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In terms of precipitation, rainfall in Hiroshima ranges from 1.6 - 9.8 inches per month. June is typically the wettest month, when rainfall can reach 9.8 in. January is typically the driest time to visit Hiroshima when rainfall is around 1.6 in.
If weather is an important factor for your trip to Hiroshima, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).