Historical weather data, all-time temperature records, and monthly climate averages for Hiroshima, Hiroshima, Japan. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Hiroshima typically lands right in the heart of spring, with average highs around 62° and lows near 44°. There's still a small 5% chance of snow — rare, but not unheard of, as 2022 proved when temperatures dipped to 33°. On the flip side, a warm spring day like 1994's 73° is well within reach.
Hiroshima swings hard between seasons — the all-time high of 101° set just last summer on August 2nd, 2025, stands in stark contrast to the bone-chilling 16° recorded on February 26th, 1968. The city also saw a brutal 8.31 inches of rain in a single day in July 2018, a reminder of how intense the rainy season can get.
Hiroshima is warmest in late summer, peaking around the week of July 30–August 5 with average highs of 87°, while late January through early February is the coldest stretch at just 45°. Timing matters for rain too — late June through early July is the wettest stretch, averaging over 3 inches in a week, so travelers looking for dry weather are better off in spring or autumn.