Perth Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Perth, Tayside, United Kingdom. This average is based on long-term data collected between 1990 and 2020. Let's explore the details to provide you with a complete overview.

Perth has a relatively rain/snowy climate with high precipitation levels, averaging 1033 mm (41 in) of rain/snowfall annually.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

Precipitation levels in Perth remain relatively steady throughout the year. October has the most rain, with 103 mm (4.1 in) over 18 days. In April, this drops slightly to 71 mm (2.8 in), making the city's climate fairly predictable.

October, the wettest month, has a maximum daytime temperature of 13°C (55°F). The city receives 94 hours of sunshine in this period. During the driest month April you can expect a temperature of 12°C (54°F). For more detailed insights into the city's temperatures, visit our Perth Temperature page.

Perth's average annual precipitation is 1033 mm (41 in). Let's compare this to some popular worldwide tourist destinations:

Chicago, USA, sees an annual precipitation of 1062 mm (42 in), with rain and snow contributing to its humid climate.

In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.

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.

Precipitation has a very strong role in determining the local climate and ecosystem:

• 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.

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
• Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.

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