Hiroshima Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Hiroshima, Hiroshima, Japan. 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.

Hiroshima has a notably wet climate with abundant precipitation, recording 1650 mm (65 in) of rain/snowfall per year.

Monthly Precipitation Levels

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

The seasons in Hiroshima, bring significant changes in precipitation. The wettest month, July, receives heavy rainfall, with an average of 247 mm (9.7 in) of precipitation. This rainfall is distributed across 17 rainy days.

In contrast, the driest month, January, experiences much less rainfall, totaling 63 mm (2.5 in) over 18 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

July, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 177 hours of sunshine in this period. During the driest month January you can expect a temperature of 9°C (48°F). For more detailed insights into the city's temperatures, visit our Hiroshima Temperature page.

Annual Rainfall in Japan: City Comparison

The map below shows the annual precipitation across Japan. You can also select the different months in case you are interested in a specific month.

Hiroshima vs World: Rainfall Compared

Hiroshima's average annual precipitation is 1650 mm (65 in). Let's compare this to some popular worldwide tourist destinations:

In Toronto, Canada, annual precipitation averages 964 mm (38 in), with snowy winters and rainy summers.

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.

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.

Climate change is affecting precipitation patterns worldwide, including Hiroshima:

• 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.

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