Osaka Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Osaka, Osaka Prefecture, Japan. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Let's explore the details to provide you with a complete overview.

Osaka is known for its substantial rain/snowfall, with annual precipitation reaching 1507 mm (59 in).

Monthly Precipitation Levels

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

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, June receives substantial rainfall, averaging 207 mm (8.1 in) of precipitation, recorded across 18 rainy days.

In contrast, the driest month, January brings less rainfall, with 64 mm (2.5 in) over 18 rainy days.

June, the wettest month, has a maximum daytime temperature of 28°C (82°F). The city receives 156 hours of sunshine in this period. During the driest month January you can expect a temperature of 10°C (50°F). For more detailed insights into the city's temperatures, visit our Osaka Temperature page.

Osaka's average annual precipitation is 1507 mm (59 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.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm (60 in), with significant summer rains due to typhoon season.

Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

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.

• "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 Osaka's weather, including sunshine hours, humidity levels, and temperature data, visit our Osaka Climate page.