Hachijo Monthly Rainfall & Precipitation

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

Hachijo has a notably wet climate with abundant precipitation, recording 2300 mm (91 in) of rainfall per year. It does, however, have a distinct rainy season during certain months. Have a look at our detailed charts below to see how precipitation varies throughout the year.

Monthly Precipitation Levels

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

Hachijo can be quite wet during June, receiving approximately 323 mm (13 in) of precipitation over 19 rainy days.

In contrast August, experiences much drier conditions, with 116 mm (4.6 in) of rainfall, spread across 16 rainy days.

June, the wettest month, has a maximum daytime temperature of 25°C (77°F). The city receives 89 hours of sunshine in this period. During the driest month August you can expect a temperature of 29°C (84°F). For more detailed insights into the city's temperatures, visit our Hachijo Temperature page.

Hachijo's average annual precipitation is 2300 mm (91 in). Let's compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 620 mm (24 in), evenly distributed across the year with no extreme wet or dry seasons.

Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.

Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.

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.

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