Last updated: August 21, 2025
August in Hiroshima, Japan is characterized by a vibrant and humid climate, with temperatures soaring to a maximum of 36°C (97°F) and averaging around 27°C (81°F). While daytime heat grips the city, the nights offer a mild reprieve, with lows dipping to 17°C (63°F). This month also sees significant rainfall, totaling 257 mm (10.1 in) over approximately 14 days, creating a lush environment. The humidity levels peak at a tropical 93%, making it essential for visitors to stay hydrated and cool while exploring Hiroshima's rich history and culture.
August in Hiroshima, Japan, brings the peak of summer with warm and humid conditions. Temperatures typically range from a minimum of 17°C (63°F) to a scorching maximum of 36°C (97°F), averaging around 27°C (81°F). This month shows a noticeable rise compared to the milder July, where averages held steady at 26°C (78°F)—an indicator of the season's intensity. The warmth, while energizing, can sometimes lead to sultry days, emphasizing the need for hydration and relief from the heat. Overall, visitors can expect vibrant summer experiences amid the warmth, making August a lively time to explore the city's rich culture and history.
August in Hiroshima, Japan, showcases a significant dip in precipitation compared to the deluge of July, yet it still presents a robust total of 257 mm (10.1 in) over 14 days. While this marks a decrease from July's staggering 391 mm, it is notably higher than the typical summer totals, with August continuing the trend of being a particularly wet month in the region. This pattern highlights Hiroshima's climatic rhythm, where the summer months often deliver substantial rain, setting the stage for September’s 230 mm (9.1 in) of moisture. The consistent rainfall not only nourishes the lush greenery but also underscores the importance of preparation for those visiting during this vibrant, albeit rainy, time of year.
August in Hiroshima, Japan, showcases a noteworthy peak in humidity, reaching a robust 93%. This impressive figure follows July's staggering 95%, both marking the culmination of the summer months when the air is laden with moisture. Prior to this summer surge, the humidity fluctuated throughout the earlier months of the year, starting at a relatively comfortable 76% in January and gradually rising through April's 75% to May's substantial 84%. While the levels dip to 84% in September, the summer's oppressive humidity clearly shapes the overall climate, emphasizing Hiroshima's notable trend of increasing moisture as the seasons transition towards warmer weather.
In August, Hiroshima experiences a significant UV Index of 12, placing it in the extreme exposure category. With a burn time of just 10 minutes, the sun's intensity is nearly at its peak, mirroring the trends seen in July. This is a stark contrast to the cooler months where the UV Index drops distinctly, especially from January to March, where moderate to very high levels prevail. As summer peaks, the UV intensity remains a critical factor, demanding increased sun safety awareness. For those planning outdoor activities under the summer sun, being informed about the UV Index is essential. More details can be found at Hiroshima UV Index.
UV Risk Categories
August ushers in the sunniest stretch in Hiroshima, boasting an impressive 308 hours of sunshine. This peak follows a steady ascent from the winter months, where January's mere 184 hours feels like a distant memory. As spring blooms, the days grow brighter, culminating in the vibrant sunshine of August. Following this summer climax, the sunlight begins to wane, with September capturing 260 hours before descending into the cooler fall months. The gradual decrease in sunshine hours reflects nature's rhythms, inviting residents and visitors alike to savor the warmth and light of Hiroshima's summer days.
When considering the likelihood of sunny weather in August in Hiroshima, Japan, it’s notable that the chance of sun drops to a mere 25%, which aligns with a general trend of decreasing sunshine during the summer months. July sees the lowest probability at 22%, while August maintains a slight increase, but still remains below the average for earlier months like April (46%) and May (30%). As summer gives way to autumn, the chances significantly improve, with October surging to 56%. This pattern suggests that while August might not offer much in the way of sunshine, a brighter outlook lies just around the corner as the seasons change.
In Hiroshima, August marks a subtle transition in daylight duration, offering 13 hours of vibrant sunshine. The month stands out as part of a lively summer, paralleling the peak sunlight of June and July, which bask in 14 hours of daylight. As summer wanes, the days gradually shorten, paving the way for the approaching autumn, indicated by September's slight decline to 12 hours. This gradual transition reflects a yearly rhythm, where daylight peaks in the warmer months and gracefully recedes as temperatures cool, illustrating the beautiful dance of seasons in this historic city.
In Hiroshima during August, the average wind speed hovers around 2.4 m/s (5 mph), reflecting a gentle breeze that is typical for this time of year. As summer peaks, the winds exhibit a slight increase compared to the calmer months of June and July, which register lower speeds of 1.8 m/s (4 mph) and 2.0 m/s (4 mph), respectively. This trend continues into September, where the wind remains consistent at 2.1 m/s (5 mph), hinting at a gradual shift as the season transitions. Overall, while August's breeze provides a soothing backdrop against the warmth of the summer sun, it's also indicative of the region's subtle seasonal patterns, showcasing the interplay between temperature and wind dynamics throughout the year.
Weather in Hiroshima varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Hiroshima, focusing on differences in temperature, rainfall, humidity, and UV levels.
The weather in August is characterized by warm temperatures, with a minimum of 17°C (63°F) and average highs reaching up to 36°C (97°F), making it a hot and humid month with an average humidity of 93%. In contrast, January offers a starkly different climate, with temperatures ranging from a chilly -7°C (20°F) to a more moderate high of 14°C (58°F) and significantly less humidity at 76%. Precipitation levels also differ greatly, with August experiencing 257 mm (10.1 in) over 14 days compared to January’s 54 mm (2.1 in) over 9 days. For more detailed information about January weather, you can visit Hiroshima weather in January.
August and February present strikingly contrasting weather conditions. In August, temperatures soar, with daily averages around 27°C (81°F), peaking at a scorching 36°C (97°F), while February offers a much chillier experience, with average temperatures hovering around 5°C (41°F) and lows dipping to -7°C (19°F). August is characterized by high humidity at 93% and significant precipitation, totaling 257 mm (10.1 in) over 14 days, creating a muggy atmosphere. In contrast, February sees less rainfall at 67 mm (2.6 in) spread over just 9 days and lower humidity levels at 72%, resulting in a fresher, crisp environment. For more details on February weather, you can visit Hiroshima weather in February.
When comparing the weather in August and March, a stark contrast emerges. August features warmer temperatures, with minimums of 17°C (63°F) and maximums reaching up to 36°C (97°F), while March shows a much cooler range, starting from a low of -2°C (29°F) up to a high of 22°C (71°F). Additionally, August is characterized by high humidity levels at 93% and significant rainfall, averaging 257 mm (10.1 in) over 14 days, whereas March experiences lower humidity at 69% and less precipitation of about 120 mm (4.7 in) over 12 days. For more details on March weather, you can check Hiroshima weather in March.
August and April present significantly different weather patterns. In August, temperatures soar with a minimum of 17°C (63°F) and an average high of 27°C (81°F), reaching a maximum of 36°C (97°F). The month is also quite humid, with levels hitting 93% and experiencing heavy rainfall of 257 mm (10.1 in) over 14 days, making it one of the wettest months of the year. In contrast, April sees much cooler temperatures, starting from a minimum of -1°C (31°F) and averaging around 13°C (56°F), with highs peaking at 26°C (79°F). Precipitation is lighter, totaling 128 mm (5.0 in) over just 9 days, and the humidity is more moderate at 75%. For more detailed information, check out Hiroshima weather in April.
When comparing the weather in August and May, it's clear that August is significantly warmer and more humid. In August, temperatures range from a minimum of 17°C (63°F) to a maximum of 36°C (97°F) with an average of 27°C (81°F). In contrast, May experiences much cooler temperatures, with a minimum of 5°C (42°F) and a maximum of 30°C (86°F), averaging 18°C (65°F). Additionally, August sees higher precipitation levels of 257 mm (10.1 in) over 14 days, compared to May's 121 mm (4.8 in) over 9 days. The humidity in August peaks at 93%, which is noticeably higher than the 84% in May, creating a stark contrast in comfort levels. For more detailed information, check out Hiroshima weather in May.
When comparing the weather in August and June, it is evident that August experiences significantly higher temperatures, with an average of 27°C (81°F) and maximums reaching up to 36°C (97°F). In contrast, June is cooler, featuring an average temperature of 21°C (71°F) and maximums around 30°C (87°F). Both months see comparable precipitation, with August receiving 257 mm (10.1 in) and June 177 mm (7.0 in), yet August is notably more humid with a humidity level of 93%, compared to June's 88%. For more detailed insights, you can check Hiroshima weather in June.
In comparing the weather of August and July, we see that August features slightly warmer temperatures, with an average of 27°C (81°F), compared to July's average of 26°C (78°F). Both months have the same minimum temperature of 17°C (63°F), but August peaks at a maximum of 36°C (97°F), just above July's 35°C (96°F). While August experiences a notable decrease in precipitation levels, measuring 257 mm (10.1 in) over 14 days, July sees significantly more rain at 391 mm (15.4 in) over 19 days. Humidity remains high in both months, with August slightly lower at 93% compared to July's 95%. For more detailed information, you can check Hiroshima weather in July.
August and September exhibit significant contrasts in weather patterns. In August, temperatures soar with minimums of 17°C (63°F) and maximums reaching 36°C (97°F), while September offers a cooler range with minimums of 12°C (54°F) and maximums of 33°C (92°F). Both months experience a similar number of rainy days, but August sees higher precipitation levels at 257 mm (10.1 in) compared to September’s 230 mm (9.1 in). Humidity is also higher in August at 93%, while September maintains a more comfortable 84%. For those interested in more specifics, you can check out Hiroshima weather in September.
August and October present a stark contrast in weather. August boasts higher temperatures, with a minimum of 17°C (63°F) and an average of 27°C (81°F), reaching up to a scorching 36°C (97°F). This month also experiences significant rainfall, averaging 257 mm (10.1 in) over 14 days, coupled with high humidity levels at 93%. In contrast, October offers a much cooler climate, with temperatures ranging from a minimum of 5°C (41°F) to a mild average of 17°C (63°F), peaking at 28°C (84°F). Precipitation is also reduced in October, totaling 164 mm (6.5 in) over 11 days, and the humidity drops to 79%. For more information, check out Hiroshima weather in October.
August and November present contrasting weather patterns. In August, temperatures soar with a minimum of 17°C (63°F), averaging 27°C (81°F), and peaking at a scorching 36°C (97°F). This month is also characterized by high humidity levels at 93% and frequent rain, accumulating 257 mm (10.1 in) over about 14 days. In stark contrast, November experiences much cooler temperatures, ranging from a minimum of -1°C (31°F) to a mild maximum of 23°C (75°F), with an average of 11°C (52°F). Precipitation drops significantly to just 39 mm (1.5 in) over 5 days, and humidity decreases to 76%. For more detailed insights, check Hiroshima weather in November.
August and December present stark contrasts in weather conditions. In August, temperatures soar, with minimums averaging 17°C (63°F) and highs reaching up to 36°C (97°F), accompanied by high humidity levels at 93% and significant rainfall totaling 257 mm (10.1 in) over an average of 14 days. In contrast, December brings a chillier climate, with temperatures dipping as low as -2°C (28°F) and averaging around 6°C (43°F). Precipitation decreases to 66 mm (2.6 in) over about 10 days, and humidity levels drop to a more comfortable 75%. For more specific details about December weather, you can refer to Hiroshima weather in December.
In August, Hiroshima experiences its most intense weather of the year, characterized by high temperatures and significant humidity levels. The city basks in warm days with average highs soaring, while nights remain relatively mild. Unlike other months, August is particularly marked by frequent rainfall, with nearly half the month seeing precipitation, contributing to an overall humidity that can reach a muggy 93%. This combination of heat and moisture sets August apart, creating a sultry atmosphere that is both vibrant and challenging. For those curious about how Hiroshima's climate evolves throughout the year, detailed information can be found here: Hiroshima Climate.