measured?

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.

Interesting weather facts

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Swellendam’s weather, including sunshine hours, humidity levels, and temperature data, visit our Swellendam Climate page.